Enrichment of redox-sensitive trace metals (U,V, Mo,As) associated with the late Hauterivian Faraoni oceanic anoxic event |
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| Authors: | Stéphane Bodin Alexis Godet Virginie Matera Philipp Steinmann Jean Vermeulen Silvia Gardin Thierry Adatte Rodolfo Coccioni Karl B Föllmi |
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| Institution: | (1) Institut de Géologie, Université de Neuchatel, Rue Emile Argand 11, CP 158, 2009 Neuchatel, Switzerland;(2) Grand Rue, 04330 Barrême, France;(3) CNRS-UMR 5143 “Paléodiversité et Paléolenvironnement”, case 104, Université Paris 6, 4 Place Jussieu, 75252 Paris Cedex 05, France;(4) Istituto di Geologia e Centro di Geobiologia dell’Università, Campus Scientifico, Località Crocicchia, 61029 Urbino, Italy |
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| Abstract: | The Faraoni Level is a short-lived oxygen-deficient event that took place during the latest Hauterivian. In order to improve
our understanding of the palaeoenvironmental conditions that occurred during this event, we have analysed the contents of
several redox-sensitive trace elements (U, V, Mo, As, Co, Cd, Cu, Zn, Ni, Pb, Cr) from bulk limestone samples of late Hauterivian–early
Barremian age from three reference sections. U, V, Mo and As show consistent and significant enrichments during the Faraoni
event whereas the other redox-sensitive trace elements analysed here are not systematically enriched. In order to explain
this discrepant behaviour, we propose that the Faraoni Level was deposited during a period of anoxic conditions near the sediment–water
interface. The distinctive peaks in U, V, Mo and As contents are traceable throughout the three studied sections and represent
a good correlation tool which helps to identify the Faraoni Level and its equivalents in the western Tethyan realm and outside
of the Tethys. For example, a peak in U contents in upper Hauterivian sediments of the northwestern Pacific realm (ODP leg
185, site 1149) may well be an expression of the Faraoni event in this particular basin. |
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| Keywords: | Hauterivian Barremian Chemostratigraphy Western Tethys Trace metals |
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