Fumerolle

A fumerolle (indifferently spelled fumerole ) is by definition a crack or a hole of origin Volcanique emanating from the volcanic Gaz and the volcanic biogenic salts. In general, this word can apply to any source of vapor, gas and volatile elements of volcanic origin.

Geology

" is called; fumerolle" all active Phenomenon paravolcanic from where escape from gases. But several phenomena of this type are allotted to the fumerolles, in particular the Solfatare S, some hot sources, or simply the combustion of carbonic gases resulting from the volcanic eruptions. Most of the time, the fumerolles are made up of Soufre and these derivatives, in particular the sulfur dioxide, the sulphuric acid and the Sulfur dioxide. One finds there in particular carbonic gases, in particular the Carbon dioxide. Significant amounts of Steam also enter the composition. Other geological elements play a part during the formation of a fumerolle: magnesium chloride, fluorine, oxide iron… The temperature of the fumerolles in degrees Celsius goes from 100° to more 500°. The more active the volcano is, the more the temperature of the fumerolle increases, like its sulfurous acidity and its components. Certain hot sources are called fumerolles, because of the vapor and gas degasification which escapes from it. Around some fumerolles creates for themselves flowing mineral deposits, in particular of sulfur. Around certain sulfur springs and hot sources, solid sulfur deposits can be formed little by little, crystallizing that Ci.

Geography

The fumerolles are in almost all the zones of active volcanicity. This list shows the places or one can find the greatest concentrations of these demonstrations.

With the National park of Yellowstone (the United States)
the Kamtchatka in Russia (fire girdles)
the Geysers del Tatio with the Chile (fire girdles)
In Iceland
On the island of St Lucia
In the volcanic zones of the Vallée of the great rift (Lac Turkana, Erta Ale Arranges…)
In the north of the Japan (fire girdles)
With the Furnas (the Azores)
In the National park of Lassen Volcanic (the United States)
Stemboat springs in California
In the area Yangmingshan with Taiwan (fire girdles)
In Turkey and Greece
In all the volcanic zone of the Alaska (fire girdles)
In the majority of the active volcanos of the Central America (Poás, Irazú, El Chich3on…) (fire girdles)
Argentine
Bolivia
In will caldeira of Kamojang
Sumatra
New Guinea-News-Guinea
Champs Phlégréens in Italy
Hawaii
In the Antarctic close to the Mont Erebus.
At the bottom of the crater of the volcano Mahawu, in Sulawesi, where they are accompanied by ponds by muds, small geyser and an acid lake.

This list is not exhaustive since that if shows only the principal places of demonstrations of fumerolles, the fumerolles being able to be in almost all the active volcanic zones of the sphere.

Composition

The fumerolles are made up of several gas elements, in particular it:

Sulfur (sulphuric Sulfur dioxide, Acid…)
Carbon dioxide
Steam

These volatile elements come especially from the composition of the Magma.

Role of the fumerolles in the volcanologic Prediction

The fumerolles and the Solfatare S play a big role in the census of the activity of a Volcan. When a volcano enters a phase of increased activity, the number, the temperature and the acidity of the fumerolles increase around this one. The increase of the burning Lave in the magmatic Chambre causes the important degasifications represented as a fumerolles. At the time of censuses of activity of certain volcanos, the Volcanologue S sample the deposits of the fumerolles and use Thermocouple S to measure their temperature. The quantity of sulfur poured by the fumerolle indicates also the activity of the volcano, a volcano rejecting more sulfur increases its activity. Paper pH is also used to measure the Acidité of a fumerolle.

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