Stability of iron-bearing carbonates in the deep Earth’s interior

Cerantola, Valerio; Bykova, Elena; Kupenko, Ilya; Merlini, Marco; Ismailova, Leyla; McCammon, Catherine; Bykov, Maxim; Chumakov, Alexandr I.; Petitgirard, Sylvain; Kantor, Innokenty; Svitlyk, Volodymyr; Jacobs, Jeroen; Hanfland, Michael; Mezouar, Mohamed; Prescher, Clemens; Rüffer, Rudolf; Prakapenka, Vitali B.; Dubrovinsky, Leonid

doi:10.1038/ncomms15960

Title: Stability of iron-bearing carbonates in the deep Earth’s interior

Journal Article · 18 July 2017 · Nature Communications

DOI: https://doi.org/10.1038/ncomms15960 · OSTI ID:1393163

Cerantola, Valerio ^[1]; Bykova, Elena ^[2]; Kupenko, Ilya ^[3]; Merlini, Marco ^[4]; Ismailova, Leyla ^[5];

^[6]; Bykov, Maxim ^[7]; Chumakov, Alexandr I. ^[3]; Petitgirard, Sylvain ^[6]; Kantor, Innokenty ^[3]; Svitlyk, Volodymyr ^[3]; Jacobs, Jeroen ^[3]; Hanfland, Michael ^[3]; Mezouar, Mohamed ^[3]; Prescher, Clemens ^[8]; Rüffer, Rudolf ^[3]; Prakapenka, Vitali B. ^[9]; Dubrovinsky, Leonid ^[6]

European Synchrotron Radiation Facility (ESRF), Grenoble (France); Univ. of Bayreuth (Germany). Bavarian Geoinstitute; European Synchrotron Radiation Facility
Univ. of Bayreuth (Germany). Bavarian Geoinstitute; Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Univ. of Milan (Italy). Dept. of Earth Sciences
Center for Hydrocarbon Recovery, Moscow (Russia). Skolkovo Inst. of Science and Technology
Univ. of Bayreuth (Germany). Bavarian Geoinstitute
Univ. of Bayreuth (Germany). Bavarian Geoinstitute; National Univ., of Science and Technology, Moscow (Russia). Material Modeling and Development Lab.
Univ. of Cologne (Germany). Inst. of Geology and Mineralogy
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources

The presence of carbonates in inclusions in diamonds coming from depths exceeding 670 km are obvious evidence that carbonates exist in the Earth’s lower mantle. However, their range of stability, crystal structures and the thermodynamic conditions of the decarbonation processes remain poorly constrained. We investigate the behaviour of pure iron carbonate at pressures over 100 GPa and temperatures over 2,500 K using single-crystal X-ray diffraction and Mossbauer spectroscopy in laser-heated diamond anvil cells. On heating to temperatures of the Earth’s geotherm at pressures to B 50 GPa FeCO ₃ partially dissociates to form various iron oxides. Furthermore, at higher pressures FeCO ₃ forms two new structures— tetrairon(III) orthocarbonate Fe$$3+\atop{4}$$C₃O₁₂ and diiron(II) diiron(III) tetracarbonate Fe$$2+\atop{2}$$ Fe$$3+\atop{2}$$C₄ O₁₃, both phases containing CO₄ tetrahedra. Fe₄ C₄ O₁₃ is stable at conditions along the entire geotherm to depths of at least 2,500 km, thus demonstrating that self-oxidation-reduction reactions can preserve carbonates in the Earth’s lower mantle.

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Research Organization:: Univ. of Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-94ER14466; AC02-06CH11357

OSTI ID:: 1393163

Alternate ID(s):: OSTI ID: 1373790

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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