Phreatomagmatism And Its Relevance

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Journal Article: Phreatomagmatism And Its Relevance

Phreatomagmatic explosive volcanism results from the interaction of magma with external water, groundwater or surface water, close to or at the Earth's surface. Magma of any composition, acid to ultrabasic, may be involved in this type of explosive activity. At present, the relevance of phreatomagmatism is realized increasingly because it takes place in many diverse environments and affects not only small monogenetic volcanoes but also large volcanoes. At some volcanoes, as for example at Lake Taupo, New Zealand, a volume of several tens of km3 of magma may have been mixed with several km3 of external water. Phreatomagmatism has thus become an important aspect in volcanic hazard assessments. Other fields involving the interaction of water with a melt are the study of nuclear and other industrial safety hazards, of magma mixing, of diamond carrying volcanism and of hydrothermal ore deposits as well as geothermal and groundwater reservoirs. Experiments on the dynamics of magma-water interactions provide increasing insight into the principles and hazards of phreatomagmatic explosions; this type of research will become a new field in experimental petrology.

Volker Lorenz

Published Journal 
Chemical Geology, 1987



Volker Lorenz. 1987. Phreatomagmatism And Its Relevance. Chemical Geology. (!) .