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Deep carbon cycle constrained by carbonate solubility
Earth’s deep carbon cycle affects atmospheric CO(2), climate, and habitability. Owing to the extreme solubility of CaCO(3), aqueous fluids released from the subducting slab could extract all carbon from the slab. However, recycling efficiency is estimated at only around 40%. Data from carbonate incl...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8280166/ https://www.ncbi.nlm.nih.gov/pubmed/34262043 http://dx.doi.org/10.1038/s41467-021-24533-7 |
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author | Farsang, Stefan Louvel, Marion Zhao, Chaoshuai Mezouar, Mohamed Rosa, Angelika D. Widmer, Remo N. Feng, Xiaolei Liu, Jin Redfern, Simon A. T. |
author_facet | Farsang, Stefan Louvel, Marion Zhao, Chaoshuai Mezouar, Mohamed Rosa, Angelika D. Widmer, Remo N. Feng, Xiaolei Liu, Jin Redfern, Simon A. T. |
author_sort | Farsang, Stefan |
collection | PubMed |
description | Earth’s deep carbon cycle affects atmospheric CO(2), climate, and habitability. Owing to the extreme solubility of CaCO(3), aqueous fluids released from the subducting slab could extract all carbon from the slab. However, recycling efficiency is estimated at only around 40%. Data from carbonate inclusions, petrology, and Mg isotope systematics indicate Ca(2+) in carbonates is replaced by Mg(2+) and other cations during subduction. Here we determined the solubility of dolomite [CaMg(CO(3))(2)] and rhodochrosite (MnCO(3)), and put an upper limit on that of magnesite (MgCO(3)) under subduction zone conditions. Solubility decreases at least two orders of magnitude as carbonates become Mg-rich. This decreased solubility, coupled with heterogeneity of carbon and water subduction, may explain discrepancies in carbon recycling estimates. Over a range of slab settings, we find aqueous dissolution responsible for mobilizing 10 to 92% of slab carbon. Globally, aqueous fluids mobilise [Formula: see text] % ([Formula: see text] Mt/yr) of subducted carbon from subducting slabs. |
format | Online Article Text |
id | pubmed-8280166 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-82801662021-07-23 Deep carbon cycle constrained by carbonate solubility Farsang, Stefan Louvel, Marion Zhao, Chaoshuai Mezouar, Mohamed Rosa, Angelika D. Widmer, Remo N. Feng, Xiaolei Liu, Jin Redfern, Simon A. T. Nat Commun Article Earth’s deep carbon cycle affects atmospheric CO(2), climate, and habitability. Owing to the extreme solubility of CaCO(3), aqueous fluids released from the subducting slab could extract all carbon from the slab. However, recycling efficiency is estimated at only around 40%. Data from carbonate inclusions, petrology, and Mg isotope systematics indicate Ca(2+) in carbonates is replaced by Mg(2+) and other cations during subduction. Here we determined the solubility of dolomite [CaMg(CO(3))(2)] and rhodochrosite (MnCO(3)), and put an upper limit on that of magnesite (MgCO(3)) under subduction zone conditions. Solubility decreases at least two orders of magnitude as carbonates become Mg-rich. This decreased solubility, coupled with heterogeneity of carbon and water subduction, may explain discrepancies in carbon recycling estimates. Over a range of slab settings, we find aqueous dissolution responsible for mobilizing 10 to 92% of slab carbon. Globally, aqueous fluids mobilise [Formula: see text] % ([Formula: see text] Mt/yr) of subducted carbon from subducting slabs. Nature Publishing Group UK 2021-07-14 /pmc/articles/PMC8280166/ /pubmed/34262043 http://dx.doi.org/10.1038/s41467-021-24533-7 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Farsang, Stefan Louvel, Marion Zhao, Chaoshuai Mezouar, Mohamed Rosa, Angelika D. Widmer, Remo N. Feng, Xiaolei Liu, Jin Redfern, Simon A. T. Deep carbon cycle constrained by carbonate solubility |
title | Deep carbon cycle constrained by carbonate solubility |
title_full | Deep carbon cycle constrained by carbonate solubility |
title_fullStr | Deep carbon cycle constrained by carbonate solubility |
title_full_unstemmed | Deep carbon cycle constrained by carbonate solubility |
title_short | Deep carbon cycle constrained by carbonate solubility |
title_sort | deep carbon cycle constrained by carbonate solubility |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8280166/ https://www.ncbi.nlm.nih.gov/pubmed/34262043 http://dx.doi.org/10.1038/s41467-021-24533-7 |
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