Volatiles in Magmas
2015; Elsevier BV; Linguagem: Inglês
10.1016/b978-0-12-385938-9.00007-9
AutoresPaul Wallace, Terry Plank, Marie Edmonds, E. H. Hauri,
Tópico(s)Hydrocarbon exploration and reservoir analysis
ResumoAbstract Magmas contain dissolved gases-volatiles-when they are at depth in the Earth. When magma ascends to the Earth's surface, the volatiles can no longer remain dissolved because of the decrease of pressure, and this causes the formation and expansion of gas bubbles, creating a magmatic froth that can erupt explosively, depending on the gas content. Thus volatiles play an important role in governing the eruptive behavior of volcanoes. This chapter discusses the solubility, concentrations, and degassing behavior of the major volatiles (H2O, CO2, S, Cl, F) in magmas from various tectonic environments and the methods that have been used to gain this information. The origins of volatiles in the Earth, large-scale Earth degassing processes resulting from magmatism, and volatile recycling in subduction zones are also reviewed.
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