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. Here 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 Mössbauer spectroscopy in laser-heated diamond anvil cells. On heating to temperatures of the Earth’s geotherm at pressures to ∼50 GPa FeCO3 partially dissociates to form various iron oxides. At higher pressures FeCO3 forms two new structures—tetrairon(III) orthocarbonate Fe43+C3O12, and diiron(II) diiron(III) tetracarbonate Fe22+Fe23+C4O13, both phases containing CO4 tetrahedra. Fe4C4O13 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
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Anmerkungen
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ISSN: 2041-1723
- Ereignis
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Veröffentlichung
- (wo)
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Freiburg
- (wer)
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Universität
- (wann)
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2024
- Urheber
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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
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10.1038/ncomms15960
- URN
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urn:nbn:de:bsz:25-freidok-2432370
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:36 MESZ
Datenpartner
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Beteiligte
- 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
- Universität
Entstanden
- 2024
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