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Hydration and melting reactions in the system MgO-SiO_2-H_2O at pressures up to 100 kbar

Ellis, David E. and Wyllie, Peter J. (1979) Hydration and melting reactions in the system MgO-SiO_2-H_2O at pressures up to 100 kbar. American Mineralogist, 64 (1-2). pp. 41-48. ISSN 0003-004X.

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The proposed model for the system MgO-SiO_2-H_2O ties subsolidus and melting reactions into an internally-consistent P-T net. None of the hydrous magnesium silicates considered is stable at the temperature of the solidus for forsterite + enstatite + H_2O; however, brucite is stable at solidus temperatures and at pressures greater than 50 kbar. In the presence of H_2O enstatite melts incongruently to forsterite plus a silica-saturated liquid at pressures up to 90 kbar. At 90 kbar the hydration reaction Fo + H_2O → En + Br intersects the solidus, and at higher pressures forsterite and H_2O do not coexist. The melting of forsterite + enstatite in the presence of a small amount of H_2O is vapor-present at pressures up to 90 kbar and generates a vapor-saturated, silica-saturated liquid. At higher pressures melting of the same bulk composition generates a silica-saturated, vapor-undersaturated liquid.

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Alternate Title:Hydration and melting reactions in the system MgO-SiO2-H2O at pressures up to 100 kbar
Additional Information:© 1979 Mineralogical Society of America. Manuscript received, February 17, 1978; accepted for publication, June 28, 1978. This research was supported by NSF grant EAR 76-20410, and in part by the Materials Research Laboratory Program of the National Science Foundation at the University of Chicago. A perceptive review by Joseph Chernosky helped improve the paper.
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NSFEAR 76-20410
Issue or Number:1-2
Record Number:CaltechAUTHORS:20160202-133224481
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64170
Deposited By: Tony Diaz
Deposited On:02 Feb 2016 22:37
Last Modified:03 Oct 2019 09:35

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