Li, Z and Stackhouse, S orcid.org/0000-0001-7605-3510 (2020) Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions. Earth and Planetary Science Letters, 531. 115959. ISSN 0012-821X
Abstract
Constraining the flux of carbon in and out of the interior of the Earth due to long-term geological processes is important, because of the influence that it has on climate change. On timescales of billions of years, host minerals such as carbonate phases could play a significant role in the global carbon cycle, transporting carbon into the lower mantle as a component of subducting slabs. We use density functional theory based calculations to study the high-pressure, high-temperature phase stability of Mg1-xFexCO3. Our results show that iron-rich phases, where carbon is in tetrahedral coordination, are only stable at lower mantle conditions due to their magnetic entropy, which is also responsible for the unusual shape of their phase boundary. Low-pressure carbonate phases are found to be highly anisotropic, but high-pressure carbonate phases are not, which has important implications for their seismic detectability. Our work confirms that future discussions of the global carbon cycle should include the deep Earth.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
Keywords: | first-principles; carbonate; mantle |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Funding Information: | Funder Grant number NERC NE/K006290/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Nov 2019 11:12 |
Last Modified: | 25 Jun 2023 22:03 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.epsl.2019.115959 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:153235 |