A model of phase relations in the system MgO-SiO2-H2O-CO2 and prediction of the compositions of liquids coexisting with forsterite and enstatite
Abstract
A comprehensive model has been developed for the system Mg0-Si02-H20-C02 on the basis of experimental studies, Schreinemaker's rules, and thermodynamic data. The assemblage forsterite plus enstatite is predicted to melt in the presence of vapor of any H20/C02 ratio at low pressures, in the presence of vapor whose H20/C02 ratio is buffered by the presence of magnesite at intermediate pressures, and at a vapor-absent eutectic with brucite and magnetite at high pressures. The composition of the liquid at the solidus for a bulk composition of forsterite plus enstatite plus a small amount of volatiles with a 3/1 H2O/CO2 ratio changes from enstatite-quartz normative at 20 kbar, to periclase-forsterite normative at 50 kbar, to forsterite-enstatite normative at 90 kbar and greater pressures. Forsterite cannot coexist with H2O-CO2 vapor at pressures greater than 90 kbar. Thus all melting in the earth's mantle at higher pressures must be vapor-absent.
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Dissolved CO2 plays a key role on the precipitation of magnesite and hydrated Mg carbonates.
“Dissolved CO 2 plays a key role on the precipitation of magnesite and hydrated Mg carbonates.91”
From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [91]
In a closed batch reactor system with brucite, temperature and pressure play a key role on magnesite formation.
“In a closed batch reactor system with brucite, temperature and pressure have been shown to play a key role on the magnesite formation.92”
From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [92]
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Santos, H. S., Nguyen, H., Venâncio, F., Ramteke, D., Zevenhoven, R., & Kinnunen, P. (2023) · Inorganic Chemistry Frontiers · doi:10.1039/d2qi02482a · Cited by 108 · see citing works
- Authors
- Ellis, D. E., & Wyllie, P. J.
- Affiliations
- University of Chicago (US)
- Venue
- Kimberlites, Diatremes, and Diamonds: Their Geology, Petrology, and Geochemistry
- Publisher
- American Geophysical Union
- Published
- 1979
- Pages
- 313-318
- OpenAlex
- W1571427903
- Cited by
- 5
- References
- 0
- Citations by year
- 2023: 1 · 2021: 1
- FWCI
- 1.19
- Type
- book chapter
- Language
- en
- Open access
- closed
- Locations
- American Geophysical Union eBooks (publishedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
- Physical Sciences › Engineering › Biomedical Engineering › Phase Equilibria and Thermodynamics
- Keywords
- phase equilibria, forsterite, enstatite, solidus, liquid composition, magnesite, brucite, magnetite, eutectic, mantle melting, high-pressure melting, periclase
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