Hydration and melting reactions in the system MgO-SiO_2-H_2O at pressures up to 100 kbar
- Creators
- Ellis, David E.
- Wyllie, Peter J.
Abstract
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.
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.Additional details
- Alternative title
- Hydration and melting reactions in the system MgO-SiO2-H2O at pressures up to 100 kbar
- Eprint ID
- 64170
- Resolver ID
- CaltechAUTHORS:20160202-133224481
- EAR 76-20410
- NSF
- Created
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2016-02-02Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences