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Muscovite dehydration and melting in deep crust and subducted oceanic sediments

Huang, W. L. and Wyllie, P. J. (1973) Muscovite dehydration and melting in deep crust and subducted oceanic sediments. Earth and Planetary Science Letters, 18 (1). pp. 133-136. ISSN 0012-821X. doi:10.1016/0012-821X(73)90045-9.

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Mixtures of natural quartz and synthetic muscovite and sanidine, with and without free water, were reacted in piston-cylinder apparatus between 10 and 35 kb. Extrapolation of experimentally determined melting curves defines an invariant point for the assemblage muscovite + sanidine + corundum + liquid + vapor at 9.5 kb and 825°C, and one for the same assemblage with quartz at 5.8 kb and 730°C. These two points define the high pressure limit for the subsolidus dehydration reactions of muscovite and of muscovite + quartz, which facilitates selection among the varied muscovite dehydration curves previously published. Comparison of published estimates of temperature distribution of subducted lithosphere slabs with muscovite stability ranges indicates that muscovite in subducted oceanic sediments would probably be dehydrated or melted before reaching a depth of 30 km, with a maximum possible depth of 100 km. This suggests that although muscovite could possibly be involved in magma generation at volcanic fronts, it neither contributes water for magmatic processes much beyond Dickinson's arc-trench gap, nor influences the chemical variation in calc-alkaline lavas across arc complexes and in plutonic rocks across batholiths.

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Additional Information:© 1973 Published by Elsevier B.V. Received 19 September 1972; Revised 21 November 1972. We are grateful to the National Science Foundation for grant GA-29426 and the Advanced Research Projects Agency grant DAHC-15-67-C-0220 for support of this research, and to R.C, Newton and R.B. Merrill for critical review of an early version of this manuscript.
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Advanced Research Projects Agency (ARPA)DAHC-15-67-C-0220
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Record Number:CaltechAUTHORS:20160122-131122924
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Official Citation:W.L. Huang, P.J. Wyllie, Muscovite dehydration and melting in deep crust and subducted oceanic sediments, Earth and Planetary Science Letters, Volume 18, Issue 1, 1973, Pages 133-136, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63901
Deposited By: Tony Diaz
Deposited On:22 Jan 2016 22:23
Last Modified:10 Nov 2021 23:23

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