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

Authors:
; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
German Federal Ministry of Education and Research (BMBF); German Research Foundation (DFG); National Science Foundation (NSF); USDOE Office of Science (SC)
OSTI Identifier:
1373790
DOE Contract Number:
FG02-94ER14466; AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Communications; Journal Volume: 8; Journal Issue: 07, 2017
Country of Publication:
United States
Language:
ENGLISH

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. 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., and Dubrovinsky, Leonid. 2017. "Stability of iron-bearing carbonates in the deep Earth's interior". United States. doi:10.1038/ncomms15960.
@article{osti_1373790,
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 = {},
doi = {10.1038/ncomms15960},
journal = {Nature Communications},
number = 07, 2017,
volume = 8,
place = {United States},
year = 2017,
month = 7
}
  • 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 Femore » $$3+\atop{4}$$C 3O 12 and diiron(II) diiron(III) tetracarbonate Fe$$2+\atop{2}$$ Fe$$3+\atop{2}$$C 4 O 13, both phases containing CO 4 tetrahedra. Fe 4 C 4 O 13 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.« less
  • Synchrotron-based X-ray emission spectroscopy (XES) is well suited to probing the local electronic structure of 3d transition metals such as Fe and Mn in their host phases. The laser-heated diamond anvil cell technique is uniquely capable of generating ultra-high static pressures and temperatures in excess of 100 GPa and 3000 K. Here X-ray emission spectroscopy and X-ray diffraction have been interfaced with the laser-heated diamond cell for studying the electronic spin states of iron in magnesiowuestite-(Mg{sub 0.75},Fe{sub 0.25})O and its crystal structure under lower-mantle conditions. X-ray emission spectra of the ferrous iron in a single crystal of magnesiowuestite-(Mg{sub 0.75},Fe{sub 0.25})Omore » indicate that a high-spin to low-spin transition of ferrous iron occurs at 54 to 67 GPa and 300 K and the ferrous iron remains in the high-spin state up to 47 GPa and 1300 K. This pilot study points to the unique capability of the synchrotron-based XES and X-ray diffraction techniques for addressing the issue of electronic spin transition or crossover in 3d transition metals and compounds under extreme high-P-T conditions.« less