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<title lang=en>Sulfur diagenesis under rapid accumulation of organic-rich sediments in a marine mangrove from Guadeloupe (French West Indies)</title>
<creator>Crémière, Antoine</creator>
<creator>Strauss, Harald</creator>
<creator>Sebilo, Mathieu</creator>
<creator>Hong, Wei-Li</creator>
<creator>Gros, Olivier</creator>
<creator>Schmidt, Sabine</creator>
<creator>Tocny, Jennifer</creator>
<creator>Henry, Françoise</creator>
<creator>Gontharet, Swanne</creator>
<creator>Laverman, Anniet M.</creator>
<contributor>University of Tromsø (UiT)</contributor>
<contributor>Institut d'écologie et des sciences de l'environnement de Paris (IEES) ; Institut National de la Recherche Agronomique (INRA) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Geological Survey of Norway</contributor>
<contributor>Institut für Geologie und Paläontologie ; Westfälische Wilhelms-Universität Münster (WWU)</contributor>
<contributor>Biologie de la Mangrove (BM) ; Systématique, adaptation, évolution (SAE) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Evolution Paris Seine ; Université des Antilles et de la Guyane (UAG) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA)</contributor>
<contributor>UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) ; Observatoire aquitain des sciences de l'univers (OASU) ; Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) ; Centre National de la Recherche Scientifique (CNRS) - Université du Littoral Côte d'Opale - Université de Lille, Sciences et Technologies</contributor>
<contributor>Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO) ; Université de Rennes 1 (UR1) - INEE - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>This work was supported by the Institute of Ecology and Environmental Sciences (IEES). Wei-Li Hong acknowledges the Research Council of Norway through its Centers of Excellence funding scheme, project number 223259, for financial support.</contributor>
<description>International audience</description>
<source>ISSN: 0009-2541</source>
<source>Chemical Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-01507696</identifier>
<identifier>https://hal-univ-rennes1.archives-ouvertes.fr/hal-01507696</identifier>
<identifier>https://hal-univ-rennes1.archives-ouvertes.fr/hal-01507696/document</identifier>
<identifier>https://hal-univ-rennes1.archives-ouvertes.fr/hal-01507696/file/Cr%C3%A9mi%C3%A8re%20et%20al.%20-%20Sulfur%20diagenesis%20under%20rapid%20accumulation%20of%20orga.pdf</identifier>
<source>https://hal-univ-rennes1.archives-ouvertes.fr/hal-01507696</source>
<source>Chemical Geology, Elsevier, 2017, 454, pp.67-79. 〈10.1016/j.chemgeo.2017.02.017〉</source>
<identifier>DOI : 10.1016/j.chemgeo.2017.02.017</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2017.02.017</relation>
<language>en</language>
<subject lang=en> Organic carbon-rich sediments</subject>
<subject lang=en> Sulfur oxidizing microbial mats</subject>
<subject lang=en> Marine mangrove</subject>
<subject lang=en> Early diagenesis</subject>
<subject lang=en> Sulfur and oxygen isotopes</subject>
<subject lang=en>Microbial sulfate reduction</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDV.EE.ECO] Life Sciences [q-bio]/Ecology, environment/Ecosystems</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The biogeochemistry of sulfur and carbon during early-diagenetic processes within organic-rich marine mangrove sediments was studied in the “Manche à Eau” lagoon, Guadeloupe, West Indies. These sediments are characterized by a total organic carbon content (TOC) mostly above 11 wt%, δ13CTOC below − 25‰ VPDB and C/Nmolar ratios exceeding 15. Rates of mangrove-derived organic carbon accumulation vary between ~ 200 and 400 gOC·m− 2·yr− 1, with highest rates at the shore of the lagoon. On the lagoon border, where colorless filamentous sulfur-oxidizing bacteria colonize the sediments, active sulfate reduction within the upper 20 cm, with a net removal rate of ~ 0.5 μmol·cm− 3·d− 1, is assumed to be essentially driven by organic carbon oxidation. This is expressed by relatively low apparent sulfur isotope fractionation (34εnet = − 33‰) and a gentle δ18O/δ34Ssulfate apparent slope of 0.36 ± 0.03 (2s). Further inside the lagoon, in the absence of sulfur-oxidizing bacteria, higher apparent sulfur isotope fractionation and a steeper δ18O/δ34Ssulfate slope (0.67 ± 0.20) suggest an overall lower sulfate removal rate that may be coupled to minor sulfur disproportionation. Spatial and vertical variation in sulfur cycling, reflected by oxygen and sulfur isotopic characteristics, seem to be mainly controlled by unsteady to relatively steady organic matter deposition and its reactivity. In all sediments, δ34S values of pyrite are positively correlated with the TOC/TS ratio and negatively correlated with δ13CTOC; suggesting a primary control of the quantity and quality of organic matter on the pyrite isotope records, despite potential iron-limiting conditions for the most active sites. Our results provide insights into the role of organic carbon input on sulfur cycling; stimulating sulfate reduction and in turn the presence of sulfur-oxidizing microbial mats, resulting in an intense cycling of both carbon and sulfur in these marine mangrove sediments.</description>
<date>2017</date>
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