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Look up fumarole in Wiktionary, the free dictionary.

Fumaroles on Mount Redoubt in Alaska

A fumarole at Halema`uma`u crater

Fumarole at Námafjall, Iceland

Sampling gases at a fumarole on Mount Baker in Washington, United States

Fumaroles at Vulcano, Sicily

A fumarole (or fumerole – the word ultimately comes from the Latin fumus, "smoke") is an opening in a planet's crust, often in areas surrounding volcanoes, which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide. The steam forms when superheated water condenses as its pressure drops when it emerges from the ground. The name solfatara, from the Italian solfo, "sulfur" (via the Sicilian language – compare to the volcano Solfatara), is given to fumaroles that emit sulfurous gases.

Fumaroles may occur along tiny cracks or long fissures, in chaotic clusters or fields, and on the surfaces of lava flows and of thick deposits of pyroclastic flows. A fumarole field is an area of thermal springs and gas vents where magma or hot igneous rocks at shallow depth release gases or interact with groundwater.^[1] When they occur in freezing environments, fumaroles may cause fumarolic ice towers.

Fumaroles may persist for decades or centuries if located above a persistent heat source; or they may disappear within weeks to months if they occur atop a fresh volcanic deposit that quickly cools. The Valley of Ten Thousand Smokes, for example, was formed during the 1912 eruption of Novarupta in Alaska. Initially, thousands of fumaroles occurred in the cooling ash from the eruption, but over time most of them have become extinct.

An estimated four thousand fumaroles exist within the boundaries of Yellowstone National Park in the United States. In April 2006 fumarole emissions killed three ski-patrol workers east of Chair 3 at Mammoth Mountain Ski Area in California. The workers were overpowered by toxic fumes (a mazuku) that had accumulated in a crevasse they had fallen into.^[2] Another example is an array of fumaroles in the Valley of Desolation in Morne Trois Pitons National Park in Dominica.

Fumaroles emitting sulfurous vapors form surface deposits of sulfur-rich minerals; places in which these deposits have been mined include:

• 
  Kawah Ijen and Arjuno-Welirang, Indonesia


• 
  Purico Complex^[3] near San Pedro de Atacama in Chile


• 
  Xingyang in Henan province, China


• 
  Mt Tongariro in the central North Island, New Zealand


• 
  White Island in the Bay of Plenty, New Zealand (mined from the 1880s to the 1930s)

On Mars

The formation called Home Plate at Gusev Crater on Mars, which was examined by the Mars Exploration Rover (MER) Spirit, is suspected to be the eroded remains of an ancient and extinct fumarole.^[4]

See also

• Boiling Lake


• Mazuku


• Mofetta


• Mudpot


• Mud volcano

References

External links

Wikimedia Commons has media related to Fumaroles.

• USGS Photo Glossary: Fumarole


• Sulfur Mining on Gunung Welirang Volcano


• 
   Chisholm, Hugh, ed. (1911). "Fumarole". Encyclopædia Britannica. 11 (11th ed.). Cambridge University Press. pp. 300–301.