Carbonate-Metal Reactions in the Lower Mantle.
| Autor: | Davis AH; Department of the Geophysical Sciences, The University of Chicago, 5734 S. Ellis Avenue, Chicago, Illinois 60637, United States., Chidester BA; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States., Greenberg E; Center for Advanced Radiation Sources, The University of Chicago, 5734 S. Ellis Avenue, Chicago, Illinois 60637, United States., Prakapenka VB; Center for Advanced Radiation Sources, The University of Chicago, 5734 S. Ellis Avenue, Chicago, Illinois 60637, United States., Campbell AJ; Department of the Geophysical Sciences, The University of Chicago, 5734 S. Ellis Avenue, Chicago, Illinois 60637, United States. |
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| Jazyk: | angličtina |
| Zdroj: | ACS earth & space chemistry [ACS Earth Space Chem] 2024 Mar 25; Vol. 8 (4), pp. 654-664. Date of Electronic Publication: 2024 Mar 25 (Print Publication: 2024). |
| DOI: | 10.1021/acsearthspacechem.3c00101 |
| Abstrakt: | Carbonates are important carbon-bearing phases in the mantle. While their role in upper mantle petrologic processes has been well studied, their effect on phase relations, melting, and transport properties in the lower mantle is less understood. The stability of carbonates in the mantle depends on a host of factors, including pressure, temperature, oxygen fugacity, and reactions with surrounding mantle phases. To understand the stability of carbonates in the presence of metal in the lower mantle, carbonate-metal reaction experiments on the Fe-Si-Ca-Mg-C-O system were conducted up to 124 GPa and 3200 K. We find that carbonates react with iron alloys to form silicates, iron carbides, and oxides. However, the temperature at which these reactions occur increases with pressure, indicating that along a geotherm in the lowermost mantle carbonates are the stable carbon-bearing phase. Carbon is found to be less siderophilic at high-pressure compared to silicon. Competing Interests: The authors declare no competing financial interest. (© 2024 The Authors. Published by American Chemical Society.) |
| Databáze: | MEDLINE |
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