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Correlation of reefal Oxfordian episodes and climatic implications in the eastern Paris Basin (France)

Authors

  • Cédric Carpentier,

    1. UMR CNRS 7566 Laboratoire G2R Géologie et Gestion des Ressources Minérales et Energétiques, Université Henri Poincaré Nancy 1, BP 239 54506 Vandoeuvre-lès-Nancy Cedex, France
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  • Bertrand Martin-Garin,

    1. UMR CNRS 7566 Laboratoire G2R Géologie et Gestion des Ressources Minérales et Energétiques, Université Henri Poincaré Nancy 1, BP 239 54506 Vandoeuvre-lès-Nancy Cedex, France
    2. Institut für Geologie, Universität Bern, Baltzerstrasse 1, 3012 Bern, Switzerland
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  • Bernard Lathuilière,

    1. UMR CNRS 7566 Laboratoire G2R Géologie et Gestion des Ressources Minérales et Energétiques, Université Henri Poincaré Nancy 1, BP 239 54506 Vandoeuvre-lès-Nancy Cedex, France
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  • Serge Ferry

    1. UMR CNRS 5125 Paléoenvironnements et Paléobiosphère, Université Claude Bernard Lyon1, 2 rue Raphaël Dubois, F-69622 Villeurbanne Cedex, France
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Cédric Carpentier, UMR 7566 G2R, BP 239, BP 239 54506 Vandœuvre-lès-Nancy Cedex, France. Tel.: 03 83 68 47 95 (UHP)/03 83 59 64 25 (ENSG); fax: 03 83 68 47 01; e-mail: cedric.carpentier@g2r.uhp-nancy.fr

Abstract

Oxfordian reefal episodes of Lorraine and Burgundy have a long time been considered as contemporaneous. Biostratigraphic data and sequential evolutions peculiar to each region indicate their structural autonomy during Oxfordian times. A north-south-oriented well-logging transect shows that, during the Middle Oxfordian, a shallow reefal platform developed in Lorraine while thin deeper deposits occurred in Burgundy. In spite of their different ages, reefal episodes of Middle Oxfordian in Lorraine and Upper Oxfordian in Burgundy exhibit a broadly similar vertical evolution of coral communities. During the Late Oxfordian, the contemporaneous occurrence of a diversified assemblage in the Burgundy region, a colder coral assemblage characterized by eurytopic genera and the decrease in seawater isotopic temperatures in Lorraine can be explained by a shift in trophic conditions, a climatic change related to structural rearrangements in this strategic place and a modification of oceanic circulations between the arctic and the Tethyan regions.

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