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      High-pressure synthesis and storage of solid organic compounds in active subduction zones

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          Abstract

          Recent thermodynamic and experimental studies have suggested that volatile organic compounds (e.g., methane, formate, and acetate) can be produced and stabilized in subduction zones, potentially playing an important role in the deep carbon cycle. However, field evidence for the high-pressure production and storage of solid organic compounds is missing. Here, we examine forearc serpentinite clasts recovered by drilling mud volcanoes above the Mariana subduction zone. Notable correlations between carbon and iron stable-isotope signatures and fluid-mobile element (B, As and Sb) concentrations provide evidence for the percolation of slab-derived CO 2-rich aqueous fluids through the forearc mantle. The presence of carbonaceous matter rich in aliphatic moieties within high-temperature clasts (>350°C) demonstrates that molecular hydrogen production associated with forearc serpentinization is an efficient mechanism for the reduction and conversion of slab-derived CO 2-rich fluids into solid organic compounds. These findings emphasize the need to consider the forearc mantle as an important reservoir of organic carbon on Earth.

          Abstract

          Abstract

          The study of forearc ultramafic clasts provides evidence for a deep organic carbon cycle in subduction zones.

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          Infrared Spectroscopy: Fundamentals and Applications

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            The deep carbon cycle and melting in Earth's interior

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              Reevaluating carbon fluxes in subduction zones, what goes down, mostly comes up.

              Carbon fluxes in subduction zones can be better constrained by including new estimates of carbon concentration in subducting mantle peridotites, consideration of carbonate solubility in aqueous fluid along subduction geotherms, and diapirism of carbon-bearing metasediments. Whereas previous studies concluded that about half the subducting carbon is returned to the convecting mantle, we find that relatively little carbon may be recycled. If so, input from subduction zones into the overlying plate is larger than output from arc volcanoes plus diffuse venting, and substantial quantities of carbon are stored in the mantle lithosphere and crust. Also, if the subduction zone carbon cycle is nearly closed on time scales of 5-10 Ma, then the carbon content of the mantle lithosphere + crust + ocean + atmosphere must be increasing. Such an increase is consistent with inferences from noble gas data. Carbon in diamonds, which may have been recycled into the convecting mantle, is a small fraction of the global carbon inventory.
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                Author and article information

                Contributors
                Role: ConceptualizationRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing - original draft
                Role: ConceptualizationRole: InvestigationRole: MethodologyRole: ResourcesRole: ValidationRole: VisualizationRole: Writing - review & editing
                Role: ConceptualizationRole: Formal analysisRole: InvestigationRole: ResourcesRole: VisualizationRole: Writing - original draft
                Role: MethodologyRole: Validation
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Role: Formal analysisRole: ValidationRole: VisualizationRole: Writing - original draftRole: Writing - review & editing
                Role: Data curationRole: InvestigationRole: MethodologyRole: ResourcesRole: ValidationRole: VisualizationRole: Writing - review & editing
                Role: Funding acquisitionRole: SupervisionRole: Writing - review & editing
                Journal
                Sci Adv
                Sci Adv
                sciadv
                advances
                Science Advances
                American Association for the Advancement of Science
                2375-2548
                September 2022
                16 September 2022
                : 8
                : 37
                : eabo2397
                Affiliations
                [ 1 ]Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France.
                [ 2 ]Université de Lorraine, CNRS, GeoRessources, Vandoeuvre-lès-Nancy, France.
                [ 3 ]Université de Lorraine, CNRS, CRPG, Nancy, France.
                [ 4 ]Laboratoire G-Time, DGES, Université Libre de Bruxelles (ULB), Brussels, Belgium.
                [ 5 ]Department of Earth Sciences, University of Cambridge, Cambridge, UK.
                Author notes
                [* ]Corresponding author. Email: debret@ 123456ipgp.fr
                Author information
                https://orcid.org/0000-0003-2057-2906
                https://orcid.org/0000-0002-9866-3114
                https://orcid.org/0000-0001-8832-4840
                https://orcid.org/0000-0002-2647-3864
                https://orcid.org/0000-0002-1432-436X
                https://orcid.org/0000-0003-4947-3784
                https://orcid.org/0000-0001-5837-1590
                Article
                abo2397
                10.1126/sciadv.abo2397
                9481122
                36112687
                05b6ef99-30fa-4bb7-a143-de5c7737c3c1
                Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

                This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 24 January 2022
                : 19 July 2022
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100011072, Labex UnivEarthS;
                Award ID: ANR-10-LABX-0023
                Funded by: FundRef http://dx.doi.org/10.13039/501100011072, Labex UnivEarthS;
                Award ID: ANR-18-IDEX-0001
                Funded by: NERC;
                Award ID: NE/P020860/1
                Funded by: Fondation Wiener Anspach;
                Award ID: RG97553
                Categories
                Research Article
                Earth, Environmental, Ecological, and Space Sciences
                SciAdv r-articles
                Geochemistry
                Geology
                Geochemistry
                Custom metadata
                Vivian Hernandez

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