Water pressures during differentiation and crystallization of some ash-flow magmas from southern Nevada
- 1 December 1966
- journal article
- Published by American Journal of Science (AJS) in American Journal of Science
- Vol. 264 (10) , 810-826
- https://doi.org/10.2475/ajs.264.10.810
Abstract
Water pressures between approximately 500 and 1,200 bars during differentiation and crystallization of source magmas for 6 Tertiary rhyolitic ash-flow sheets from southern Nevada are indicated by plots of 82 chemical analyses in the experimentally determined system NaAlSi 3 O 8 -KAlSi 3 O 8 -SiO 2 -H 2 O. These pressures are considerably lower than most previously estimated for rhyolitic magmas. The water pressures also provide some basis for estimating water content, temperature, and depth of the magmas during differentiation and crystallization.Keywords
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