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Phase relations and their petrological implications in the system MgO-SiO_2-H_2O-CO_2 at pressures up to 100 kbar

Ellis, David E. and Wyllie, Peter J. (1980) Phase relations and their petrological implications in the system MgO-SiO_2-H_2O-CO_2 at pressures up to 100 kbar. American Mineralogist, 65 (5-6). pp. 540-556. ISSN 0003-004X. https://resolver.caltech.edu/CaltechAUTHORS:20160129-085241942

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Abstract

A comprehensive model has been developed for phase relations in the system MgO-SiO_2-H_2O-CO_2 on the basis of Schreinemakers' rules and subsolidus thermodynamic data. The assemblage forsterite plus enstatite can melt in the presence of vapor of any H_2O/CO_2 ratio at low pressures, in the presence of vapor whose H_2O/CO_2 ratio is buffered by magnesite at intermediate pressures, and at a vapor-absent eutectic at high pressures. Forsterite and H_2O-CO_2 vapor cannot coexist at pressures greater than 90 kbar. A thermal maximum is postulated to exist on the reaction Fo + En + V → L at pressures greater than 35 kbar. Thermal maxima on vapor-present melting reactions may be responsible for the eruption of kimberlitic magma from the upper mantle.


Item Type:Article
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http://www.minsocam.org/msa/collectors_corner/amtoc/toc1980.htmPublisherIssue Table of Contents
Alternate Title:Phase relations and their petrological implications in the system MgO-SiO2-H2O-CO2 at pressures up to 100 kbar
Additional Information:© 1980 Mineralogical Society of America. Manuscript received, April 9, 1979; accepted for publication, January 15, 1980. This research was supported by NSF grant EAR 76-20410 (Earth Sciences Section).
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Funding AgencyGrant Number
NSFEAR 76-20410
Issue or Number:5-6
Record Number:CaltechAUTHORS:20160129-085241942
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160129-085241942
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64083
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Jan 2016 20:12
Last Modified:03 Oct 2019 09:34

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