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P-V-T measurements of iron silicide (epsilon -FeSi) implications for silicate-metal interactions in the early Earth

Francois Guyot, Jianzhong Zhang, Isabelle Martinez, Jan Matas, Yanick Ricard and Marc Javoy
P-V-T measurements of iron silicide (epsilon -FeSi) implications for silicate-metal interactions in the early Earth (in EMPG-VI; Experimental mineralogy, petrology and geochemistry, E. A. J. Burke (editor), C. Chopin (editor), W. V. Maresch (editor), L. Ungaretti (editor) and C. Willaime (editor))
European Journal of Mineralogy (April 1997) 9 (2): 277-285

Abstract

The high-P, high-T equation of state of epsilon -FeSi has been determined by synchrotron XRD in situ in a multi-anvil apparatus. The thermoelastic parameters are V (sub 0) 90.39 Aa (super 3) , K (sub 0) 172 GPa, (Delta I>K/Delta I>T) (sub p) -0.043 GPa/K, alpha 5.1 X 10 (super -5) /K with fixed K' (sub 0) = 4. These equation-of-state parameters were included in a thermodynamic model of the reaction between Fe and SiO (sub 2) , showing that the reduction of the silicates by iron presents a maximum at P 8-15 GPa, could benefit at high T, depending on the values of the activity coefficient of Si in Fe-Si alloys. Similar reduction reactions in the Earth's complex system could have profound implications for the compositions of mantle and core, as well as for reactions at the core-mantle boundary.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 2
Title: P-V-T measurements of iron silicide (epsilon -FeSi) implications for silicate-metal interactions in the early Earth
Title: EMPG-VI; Experimental mineralogy, petrology and geochemistry
Author(s): Guyot, FrancoisZhang, JianzhongMartinez, IsabelleMatas, JanRicard, YanickJavoy, Marc
Author(s): Burke, E. A. J.editor
Author(s): Chopin, C.editor
Author(s): Maresch, W. V.editor
Author(s): Ungaretti, L.editor
Author(s): Willaime, C.editor
Affiliation: University at Stony Brook, Department of Earth and Space Sciences and CHiPR, Stony Brook, NY, United States
Pages: 277-285
Published: 199704
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Sixth international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Bayreuth, DEU, Federal Republic of Germany
Meeting date: 19960410April 10-13, 1996
References: 27
Accession Number: 1997-036942
Categories: Geophysics of minerals and rocks
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: 2 tables
Secondary Affiliation: ENS Lyon, FRA, FranceIPGP, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199712
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