Volcanic Gases

volcanic gases

[väl′kan·ik ′gas·əz]
(geology)
Volatile matter composed principally of about 90% water vapor, and carbon dioxide, sulfur dioxide, hydrogen, carbon monoxide, and nitrogen, released during an eruption of a volcano.

Volcanic Gases

 

gases formed during and after an eruption from a crater, crevices on the sides of volcanoes, and lava flows and pyroclastic rock. The gases emitted during a crater eruption are called eruptive gases, and all others, which are emitted during periods of quiet volcanic activity in the form of streams and swirling masses (from various sections of the crater or from the surface of lava flows), are called fumarole gases.

Eruptive gases determine the character of explosive eruptions and influence the flow of molten lava. These gases contain vapors of H2O, H2 HCl, HF, H2S, CO, and CO2 and small amounts of volatile compounds, mainly halogen compounds of many elements. Fumarole gases are mixtures of gases emitted from lava or pyroclastic rock with gases captured from the atmosphere, formed as a result of their reaction with organic substances found under the hot lava flows or the pyroclastic deposits.

Volcanic gases form numerous hot springs as they pass through the zone of underground waters.

REFERENCES

Basharina, L. A. “Vulkanicheskie gazy na razlichnykh stadiiakh aktivnosti vulkanov.” In the collection Tr. laboratorii vulkanologii AN SSSR, issue 19. Moscow, 1961.
Iwasaki, I. [et al.]. “Nature of Volcanic Gases and Volcanic Eruption.” Bulletin Volcanologique, 1963, vol. 26.
References in periodicals archive ?
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1998b: Remote measurement of volcanic gases by Fourier transform infrared spectroscopy.
Or to tell you that this area dates back around 1,60,000 years; and that boiling springs and volcanic gases introduce numerous minerals into the water.
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Emissions of volcanic gases go up and down, helping to cool or heat the planet, while greenhouse gas emissions from human activity just continue to go up.
Volcanologists said seismic activity in the area had increased in recent weeks and the spew of rocks, fine particles and steam from the snow-capped peak was caused by a pressure build up of volcanic gases.
Researchers believe that the turtles had initiated sex in the surface waters of the lake that once existed on the site, and were then overcome as they sank through deeper layers made toxic by the sudden release of volcanic gases.