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<title lang=en>Geochemistry of cold seepage-impacted sediments: Per-ascensum or per-descensum trace metal enrichment?</title>
<creator>Tribovillard, Nicolas</creator>
<creator>Armynot Du Châtelet, Eric</creator>
<creator>GAY, Aurélien</creator>
<creator>Barbecot, Florent</creator>
<creator>Sansjofre, Pierre</creator>
<creator>Potdevin, Jean-Luc</creator>
<contributor>Bassins ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Interactions et dynamique des environnements de surface (IDES) ; Université Paris-Sud - Paris 11 (UP11) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut de Physique du Globe de Paris (IPGP) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - IPG PARIS - Université Paris Diderot - Paris 7 (UPD7) - Université de la Réunion (UR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0009-2541</source>
<source>Chemical Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00806655</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00806655</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00806655</source>
<source>Chemical Geology, Elsevier, 2013, 340, pp.1-12. 〈10.1016/j.chemgeo.2012.12.012〉</source>
<identifier>DOI : 10.1016/j.chemgeo.2012.12.012</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2012.12.012</relation>
<language>en</language>
<subject lang=en>Particulate shuttle</subject>
<subject lang=en>Molybdenum</subject>
<subject lang=en>Arsenic</subject>
<subject lang=en>Antimony</subject>
<subject lang=en>Cold seeps</subject>
<subject lang=en>Late Jurassic</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Cold seeps, located on sea floors and frequently fueled with methane, have been much studied for the formation of carbonate nodules, crusts or masses resulting from the activity og communities of anaerobic bacteria. In this paper, we examine the impact of cold seepage on their caging sediments, as far as their geochemical composition and microfaunal content are concerned. To this end, two fossil cold seeps of the Jurassic Beauvoisin site (Vocontian Trough, SE-France) are studied, focusing on the redox-sensitive and/or sulfide-forming trace metals. We observe that: 1) the carbonate edifices of the cold seeps are enriched in specific elements, namely, Sr, Mo As and Sb, compared to their caging marlstones, and 2) the benthic foraminifer populations were present close to the edifices. The Sr enrichment is ascribed to a contamination of the seeping fluids at the contact with underlying evaporites; the Mo-As-Sb enrichment may have several, non-exclusive, origins. We retain two scenarios; in the first one, the enrichment is due to the ascending fluids that could collect these elements when passing through thick shaly formations; in the second scenario, Mo, As and Sb were supplied to the sites of carbonate precipitation together with Fe- and Mn-oxy-hydroxides (the so-called particulate shuttle process). We favor the second scenario (possibly coupled to the first one) because the rather uncommon Mo-As-Sb association is also observed for reducing sediments deposited under the influence of Fe-Mn-shuttling.</description>
<date>2013-02-24</date>
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