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- W612681773 abstract "The purpose of this paper is to marshal the evidenceand try to build a case that (1) shallow (1 to 7 km) circulationof surface waters in the Earth's crust is an extremelywidespread and common phenomenon in areas of igneousactivity and (2) deep (10 to 15 km) circulation of surfacewaters can occur in certain favorable geological situations,particularly in rift zones and areas of extensional tectonics.It is shown that very large amounts of water mayinteract with the rocks in such zones and that this can takeplace at temperatures high enough for melting and metamorphismto occur. Oxygen and hydrogen isotope studieshave proven to be very useful in establishing the characteristicsof such deeply circulating hydrothermal systemsand in determining the origins of the aqueous fluids involvedin producing granitic and rhyolitic magmas in suchenvironments. This is mainly because oxygen-18 anddeuterium are constituents of the H_2O molecule itself, andthus stable isotope signatures are by far the best way tocharacterize hydrothermal fluids of different origins. Theseconclusions are most clear-cut when low- ^(18)O, low-D meteoricwaters are involved in the isotopic exchange processes,but ocean waters, sedimentary formation waters,metamorphic dehydration waters, and magmatic waterscan also be distinguished from each other in favorablecircumstances." @default.
- W612681773 created "2016-06-24" @default.
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- W612681773 date "1990-01-01" @default.
- W612681773 modified "2023-09-23" @default.
- W612681773 title "Oxygen and hydrogen isotope constraints on the deep circulation of surface waters into zones of hydrothermal metamorphism and melting" @default.
- W612681773 hasPublicationYear "1990" @default.
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