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Magnesite formation from MgO and CO (sub 2) at the pressures and temperatures of Earth's mantle

Henry P. Scott, Vincent M. Doczy, Mark R. Frank, Maggie Hasan, Jung-Fu Lin and Jing Yang
Magnesite formation from MgO and CO (sub 2) at the pressures and temperatures of Earth's mantle
American Mineralogist (July 2013) 98 (7): 1211-1218

Abstract

Magnesite (MgCO (sub 3) ) is an important phase for the carbon cycle in and out of the Earth's mantle. Its comparably large P-T stability has been inferred for several years based on the absence of its decomposition in experiments. Here we report the first experimental evidence for synthesis of magnesite out of its oxide components (MgO and CO (sub 2) ) at P-T conditions relevant to the Earth"s mantle. Magnesite formation was observed in situ using synchrotron X-ray diffraction, coupled with laser-heated diamond-anvil cells (DACs), at pressures and temperatures of Earth's mantle. Despite the existence of multiple high-pressure CO (sub 2) polymorphs, the magnesite-forming reaction was observed to proceed at pressures ranging from 5 to 40 GPa and temperatures between 1400 and 1800 K. No other pressure-quenchable materials were observed to form via the MgO + CO (sub 2) = MgCO (sub 3) reaction. This work further strengthens the notion that magnesite may indeed be the primary host phase for oxidized carbon in the deep Earth.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 98
Serial Issue: 7
Title: Magnesite formation from MgO and CO (sub 2) at the pressures and temperatures of Earth's mantle
Affiliation: Indiana University at South Bend, Department of Physics and Astronomy, South Bend, IN, United States
Pages: 1211-1218
Published: 201307
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 67
Accession Number: 2013-061392
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Northern Illinois University, USA, United StatesUniversity of Texas at Austin, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201337
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