Quantification of Water in Hydrous Ringwoodite
ORIGINAL RESEARCH ARTICLE published: 28 January 2015 EARTH SCIENCE doi: 10.3389/feart.2014.00038 Quantification of water in hydrous ringwoodite Sylvia-Monique Thomas 1*,StevenD.Jacobsen2, Craig R. Bina 2, Patrick Reichart 3, Marcus Moser 3, Erik H. Hauri 4, Monika Koch-Müller 5,JosephR.Smyth6 and Günther Dollinger 3 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 Luft- und Raumfahrttechnik LRT2, Universität der Bundeswehr München, Neubiberg, Germany 4 Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC, USA 5 Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum (GFZ), Potsdam, Germany 6 Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, USA Edited by: Ringwoodite, γ-(Mg,Fe)2SiO4, in the lower 150 km of Earth’s mantle transition zone Mainak Mookherjee, Cornell (410–660 km depth) can incorporate up to 1.5–2wt% H2O as hydroxyl defects. We University, USA present a mineral-specific IR calibration for the absolute water content in hydrous Reviewed by: ringwoodite by combining results from Raman spectroscopy, secondary ion mass Geoffrey David Bromiley, University of Edinburgh, UK spectrometry (SIMS) and proton-proton (pp)-scattering on a suite of synthetic Mg- and Marc Blanchard, CNRS - Université Fe-bearing hydrous ringwoodites. H2O concentrations in the crystals studied here Pierre et Marie Curie, France range from 0.46 to 1.7wt% H2O (absolute methods), with the maximum H2Oin *Correspondence: the same sample giving 2.5 wt% by SIMS calibration. Anchoring our spectroscopic Sylvia-Monique Thomas, results to absolute H-atom concentrations from pp-scattering measurements, we report Department of Geoscience, University of Nevada Las Vegas, frequency-dependent integrated IR-absorption coefficients for water in ringwoodite −1 −2 4505 S.
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