Quantification of water in hydrous ringwoodite
نویسندگان
چکیده
منابع مشابه
Quantification of water in hydrous ringwoodite
Sylvia-Monique Thomas*, Steven D. Jacobsen, Craig R. Bina, Patrick Reichart, Marcus Moser, Erik H. Hauri, Monika Koch-Müller, Joseph R. Smyth and Günther Dollinger 1 Department of Geoscience, University of Nevada Las Vegas, Las Vegas, NV, USA 2 Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL, USA 3 Department für Luftund Raumfahrttechnik LRT2, Universität der B...
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First principle calculations were performed to investigate structural, IR, and elastic properties of hydrous ringwoodite and their evolution with pressure up to 36 GPa. Hydrogen defects are introduced by creating Mgor Si-vacancies Mg1.875H0.25SiO4, Mg1.75H0.5SiO4 and Mg2Si0.875H0.5O4. Energy considerations imply that the Mg-vacancy coupled substitution will be the easiest to form, but, in the E...
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a Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, USA b Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, USA c Department of Geosciences, Princeton University, Princeton, NJ 08544, USA d Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA e Bayerisches Geo...
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Ringwoodite ( -Mg2SiO4) is the stable polymorph of olivine in the transition zone between 525–660 km depth, and can incorporate weight percent amounts of H2O as hydroxyl, with charge compensated mainly by Mg vacancies (Mg2+ = 2H+), but also possibly as (Si4+ = 4H+ and Mg2+ + 2H+ = Si4+). We synthesized pure Mg ringwoodite containing 2.5(3) wt% H2O, measured by secondary ion mass spectrometry (S...
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We used thermochemical equilibrium calculations to predict Water vapor, present at 30–45 parts per million by volstabilities of pure rock-forming hydrous silicates on Venus’ ume (ppmv) in Venus’ subcloud atmosphere (Drossart surface as a function of elevation, atmospheric H2O and SO2 concentrations, and oxygen fugacity (fO2). About 50 different et al. 1993; Pollack et al. 1993; DeBergh et al. 1...
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2015
ISSN: 2296-6463
DOI: 10.3389/feart.2014.00038