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Eine Fumarole im Stefanoskrater auf der Insel Nisyros
Mehr Information unter: www.wanderstudienreisen.com & www.volcanodiscovery.com
Fumarole is Latin for chimney. Though the topography of the volcano is changing all the time, when we visited here this had the most smoke pouring out of it constantly.
Fumaroles are the steam vents where gasses and minerals come up to the
surface. The minerals hardened the rock. So when the rest of the
rock eroded, the rock surrounding the fumaroles remained.
From the nice information sign:
"The history of the strange rock formations in front of you began about 7,700 years ago when the eruptions of Mt. Mazama were reaching their climax. Torrents of red-hot, gas-charged pumice poured down Mazama's slopes at speeds of up to 100mph (160kph). On top of this came a flow of heavier rocks called scoria. These glowing avalanches flooded downslope for many miles, leaving deep deposits in their wake.
"Temperatures in the deposits may have exceeded 750F (400C). Plumes of vapors appeared, as gasses escaped from the settling rocks through vents called fumaroles. Minerals in the gasses, combined with extreme heat, welded the sides of the fumaroles in the shape of slender cones. Since then, Annie Creek has eroded a canyon through the deposits, exposing the fossil fumaroles as pinnacles and columns.
"The depth of the canyon here at Godfrey Glen is about 250 feet (75m)."
Nps.gov: Along Fountain Paint Pot Trail you will see various hydrothermal features that are expressions of Yellowstone’s still active volcano. Within this geologic system, each type of thermal feature is represented. They can be grouped into two general categories—those with a great deal of water (hot springs and geysers) and those with limited water (mudpots and fumaroles). Despite their structural similarities, no two features are exactly alike:
Silex Spring, Fountain Paint Pot, Red Spouter, Fumaroles, Twig Geyser, Fountain Geyser, Morning Geyser, Jet Geyser, Spasm Geyser, Clepsydra Geyser, Jelly Geyser.
Notes: Thermal activity throughout this entire area. Stay on the boardwalk at all times.
1452a
Steamboat Geyser, Back Basin, Norris Geyser Basin, Yellowstone National Park, Wyoming, USA.
Yellowstone National Park is known for its variety of wildlife and - even more - for its many geothermal features like geysers, fumaroles, hot springs etc., the best known of them being the geyser "Old Faithful". Yellowstone National Park is said to be the first National Park of the World. It is inscribed in the World Heritage List of the UNESCO.
---quotation from whc.unesco.org:---
Yellowstone National Park, established in 1872, covers 9,000 km2 of a vast natural forest of the southern Rocky Mountains in the North American west. It boasts an impressive array of geothermal phenomena, with more than 3,000 geysers, lava formations, fumaroles, hot springs and waterfalls, lakes and canyons. It is equally known for its wildlife: grizzly bears, bison, wolves and wapiti, North American elk.
The park is part of the most seismically active region of the Rocky Mountains, a volcanic 'hot spot'. The Yellowstone Plateau, now a forested area of 650,000 ha with an average elevation of 2,000 m, was formed out of the accumulation of rhyolite magma. The plateau is flanked on the north, east and south by mountains that rise to 4,000 m. Crustal uplifts 65 million years ago raised blocks of crust to form the southern Rocky Mountains. After that, volcanic outflows of andesitic composition were common to about 40 million years ago. Andesitic ashflows and mudflows of the Eocene age covered forests, which became petrified. Some 200 species of petrified plant have been found. A more recent period of rhyolitic volcanism began in the region about 2 million years ago, during which time thousands of cubic kilometres of rhyolitic magma filled immense chambers under the plateau and then erupted to the surface. Three cycles of eruption produced huge explosive outbursts of ash. The latest eruptive cycle formed a caldera 45 km wide and 75 km long, when the active magma chambers erupted and collapsed. The crystallizing magma is the source of heat for hydrothermal features such as geysers, hot springs, mud pots and fumaroles.
Yellowstone contains 200-250 active geysers and perhaps 10,000 thermal features. Most of the area was glaciated during the Pleistocene and many glacial features remain. The park lies at the headwaters of three major rivers. Yellowstone River is a major tributary of the Missouri River that flows via the Mississippi to the Gulf of Mexico. Firehole and Gibbon rivers unite to form the Madison, which also joins the Missouri. Snake River arises near the park's south boundary and joins the Columbia to flow into the Pacific. Yellowstone Lake is the largest lake at high elevation (2,357 m) in North America. Lower Yellowstone Falls is the highest of more than 40 named waterfalls in the park.
---end of quotation---
USA tour September 2006
Turrialba Volcano is named after the region of Costa Rica in which the volcano is situated in Turrialba County, Cartago of Costa Rica. The stratovolcano is 3,340 m (10,958 ft) high and is about 45 minutes from the Atlantic slope town of Turrialba. The summit has three craters, one of which has fumaroles and sulfur pits.
New Zealand's most active marine volcano - geothermal activity, roaring steam vents and fumaroles, bubbling mud pits, hot volcanic streams and lake of steaming acid. Vivid hues of yellow and orange from abundant sulphur. Remains of a sulphur mining factory destroyed by a lahar in 1914 killing 10 miners
Turrialba Volcano is named after the region of Costa Rica in which the volcano is situated in Turrialba County, Cartago of Costa Rica. The stratovolcano is 3,340 m (10,958 ft) high and is about 45 minutes from the Atlantic slope town of Turrialba. The summit has three craters, one of which has fumaroles and sulfur pits.
at sunrise
scanned slide
of interest - www.adventuresnw.com/when-mount-baker-erupts-a-cautionary...
my lichen photos by genus - www.flickr.com/photos/29750062@N06/collections/7215762439...
my photos arranged by subject, e.g. mountains - www.flickr.com/photos/29750062@N06/collections
Mud flows from the Fountain Paint Pots have gradually overcome tree lines in certain pockets of the NP.
Fountain Paint Pot trail, Yellowstone National Park, Wyoming, USA :
This part of Lower Geyser Basin seen from a half-mile trail has all four of the hydrothermal features found in the park:
Clepsydra Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park. Clepsydra plays nearly continuously to heights of 45 feet. The name Clepsydra is derived from the Greek word for water clock. Prior to the 1959 Hebgen Lake earthquake, it erupted regularly every three minutes.
Yellowstone National Park has several hydrothermal areas, so what makes the Fountain Paint Pot Area worth visiting? For starters, this part of Lower Geyser Basin has all four of the hydrothermal features found in the park (mudpots, geysers, hot springs, and fumaroles) and you can see them all from a compact half-mile long boardwalk loop. While none of the many Fountain Paint Pot Area geysers are as famous as Old Faithful, they erupt so frequently that you are almost guaranteed a great show on your short hike. Since the walkway passes all four of Yellowstone’s hydrothermal formations, the hike comes with a guaranteed lesson in hydrothermal volcanism.
Hiking the loop in a clockwise direction, you will first pass through a forest of lodgepole pine snags that were drowned and left lifeless by the surrounding hot springs. As you approach the northwest end of the loop, you will spot a lively collection of geysers. Clepsydra Geyser, Fountain Geyser, Jelly Geyser, Jet Geyser, Morning Geyser, Spasm Geyser, and Twig Geyser erupt with various levels of regularity.
As you progress around the walkway toward the northeast corner, you will pass Red Spouter, which behaves like a fumarole, a hot spring, and a mudpot throughout the year. It is like a hot spring in the winter, a muddy reddish pool in the spring and a steaming fumarole in the drier summer and fall. Wrapping down the east side of the boardwalk, you will pass Leather Pool and a slope of fumaroles. These gaps in the surface whistle and hiss as gasses and steam escape from the ground. Just below the fumaroles, where a little more water is present, the trail circles Fountain Paint Pot. These mudpots bubble and pop as globs of mud springs from the surface like miniature trapeze artists.
Continuing downhill, the hydrothermal features become even wetter as you arrive at Silex Spring. Look down into the small blue pool rimmed with white silica. Water spills over the sides of the spring creating an orange-colored surface covered in rippling runoff. These colors are created by thermophiles, heat-loving microorganisms that live in Yellowstone’s hot springs.
( www.hikespeak.com/trails/fountain-paint-pot-trail-yellows... )
Geothermal features of Yellowstone NP- A brief note:
There are four geothermal features found in the park – Hot springs, Geysers, Fumaroles , and Mud volcanoes/pots.
What is a Hot spring?
Hot spring, also called thermal spring, spring with water at temperatures substantially higher than the air temperature of the surrounding region. Most hot springs discharge groundwater that is heated by shallow intrusions of magma (molten rock) in volcanic areas.
Some thermal springs, however, are not related to volcanic activity. In general, the temperature of rocks within the earth increases with depth. The rate of temperature increase with depth is known as the geothermal gradient. In such cases, the water is heated by convective circulation: groundwater percolating downward reaches depths of a kilometre or more where the temperature of rocks is high because of the normal temperature gradient of the Earth’s crust—about 30 °C / kilometer in the first 10 km. The water from hot springs in non-volcanic areas is heated in this manner.
But in active volcanic zones such as Yellowstone National Park, water may be heated by coming into contact with magma (molten rock). The high temperature gradient near magma may cause water to be heated enough that it boils or becomes superheated. If the water becomes so hot that it builds steam pressure and erupts in a jet above the surface of the Earth, it is called a geyser.
[ Warm springs are sometimes the result of hot and cold springs mixing. They may occur within a volcanic area or outside of one. One example of a non-volcanic warm spring is Warm Springs, Georgia (frequented for its therapeutic effects by paraplegic U.S. President Franklin D. Roosevelt, who built the Little White House there) ].
List of hot springs:
[ en.wikipedia.org/wiki/List_of_hot_springs ]
The science of colors of a hot spring:
[ ttps://www.britannica.com/science/hot-spring]
Many of the colours in hot springs are caused by thermophilic (heat-loving) microorganisms, which include certain types of bacteria, such as cyanobacteria, and species of archaea and algae. Many thermophilic organisms grow in huge colonies called mats that form the colourful scums and slimes on the sides of hot springs. The microorganisms that grow in hot springs derive their energy from various chemicals and metals; potential energy sources include molecular hydrogen, dissolved sulfides, methane, iron, ammonia, and arsenic. In addition to geochemistry, the temperature and pH of hot springs play a central role in determining which organisms inhabit them.
Examples of thermophilic microorganisms found in hot springs include bacteria in the genera Sulfolobus, which can grow at temperatures of up to 90 °C (194 °F), Hydrogenobacter, which grow optimally at temperatures of 85 °C (185 °F), and Thermocrinis, which grow optimally at temperatures of 80 °C (176 °F). Thermophilic algae in hot springs are most abundant at temperatures of 55 °C (131 °F) or below.
What is a Geyser?
A geyser is formed when water collecting below the surface is heated by a magma source. When the water boils, it rises to the surface. If the water has an unobstructed path, it will pool on the surface in the form of a steaming hot springs. If the passage of the water is imposed upon, the pressure will increase. When the pressure becomes too great, the water converts into to steam. Steam takes up 1,500 times the volume of water, and at this point, the pressure becomes so intense that the steam and surrounding water droplets shoot out of the ground in geyser form, erupting until the pressure has abated and the process starts all over again.
What is a fumarole?
It’s a vent in the Earth’s surface from which steam and volcanic gases are emitted. The major source of the water vapour emitted by fumaroles is groundwater heated by bodies of magma lying relatively close to the surface. Carbon dioxide, sulfur dioxide, and hydrogen sulfide are usually emitted directly from the magma. Fumaroles are often present on active volcanoes during periods of relative quiet between eruptions.
Fumaroles are closely related to hot springs and geysers. In areas where the water table rises near the surface, fumaroles can become hot springs. A fumarole rich in sulfur gases is called a solfatara; a fumarole rich in carbon dioxide is called a mofette. If the hot water of a spring only reaches the surface in the form of steam, it is called a fumarole. [ www.britannica.com/science/fumarole ]
What is a mud volcano/ mud pot/ paint pot?
Usually mud volcanoes are created by hot-spring activity where large amounts of gas and small amounts of water react chemically with the surrounding rocks and form a boiling mud.
Geo-chemistry of mud volcano: Hydrogen sulfide gas rising from magma chamber, as in Yellowstone’s, causes the rotten-egg smell. Microorganisms, or thermophiles, use this gas as a source of energy, and then help turn the gas into sulfuric acid. The acid then breaks down the rocks and soil into mud. Many of the colors seen are vast communities of thermophiles, but some of the yellow is pure sulfur. When iron mixes with sulfur to form iron sulfide, gray and black swirls sometimes appear in the mud (From description of the display board in the park).
If the water of a hot spring is mixed with mud and clay, it is called a mud pot. Variations are the porridge pot (a basin of boiling mud that erodes chunks of the surrounding rock) and the paint pot (a basin of boiling mud that is tinted yellow, green, or blue by minerals from the surrounding rocks).
There are other mud volcanoes, entirely of a nonigneous origin, occur only in oil-field regions that are relatively young and have soft, unconsolidated formations.
Sources: [ www.britannica.com/science/mud-volcano ], and display boards of the YNP.
The Fountain Paint Pot geyser basin is the site of several fumaroles, mud pots, and geysers, including its eponymous feature.
Fumarole Bay in Lake Rotomahana. Surface rock temperatures between 40-70 degrees Celcius. A hydrothermal eruption in 1951 sent a 1.5m wave across the lake. Waimangu volcanic valley, caused by the eruption on 10 June 1886, Rotorua North Island New Zealand 2013
Pump Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA.
Yellowstone National Park is known for its variety of wildlife and - even more - for its many geothermal features like geysers, fumaroles, hot springs etc., the best known of them being the geyser "Old Faithful". Yellowstone National Park is said to be the first National Park of the World. It is inscribed in the World Heritage List of the UNESCO.
---quotation from whc.unesco.org:---
Yellowstone National Park, established in 1872, covers 9,000 km2 of a vast natural forest of the southern Rocky Mountains in the North American west. It boasts an impressive array of geothermal phenomena, with more than 3,000 geysers, lava formations, fumaroles, hot springs and waterfalls, lakes and canyons. It is equally known for its wildlife: grizzly bears, bison, wolves and wapiti, North American elk.
The park is part of the most seismically active region of the Rocky Mountains, a volcanic 'hot spot'. The Yellowstone Plateau, now a forested area of 650,000 ha with an average elevation of 2,000 m, was formed out of the accumulation of rhyolite magma. The plateau is flanked on the north, east and south by mountains that rise to 4,000 m. Crustal uplifts 65 million years ago raised blocks of crust to form the southern Rocky Mountains. After that, volcanic outflows of andesitic composition were common to about 40 million years ago. Andesitic ashflows and mudflows of the Eocene age covered forests, which became petrified. Some 200 species of petrified plant have been found. A more recent period of rhyolitic volcanism began in the region about 2 million years ago, during which time thousands of cubic kilometres of rhyolitic magma filled immense chambers under the plateau and then erupted to the surface. Three cycles of eruption produced huge explosive outbursts of ash. The latest eruptive cycle formed a caldera 45 km wide and 75 km long, when the active magma chambers erupted and collapsed. The crystallizing magma is the source of heat for hydrothermal features such as geysers, hot springs, mud pots and fumaroles.
Yellowstone contains 200-250 active geysers and perhaps 10,000 thermal features. Most of the area was glaciated during the Pleistocene and many glacial features remain. The park lies at the headwaters of three major rivers. Yellowstone River is a major tributary of the Missouri River that flows via the Mississippi to the Gulf of Mexico. Firehole and Gibbon rivers unite to form the Madison, which also joins the Missouri. Snake River arises near the park's south boundary and joins the Columbia to flow into the Pacific. Yellowstone Lake is the largest lake at high elevation (2,357 m) in North America. Lower Yellowstone Falls is the highest of more than 40 named waterfalls in the park.
---end of quotation---
USA tour September 2006
At the foothills of this spectacular volcanic mountain is an expanse of hot springs called Hveraröndor Hverir that are known for their changing variety. You may also find a number of fumaroles, mud pools and mud pots that all seem to be boiling with relentless energy. The pass Námaskarð is strategically located at a short distance from the Krafla volcano system as well as other interesting geological spots like Búrfellshraun and the desert Mývatsöræfi.
Námaskarð earns its notoriety chiefly because of its sulphurous mud springs called solfataras and steam springs called fumaroles. Though you will scarcely find any pure water spring in this wonderful geothermal site of Iceland, the beauty of the colorful minerals defies all comparisons. The gigantic size of the mud craters is what makes you go ‘wow’ at the sight of them.
The other thing that is sure to strike you about Námaskarð is the sheer lack of vegetation. However, if you give a thought to the high temperature range, it does not appear an impossibility altogether. The constant emission of the fumes has made the ground utterly sterile and acidic, unfit to sustain any floras and faunas. You must bear in mind that the fumes can be harmful for humans as well.
A fumarole (Latin fumus, smoke) is an opening in a planet's crust, often in the neighborhood of volcanoes, which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide. The steam is created when superheated water turns to steam as its pressure drops when it emerges from the ground. The name solfatara, from the Italian solfo, sulfur (via the Sicilian dialect), is given to fumaroles that emit sulfurous gases.
Artists Paintpots, Yellowstone National Park, Wyoming, USA.
Yellowstone National Park is known for its variety of wildlife and - even more - for its many geothermal features like geysers, fumaroles, hot springs etc., the best known of them being the geyser "Old Faithful". Yellowstone National Park is said to be the first National Park of the World. It is inscribed in the World Heritage List of the UNESCO.
---quotation from whc.unesco.org:---
Yellowstone National Park, established in 1872, covers 9,000 km2 of a vast natural forest of the southern Rocky Mountains in the North American west. It boasts an impressive array of geothermal phenomena, with more than 3,000 geysers, lava formations, fumaroles, hot springs and waterfalls, lakes and canyons. It is equally known for its wildlife: grizzly bears, bison, wolves and wapiti, North American elk.
The park is part of the most seismically active region of the Rocky Mountains, a volcanic 'hot spot'. The Yellowstone Plateau, now a forested area of 650,000 ha with an average elevation of 2,000 m, was formed out of the accumulation of rhyolite magma. The plateau is flanked on the north, east and south by mountains that rise to 4,000 m. Crustal uplifts 65 million years ago raised blocks of crust to form the southern Rocky Mountains. After that, volcanic outflows of andesitic composition were common to about 40 million years ago. Andesitic ashflows and mudflows of the Eocene age covered forests, which became petrified. Some 200 species of petrified plant have been found. A more recent period of rhyolitic volcanism began in the region about 2 million years ago, during which time thousands of cubic kilometres of rhyolitic magma filled immense chambers under the plateau and then erupted to the surface. Three cycles of eruption produced huge explosive outbursts of ash. The latest eruptive cycle formed a caldera 45 km wide and 75 km long, when the active magma chambers erupted and collapsed. The crystallizing magma is the source of heat for hydrothermal features such as geysers, hot springs, mud pots and fumaroles.
Yellowstone contains 200-250 active geysers and perhaps 10,000 thermal features. Most of the area was glaciated during the Pleistocene and many glacial features remain. The park lies at the headwaters of three major rivers. Yellowstone River is a major tributary of the Missouri River that flows via the Mississippi to the Gulf of Mexico. Firehole and Gibbon rivers unite to form the Madison, which also joins the Missouri. Snake River arises near the park's south boundary and joins the Columbia to flow into the Pacific. Yellowstone Lake is the largest lake at high elevation (2,357 m) in North America. Lower Yellowstone Falls is the highest of more than 40 named waterfalls in the park.
---end of quotation---
USA tour September 2006