View allAll Photos Tagged zeolite
Scolecite (055)
2.1x1.5 inch
Nasik quarry, Nasik, Pashan, Pune (Poonah), Maharashtra, India.
Scolecite is a delicate, needle-like zeolite mineral (hydrated calcium aluminum silicate) known for its calming energy, forming in basalt cavities and often found with other zeolites like Apophyllite.
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This is Okenite, from Bombay, India. Aprox. 4cm
Okenite (CaSi2O. 5· 2H2O) is a silicate mineral that is usually associated with zeolites. It most commonly is found as small white "cotton ball" formations within basalt geodes. These formations are clusters of straight, radiating, fibrous crystals that are both bendable and fragile.
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8/5 sec. f/20 55mm ISO100
One from my mineral collection is this Natrolite. Natrolite is a tectosilicate mineral species belonging to the zeolite group. It is a hydrated sodium and aluminium silicate with the formula Na2Al2Si3O10 · 2H2O.
Needle stone or needle-zeolite are other informal names, alluding to the common acicular habit of the crystals, which are often very slender and are aggregated in divergent tufts. The crystals are frequently epitaxial overgrowths of natrolite, mesolite, and gonnardite in various orders.
(Information courtesy of Wikipedia)
The Berufjörður is a fjord in eastern Iceland, and belongs to the East Fjords. At the entrance to the fjord is the town of Djúpivogur, and from there the fjord stretches about 35 kilometres north-west into the country. The many shallows make the fjord virtually unnavigable for most boats.
On the western side of the fjord is the 900-metre-high striking pyramid-shaped mountain Búlandstindur. Near this mountain, on the coast of the fjord is Teigarhorn. A lot of calcite is found near this place, but other minerals and zeolites are also found here. Teigarhorn used to be freely accessible, but has been closed to the public for some time.
The Hringvegur leads along the fjord. At the end of the fjord, the 19-kilometre-long Axarvegur (or Öxi) branches off the ring road, leading up the Breiðdalsheiði plateau. This pass shortens the road to Egilsstaðir by about 60 kilometres. A few kilometres south, the Fossá flows into the sea via the Fossárfoss.
The photo was taken from the gravel (unpaved) road Axarvegur and overlooks the vastness of the fjord. The sun was almost behind us and gave a magnificent lumination of the landscape.
Northern Fulmars (Fulmarus glacialis) catch updrafts blowing across the spits of land jutting into Berufjörður along the eastern fjords of Iceland. Fulmars resemble gulls but are in a different family altogether. They spend most of their lives in the open ocean, but nest on shore typically on cliffs. Fulmars produce an oil in their stomachs which they can spray out of their bills at avian predators, which can coat their feathers and inhibit their ability to fly. The same substance is also used to feed their young.
There are a few tiny dots in the sky which are other fulmars or gulls in the distance. I think every picture I took in Iceland had gulls or fulmars flying somewhere in the frame.
Note the tilt in the rock layers on the mountains across the fjord, which the geologic guide to Iceland indicates is a product of isostatic rebound, that is uplifting of the coast when the Pleistocene glaciers retreated. Note also the two humanoids in the foreground, looking for zeolite crystals which this area is known for.
Handle with Care. Fragile Scolecite is a tectosilicate mineral belonging to the zeolite group; it is a hydrated calcium silicate, CaAl2Si3O10·3H2O.
Scolecite (058)
3x1.5x1.1 inch
Nasik quarry, Nasik, Pashan, Pune (Poonah), Maharashtra, India.
Scolecite is a delicate, needle-like zeolite mineral (hydrated calcium aluminum silicate) known for its calming energy, forming in basalt cavities and often found with other zeolites like Apophyllite.
Data from the CRISM instrument shows a localized, unique spectral phase consistent with polyhydrated sulfate or zeolite here on the Mawrth Vallis channel floor, with implications for the regional history. We want to look for potential textural differences between new hydrated mineral and adjacent clays.
Image cutout is less than 1 km (under a mile) top to bottom and the spacecraft altitude was 285 km (177 mi) and north is to the right. For full observation details including images with scale bars, visit the source link.
www.uahirise.org/ESP_022578_2030
NASA/JPL-Caltech/Arizona
Deutschland - Baden-Württemberg - Kaiserstuhl
Schelinger Matten
The Kaiserstuhl (German: [ˈkaɪzɐʃtuːl], lit. "Emperor’s Chair") is a range of hills in the state of Baden-Württemberg in southwest Germany with a maximum height of 556.6 metres (1,826 ft). It is of volcanic origin and located in the southwest of the state in the counties of Emmendingen and Breisgau-Hochschwarzwald. In terms of natural regions it is considered to be a part of the Upper Rhine Plain.
Name
The name "Kaiserstuhl" is believed to refer to King Otto III, who held court near Sasbach on 22 December 994. From then on, the whole hill range was called the Königsstuhl – the King’s Chair. In May 996, Otto III was crowned Emperor and the King’s Chair eventually became the Emperor’s Chair – "Kaiserstuhl". Reliable sources mention the name Kaiserstuhl only as early as 1304 and historians thus suppose that the term Kaiserstuhl was not coined until the 13th century.
Geography
Location
The Kaiserstuhl is situated in South Baden, mainly in Breisgau-Hochschwarzwald county or district. However, the smaller northern part belongs to Emmendingen. Within the Upper Rhine Plain it is situated about 16 km northwest of the city of Freiburg, right next to the eastern bank of the Rhine and a short distance west of the Dreisam. It reaches up to 377 metres above the level of the Rhine downstream (179.5 m a.s.l.) from the weir close to Burkheim.
At its greatest extent, from the Michaelsberg near Riegel in the northeast, to the Fohrenberg, by Ihringen in the southwest, the Kaiserstuhl is about 15 km long. Its maximum width is about 12.5 km.
Hills
The hills of the Kaiserstuhl include the following (sorted by height in metres above sea level):
Totenkopf (556.6 m), 1.9 km east of Bickensohl; with the Vogtsburg 1 telecommunication tower and Neunlinden observation tower
Eichelspitze (521.3 m), 2.8 km northwest of Bötzingen
Katharinenberg (492.4 m), 1.3 km southeast of Amoltern
Bisamberg (469.0 m), 1.2 km south of Amoltern
Staffelberg (446.0 m), 1.5 km northwest of Schelingen
Badberg (432.7 m) (protected area), 1.5 km east of Oberbergen
Holzeck (431.9 m), 1.7 km northeast of Ihringen; with tower
Hochbuck (374.8 m), 900 m south of Achkarren
Schlossberg (352.1 m), 500 m northwest of Achkarren; with Höhingen Castle ruins
Böselsberg (340.1 m), 500 m northwest of Wasenweiler
Büchsenberg (283.7 m), 1.3 km west of Achkarren
Geology
The formation of the Kaiserstuhl volcano during the Tertiary was the climax and at the same time the end of volcanic activity in the Upper Rhine Valley Rift. Volcanism started as early as the Cretaceous Period. Volcanic landforms include heavily eroded volcanic vents. The Kaiserstuhl is the only larger volcano from this period in the rift valley. Geologically the Kaiserstuhl can be divided into two parts: the sedimentary and volcanic part. Due to these peculiarities the Kaiserstuhl has been labeled one of the most important national geotopes.
Sedimentary base
The horizontal sedimentary layers forming the eastern third of the Kaiserstuhl date back to the Jurassic and the Tertiary long before the volcanic activity. Important stratigraphic outcrops include the Hauptrogenstein (local oolite) which is found mainly near the village of Riegel and the Pechelbronner Schichten (local Tertiary layers in the South German Scarplands) near Bötzingen. During the formation of the Upper Rhine Plain this part of the Kaiserstuhl sloped less in respect to its surrounding area – and thus appears as a so-called horst. In terms of its geological structure and the sequence of its escarpments, the Kaiserstuhl is comparable to the nearby Tuniberg, Nimberg and also to the Schönberg, which is situated south of the city of Freiburg.
Volcanic activity
Petrologically the volcanic Kaiserstuhl is an alkali-carbonate rock formation. The volcanic rocks making up a large part of the central and western Kaiserstuhl were the result of numerous volcanic eruptions during the Miocene, about 19 to 16 million years ago. They cover parts of the sedimentary base of the eastern Kaiserstuhl, which is why in some places changes in the base’s mineralogical composition occurred. The driving force behind this process of contact metamorphism was an increase in temperature. Due to the alternate eruption of tephra and lava flows from several vents a complex stratovolcano came into existence. Some of the rising magma solidified as volcanic intrusions below the surface – and today forms the central part of the Kaiserstuhl. Laterally rising phonolite magma also intruded into the sedimentary base of the Eastern Kaiserstuhl. Several hundred metres of the original volcano have been eroded.
Volcanic rocks
The entire volcanic Kaiserstuhl consists of rock types that contain feldspathoid minerals and olivine and are undersaturated with SiO2. Most igneous rocks at the surface are leucite-tephrites, with subordinate phonolites, limburgites, and olivine-nephelinites (at the Limberg Mountain near Sasbach), the last of which is rich in xenoliths from the Earth’s mantle. Carbonatite ignimbrite and lapilli are local peculiarities; they can be found in places in the western part of the Kaiserstuhl (Henkenberg near Burkheim, Kirchberg near Oberrotweil).
The subvolcanic and intrusive rocks of the central Kaiserstuhl are plutonic equivalents of the erupted material (essexite, carbonatite and coarse-granular phonolite). Several local terms which do not carry official status with the International Union of Geological Sciences have been used for different varieties of the intrusive rocks. Of major scientific interest is the consolidated carbonatite near Altvogtsburg und Schelingen. It is a quite rare volcanic rock, which crystallized from a carbonate magmatic melt rather than a silicate one. Given its unusual composition for an igneous rock, the magmatic nature of the carbonatite was not proposed for a long time and remained doubtful subsequently. An alternative interpretation was that it was a metamorphically altered sedimentary rock, examples of which can be found nearby. Only in the 1950s and 1960s did research prove that it was a carbonatite; one of the clues was identification of the eruptive carbonatites found in the western part of the Kaiserstuhl. The carbonatite contains the niobium rich pyrochlore; attempts to mine the carbonatite rock for niobium were carried out in the middle of the 20th century, but the amount turned out to be too small to be economical.
Minerals
For a long time the Kaiserstuhl has been known for rare minerals. Examples include the quarries at the Limberg (zeolites), Badberg (carbonatites), Orberg and Fohberg. Well-crystallized minerals can be found predominantly in clefts or cavities in the volcanic rock.
Loess
The Kaiserstuhl is today largely covered by a Quaternary loess layer, a loosely cemented sediment. It is derived from other rocks through erosion and is then transported by the wind. The loess at the Kaiserstuhl – as in all the peripheral areas of the Upper Rhine Valley – was formed during the last Ice Age. Large parts were bare of vegetation and so loess was winnowed out from the Rhine sediments. It was then deposited in the periglacial area (i.e. ice-free, but surrounded by glaciers) at the Kaiserstuhl. The major process active here was frost weathering resulting in crushed rocks. The wind blew strongly, as there was no vegetation that could have moderated it – entraining the lightest material and depositing it at obstacles like the Kaiserstuhl. Deposition took place northeast of the Kaiserstuhl, as the winds blew from the southwest.
The higher the place of sedimentation, the thinner the layer of the sedimented material is. At the Kaiserstuhl the thickness of the loess layer varies between 10 and 40 metres. There are, however, also areas in the southwest where no loess has been deposited. The Northern Limestone Alps are considered the main source of the Kaiserstuhl loess. A rust-coloured band occurs at irregular intervals. It developed as a new material and did not arrive regularly but in phases of different intensities. In a phase of weak sedimentation the material on top weathered – and the calcium carbonate was washed out. It then precipitated further down and formed a particular type of soil horizon, which contains concretions of calcium carbonate.
The Kaiserstuhl loess soils are used for intensive farming, as they offer good aeration, high water storage capacities and good mechanical qualities. Besides, as a result of farming deep narrow ravine-like paths developed.
As the loess developed over time it is, furthermore, significant for flood control. Sponge-like, it absorbs and then gently releases rainfall. This quality is however lost when bulldozers, employed to construct large terraces for viticulture, compress the loess.
Climate
General
The Kaiserstuhl is one of the warmest regions in Germany. The winters are relatively mild for the area, and the summers are warm or even hot, with possible average temperatures of over 20 °C (68 °F) in July and August. Because of its loess covered volcanic soils it is a very good wine-producing region. The climatic situation of the Kaiserstuhl is outstanding in the area. It is rain-shadowed by the Vosges Mountains, under the climatic influence of the Belfort Gap and is characterized by a drier and hotter climate, which one would rather expect not to be typical of the area. Despite this, winters remain cold and dry, and summers wet, in comparison with Mediterranean climate (which instead has a rainfall peak during winter, which can see few frost days, and a dry season in summer).
Meteorological data
The average annual temperature is 9.9 °C (49.8 °F), with 50–60 days with a maximum temperature above 25 °C (77 °F) as well as 60–70 days with a minimum temperature below 0 °C (32 °F). This illustrates a special feature of the Kaiserstuhl: it is characterized by its relatively extreme climate. The average difference between the lowest and the highest average temperatures within one year is 18.5 °C (65.3 °F). The mean precipitation at the Kaiserstuhl is approximately 600–700 millimetres (24–28 in), with about 1,720 hours of sunshine per year.
Flora and fauna
The climate of the Kaiserstuhl also explains the vast richness of thermophile flora and fauna. The Kaiserstuhl is for example one of the places with the largest variety of orchids in Europe – more than 30 species have been recorded. Among the vines wild grape hyacinths sprawl and along acclivities iris plants blossom. Furthermore, sand lizards (lacerta bilineata) and praying mantis (Mantis religiosa) live here – species which mainly occur in the Mediterranean area. (However, according to the latest research results the sand lizard presumably belongs to the allochthonous species of the European green lizard (Lacerta viridis)). The pubescent oak (Quercus pubescens) is a Xerophyte and normally only occurs in Southern Europe, but is also able to survive at the Kaiserstuhl. This species has a disjunct distribution, which means away from its normal habitat. It is a relict of a postglacial warm period where there had been a much warmer climate around the Kaiserstuhl. After the end of the warm period only the named species were able to survive. Besides there is a larger population of the May beetle (Melolontha melolontha). In spite of protests from conservationists the May Beetle is controlled by the use of insecticides.
Changes in landscape
The terrain of the Kaiserstuhl has been altered by the people living there since it was settled. The loam there is strongly susceptible to erosion as a result of soil cultivation, thus terraces had to be added, which were then mostly used as vineyards, as well as fruit growing or for other agricultural uses. As a result, the typical small "patio" hillsides and the streaked loess sunken roads typical of the region came into being.
To start with, it was for this reason that smaller terraces were merged in around 1950, this resulted in large scale reallocation, which turned parts of the original landscape completely upside down.
The phases of this reallocation were:-
Small-scale realignment between 1950 and 1960. At the same time the terrain was generally modified by manual labour with the help of in-house machines. During this time approximately 950 hectares were enclosed by the farmland consolidation authority.
Between 1960 and 1970 the loess slopes were more comprehensively modified, whereby large rectangular terraced areas with corresponding high embankments were made. The terraces were arranged with mountain like slopes so that now only the multiple slope edges are visible from the valley. About 650 hectares of the surface were styled in this way.
The plans to create large-scale terraces made between 1970 and 1976 were executed with the help of heavy machinery, changing the landscape radically. Before the original, naturally formed, depressions had still been visible in the gentle hillsides with only small terraces. Natural and man-made structures existed side by side. However, these small-scale structures were then obliterated completely. Monstrous areas resembling fortresses and entirely incongruous to the region were created. The total wine-growing area of the terraces was 630 ha. As the embankments and other areas exceeded the size of the wine-growing areas, the changes affected more than twice the newly created arable area. The land reforms of Oberrotweil-Oberberg, Ihringen-Abtsweingarten, Eichstetten-Hättlinsberg and Endingen am Kaiserstuhl-Schambach are examples of this phase.
The last phase of wine-growing land reforms was realized between 1976 and 1982. Due, in part, to protests against plans for further large scale terraces the changes were not as radical as the previous phase: the maximum height for embankments was "limited" to 10 m and their shapes were "made smooth and adjusted to the landscape" (Mayer 1986, citation translated). This procedure was, for example, applied to about 330 ha of wine-growing area in Oberbergen-Baßgeige or in Bickensohl-Herrenstück.
From 1977 on, several longer periods of enhanced precipitation caused damage to the embankments. During one week in May 1983 for example, the amount of precipitation was so large that in some areas it was equivalent to one third of the annual average, causing great damage in the modified areas.
The surfaces of the acclivities often slid off together with the vegetation. Former valleys, which had been blocked due to re-allocation, were flushed out. In some terraces dramatic shear failures developed. In addition extensive, devastating frost damage occurred; due to the incline of the mountainside at the surfaces of the acclivities, cold air pockets were formed in which the vines in bloom were frostbitten. Additionally substantial frost damage occurred in the woody part of the vines, especially in the vineyards which were situated in lower regions. In earlier times fruit had mostly been grown here but later this was changed to vineyards.
The activity of the farmland consolidation authority was narrowed to repairing and partly to rescheduling which at least was meant to correct the most severe consequences of the transformations from 1982 on.
Hiking
There are many opportunities for hiking in the Kaiserstuhl. The best known trail is the North-South Trail (check mark: blue rhomb on yellow background) from Endingen across the Katharinenberg and the Totenkopf and the Neunlinden viewing point to Ihringen. From the trail there are panoramic views over the Black Forest, the Upper Rhine Valley and the Vosges.
(Wikipedia)
Der Kaiserstuhl ist ein bis 556,8 m ü. NHN hohes, kleines Mittelgebirge vulkanischen Ursprungs in der Oberrheinischen Tiefebene. Es erhebt sich im Südwesten von Baden-Württemberg (Deutschland), in den Landkreisen Emmendingen und Breisgau-Hochschwarzwald.
Namensdeutung
Seinen Namen hat der Kaiserstuhl vermutlich von König Otto III., der bei Sasbach am 22. Dezember 994 einen Gerichtstag abhielt. Nach diesem Gerichtstag wurde das ganze Gebirge als „Königsstuhl“ bezeichnet. Nachdem Otto III. im Mai 996 zum Kaiser gekrönt worden war, wurde aus dem „Königsstuhl“ der „Kaiserstuhl“. Nachweislich belegt ist die Bezeichnung „Kaiserstuhl“ erst seit 1304. Historiker vermuten, dass der Begriff „Kaiserstuhl“ nicht vor dem 13. Jahrhundert entstand.
Geographie
Lage
Naturräumlich wird der Kaiserstuhl zum Oberrheinischen Tiefland gezählt und stellt dort die Haupteinheit 203 dar. Er befindet sich in Südbaden zum Großteil im Landkreis Breisgau-Hochschwarzwald, der kleine Nordteil gehört zum Landkreis Emmendingen. Innerhalb der Oberrheinischen Tiefebene liegt er etwa 16 km nordwestlich der Großstadt Freiburg, direkt östlich des Rheins und etwas westlich der Dreisam. Er erhebt sich maximal 377,1 m über den Rhein unterhalb (179,5 m) des Stauwehrs bei Burkheim.
In seiner weitesten Ausdehnung vom Michaelsberg bei Riegel im Nordosten bis zum Fohrenberg bei Ihringen im Südwesten ist der Kaiserstuhl rund 15 km lang, seine größte Breite beträgt etwa 12,5 km.
Berge
Zu den Bergen, Erhebungen und deren Ausläufern des Kaiserstuhls gehören – sortiert nach Höhe in Meter (m) über Normalhöhennull[1]:
Totenkopf (556,8 m), 1,9 km östlich von Bickensohl; mit Fernmeldeturm Vogtsburg-Totenkopf und Aussichtsturm Neunlinden
Eichelspitze (521,3 m), 2,8 km nordwestlich von Bötzingen mit dem Eichelspitzturm
Katharinenberg (491,9 m), 1,3 km südsüdöstlich von Amoltern
Bisamberg (469,6 m), 1,2 km südlich von Amoltern
Staffelberg (447,6 m), 1,5 km nordnordwestlich von Schelingen
Badberg (432,7 m) (Naturschutzgebiet), 1,5 km östlich von Oberbergen
Holzeck (431,9 m), 1,7 km nordnordöstlich von Ihringen; mit Sendeturm
Hochbuck (375,2 m), 900 m südlich von Achkarren
Schlossberg (351,9 m), 500 m nordwestlich von Achkarren; mit Burgruine Höhingen
Böselsberg (340,1 m), 500 m nordwestlich von Wasenweiler
Hochberg, (288,7 m), 900 m nordöstlich von Jechtingen
Büchsenberg (283,7 m), 1,3 km westlich von Achkarren
Geologie
Die Entstehung des Kaiserstuhlvulkans im Tertiär stellt sowohl den Höhepunkt als auch den Schlusspunkt der vulkanischen Aktivität im Oberrheingraben dar. Diese begann schon in der Kreidezeit und zeigt sich in zahlreichen, heute tief erodierten Vulkanschloten. Der Kaiserstuhl ist der einzige größere Vulkan aus dieser Zeit im Bereich des Oberrheingrabens. Dieser trifft hier auf den Bonndorfer Graben, der über den Hegau zum Bodensee führt. Gegen Ende des Oligozäns drang Magma empor, erstarrte jedoch noch unter der Erdoberfläche. Erst im Miozän kam es zu einem Durchbruch und zu großflächigen Lavaströmen. Geologisch gesehen lässt sich der Kaiserstuhl in einen sedimentären und einen vulkanischen Teil gliedern. Aufgrund dieser Besonderheiten wurde der Kaiserstuhl als eines der bedeutendsten nationalen Geotope Deutschlands ausgezeichnet.
Sedimentärer Sockel
Die das östliche Drittel bildenden, nahezu horizontal lagernden Sedimentgesteine wurden lange vor der vulkanischen Aktivität zu Zeiten des Juras und Tertiärs gebildet. Wichtige aufgeschlossene stratigraphische Einheiten sind der Hauptrogenstein (hauptsächlich in Riegel) und die Pechelbronner Schichten (in der Gegend von Bötzingen). Dieser Teil des Kaiserstuhls wurde während der Entstehung des Oberrheingrabens weniger stark als seine Umgebung abgesenkt und stellt einen sogenannten Horst dar. Er entspricht im Aufbau und der Schichtenfolge äquivalenten Strukturen im näheren Umkreis, wie dem Tuniberg und Nimberg westlich sowie dem Schönberg südlich von Freiburg im Breisgau.
Vulkanismus
Petrologisch handelt es sich beim vulkanischen Kaiserstuhl um einen Alkaligesteins-Karbonatit-Komplex. Die den Großteil des zentralen und westlichen Kaiserstuhls aufbauenden vulkanischen Gesteine wurden vor rund 19 bis 16 Millionen Jahren im Miozän durch zahlreiche Vulkanausbrüche gebildet. Sie überlagern teilweise den sedimentären Sockel des östlichen Kaiserstuhls, wodurch dieser stellenweise kontaktmetamorph, das heißt durch Einwirkung hoher Temperatur, verändert wurde. Durch abwechselnde Eruption von Tephra und Lavaströmen aus mehreren Schloten bildete sich ein komplexer Schicht- oder Stratovulkan. Emporquellendes Magma erstarrte teilweise als subvulkanische Intrusion im Vulkangebäude und baut heute den Zentralkaiserstuhl auf. Lateral aufsteigende phonolithische Schmelzen drangen auch in den sedimentären Sockel des östlichen Kaiserstuhls. Bis heute wurden durch Erosion mehrere 100 m des ursprünglichen Vulkans abgetragen.
Vulkanische Gesteine
Der gesamte vulkanische Kaiserstuhl besteht aus Foid- und/oder Olivin-führenden, SiO2-untersättigten Gesteinen. Bei den Eruptivgesteinen handelt es sich zum größten Teil um Leucit-Tephrit, untergeordnet auch Phonolith, Limburgit und Olivin-Nephelinit (am Limberg bei Sasbach). Letzterer ist sehr reich an Xenolithen aus dem Erdmantel. Als Besonderheit bei den Eruptivgesteinen sind karbonatitische Ignimbrite und Lapilli zu nennen, die im Westkaiserstuhl an einigen Stellen (Henkenberg bei Burkheim, Kirchberg bei Oberrotweil) aufgeschlossen sind.
Bei den subvulkanischen Intrusionen und Ganggesteinen des zentralen Kaiserstuhls handelt es sich um die Tiefengesteinsäquivalente der Ausbruchsprodukte (Essexit, Karbonatit und grobkörnigerer Phonolith). Für verschiedene Varietäten der Ganggesteine existieren in der Literatur eine Fülle weiterer Bezeichnungen (Alvikit, Hauynophyr, Mondhaldeit, Tinguait, Monchiquit und viele andere), die aber teilweise keine allgemein anerkannten Gesteinsnamen sind. Von großem wissenschaftlichen Interesse ist der bei Altvogtsburg und Schelingen anstehende Karbonatit. Dabei handelt es sich um ein recht seltenes vulkanisches Gestein, das nicht aus einer silikatischen, sondern aus einer karbonatischen Schmelze auskristallisierte. Aufgrund dieses ungewöhnlichen Umstandes wurde die magmatische Natur des Karbonatits lange Zeit nicht erkannt oder in Zweifel gezogen. Alternative Interpretationen gingen von kontaktmetamorph veränderten Sedimentgesteinen aus, die bekanntermaßen in unmittelbarer Nähe zu finden sind. Erst in den 1950er- und 1960er-Jahren gelang es, das Gestein gesichert als Karbonatit zu identifizieren, unter anderem durch das Auffinden der eruptiven Karbonatite im westlichen Kaiserstuhl. Wegen des in ihm auftretenden Niob-Minerals Koppit wurde der Karbonatit in der Mitte des 20. Jahrhunderts versuchsweise bergmännisch abgebaut. Allerdings erwiesen sich die Gehalte als zu gering für eine Nutzung in größerem Umfang.
Minerale
Seit langer Zeit ist der Kaiserstuhl als Fundstelle für zum Teil seltene Minerale bekannt. Besondere Fundstellen sind die Steinbrüche im Limburgit des Limbergs (verschiedene Zeolithe), im Karbonatit am Badberg und Orberg (Koppit) und im Phonolith des Fohbergs und des Kirchbergs (Zeolithe, Wollastonit, Melanit). Überwiegend treten diese als Kluftminerale oder Blasenfüllungen (Mandelstein) auf.
Lössbedeckung
Der Kaiserstuhl ist heute weitgehend von einer quartären Lössschicht bedeckt. Löss ist ein Lockersediment, welches durch Erosion anderer Gesteine entsteht und durch äolischen Transport an seinen Ablagerungsort befördert wird. Der Löss entstand – wie im gesamten Randbereich der Oberrheinebene – während der letzten weitgehend vegetationsfreien Eiszeit durch Auswehung aus dem Rheinschlamm. Die Ablagerung fand im periglazialen (eisfreien, jedoch von Gletschereis umgebenen) Gebiet um den Kaiserstuhl statt. Der Hauptprozess, der in dieser Region stattfindet, ist Frostsprengung von Gestein. Da keine Vegetation vorhanden ist, die den Wind bremsen könnte, weht dieser beständig stark. Er nimmt das leichteste Material mit und lagert es an Hindernissen, beispielsweise dem Kaiserstuhl, wieder ab. Hierbei ist zu beachten, dass die Ablagerung im Lee stattfindet, im Falle des Kaiserstuhls – wo der Wind aus Südwesten wehte – also im Nordosten. Je höher der Sedimentationsort liegt, desto dünner ist die Schicht tatsächlich abgelagerten Materials. Am Kaiserstuhl liegt die Mächtigkeit der Lössschicht zwischen 10 und 40 Metern, es gibt jedoch auch Orte im Südwesten, an denen kein Löss sedimentiert wurde. Der Herkunftsort des Lösses am Kaiserstuhl lag hauptsächlich in den nördlichen Kalkalpen. Auffällig im anstehenden Löss ist ein sich in unregelmäßigen Abständen wiederholender, rostfarbener Streifen. Dieser entsteht durch die phasenweise Anlieferung neuen Materials. Während einer schwachen Sedimentationsphase verwittert das obenauf liegende Material, wobei der Kalk ausgewaschen wird. Hierbei bildet sich Lösslehm. Der ausgewaschene Kalkanteil fällt weiter unten im Bodenprofil wieder aus und bildet den sogenannten Lösskindelhorizont. Zu jedem Ausfällungshorizont gehört deshalb ein Anreicherungshorizont.
Die Lössböden des Kaiserstuhls werden agrarisch intensiv genutzt, da sie eine gute Belüftung bieten und eine hohe Wasserspeicherfähigkeit sowie mechanisch gute Eigenschaften besitzen. Außerdem sind im Zuge der landwirtschaftlichen Nutzung die sogenannten Lösshohlwege entstanden.
Der gewachsene Löss ist zudem für den Hochwasserschutz von Bedeutung, da er starke Niederschläge wie ein Schwamm aufnimmt und dann gleichmäßig wieder abgibt. Durch die Anlage von Großterrassen für den Weinbau am Kaiserstuhl wird der Löss jedoch mit Planierraupen verdichtet und verliert diese Eigenschaft.
Klima
Allgemeines
Klimatisch zählt der Kaiserstuhl zur temperaten (gemäßigten) Klimazone. Durch die in der Oberrheinebene vorherrschende Wärmebegünstigung gehört er jedoch zu den wärmsten Orten Deutschlands mit für Mitteleuropa vergleichsweise milden Wintern und warmen Sommern, die teilweise sogar Durchschnittstemperaturen von über 20 Grad in den Monaten Juli und August aufweisen können. Durch seine mit Löss bedeckten vulkanischen Böden ist er ein sehr gutes Weinanbaugebiet. Die klimatischen Voraussetzungen des Kaiserstuhls heben sich von seiner Umgebung deutlich ab. Er liegt im Regenschatten der Vogesen, im Einfluss der Burgundischen Pforte, und hat somit ein eher trockenes Klima.
Meteorologische Daten
Die Jahresmitteltemperatur beträgt 9,9 °C, wobei sowohl 50 bis 60 Sommertage als auch 60 bis 70 Frosttage zu verzeichnen sind. Dies spiegelt schon ein besonderes Merkmal des Kaiserstuhls wider, denn er zeichnet sich durch recht extreme Klimaverhältnisse aus, was sich besonders in der durchschnittlichen jährlichen Temperaturschwankung von 18,5 °C ausdrückt. Der mittlere Niederschlag auf dem Kaiserstuhl beträgt etwa 600 bis 700 mm, bei jährlich rund 1.720 Stunden Sonnenschein.
Flora und Fauna
Das Klima des Kaiserstuhls erklärt auch die große Fülle an wärmeliebender Flora und Fauna. Beispielsweise ist der Kaiserstuhl einer der Orte mit der größten Orchideenvielfalt in Europa – mehr als 30 Arten wurden registriert. Zwischen den Rebstöcken wuchern wilde Traubenhyazinthen, und an Böschungen blühen Schwertlilien. Außerdem leben hier Bienenfresser, Smaragdeidechsen und Gottesanbeterinnen (Mantis religiosa) – Arten, die ihren Verbreitungsschwerpunkt im mediterranen Bereich haben (nach neuen genetischen Studien handelt es sich bei der Smaragdeidechse allerdings um eine wahrscheinlich allochthone Population der Östlichen Smaragdeidechse). Die Flaumeiche ist ein Xerophyt und kommt sonst vor allem in Südeuropa vor, am Kaiserstuhl kann sie sich jedoch vor allem im Flaumeichenwald am Büchsenberg als Niederwald halten. Diese Arten leben in einem disjunkten Areal, also von ihrem normalen Verbreitungsgebiet abgetrennt. Dies ist ein Relikt einer postglazialen Warmzeit, zu der auch im Gebiet um den Kaiserstuhl ein deutlich wärmeres Klima herrschte. Nach Ende der Warmzeit konnten die genannten Arten nur noch am Kaiserstuhl überleben. Außerdem gibt es am Kaiserstuhl größere Populationen des Maikäfers. Die Art wurde in der Vergangenheit trotz Kritik von Umweltschützern mit Insektiziden bekämpft, so etwa im Jahr 2009. Die Aktion wurde damit begründet, dass der Maikäfer ansonsten existenzbedrohende Schäden in der umliegenden Landwirtschaft auslösen könnte.
Landschaftsveränderung
Die Oberfläche des Kaiserstuhls wurde vom wirtschaftenden Menschen seit dessen Besiedlung verändert. Da Löss infolge der Bodenbearbeitung stark erosionsanfällig ist, mussten Terrassen geschaffen werden, die meist als Rebflächen, teilweise auch für Obst- oder zum Ackerbau genutzt wurden. Dadurch entstanden schon früh die typischen kleinterrassierten Hänge, die zudem von den ebenfalls durch die „Nutzung“ entstandenen Lösshohlwegen durchzogen wurden.
Im Sinne der Flurbereinigung wurde um 1950 damit begonnen, zunächst kleinere Terrassen zusammenzulegen; dies endete in Großumlegungen, welche die ursprüngliche Landschaft in Teilbereichen völlig umgestalteten. Diese Umgestaltung begann zwischen 1950 und 1960 mit kleinräumigen Neuordnungen. Dabei wurde das Gelände meist in Handarbeit bzw. mit Hilfe betriebseigener Maschinen umgestaltet. In dieser Zeit wurden rund 950 ha von den Flurbereinigungsbehörden flurbereinigt.
Zwischen 1960 und 1970 wurden die Lösshänge umfassender umgestaltet, wobei große, tiefe und möglichst rechteckige Terrassenflächen mit entsprechend hohen Böschungen entstanden. Die Terrassen wurden mit bergseitiger Neigung angelegt, so dass jetzt vom Tal aus vielfach nur noch die Kanten sichtbar sind. Auf diese Art entstanden rund 650 ha Rebfläche.
Mit umfassendem Maschineneinsatz wurden die Großterrassenplanungen der Jahre 1970 bis 1976 umgesetzt, die das Landschaftsbild deutlich veränderten. Vor diesen Maßnahmen zeichneten sich in den sanften Hängen, deren Oberflächen von den kleinen Terrassen überprägt waren, noch die ursprünglich natürlich entstandenen Senken ab. Statt diesem Nebeneinander von natürlichen und vom Menschen geschaffenen Strukturen nehmen die Kritiker nun festungsartige und landschaftsfremde Oberflächen wahr, die eine Gesamtgröße von ca. 630 ha Rebfläche bieten. Da die Böschungen und sonstigen Flächen größer waren als die Rebflächen, erstreckte sich die Landschaftsveränderung jeweils auf mehr als das Doppelte der neu geschaffenen nutzbaren Fläche. Beispiele für diese Phase sind die Flurbereinigungen Oberrotweil-Oberberg, Ihringen-Abtsweingarten, Eichstetten-Hättlinsberg und Endingen am Kaiserstuhl-Schambach. Inzwischen war der Großteil der Lösshohlwege durch die Flurbereinigung verschwunden, die zuvor ökologische Nischen speziell für Wildbienen und Vögel gewesen waren.
Die letzte Phase der Rebflurbereinigung erstreckte sich auf die Zeit zwischen 1976 und 1982, in der unter anderem wegen der Proteste gegen die Großterrassenplanungen gemäßigt vorgegangen wurde: Die Böschungshöhen wurden auf maximal 10 m „beschränkt“, der Böschungsverlauf wurde „geschwungen angelegt und der Landschaft angepasst“. Mit diesen Verfahren wurden zum Beispiel in Oberbergen-Baßgeige oder in Bickensohl-Herrenstück rund 330 ha Rebfläche bearbeitet.
Nachdem ab 1977 durch länger anhaltende niederschlagsreiche Perioden Böschungsschäden entstanden waren, fielen in der Pfingstwoche des Jahres 1983 Niederschlagsmengen, die teilweise ein Drittel des Jahresmittels ausmachten. Diese führten in den umgelegten Gebieten zu Schäden: Die Böschungsoberflächen rutschten vielfach mitsamt der Vegetation ab, ehemalige, durch die Umlegungen verschüttete Talzüge wurden ausgeschwemmt, in einzelnen Terrassen entstanden tiefgreifende Grundbrüche. Überdies kam es in den Folgejahren zu Frostschäden. Durch die bergseitige Neigung der Terrassenoberflächen konnten sich Kaltluftseen bilden, in denen die Reben vor allem in der Blüte erfroren.[6] Außerdem entstanden, vor allem in den niedriger gelegenen Rebflächen, in denen zuvor meist Obst angebaut worden war, erhebliche Frostschäden am Holz der Rebbestände.
Die Tätigkeit der Flurbereinigungsbehörden beschränkte sich in der Zeit nach 1982 auf Reparaturarbeiten und partielle Umplanungen, die zumindest die schwersten Folgen der Umgestaltungen korrigieren sollten. Inzwischen hatte man auch begonnen, die verbliebenen Lösshohlwege als Naturdenkmale auszuweisen und sie zu schützen.
Seit 2021 wird auf einer Fläche von etwa einem Hektar Echter Lavendel und Lavandin angebaut. Dank der Wärme und der kalkreichen Böden gedeiht er gut. Zwei der vier Felder liegen in Bischoffingen, wo es auch einen Hofladen gibt und je eines in Königschaffhausen und Burkheim. Auf letzterem wachsen neun verschiedene Sorten.
Wandern
Der bekannteste und „klassische“ Wanderweg ist der Neunlindenpfad (Nord-Süd-Weg); er ist einer von acht Themenpfaden und führt von Endingen über den Katharinenberg und den Totenkopf mit Aussichtsturm Neunlinden nach Ihringen. Von den Wegen bieten sich vielerorts Ausblicke auf den Schwarzwald, die Rheinebene und die Vogesen. Auch der Querweg Schwarzwald–Kaiserstuhl–Rhein führt über den Kaiserstuhl.
Als Wissenschaftlicher Lehrpfad wurde 1977 der Limberg-Weg angelegt. Er umfasst 90 Stationen zu den Themen Geologie und Mineralogie, Geschichte, Naturschutz und Landschaftspflege, Forstwirtschaft, Wein- und Obstbau, Rheinbau und Wasserwirtschaft, sowie Landeskunde.
Die acht Themenpfade wurden 2007 mit einer Gesamtlänge von 140 km eröffnet und in das bestehende Wanderwegenetz des Schwarzwaldvereins (Markierung: gelber Rhombus auf weißem Hintergrund) integriert. Dabei wurde das Wanderwegenetz mit 430 neuen Wegweisern ausgeschildert. Große Tafeln mit einer Übersichtskarte und mit Standortinformationen sind an zentralen Punkten wie zum Beispiel an Bahnhöfen in den von den Themenpfaden verbundenen oder durchlaufenden Ortschaften aufgestellt. Jeder Themenpfad ist durch eine eigene Farbe und ein dem Namen entsprechendes Symbol auf den Eingangsportalen und den Wegweisern optisch gekennzeichnet. Weitere 120 kleinere Thementafeln erläutern entlang der Wanderwege lokale Besonderheiten. Örtliche Pfade, wie zum Beispiel der Brunnenpfad (7 km) in Bötzingen, wurden in das neue Netz der Themenpfade integriert.
Die acht Themenpfade wurden 2010 durch den Kaiserstuhlpfad ergänzt, der als Prädikatswanderweg das Gütesiegel „Qualitätsweg Wanderbares Deutschland“ erhielt. Der 21,7 km lange Kaiserstuhlpfad orientiert sich mit einigen Erweiterungen am Neunlindenpfad (Nord-Süd-Weg) und führt von Endingen durch das Erletal hoch zur Katharinenkapelle, entlang der Naturschutzgebiete Badberg und Haselschacher Buck zum Eichelspitzturm, weiter über den Vogelsang-Pass zum Neunlindenturm, durch den Lößhohlweg Eichgasse nach Bickensohl und über den Kreuzenbuck durch die Lenzengasse nach Ihringen.
(Wikipedia)
Not the sharpest photo..... However, in the world of weird coincidences, I saw Zeolite C O's photo of this very same consist at Dolton, IL shot a few days before this. The train has different cars (this looks like grain) but the consist is the same. May, 1988
Metra E8 515 leads the flood detouring California Zephyr out of Union Station at Canal St. on a very dark June day in 1993. Due to C&NW cab signaling these E's led the CZ over the North Western. Ran into Zeolite C O this day.
This is an image of a small mountain stream called Landamótsá and 688 meter tall Hánefstaðarfjall mountain in the background. I´m always interested in the backstory of the places I find beautiful and picturesque. However, not always these places are well known or properly recorded, so finding this backstory can be quite tedious. This place in particular was a bit of a struggle, but here is what I was able to unearth.
The name is mentioned in the Reykdæla saga. There a man named Hánefur lived in Óþveginstunga. He was described as a rich person who was involved in multiple disputes with other settlers as well as accused of stealing. I haven't gone through the whole saga, but he seems like an interesting character.
Backstory number 2. Recently discovered a rare silicate mineral called Garronite-Ca can be found near Hánefur mountain. This new zeolite is closely related to phillipsite and gismondite and has been found in Antrim county in Ireland and east Iceland. Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents and catalysts. These minerals for example can be used to filter water and other liquids.
Finally, if someone is in the mood for a dark, melodic soundscapes composed of strings and piano, I strongly recommend to give a listen to English musician Richard Skelton. One of his works is named Hánefstaðarfjall, and was given while he was recording his material in Iceland.
Hánefstaðarfjall, Iceland
Nikon D810, Irix 11mm
instagram.com/kaspars.dz.photo
For those who would be willing to support my work:
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Not exactly the thing you would hear from Han Solo or Luke Skywalker, but it saved the day for us. Thursday afternoon spent at Griffith, IN saw a lot of trains, but it was a sea of black and red GE's that rolled past us. We had just about given up for the day when Zeolite CO's scanner went off with the transmission that the 1033 was going to come out of Kirk yard right behind another one of those CN GE's. We waited around and were rewarded with back to back black IC SD70s, the 1033 and 1018.
a few of the beautiful mineral specimens (zeolites), on sale at the India Minerals booth (all eventually purchased by local museum) at the 2007 Houston Gem & Mineral Society's annual gem, mineral, rock and fossil show in Humble, Texas.
Fluorapophyllite (K), quartz, Paterson, Passaic County, FOV: 5 mm, Apo-Rodagon, 50 mm, Retro, Nikon Bellows, stacked with Helicon Focus
Earlier in our Dead Towers series we visited Delmar, Illinois. Today we proceed west on the Kankakee Belt to Reddick, Illinois. In this photo it appears that Reddick was just about (put a fork in it) done. The stairs have been removed, it's doing a lean and appears sadly ready for the demo crew or arsonists.
The New York Central crossed the Wabash here, where Blue Birds once flew between Chicago and St. Louis. However, in this December 1982 view the Blue Birds have left and only freight remains. Since then the Wabash through here has been removed.
Shot with a Canon F-1, 300mm lens and Kodachrome 25.
Zeolite's Dead Towers: collect the whole series!
Stilbite-Ca crystal with quartz from Jalgaon, India; FOV: 34 mm; Tamron 90 mm macro lens, stacked with Helicon Focus
Stellerite. The mineral, one of the uncommon members of the zeolite group, is a hydrous calcium aluminum silicate. Ritter Hot Springs. Ritter, Grant Co., Oregon.
Mesolite Needles on Thomsonite. Both minerals, members of the zeolite group, are hydrous sodium calcium aluminum silicates. The zeolites occur in vesicles in an Eocene porphyritic olivine basalt. Goble, Columbia Co., Oregon.
The NS OCS departed Chicago Thursday morning, bright and early...well, early anyway. I joined fellow Flickr gang member, Zeolite, and Jim Burd, and we parked our butts at Holmesville Road in uh, Holmesville, IN. The weather was downright crappy, and high ISO's were the order of the day, though Gary was armed with ASA100 film. The wait wasn't long, and the train rounded the curve and flew past us, those four F9s looking and sounding great. I've got a couple more of the OCS to post, and we also shot ten other trains in the gloom, though I probably won't punish anyone with postings of those. Guess I'll see what mood I'm in...
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Scoured by Ice Age glaciers, the dramatic east coast boasts long, narrow fjords with steep sides and jagged peaks which contrast with inland fertile farmlands. Natural harbours mean picture-postcard fishing villages and seemingly never-ending roads cross the region, providing beautiful sweeping views.
The East Fjords are a magnificent landscape of long, narrow fjords, steep mountains and jagged peaks. This is one of the oldest regions of Iceland, which was shaped by glaciers in the Ice Age. Glacial action uncovered magma chambers that had been about 3 km beneath the surface, where zeolites had formed.
Camera Model: Canon EOS 5D Mark II; Lens: EF17-40mm f/4L USM; Focal length: 29.00 mm; Aperture: 22; Exposure time: 8.0 s; ISO: 50
All rights reserved - Copyright © Lucie Debelkova - www.luciedebelkova.com
All images are exclusive property and may not be copied, downloaded, reproduced, transmitted, manipulated or used in any way without expressed, written permission of the photographer.
Stilbite-(Ca). The mineral is a zeolite -- a hydrous sodium calcium aluminum silicate. Wasson Bluff. Cumberland County, Nova Scotia, Canada.
Internal fractures making rainbows deep within a clear apophyllite crystal , with reflections of patterns on the crystal's surface as well...
Gee, I wonder why they call it that?
These colors are so impressive that the name comes up a lot. Artists Palette, Artists Drive, Artists Drive Formation...
You can thank ash for that. Volcanic ash was deposited in thick beds in the young barely recognizable valley that would later become Death Valley. Volcanic ash is often comprised mainly of volcanic glass. When it starts to decompose or devitrify, it releases large amounts of free silica. This silica often forms minerals called zeolites and zeolites can be very colorful!
Most pure zeolites are a shade of white but we have to look at their crystal structure to discover why they are so colorful, They have a lot of microporosity and all of that small intracrystal space readily absorbs impurities. It is these impurities that give it color.
Ever look up Salt Valley at Arches National Park from the overlook and see teal green outcrops scattered up the valley? Those are zeolites. How about the reds and purples in the Cainville Bentonites? Those are zeolites. The difference is that those colorful rocks are from the Jurassic Morrison formation. These rocks are much younger. But the colors are even more concentrated and all jumbled together here in these Miocene age rocks.
It is simply and naturally beautiful in the late afternoon light.
This view of the outcrop is about 1/4 mile before the official turnout a little over half way through the one way Artists Drive.
S0A9441
After what seemed like an eternity, the matching GP40FH-2's, 4137 and 4135, are back on the Hoosier State. No silver brick in sight. The southbound 850 or P318 is rolling past master photographer Zeolite, while Mrs. Zeolite lends moral support. It was a beautiful night except that the Hoosier State would sit at Dyer for quite awhile due to "freight interference" ahead just north of Lowell.
10X microscope image, stacked with Helicon. Sample from Lanzarote, Canary Islands. Collected 1/2014.
Rooting Mammillaria luethyi is not difficult compared to other species, and it can be done in a pure mineral soil.
After about 2-3 weeks the new roots should emerge, and in 1-2 years these will form a new taproot.
Data from two Mars missions have been used to create the first detailed global map of hydrated mineral deposits on Mars. These minerals are predominately clays and salts, and can be used to tell the history of water in the planet’s various regions. For the most part, the clays were created on Mars during its early wet period, whereas many of the salts that are still visible today were produced as the water gradually dried up.
The map has been painstakingly created over the last decade using data from ESA’s Mars Express Observatoire pour la Mineralogie, l’Eau, les Glaces et l’Activité (OMEGA) instrument and NASA’s Mars Reconnaissance Orbiter Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) instrument.
Various landing sites and areas of interest are shown on the map. Mawrth Vallis is an ancient water outflow channel that is rich in clays. Oxia Planum is another clay-rich region and has been selected as the landing site for ESA’s Rosalind Franklin rover. Meridiani Planum straddles the martian equator and was the landing spot for NASA’s Mars Exploration Rover Opportunity in 2004. Valles Marineris is one of the largest canyons in the Solar System. Gale crater and Jezero crater were the landing sites of NASA’s Curiosity and Perseverance rovers in 2012 and 2020 respectively.
The clays shown on the map include iron and magnesium phyllosilicates, zeolites and aluminosilicate clays. The salts shown are carbonates made of carbon and oxygen.
Credits: ESA/Mars Express (OMEGA and HRSC) and NASA/Mars Reconnaissance Orbiter (CRISM and HiRISE)
All three Iowa Pacific cowls are getting into it big time as they rumble across the CN ex EJ&E diamonds in Dyer. They're getting up some speed to make St John Hill, as Gary calls it, on their way south. I think we need Zeolite to show us the hill because I'm not exactly sure where it is, just that it's a little north of up-and-coming Cedar Lake.....
Heulandite. The mineral, one of the zeolite group, is a hydrated sodium calcium aluminum silicate. North Henson Creek. Uncompahgre Peak. Near Lake City, Hinsdale Co., Colo.
She passes under the unused former EJ&E bridge. She's off to St. Joe MI. where Zeolite C O would greet her.
We had just pulled off the road next to the crossing at the east end of Pinola, where the 3rd Main starts, and got out of Zeolite's big red pick up when we spotted a headlight. The NS executive Fs with the OCS came screaming past us in a flash. The three of us made our shots, turned to each other, and just started laughing. It was amazing what had just happened, no waiting forever, no missing the train. Just get out and take the shot in perfect light, no less. In over 40 years of enjoying this hobby, none of the three of us had ever had this happen. It was almost too good to be true. We're still laughing...
A cavity in basalt with white/clear chabazite and golden flowers of thomsonite with golden mesolite needle sprays. The black spot is probably a crystal of todorokite.
FOV about 20mm. Self-collected 2014.
Mesolite, a hydrous sodium, calcium, aluminum silicate; zeolite group.
Found in cavities in basalt.
Ritter, Oregon.
Field of view is just under one inch.
Thomsonite. The mineral, one of the zeolite group, occurs here as white radiating balls. It is a hydrated sodium calcium aluminum silicate. South Quarry. North Table Mountain. Golden, Jefferson Co., Colo.
1. Hvammsvik
Loftur Guðmundsson (1892-1952), a photographer, was born in Hvammsvík. He made the first Icelandic talkie, Milli fjalls og fjöru, which was filmed in Kjós in the 1950s. The film premiered in 1949.
The photographer Loftur Guð-mundsson (1892-1952) was born in Hvammsvík. Loftur made the first Icelandic film to include audible dialogue, Milli fjalls og fjöru. The film was shot in Kjós in the 1940s and premiered in 1949.
2. Sewerage
A church and rectory, known for the stay of the hymn poet Hallgrímur Pétursson (1614-1674), who was a priest there and wrote the Passion Psalms. Hallgrímskirkja in Saurbær is dedicated to the memory of Reverend Hallgrímur.
The church and vicarage of Saurbær is best known as the residence of Hallgrímur Péturs-son (1614-1674), who was the author of Passíusálmarnir (The Passion Psalms) as well as pastor at Saurbær. Hallgrim's Church in Saurbær is dedicated to the memory of Hallgrímur Pétursson.
3. Suffocate
Landnámsjörð. Four of the five peaks of the Botnssúlnar are visible from there and it is believed that the name is derived from that. Reverend Hallgrímur Pétursson spent the last years of his life there and died there.
Ferstikla has been inhabited since the first settlement of Iceland. Four out of five of Botnsúlur's peaks can be seen from Ferstikla and the name of the farm ("Four Strides") may come from this. Hall-grímur Pétursson died at Fer-stikla after spending the final years of his life there.
4. Middle sand
The Americans built an oil depot in the land of Miðsandur and Litlasandur during World War II. Miðsandur also had a depot for ship repairs. The station operated for decades for the benefit of the defense forces, along with a whaling station that began operations in 1948 and was back in operation in 2009 after a 20-year hiatus. There is still a remnant of the wartime era there.
The U.S. Navy built an oil supply station at Miðsandur and Litlisandur. At Miðsandur there was also a supply station for ship repairs. The station con-tinued to operate for decades after the war, along with a whaling station, which opened in 1948 and was again in full use in 2009 after 20 years pause. The barracks built at Miðsandur during World War II are still standing.
5. Geirshólmur
Klettahólmi, where it is said in the saga of Harður Grímkelsson that a band of robbers led by Harður Grimkelsson stayed for a while. The villagers then lured the people of Hólm to land with promises of reconciliation, but betrayed them and killed them all.
Geirshólmi is a small rocky island where, according to the saga of Hörður Grim-kelsson, a group of outlaws led by Hörður lived for some time. The local people supposedly lured the outlaws onto the mainland with promises of reconciliation, then betrayed them and killed them all.
6. Pyrill
A peculiar basalt mountain surrounded by cliffs, 388 m. Many types of rare fluorite are found here. There is a cleft in the mountain, Helguskarð, which legend says that Helga Jarlsdóttir climbed with her sons during their escape after the massacre of the Hólm people when she had swum with them to land from Geirshólmi. Under the mountain is a town of the same name, which is related to the story of Harðar. In Þyrilsklif, liparite is mined for cement production.
Pyrill is a 388 metre high basalt peak surrounded by spectacular cliffs. Many rare zeolites can be found there. There is a canyon in the mountain called Helguskarð. According to legend, Helga Jarlsdóttir escaped up the canyon with her sons after the outlaws from Geirshólmi were killed. She and her sons had swum from Geirshólmi to the mainland. Beneath the mountain is a farm of the same name, which is mentioned in the saga of Hörður Grímkelsson. Rhyolite is mined from Pyrill for cement production.
7. Botnsá
On the Botnsá River is the Glymur waterfall, about 200 m, the highest waterfall in the country. There are popular hiking trails there. At Botnsá River are the county borders of Gullbringu- and Kjósarsýsla and Borgarfjörður counties.
On the river Botnsá is the 200-metre high waterfall Glymur. Glymur is the high-est waterfall in Iceland. There are many popular trails in the area. The river Botnsá forms the boundary between the counties Gull-bringu- and Kjósarsýsla and Borgarfjarðarsýsla.
*At Hvítanes you can still see the structures of the British Navy from its activities in Hvalfjörður during World War II. The military activities were extensive in Hvalfjörður and caused great disruption to the lives of people in the area,
Some were employed by the military. Inside Hivitanes are the remains of steps built when Winston Churchill arrived in the country in 1941. The military structures were demolished after the occupation.
Mesolite is a tectosilicate mineral . It is a member of the zeolite group and is closely related to natrolite which it also resembles in appearance.
Monte Santa Vittoria.
Può sembrare un arco naturale ma è stato scavato, nel corso di decenni, da generazioni di ricercatori di cristalli.
Il sito è famoso per le zeoliti (stilbite) presenti nelle rocce vulcaniche della zona.
Monte Santa Vittoria.
It may look like a natural arch but has been excavated, over decades, by generations of crystal researchers.
The site is famous for the zeolites (stilbite) found in the volcanic rocks of the area.
Gonnardite, a rare member of the Zeolite Group, is hydrous sodium calcium aluminum silicate. Southeast Quarry. North Table Mountain. Golden, Jefferson Co., Colo.
Deutschland - Baden-Württemberg - Kaiserstuhl
Schelinger Matten
The Kaiserstuhl (German: [ˈkaɪzɐʃtuːl], lit. "Emperor’s Chair") is a range of hills in the state of Baden-Württemberg in southwest Germany with a maximum height of 556.6 metres (1,826 ft). It is of volcanic origin and located in the southwest of the state in the counties of Emmendingen and Breisgau-Hochschwarzwald. In terms of natural regions it is considered to be a part of the Upper Rhine Plain.
Name
The name "Kaiserstuhl" is believed to refer to King Otto III, who held court near Sasbach on 22 December 994. From then on, the whole hill range was called the Königsstuhl – the King’s Chair. In May 996, Otto III was crowned Emperor and the King’s Chair eventually became the Emperor’s Chair – "Kaiserstuhl". Reliable sources mention the name Kaiserstuhl only as early as 1304 and historians thus suppose that the term Kaiserstuhl was not coined until the 13th century.
Geography
Location
The Kaiserstuhl is situated in South Baden, mainly in Breisgau-Hochschwarzwald county or district. However, the smaller northern part belongs to Emmendingen. Within the Upper Rhine Plain it is situated about 16 km northwest of the city of Freiburg, right next to the eastern bank of the Rhine and a short distance west of the Dreisam. It reaches up to 377 metres above the level of the Rhine downstream (179.5 m a.s.l.) from the weir close to Burkheim.
At its greatest extent, from the Michaelsberg near Riegel in the northeast, to the Fohrenberg, by Ihringen in the southwest, the Kaiserstuhl is about 15 km long. Its maximum width is about 12.5 km.
Hills
The hills of the Kaiserstuhl include the following (sorted by height in metres above sea level):
Totenkopf (556.6 m), 1.9 km east of Bickensohl; with the Vogtsburg 1 telecommunication tower and Neunlinden observation tower
Eichelspitze (521.3 m), 2.8 km northwest of Bötzingen
Katharinenberg (492.4 m), 1.3 km southeast of Amoltern
Bisamberg (469.0 m), 1.2 km south of Amoltern
Staffelberg (446.0 m), 1.5 km northwest of Schelingen
Badberg (432.7 m) (protected area), 1.5 km east of Oberbergen
Holzeck (431.9 m), 1.7 km northeast of Ihringen; with tower
Hochbuck (374.8 m), 900 m south of Achkarren
Schlossberg (352.1 m), 500 m northwest of Achkarren; with Höhingen Castle ruins
Böselsberg (340.1 m), 500 m northwest of Wasenweiler
Büchsenberg (283.7 m), 1.3 km west of Achkarren
Geology
The formation of the Kaiserstuhl volcano during the Tertiary was the climax and at the same time the end of volcanic activity in the Upper Rhine Valley Rift. Volcanism started as early as the Cretaceous Period. Volcanic landforms include heavily eroded volcanic vents. The Kaiserstuhl is the only larger volcano from this period in the rift valley. Geologically the Kaiserstuhl can be divided into two parts: the sedimentary and volcanic part. Due to these peculiarities the Kaiserstuhl has been labeled one of the most important national geotopes.
Sedimentary base
The horizontal sedimentary layers forming the eastern third of the Kaiserstuhl date back to the Jurassic and the Tertiary long before the volcanic activity. Important stratigraphic outcrops include the Hauptrogenstein (local oolite) which is found mainly near the village of Riegel and the Pechelbronner Schichten (local Tertiary layers in the South German Scarplands) near Bötzingen. During the formation of the Upper Rhine Plain this part of the Kaiserstuhl sloped less in respect to its surrounding area – and thus appears as a so-called horst. In terms of its geological structure and the sequence of its escarpments, the Kaiserstuhl is comparable to the nearby Tuniberg, Nimberg and also to the Schönberg, which is situated south of the city of Freiburg.
Volcanic activity
Petrologically the volcanic Kaiserstuhl is an alkali-carbonate rock formation. The volcanic rocks making up a large part of the central and western Kaiserstuhl were the result of numerous volcanic eruptions during the Miocene, about 19 to 16 million years ago. They cover parts of the sedimentary base of the eastern Kaiserstuhl, which is why in some places changes in the base’s mineralogical composition occurred. The driving force behind this process of contact metamorphism was an increase in temperature. Due to the alternate eruption of tephra and lava flows from several vents a complex stratovolcano came into existence. Some of the rising magma solidified as volcanic intrusions below the surface – and today forms the central part of the Kaiserstuhl. Laterally rising phonolite magma also intruded into the sedimentary base of the Eastern Kaiserstuhl. Several hundred metres of the original volcano have been eroded.
Volcanic rocks
The entire volcanic Kaiserstuhl consists of rock types that contain feldspathoid minerals and olivine and are undersaturated with SiO2. Most igneous rocks at the surface are leucite-tephrites, with subordinate phonolites, limburgites, and olivine-nephelinites (at the Limberg Mountain near Sasbach), the last of which is rich in xenoliths from the Earth’s mantle. Carbonatite ignimbrite and lapilli are local peculiarities; they can be found in places in the western part of the Kaiserstuhl (Henkenberg near Burkheim, Kirchberg near Oberrotweil).
The subvolcanic and intrusive rocks of the central Kaiserstuhl are plutonic equivalents of the erupted material (essexite, carbonatite and coarse-granular phonolite). Several local terms which do not carry official status with the International Union of Geological Sciences have been used for different varieties of the intrusive rocks. Of major scientific interest is the consolidated carbonatite near Altvogtsburg und Schelingen. It is a quite rare volcanic rock, which crystallized from a carbonate magmatic melt rather than a silicate one. Given its unusual composition for an igneous rock, the magmatic nature of the carbonatite was not proposed for a long time and remained doubtful subsequently. An alternative interpretation was that it was a metamorphically altered sedimentary rock, examples of which can be found nearby. Only in the 1950s and 1960s did research prove that it was a carbonatite; one of the clues was identification of the eruptive carbonatites found in the western part of the Kaiserstuhl. The carbonatite contains the niobium rich pyrochlore; attempts to mine the carbonatite rock for niobium were carried out in the middle of the 20th century, but the amount turned out to be too small to be economical.
Minerals
For a long time the Kaiserstuhl has been known for rare minerals. Examples include the quarries at the Limberg (zeolites), Badberg (carbonatites), Orberg and Fohberg. Well-crystallized minerals can be found predominantly in clefts or cavities in the volcanic rock.
Loess
The Kaiserstuhl is today largely covered by a Quaternary loess layer, a loosely cemented sediment. It is derived from other rocks through erosion and is then transported by the wind. The loess at the Kaiserstuhl – as in all the peripheral areas of the Upper Rhine Valley – was formed during the last Ice Age. Large parts were bare of vegetation and so loess was winnowed out from the Rhine sediments. It was then deposited in the periglacial area (i.e. ice-free, but surrounded by glaciers) at the Kaiserstuhl. The major process active here was frost weathering resulting in crushed rocks. The wind blew strongly, as there was no vegetation that could have moderated it – entraining the lightest material and depositing it at obstacles like the Kaiserstuhl. Deposition took place northeast of the Kaiserstuhl, as the winds blew from the southwest.
The higher the place of sedimentation, the thinner the layer of the sedimented material is. At the Kaiserstuhl the thickness of the loess layer varies between 10 and 40 metres. There are, however, also areas in the southwest where no loess has been deposited. The Northern Limestone Alps are considered the main source of the Kaiserstuhl loess. A rust-coloured band occurs at irregular intervals. It developed as a new material and did not arrive regularly but in phases of different intensities. In a phase of weak sedimentation the material on top weathered – and the calcium carbonate was washed out. It then precipitated further down and formed a particular type of soil horizon, which contains concretions of calcium carbonate.
The Kaiserstuhl loess soils are used for intensive farming, as they offer good aeration, high water storage capacities and good mechanical qualities. Besides, as a result of farming deep narrow ravine-like paths developed.
As the loess developed over time it is, furthermore, significant for flood control. Sponge-like, it absorbs and then gently releases rainfall. This quality is however lost when bulldozers, employed to construct large terraces for viticulture, compress the loess.
Climate
General
The Kaiserstuhl is one of the warmest regions in Germany. The winters are relatively mild for the area, and the summers are warm or even hot, with possible average temperatures of over 20 °C (68 °F) in July and August. Because of its loess covered volcanic soils it is a very good wine-producing region. The climatic situation of the Kaiserstuhl is outstanding in the area. It is rain-shadowed by the Vosges Mountains, under the climatic influence of the Belfort Gap and is characterized by a drier and hotter climate, which one would rather expect not to be typical of the area. Despite this, winters remain cold and dry, and summers wet, in comparison with Mediterranean climate (which instead has a rainfall peak during winter, which can see few frost days, and a dry season in summer).
Meteorological data
The average annual temperature is 9.9 °C (49.8 °F), with 50–60 days with a maximum temperature above 25 °C (77 °F) as well as 60–70 days with a minimum temperature below 0 °C (32 °F). This illustrates a special feature of the Kaiserstuhl: it is characterized by its relatively extreme climate. The average difference between the lowest and the highest average temperatures within one year is 18.5 °C (65.3 °F). The mean precipitation at the Kaiserstuhl is approximately 600–700 millimetres (24–28 in), with about 1,720 hours of sunshine per year.
Flora and fauna
The climate of the Kaiserstuhl also explains the vast richness of thermophile flora and fauna. The Kaiserstuhl is for example one of the places with the largest variety of orchids in Europe – more than 30 species have been recorded. Among the vines wild grape hyacinths sprawl and along acclivities iris plants blossom. Furthermore, sand lizards (lacerta bilineata) and praying mantis (Mantis religiosa) live here – species which mainly occur in the Mediterranean area. (However, according to the latest research results the sand lizard presumably belongs to the allochthonous species of the European green lizard (Lacerta viridis)). The pubescent oak (Quercus pubescens) is a Xerophyte and normally only occurs in Southern Europe, but is also able to survive at the Kaiserstuhl. This species has a disjunct distribution, which means away from its normal habitat. It is a relict of a postglacial warm period where there had been a much warmer climate around the Kaiserstuhl. After the end of the warm period only the named species were able to survive. Besides there is a larger population of the May beetle (Melolontha melolontha). In spite of protests from conservationists the May Beetle is controlled by the use of insecticides.
Changes in landscape
The terrain of the Kaiserstuhl has been altered by the people living there since it was settled. The loam there is strongly susceptible to erosion as a result of soil cultivation, thus terraces had to be added, which were then mostly used as vineyards, as well as fruit growing or for other agricultural uses. As a result, the typical small "patio" hillsides and the streaked loess sunken roads typical of the region came into being.
To start with, it was for this reason that smaller terraces were merged in around 1950, this resulted in large scale reallocation, which turned parts of the original landscape completely upside down.
The phases of this reallocation were:-
Small-scale realignment between 1950 and 1960. At the same time the terrain was generally modified by manual labour with the help of in-house machines. During this time approximately 950 hectares were enclosed by the farmland consolidation authority.
Between 1960 and 1970 the loess slopes were more comprehensively modified, whereby large rectangular terraced areas with corresponding high embankments were made. The terraces were arranged with mountain like slopes so that now only the multiple slope edges are visible from the valley. About 650 hectares of the surface were styled in this way.
The plans to create large-scale terraces made between 1970 and 1976 were executed with the help of heavy machinery, changing the landscape radically. Before the original, naturally formed, depressions had still been visible in the gentle hillsides with only small terraces. Natural and man-made structures existed side by side. However, these small-scale structures were then obliterated completely. Monstrous areas resembling fortresses and entirely incongruous to the region were created. The total wine-growing area of the terraces was 630 ha. As the embankments and other areas exceeded the size of the wine-growing areas, the changes affected more than twice the newly created arable area. The land reforms of Oberrotweil-Oberberg, Ihringen-Abtsweingarten, Eichstetten-Hättlinsberg and Endingen am Kaiserstuhl-Schambach are examples of this phase.
The last phase of wine-growing land reforms was realized between 1976 and 1982. Due, in part, to protests against plans for further large scale terraces the changes were not as radical as the previous phase: the maximum height for embankments was "limited" to 10 m and their shapes were "made smooth and adjusted to the landscape" (Mayer 1986, citation translated). This procedure was, for example, applied to about 330 ha of wine-growing area in Oberbergen-Baßgeige or in Bickensohl-Herrenstück.
From 1977 on, several longer periods of enhanced precipitation caused damage to the embankments. During one week in May 1983 for example, the amount of precipitation was so large that in some areas it was equivalent to one third of the annual average, causing great damage in the modified areas.
The surfaces of the acclivities often slid off together with the vegetation. Former valleys, which had been blocked due to re-allocation, were flushed out. In some terraces dramatic shear failures developed. In addition extensive, devastating frost damage occurred; due to the incline of the mountainside at the surfaces of the acclivities, cold air pockets were formed in which the vines in bloom were frostbitten. Additionally substantial frost damage occurred in the woody part of the vines, especially in the vineyards which were situated in lower regions. In earlier times fruit had mostly been grown here but later this was changed to vineyards.
The activity of the farmland consolidation authority was narrowed to repairing and partly to rescheduling which at least was meant to correct the most severe consequences of the transformations from 1982 on.
Hiking
There are many opportunities for hiking in the Kaiserstuhl. The best known trail is the North-South Trail (check mark: blue rhomb on yellow background) from Endingen across the Katharinenberg and the Totenkopf and the Neunlinden viewing point to Ihringen. From the trail there are panoramic views over the Black Forest, the Upper Rhine Valley and the Vosges.
(Wikipedia)
Der Kaiserstuhl ist ein bis 556,8 m ü. NHN hohes, kleines Mittelgebirge vulkanischen Ursprungs in der Oberrheinischen Tiefebene. Es erhebt sich im Südwesten von Baden-Württemberg (Deutschland), in den Landkreisen Emmendingen und Breisgau-Hochschwarzwald.
Namensdeutung
Seinen Namen hat der Kaiserstuhl vermutlich von König Otto III., der bei Sasbach am 22. Dezember 994 einen Gerichtstag abhielt. Nach diesem Gerichtstag wurde das ganze Gebirge als „Königsstuhl“ bezeichnet. Nachdem Otto III. im Mai 996 zum Kaiser gekrönt worden war, wurde aus dem „Königsstuhl“ der „Kaiserstuhl“. Nachweislich belegt ist die Bezeichnung „Kaiserstuhl“ erst seit 1304. Historiker vermuten, dass der Begriff „Kaiserstuhl“ nicht vor dem 13. Jahrhundert entstand.
Geographie
Lage
Naturräumlich wird der Kaiserstuhl zum Oberrheinischen Tiefland gezählt und stellt dort die Haupteinheit 203 dar. Er befindet sich in Südbaden zum Großteil im Landkreis Breisgau-Hochschwarzwald, der kleine Nordteil gehört zum Landkreis Emmendingen. Innerhalb der Oberrheinischen Tiefebene liegt er etwa 16 km nordwestlich der Großstadt Freiburg, direkt östlich des Rheins und etwas westlich der Dreisam. Er erhebt sich maximal 377,1 m über den Rhein unterhalb (179,5 m) des Stauwehrs bei Burkheim.
In seiner weitesten Ausdehnung vom Michaelsberg bei Riegel im Nordosten bis zum Fohrenberg bei Ihringen im Südwesten ist der Kaiserstuhl rund 15 km lang, seine größte Breite beträgt etwa 12,5 km.
Berge
Zu den Bergen, Erhebungen und deren Ausläufern des Kaiserstuhls gehören – sortiert nach Höhe in Meter (m) über Normalhöhennull[1]:
Totenkopf (556,8 m), 1,9 km östlich von Bickensohl; mit Fernmeldeturm Vogtsburg-Totenkopf und Aussichtsturm Neunlinden
Eichelspitze (521,3 m), 2,8 km nordwestlich von Bötzingen mit dem Eichelspitzturm
Katharinenberg (491,9 m), 1,3 km südsüdöstlich von Amoltern
Bisamberg (469,6 m), 1,2 km südlich von Amoltern
Staffelberg (447,6 m), 1,5 km nordnordwestlich von Schelingen
Badberg (432,7 m) (Naturschutzgebiet), 1,5 km östlich von Oberbergen
Holzeck (431,9 m), 1,7 km nordnordöstlich von Ihringen; mit Sendeturm
Hochbuck (375,2 m), 900 m südlich von Achkarren
Schlossberg (351,9 m), 500 m nordwestlich von Achkarren; mit Burgruine Höhingen
Böselsberg (340,1 m), 500 m nordwestlich von Wasenweiler
Hochberg, (288,7 m), 900 m nordöstlich von Jechtingen
Büchsenberg (283,7 m), 1,3 km westlich von Achkarren
Geologie
Die Entstehung des Kaiserstuhlvulkans im Tertiär stellt sowohl den Höhepunkt als auch den Schlusspunkt der vulkanischen Aktivität im Oberrheingraben dar. Diese begann schon in der Kreidezeit und zeigt sich in zahlreichen, heute tief erodierten Vulkanschloten. Der Kaiserstuhl ist der einzige größere Vulkan aus dieser Zeit im Bereich des Oberrheingrabens. Dieser trifft hier auf den Bonndorfer Graben, der über den Hegau zum Bodensee führt. Gegen Ende des Oligozäns drang Magma empor, erstarrte jedoch noch unter der Erdoberfläche. Erst im Miozän kam es zu einem Durchbruch und zu großflächigen Lavaströmen. Geologisch gesehen lässt sich der Kaiserstuhl in einen sedimentären und einen vulkanischen Teil gliedern. Aufgrund dieser Besonderheiten wurde der Kaiserstuhl als eines der bedeutendsten nationalen Geotope Deutschlands ausgezeichnet.
Sedimentärer Sockel
Die das östliche Drittel bildenden, nahezu horizontal lagernden Sedimentgesteine wurden lange vor der vulkanischen Aktivität zu Zeiten des Juras und Tertiärs gebildet. Wichtige aufgeschlossene stratigraphische Einheiten sind der Hauptrogenstein (hauptsächlich in Riegel) und die Pechelbronner Schichten (in der Gegend von Bötzingen). Dieser Teil des Kaiserstuhls wurde während der Entstehung des Oberrheingrabens weniger stark als seine Umgebung abgesenkt und stellt einen sogenannten Horst dar. Er entspricht im Aufbau und der Schichtenfolge äquivalenten Strukturen im näheren Umkreis, wie dem Tuniberg und Nimberg westlich sowie dem Schönberg südlich von Freiburg im Breisgau.
Vulkanismus
Petrologisch handelt es sich beim vulkanischen Kaiserstuhl um einen Alkaligesteins-Karbonatit-Komplex. Die den Großteil des zentralen und westlichen Kaiserstuhls aufbauenden vulkanischen Gesteine wurden vor rund 19 bis 16 Millionen Jahren im Miozän durch zahlreiche Vulkanausbrüche gebildet. Sie überlagern teilweise den sedimentären Sockel des östlichen Kaiserstuhls, wodurch dieser stellenweise kontaktmetamorph, das heißt durch Einwirkung hoher Temperatur, verändert wurde. Durch abwechselnde Eruption von Tephra und Lavaströmen aus mehreren Schloten bildete sich ein komplexer Schicht- oder Stratovulkan. Emporquellendes Magma erstarrte teilweise als subvulkanische Intrusion im Vulkangebäude und baut heute den Zentralkaiserstuhl auf. Lateral aufsteigende phonolithische Schmelzen drangen auch in den sedimentären Sockel des östlichen Kaiserstuhls. Bis heute wurden durch Erosion mehrere 100 m des ursprünglichen Vulkans abgetragen.
Vulkanische Gesteine
Der gesamte vulkanische Kaiserstuhl besteht aus Foid- und/oder Olivin-führenden, SiO2-untersättigten Gesteinen. Bei den Eruptivgesteinen handelt es sich zum größten Teil um Leucit-Tephrit, untergeordnet auch Phonolith, Limburgit und Olivin-Nephelinit (am Limberg bei Sasbach). Letzterer ist sehr reich an Xenolithen aus dem Erdmantel. Als Besonderheit bei den Eruptivgesteinen sind karbonatitische Ignimbrite und Lapilli zu nennen, die im Westkaiserstuhl an einigen Stellen (Henkenberg bei Burkheim, Kirchberg bei Oberrotweil) aufgeschlossen sind.
Bei den subvulkanischen Intrusionen und Ganggesteinen des zentralen Kaiserstuhls handelt es sich um die Tiefengesteinsäquivalente der Ausbruchsprodukte (Essexit, Karbonatit und grobkörnigerer Phonolith). Für verschiedene Varietäten der Ganggesteine existieren in der Literatur eine Fülle weiterer Bezeichnungen (Alvikit, Hauynophyr, Mondhaldeit, Tinguait, Monchiquit und viele andere), die aber teilweise keine allgemein anerkannten Gesteinsnamen sind. Von großem wissenschaftlichen Interesse ist der bei Altvogtsburg und Schelingen anstehende Karbonatit. Dabei handelt es sich um ein recht seltenes vulkanisches Gestein, das nicht aus einer silikatischen, sondern aus einer karbonatischen Schmelze auskristallisierte. Aufgrund dieses ungewöhnlichen Umstandes wurde die magmatische Natur des Karbonatits lange Zeit nicht erkannt oder in Zweifel gezogen. Alternative Interpretationen gingen von kontaktmetamorph veränderten Sedimentgesteinen aus, die bekanntermaßen in unmittelbarer Nähe zu finden sind. Erst in den 1950er- und 1960er-Jahren gelang es, das Gestein gesichert als Karbonatit zu identifizieren, unter anderem durch das Auffinden der eruptiven Karbonatite im westlichen Kaiserstuhl. Wegen des in ihm auftretenden Niob-Minerals Koppit wurde der Karbonatit in der Mitte des 20. Jahrhunderts versuchsweise bergmännisch abgebaut. Allerdings erwiesen sich die Gehalte als zu gering für eine Nutzung in größerem Umfang.
Minerale
Seit langer Zeit ist der Kaiserstuhl als Fundstelle für zum Teil seltene Minerale bekannt. Besondere Fundstellen sind die Steinbrüche im Limburgit des Limbergs (verschiedene Zeolithe), im Karbonatit am Badberg und Orberg (Koppit) und im Phonolith des Fohbergs und des Kirchbergs (Zeolithe, Wollastonit, Melanit). Überwiegend treten diese als Kluftminerale oder Blasenfüllungen (Mandelstein) auf.
Lössbedeckung
Der Kaiserstuhl ist heute weitgehend von einer quartären Lössschicht bedeckt. Löss ist ein Lockersediment, welches durch Erosion anderer Gesteine entsteht und durch äolischen Transport an seinen Ablagerungsort befördert wird. Der Löss entstand – wie im gesamten Randbereich der Oberrheinebene – während der letzten weitgehend vegetationsfreien Eiszeit durch Auswehung aus dem Rheinschlamm. Die Ablagerung fand im periglazialen (eisfreien, jedoch von Gletschereis umgebenen) Gebiet um den Kaiserstuhl statt. Der Hauptprozess, der in dieser Region stattfindet, ist Frostsprengung von Gestein. Da keine Vegetation vorhanden ist, die den Wind bremsen könnte, weht dieser beständig stark. Er nimmt das leichteste Material mit und lagert es an Hindernissen, beispielsweise dem Kaiserstuhl, wieder ab. Hierbei ist zu beachten, dass die Ablagerung im Lee stattfindet, im Falle des Kaiserstuhls – wo der Wind aus Südwesten wehte – also im Nordosten. Je höher der Sedimentationsort liegt, desto dünner ist die Schicht tatsächlich abgelagerten Materials. Am Kaiserstuhl liegt die Mächtigkeit der Lössschicht zwischen 10 und 40 Metern, es gibt jedoch auch Orte im Südwesten, an denen kein Löss sedimentiert wurde. Der Herkunftsort des Lösses am Kaiserstuhl lag hauptsächlich in den nördlichen Kalkalpen. Auffällig im anstehenden Löss ist ein sich in unregelmäßigen Abständen wiederholender, rostfarbener Streifen. Dieser entsteht durch die phasenweise Anlieferung neuen Materials. Während einer schwachen Sedimentationsphase verwittert das obenauf liegende Material, wobei der Kalk ausgewaschen wird. Hierbei bildet sich Lösslehm. Der ausgewaschene Kalkanteil fällt weiter unten im Bodenprofil wieder aus und bildet den sogenannten Lösskindelhorizont. Zu jedem Ausfällungshorizont gehört deshalb ein Anreicherungshorizont.
Die Lössböden des Kaiserstuhls werden agrarisch intensiv genutzt, da sie eine gute Belüftung bieten und eine hohe Wasserspeicherfähigkeit sowie mechanisch gute Eigenschaften besitzen. Außerdem sind im Zuge der landwirtschaftlichen Nutzung die sogenannten Lösshohlwege entstanden.
Der gewachsene Löss ist zudem für den Hochwasserschutz von Bedeutung, da er starke Niederschläge wie ein Schwamm aufnimmt und dann gleichmäßig wieder abgibt. Durch die Anlage von Großterrassen für den Weinbau am Kaiserstuhl wird der Löss jedoch mit Planierraupen verdichtet und verliert diese Eigenschaft.
Klima
Allgemeines
Klimatisch zählt der Kaiserstuhl zur temperaten (gemäßigten) Klimazone. Durch die in der Oberrheinebene vorherrschende Wärmebegünstigung gehört er jedoch zu den wärmsten Orten Deutschlands mit für Mitteleuropa vergleichsweise milden Wintern und warmen Sommern, die teilweise sogar Durchschnittstemperaturen von über 20 Grad in den Monaten Juli und August aufweisen können. Durch seine mit Löss bedeckten vulkanischen Böden ist er ein sehr gutes Weinanbaugebiet. Die klimatischen Voraussetzungen des Kaiserstuhls heben sich von seiner Umgebung deutlich ab. Er liegt im Regenschatten der Vogesen, im Einfluss der Burgundischen Pforte, und hat somit ein eher trockenes Klima.
Meteorologische Daten
Die Jahresmitteltemperatur beträgt 9,9 °C, wobei sowohl 50 bis 60 Sommertage als auch 60 bis 70 Frosttage zu verzeichnen sind. Dies spiegelt schon ein besonderes Merkmal des Kaiserstuhls wider, denn er zeichnet sich durch recht extreme Klimaverhältnisse aus, was sich besonders in der durchschnittlichen jährlichen Temperaturschwankung von 18,5 °C ausdrückt. Der mittlere Niederschlag auf dem Kaiserstuhl beträgt etwa 600 bis 700 mm, bei jährlich rund 1.720 Stunden Sonnenschein.
Flora und Fauna
Das Klima des Kaiserstuhls erklärt auch die große Fülle an wärmeliebender Flora und Fauna. Beispielsweise ist der Kaiserstuhl einer der Orte mit der größten Orchideenvielfalt in Europa – mehr als 30 Arten wurden registriert. Zwischen den Rebstöcken wuchern wilde Traubenhyazinthen, und an Böschungen blühen Schwertlilien. Außerdem leben hier Bienenfresser, Smaragdeidechsen und Gottesanbeterinnen (Mantis religiosa) – Arten, die ihren Verbreitungsschwerpunkt im mediterranen Bereich haben (nach neuen genetischen Studien handelt es sich bei der Smaragdeidechse allerdings um eine wahrscheinlich allochthone Population der Östlichen Smaragdeidechse). Die Flaumeiche ist ein Xerophyt und kommt sonst vor allem in Südeuropa vor, am Kaiserstuhl kann sie sich jedoch vor allem im Flaumeichenwald am Büchsenberg als Niederwald halten. Diese Arten leben in einem disjunkten Areal, also von ihrem normalen Verbreitungsgebiet abgetrennt. Dies ist ein Relikt einer postglazialen Warmzeit, zu der auch im Gebiet um den Kaiserstuhl ein deutlich wärmeres Klima herrschte. Nach Ende der Warmzeit konnten die genannten Arten nur noch am Kaiserstuhl überleben. Außerdem gibt es am Kaiserstuhl größere Populationen des Maikäfers. Die Art wurde in der Vergangenheit trotz Kritik von Umweltschützern mit Insektiziden bekämpft, so etwa im Jahr 2009. Die Aktion wurde damit begründet, dass der Maikäfer ansonsten existenzbedrohende Schäden in der umliegenden Landwirtschaft auslösen könnte.
Landschaftsveränderung
Die Oberfläche des Kaiserstuhls wurde vom wirtschaftenden Menschen seit dessen Besiedlung verändert. Da Löss infolge der Bodenbearbeitung stark erosionsanfällig ist, mussten Terrassen geschaffen werden, die meist als Rebflächen, teilweise auch für Obst- oder zum Ackerbau genutzt wurden. Dadurch entstanden schon früh die typischen kleinterrassierten Hänge, die zudem von den ebenfalls durch die „Nutzung“ entstandenen Lösshohlwegen durchzogen wurden.
Im Sinne der Flurbereinigung wurde um 1950 damit begonnen, zunächst kleinere Terrassen zusammenzulegen; dies endete in Großumlegungen, welche die ursprüngliche Landschaft in Teilbereichen völlig umgestalteten. Diese Umgestaltung begann zwischen 1950 und 1960 mit kleinräumigen Neuordnungen. Dabei wurde das Gelände meist in Handarbeit bzw. mit Hilfe betriebseigener Maschinen umgestaltet. In dieser Zeit wurden rund 950 ha von den Flurbereinigungsbehörden flurbereinigt.
Zwischen 1960 und 1970 wurden die Lösshänge umfassender umgestaltet, wobei große, tiefe und möglichst rechteckige Terrassenflächen mit entsprechend hohen Böschungen entstanden. Die Terrassen wurden mit bergseitiger Neigung angelegt, so dass jetzt vom Tal aus vielfach nur noch die Kanten sichtbar sind. Auf diese Art entstanden rund 650 ha Rebfläche.
Mit umfassendem Maschineneinsatz wurden die Großterrassenplanungen der Jahre 1970 bis 1976 umgesetzt, die das Landschaftsbild deutlich veränderten. Vor diesen Maßnahmen zeichneten sich in den sanften Hängen, deren Oberflächen von den kleinen Terrassen überprägt waren, noch die ursprünglich natürlich entstandenen Senken ab. Statt diesem Nebeneinander von natürlichen und vom Menschen geschaffenen Strukturen nehmen die Kritiker nun festungsartige und landschaftsfremde Oberflächen wahr, die eine Gesamtgröße von ca. 630 ha Rebfläche bieten. Da die Böschungen und sonstigen Flächen größer waren als die Rebflächen, erstreckte sich die Landschaftsveränderung jeweils auf mehr als das Doppelte der neu geschaffenen nutzbaren Fläche. Beispiele für diese Phase sind die Flurbereinigungen Oberrotweil-Oberberg, Ihringen-Abtsweingarten, Eichstetten-Hättlinsberg und Endingen am Kaiserstuhl-Schambach. Inzwischen war der Großteil der Lösshohlwege durch die Flurbereinigung verschwunden, die zuvor ökologische Nischen speziell für Wildbienen und Vögel gewesen waren.
Die letzte Phase der Rebflurbereinigung erstreckte sich auf die Zeit zwischen 1976 und 1982, in der unter anderem wegen der Proteste gegen die Großterrassenplanungen gemäßigt vorgegangen wurde: Die Böschungshöhen wurden auf maximal 10 m „beschränkt“, der Böschungsverlauf wurde „geschwungen angelegt und der Landschaft angepasst“. Mit diesen Verfahren wurden zum Beispiel in Oberbergen-Baßgeige oder in Bickensohl-Herrenstück rund 330 ha Rebfläche bearbeitet.
Nachdem ab 1977 durch länger anhaltende niederschlagsreiche Perioden Böschungsschäden entstanden waren, fielen in der Pfingstwoche des Jahres 1983 Niederschlagsmengen, die teilweise ein Drittel des Jahresmittels ausmachten. Diese führten in den umgelegten Gebieten zu Schäden: Die Böschungsoberflächen rutschten vielfach mitsamt der Vegetation ab, ehemalige, durch die Umlegungen verschüttete Talzüge wurden ausgeschwemmt, in einzelnen Terrassen entstanden tiefgreifende Grundbrüche. Überdies kam es in den Folgejahren zu Frostschäden. Durch die bergseitige Neigung der Terrassenoberflächen konnten sich Kaltluftseen bilden, in denen die Reben vor allem in der Blüte erfroren.[6] Außerdem entstanden, vor allem in den niedriger gelegenen Rebflächen, in denen zuvor meist Obst angebaut worden war, erhebliche Frostschäden am Holz der Rebbestände.
Die Tätigkeit der Flurbereinigungsbehörden beschränkte sich in der Zeit nach 1982 auf Reparaturarbeiten und partielle Umplanungen, die zumindest die schwersten Folgen der Umgestaltungen korrigieren sollten. Inzwischen hatte man auch begonnen, die verbliebenen Lösshohlwege als Naturdenkmale auszuweisen und sie zu schützen.
Seit 2021 wird auf einer Fläche von etwa einem Hektar Echter Lavendel und Lavandin angebaut. Dank der Wärme und der kalkreichen Böden gedeiht er gut. Zwei der vier Felder liegen in Bischoffingen, wo es auch einen Hofladen gibt und je eines in Königschaffhausen und Burkheim. Auf letzterem wachsen neun verschiedene Sorten.
Wandern
Der bekannteste und „klassische“ Wanderweg ist der Neunlindenpfad (Nord-Süd-Weg); er ist einer von acht Themenpfaden und führt von Endingen über den Katharinenberg und den Totenkopf mit Aussichtsturm Neunlinden nach Ihringen. Von den Wegen bieten sich vielerorts Ausblicke auf den Schwarzwald, die Rheinebene und die Vogesen. Auch der Querweg Schwarzwald–Kaiserstuhl–Rhein führt über den Kaiserstuhl.
Als Wissenschaftlicher Lehrpfad wurde 1977 der Limberg-Weg angelegt. Er umfasst 90 Stationen zu den Themen Geologie und Mineralogie, Geschichte, Naturschutz und Landschaftspflege, Forstwirtschaft, Wein- und Obstbau, Rheinbau und Wasserwirtschaft, sowie Landeskunde.
Die acht Themenpfade wurden 2007 mit einer Gesamtlänge von 140 km eröffnet und in das bestehende Wanderwegenetz des Schwarzwaldvereins (Markierung: gelber Rhombus auf weißem Hintergrund) integriert. Dabei wurde das Wanderwegenetz mit 430 neuen Wegweisern ausgeschildert. Große Tafeln mit einer Übersichtskarte und mit Standortinformationen sind an zentralen Punkten wie zum Beispiel an Bahnhöfen in den von den Themenpfaden verbundenen oder durchlaufenden Ortschaften aufgestellt. Jeder Themenpfad ist durch eine eigene Farbe und ein dem Namen entsprechendes Symbol auf den Eingangsportalen und den Wegweisern optisch gekennzeichnet. Weitere 120 kleinere Thementafeln erläutern entlang der Wanderwege lokale Besonderheiten. Örtliche Pfade, wie zum Beispiel der Brunnenpfad (7 km) in Bötzingen, wurden in das neue Netz der Themenpfade integriert.
Die acht Themenpfade wurden 2010 durch den Kaiserstuhlpfad ergänzt, der als Prädikatswanderweg das Gütesiegel „Qualitätsweg Wanderbares Deutschland“ erhielt. Der 21,7 km lange Kaiserstuhlpfad orientiert sich mit einigen Erweiterungen am Neunlindenpfad (Nord-Süd-Weg) und führt von Endingen durch das Erletal hoch zur Katharinenkapelle, entlang der Naturschutzgebiete Badberg und Haselschacher Buck zum Eichelspitzturm, weiter über den Vogelsang-Pass zum Neunlindenturm, durch den Lößhohlweg Eichgasse nach Bickensohl und über den Kreuzenbuck durch die Lenzengasse nach Ihringen.
(Wikipedia)
The Red Sea (alternatively Arabian Gulf[1] or Gulf of Arabia[2][3]) is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. In the north, there is the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez (leading to the Suez Canal). The Red Sea is a Global 200 ecoregion. The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley.
The Red Sea has a surface area of roughly 438,000 km² (169,100 mi²).[4][5] It is about 2250 km (1398 mi) long and, at its widest point, 355 km (220.6 mi) wide. It has a maximum depth of 2211 m (7254 ft) in the central median trench, and an average depth of 490 m (1,608 ft). However, there are also extensive shallow shelves, noted for their marine life and corals. The sea is the habitat of over 1,000 invertebrate species, and 200 soft and hard corals. It is the world's northernmost tropical sea.
Extent
The International Hydrographic Organization defines the limits of the Red Sea as follows:[6]
On the North. The Southern limits of the Gulfs of Suez [A line running from Ràs Muhammed (27°43'N) to the South point of Shadwan Island (34°02'E) and thence Westward on a parallel (27°27'N) to the coast of Africa] and Aqaba [A line running from Ràs al Fasma Southwesterly to Requin Island (
27°57′N 34°36′E) through Tiran Island to the Southwest point thereof and thence Westward on a parallel (27°54'N) to the coast of the Sinaï Peninsula].
On the South. A line joining Husn Murad (
12°40′N 43°30′E) and Ras Siyan (
12°29′N 43°20′E).
Name
Red Sea is a direct translation of the Greek Erythra Thalassa (Ερυθρὰ Θάλασσα) and Latin Mare Rubrum (alternatively Sinus Arabicus, literally "Arabian Gulf"), Arabic Al-Baḥr Al-Aḥmar (البحر الأحمر) or Baḥr Al-Qalzam(بحر القلزم), Somali Badda Cas and Tigrinya Qeyyiḥ bāḥrī (ቀይሕ ባሕሪ). The name of the sea may signify the seasonal blooms of the red-coloured Trichodesmium erythraeum near the water's surface.[7] A theory favored by some modern scholars[who?] is that the name red is referring to the direction South, just as the Black Sea's name may refer to North. The basis of this theory is that some Asiatic languages used color words to refer to the cardinal directions.[8] Herodotus on one occasion uses Red Sea and Southern Sea interchangeably.[9]
The association of the Red Sea with the Biblical account of the Israelite Crossing the Red Sea is ancient, and was made explicit in the Septuagint translation of the Book of Exodus from Hebrew to Koine Greek in approximately the third century B.C. In that version, the Hebrew Yam Suph (ים סוף) is translated as Erythra Thalassa (Red Sea). (See also the more recent suggestion that the Yam Suph of the Exodus refers to a Sea of Reeds). The Red Sea is one of four seas named in English after common color terms — the others being the Black Sea, the White Sea and the Yellow Sea. The direct rendition of the Greek Erythra thalassa in Latin as Mare Erythraeum refers to the north-western part of the Indian Ocean, and also to a region on Mars.
History
The earliest known exploration of the Red Sea was conducted by Ancient Egyptians, as they attempted to establish commercial routes to Punt. One such expedition took place around 2500 BC, and another around 1500 BC ( by Hatshepsut ). Both involved long voyages down the Red Sea.[10] The Biblical Book of Exodus tells the story of the Israelites' miraculous crossing of a body of water, which the Hebrew text calls Yam Suph. Yam Suph is traditionally identified as the Red Sea. The account is part of the Israelites' escape from slavery in Egypt. Yam Suph can also been translated as Sea of Reeds.
In the 6th century BC, Darius the Great of Persia sent reconnaissance missions to the Red Sea, improving and extending navigation by locating many hazardous rocks and currents. A canal was built between the Nile and the northern end of the Red Sea at Suez. In the late 4th century BC, Alexander the Great sent Greek naval expeditions down the Red Sea to the Indian Ocean. Greek navigators continued to explore and compile data on the Red Sea. Agatharchides collected information about the sea in the 2nd century BC. The Periplus of the Erythraean Sea ("Periplus of the Red Sea"), a Greek periplus written by an unknown author around the 1st century AD, contain a detailed description of the Red Sea's ports and sea routes.[11] The Periplus also describes how Hippalus first discovered the direct route from the Red Sea to India.
The Red Sea was favored for Roman trade with India starting with the reign of Augustus, when the Roman Empire gained control over the Mediterranean, Egypt, and the northern Red Sea. The route had been used by previous states but grew in the volume of traffic under the Romans. From Indian ports goods from China were introduced to the Roman world. Contact between Rome and China depended on the Red Sea, but the route was broken by the Aksumite Empire around the 3rd century AD.[12]
During the Middle Ages, the Red Sea was an important part of the Spice trade route. In 1513, trying to secure that channel to Portugal, Afonso de Albuquerque laid siege to Aden.[13] but was forced to retreat. They cruised the Red Sea inside the Bab al-Mandab, as the first European fleet to have sailed this waters.
In 1798, France ordered General Bonaparte to invade Egypt and take control of the Red Sea. Although he failed in his mission, the engineer Jean-Baptiste Lepère, who took part in it, revitalised the plan for a canal which had been envisaged during the reign of the Pharaohs. Several canals were built in ancient times from the Nile to the Red Sea along or near the line of the present Sweet Water Canal, but none lasted for long. The Suez Canal was opened in November 1869. At the time, the British, French, and Italians shared the trading posts. The posts were gradually dismantled following the First World War. After the Second World War, the Americans and Soviets exerted their influence whilst the volume of oil tanker traffic intensified. However, the Six Day War culminated in the closure of the Suez Canal from 1967 to 1975. Today, in spite of patrols by the major maritime fleets in the waters of the Red Sea, the Suez Canal has never recovered its supremacy over the Cape route, which is believed to be less vulnerable.
Oceanography
The Red Sea lies between arid land, desert and semi-desert. The main reasons for the better development of reef systems along the Red Sea is because of its greater depths and an efficient water circulation pattern, The Red Sea water mass exchanges its water with the Arabian Sea, Indian Ocean via the Gulf of Aden. These physical factors reduce the effect of high salinity caused by evaporation water in the north and relatively hot water in the south.
The climate of the Red Sea is the result of two distinct monsoon seasons; a northeasterly monsoon and a southwesterly monsoon. Monsoon winds occur because of the differential heating between the land surface and sea. Very high surface temperatures coupled with high salinities makes this one of the hottest and saltiest bodies of seawater in the world. The average surface water temperature of the Red Sea during the summer is about 26 °C (79 °F) in the north and 30 °C (86 °F) in the south, with only about 2 °C (3.6 °F) variation during the winter months. The overall average water temperature is 22 °C (72 °F). Today surface water temperatures remain relatively constant at 21–25 °C (70–77 °F). Temperature and visibility remain good to around 200 m (656 ft). The sea is known for its strong winds and unpredictable local currents.
The rainfall over the Red Sea and its coasts is extremely low, averaging 0.06 m (2.36 in) per year. The rain is mostly in the form of showers of short spells, often associated with thunderstorms and occasionally with dust storms. The scarcity of rainfall and no major source of fresh water to the Red Sea result in the excess evaporation as high as 205 cm (81 in) per year and high salinity with minimal seasonal variation. A recent underwater expedition to the Red Sea offshore from Sudan and Eritrea[14] found surface water temperatures 28 °C in winter and up to 34 °C in the summer, but despite that extreme heat the coral was healthy with much fish life with very little sign of coral bleaching, and there were plans to use samples of these corals' apparently heat-adapted commensal algae to salvage bleached coral elsewhere.
Salinity
The Red Sea is one of the most saline bodies of water in the world, due to high evaporation. Salinity ranges from between ~36 ‰ in the southern part due to the effect of the Gulf of Aden water and reaches 41 ‰ in the northern part, due mainly to the Gulf of Suez water and the high evaporation. The average salinity is 40 ‰. (Average salinity for the world's seawater is ~35 ‰ on the Practical Salinity Scale, or PPS; that translates to 3.5 % actual dissolved salts.)
In terms of salinity, the Red Sea is greater than the world average, approximately 4 percent. This is due to several factors:
1.High rate of evaporation and very little precipitation.
2.Lack of significant rivers or streams draining into the sea.
3.Limited connection with the Indian Ocean, which has lower water salinity.
Tidal range
In general tide ranges between 0.6 m (2.0 ft) in the north, near the mouth of the Gulf of Suez and 0.9 m (3.0 ft) in the south near the Gulf of Aden but it fluctuates between 0.20 m (0.66 ft) and 0.30 m (0.98 ft) away from the nodal point. The central Red Sea (Jeddah area) is therefore almost tideless, and as such the annual water level changes are more significant. Because of the small tidal range the water during high tide inundates the coastal sabkhas as a thin sheet of water up to a few hundred metres rather than inundating the sabkhas through a network of channels. However, south of Jeddah in the Shoiaba area the water from the lagoon may cover the adjoining sabkhas as far as 3 km (2 mi) whereas, north of Jeddah in the Al-kharrar area the sabkhas are covered by a thin sheet of water as far as 2 km (1.2 mi). The prevailing north and northeastern winds influence the movement of water in the coastal inlets to the adjacent sabkhas, especially during storms. Winter mean sea level is 0.5 m (1.6 ft) higher than in summer. Tidal velocities passing through constrictions caused by reefs, sand bars and low islands commonly exceed 1–2 m/s (3–6.5 ft/s). Coral reefs in the Red Sea are near Egypt, Saudi Arabia, Israel and Sudan.
Current
In the Red Sea detailed current data is lacking, partially because they are weak and variable both spatially and temporally. Temporal and spatial currents variation is as low as 0.5 m (1.6 ft) and are governed all by wind. During the summer, NW winds drive surface water south for about four months at a velocity of 15–20 cm/s (6–8 in/s), whereas in winter the flow is reversed resulting in the inflow of water from the Gulf of Aden into the Red Sea. The net value of the latter predominates, resulting in an overall drift to the northern end of the Red Sea. Generally, the velocity of the tidal current is between 50–60 cm/s (20–23.6 in/s) with a maximum of 1 m/s (3.3 ft) at the mouth of the al-Kharrar Lagoon. However, the range of the north-northeast current along the Saudi coast is 8–29 cm/s (3–11.4 in/s).
Wind regime
With the exception of the northern part of the Red Sea, which is dominated by persistent north-west winds, with speeds ranging between 7 km/h (4.3 mph) and 12 km/h (7.5 mph), the rest of the Red Sea and the Gulf of Aden are subjected to the influence of regular and seasonally reversible winds. The wind regime is characterized by both seasonal and regional variations in speed and direction with average speed generally increasing northward.
Wind is the driving force in the Red Sea for transporting the material either as suspension or as bedload. Wind induced currents play an important role in the Red Sea in initiating the process of resuspension of bottom sediments and transfer of materials from sites of dumping to sites of burial in quiescent environment of deposition. Wind generated current measurement is therefore important in order to determine the sediment dispersal pattern and its role in the erosion and accretion of the coastal rock exposure and the submerged coral beds.
Geology
The Red Sea was formed by Arabia splitting from Africa due to movement of the Red Sea Rift. This split started in the Eocene and accelerated during the Oligocene. The sea is still widening and it is considered that the sea will become an ocean in time (as proposed in the model of John Tuzo Wilson). In 1949, a deep water survey reported anomalously hot brines in the central portion of the Red Sea. Later work in the 1960s confirmed the presence of hot, 60 °C (140 °F), saline brines and associated metalliferous muds. The hot solutions were emanating from an active subseafloor rift. The highly saline character of the waters was not hospitable to living organisms.[15]
Sometimes during the Tertiary period the Bab el Mandeb closed and the Red Sea evaporated to an empty hot dry salt-floored sink. Effects causing this would be:
•A "race" between the Red Sea widening and Perim Island erupting filling the Bab el Mandeb with lava.
•The lowering of world sea level during the Ice Ages due to much water being locked up in the ice caps.
A number of volcanic islands rise from the center of the sea. Most are dormant, but in 2007 Jabal al-Tair island, in the Bab el Mandeb strait, erupted violently. An eruption among the nearby Zubair islands followed in 2011.[16]
Mineral resources
In terms of mineral resources the major constituents of the Red Sea sediments are as follows:
•Biogenic constituents:
Nanofossils, foraminifera, pteropods, siliceous fossils
•Volcanogenic constituents:
Tuffites, volcanic ash, montmorillonite, cristobalite, zeolites
•Terrigenous constituents:
Quartz, feldspars, rock fragments, mica, heavy minerals, clay minerals
•Authigenic minerals:
Sulfide minerals, aragonite, Mg-calcite, protodolomite, dolomite, quartz, chalcedony.
•Evaporite minerals:
Magnesite, gypsum, anhydrite, halite, polyhalite
•Brine precipitate:
Fe-montmorillonite, goethite, hematite, siderite, rhodochrosite, pyrite, sphalerite, anhydrite.
Living resources
The Red Sea is a rich and diverse ecosystem. More than 1200 species of fish[17] have been recorded in the Red Sea, and around 10% of these are found nowhere else.[18] This also includes 42 species of deepwater fish.[17]
The rich diversity is in part due to the 2,000 km (1,240 mi) of coral reef extending along its coastline; these fringing reefs are 5000–7000 years old and are largely formed of stony acropora and porites corals. The reefs form platforms and sometimes lagoons along the coast and occasional other features such as cylinders (such as the Blue Hole (Red Sea) at Dahab). These coastal reefs are also visited by pelagic species of red sea fish, including some of the 44 species of shark.
The Red Sea also contains many offshore reefs including several true atolls. Many of the unusual offshore reef formations defy classic (i.e., Darwinian) coral reef classification schemes, and are generally attributed to the high levels of tectonic activity that characterize the area.
The special biodiversity of the area is recognized by the Egyptian government, who set up the Ras Mohammed National Park in 1983. The rules and regulations governing this area protect local marine life, which has become a major draw for diving enthusiasts.
Divers and snorkellers should be aware that although most Red Sea species are innocuous, a few are hazardous to humans: see Red Sea species hazardous to humans.[19]
Other marine habitats include sea grass beds, salt pans, mangroves and salt marshes.
Desalination plants
There is extensive demand of desalinated water to meet the requirement of the population and the industries along the Red Sea.
There are at least 18 desalination plants along the Red Sea coast of Saudi Arabia which discharge warm brine and treatment chemicals (chlorine and anti-scalants) that may cause bleaching and mortality of corals and diseases to the fish stocks. Although this is only a localized phenomenon, it may intensify with time and have a profound impact on the fishing industry.[20]
The water from the Red Sea is also utilized by oil refineries and cement factories for cooling purposes. Used water drained back into the coastal zones may cause harm to the nearshore environment of the Red Sea.
Security
The Red Sea is part of the sea roads between Europe, the Persian Gulf and East Asia, and as such has heavy shipping traffic. Piracy in Somalia occurs principally near the area of the Gulf of Aden south of the sea. Government-related bodies with responsibility to police the Red Sea area include the Port Said Port Authority, Suez Canal Authority and Red Sea Ports Authority of Egypt, Jordan Maritime Authority, Israel Port Authority, Saudi Ports Authority and Sea Ports Corporation of Sudan.
Facts and figures
•Length: ~2,250 km (1,398.1 mi) - 79% of the eastern Red Sea with numerous coastal inlets
•Maximum Width: ~ 306–355 km (190–220 mi)– Massawa (Eritrea)
•Minimum Width: ~ 26–29 km (16–18 mi)- Bab el Mandeb Strait (Yemen)
•Average Width: ~ 280 km (174.0 mi)
•Average Depth: ~ 490 m (1,607.6 ft)
•Maximum Depth: ~2,211 m (7,253.9 ft)
•Surface Area: 438-450 x 10² km² (16,900–17,400 sq mi)
•Volume: 215–251 x 10³ km³ (51,600–60,200 cu mi)
•Approximately 40% of the Red Sea is quite shallow (under 100 m/330 ft), and about 25% is under 50 m (164 ft) deep.
•About 15% of the Red Sea is over 1,000 m (3,300 ft) depth that forms the deep axial trough.
•Shelf breaks are marked by coral reefs
•Continental slope has an irregular profile (series of steps down to ~500 m/1,640 ft)
•Centre of Red Sea has a narrow trough (~ 1,000 m/3,281 ft; some deeps may exceed 2,500 m/8,202 ft)
Tourism
The sea is known for its spectacular recreational diving sites, such as Ras Mohammed, SS Thistlegorm (shipwreck), Elphinstone, The Brothers, Dolphin Reef and Rocky Island in Egypt and less known sites in Sudan such as Sanganeb, Abington, Angarosh and Shaab Rumi.
The Red Sea became known as a sought-after diving destination after the expeditions of Hans Hass in the 1950s, and later by Jacques-Yves Cousteau. Popular tourist resorts include El Gouna, Hurghada, Safaga, Marsa Alam, on the western shore of the Red Sea, and Sharm-El-Sheikh, Dahab, and Taba on the Egyptian side of Sinaï, as well as Aqaba in Jordan and Eilat in Israel in an area known as the Red Sea Riviera.
The popular tourist beach of Sharm el-Sheikh was closed to all swimming in December 2010 due to several serious shark attacks, including one fatal one. As of December 2010, scientists are investigating the attacks and have identified, but not verified, several possible causes including over fishing which causes large sharks to hunt closer to shore, tourist boat operators who chum the waters just offshore to present shark-photo opportunities, and reports of passing ships throwing dead livestock overboard. Furthermore the geography of some parts of the Red Sea is such that large sharks can sometimes wander close to shore. This is due to the sea's narrow width, significant depth, and sharp drop-offs, all of which combine to form a geography where large deep-water sharks can roam in hundreds of meters of water, yet be within a hundred meters of swimming areas.
Bordering countries
The Red Sea may be geographically divided into three sections: the Red Sea proper, and in the north, the Gulf of Aqaba and the Gulf of Suez. The six countries bordering the Red Sea proper are:
•Eastern shore:
o Saudi Arabia
o Yemen
•Western shore:
o Egypt
o Sudan
o Eritrea
o Djibouti
The Gulf of Suez is entirely bordered by Egypt. The Gulf of Aqaba borders Egypt, Israel, Jordan and Saudi Arabia.
In addition to the standard geographical definition of the six countries bordering the Red Sea cited above, areas such as Somalia and Ethiopia are sometimes also described as Red Sea territories. This is primarily due to their proximity to and geological similarities with the nations facing the Red Sea and/or political ties with said areas.[21][22]
Towns and cities
Towns and cities on the Red Sea coast (including the coasts of the Gulfs of Aqaba and Suez) include:
• Al Hudaydah (الحديدة)
• Al Lith (الليِّث)
• Al Qunfudhah (القنفذة)
• Al-Qusair (القصير)
• Al Wajh (الوجه)
• Aqaba (العقبة)
• Asseb (ዓሳብ)
• Dahab (دهب)
• Duba (ضباء)
• Eilat (אילת)
• El Gouna (الجونة)
• El Suweis (السويس)
• / Hala'ib (حلايب) (disputed)
• Haql (حقل)
• Hirgigo (ሕርጊጎ)
• Hurghada (الغردقة)
• Jeddah (جدة)
• Jazan (جازان)
• Marsa Alam (مرسى علم)
• Massawa (ምጽዋ)
• Nuweiba (نويبع)
• Port Safaga (ميناء سفاجا)
• Port Sudan (بورت سودان)
• Rabigh (رابغ)
• Sharm el Sheikh (شرم الشيخ)
• Soma Bay (سوما باي)
• Suakin (سواكن)
• Taba (طابا)
• Thuwal (ثول)
• Yanbu (ينبع)
Scolecite. The mineral, one of the zeolite group, is a hydrated calcium aluminum silicate. Elk Mountain. Rose Valley, Cowlitz Co., Washington.
Analcime on Chabazite-Ca. Analcime is a hydrated sodium aluminum silicate. Chabazite-Ca is a hydrated calcium aluminum silicate. Southeast Quarry. North Table Mountain. Golden, Jefferson Co., Colo.