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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...

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Autores principales: Farsang, Stefan, Louvel, Marion, Zhao, Chaoshuai, Mezouar, Mohamed, Rosa, Angelika D., Widmer, Remo N., Feng, Xiaolei, Liu, Jin, Redfern, Simon A. T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
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.
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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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