Stability of iron-bearing carbonates in the deep Earth’s interior
Abstract
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.
- Authors:
-
[6];
- European Synchrotron Radiation Facility (ESRF), Grenoble (France); Univ. of Bayreuth (Germany). Bavarian Geoinstitute
- 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
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1393163
- Grant/Contract Number:
- FG02-94ER14466; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
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., and Dubrovinsky, Leonid. Stability of iron-bearing carbonates in the deep Earth’s interior. United States: N. p., 2017.
Web. doi:10.1038/ncomms15960.
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. Stability of iron-bearing carbonates in the deep Earth’s interior. United States. https://doi.org/10.1038/ncomms15960
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., and Dubrovinsky, Leonid. Wed .
"Stability of iron-bearing carbonates in the deep Earth’s interior". United States. https://doi.org/10.1038/ncomms15960. https://www.osti.gov/servlets/purl/1393163.
@article{osti_1393163,
title = {Stability of iron-bearing carbonates in the deep Earth’s interior},
author = {Cerantola, Valerio and Bykova, Elena and Kupenko, Ilya and Merlini, Marco and Ismailova, Leyla and McCammon, Catherine and Bykov, Maxim and Chumakov, Alexandr I. and Petitgirard, Sylvain and Kantor, Innokenty and Svitlyk, Volodymyr and Jacobs, Jeroen and Hanfland, Michael and Mezouar, Mohamed and Prescher, Clemens and Rüffer, Rudolf and Prakapenka, Vitali B. and Dubrovinsky, Leonid},
abstractNote = {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.},
doi = {10.1038/ncomms15960},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {Wed Jul 19 00:00:00 EDT 2017},
month = {Wed Jul 19 00:00:00 EDT 2017}
}
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Figures / Tables:
Figure 1: Stability diagram of FeCO3 at high P-T. Symbols and phase regions identified in experiments: magnesite-structured FeCO3 (orange dots), oxide(s) and recrystallized FeCO3 (orange-blue dots), tetrairon(III) orthocarbonate Fe4C3O12 (red triangles), diiron(II) diiron(III) tetracarbonate Fe4C4O13+ Fe4C3O12 (red-green dots), Fe4C4O12+ oxides (red-blue dots), Fe4C4O13+ oxides (green-blue dots), FeCO3 decomposition to Fe3O4+C+CO2more »
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