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Palaeoenvironmental significance of Toarcian black shales and event deposits from southern Beaujolais, France

Published online by Cambridge University Press:  07 February 2013

GUILLAUME SUAN ,
LOUIS RULLEAU ,
EMANUELA MATTIOLI ,
BAPTISTE SUCHÉRAS-MARX ,
BRUNO ROUSSELLE ,
BERNARD PITTET ,
PEGGY VINCENT ,
JEREMY E. MARTIN ,
ALEX LÉNA  and
JORGE. E. SPANGENBERG
...Show all authors
GUILLAUME SUAN*
Affiliation:
Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, D-60438 Frankfurt am Main, Germany Institute of Earth Sciences, University of Lausanne, Géopolis, CH-1015 Lausanne, Switzerland UMR CNRS 5276 LGLTPE, Université Lyon 1, Campus de la Doua, Bâtiment Géode, F-69622 Villeurbanne Cedex, France
LOUIS RULLEAU
Affiliation:
Espace Pierres Folles, 116 chemin du Pinay, F-69380, St Jean des Vignes, France
EMANUELA MATTIOLI
Affiliation:
UMR CNRS 5276 LGLTPE, Université Lyon 1, Campus de la Doua, Bâtiment Géode, F-69622 Villeurbanne Cedex, France
BAPTISTE SUCHÉRAS-MARX
Affiliation:
Department of Earth Sciences, Palaeobiology Programme, Uppsala University, Villavägen 16, Uppsala, SE-75 236, Sweden
BRUNO ROUSSELLE
Affiliation:
Espace Pierres Folles, 116 chemin du Pinay, F-69380, St Jean des Vignes, France
BERNARD PITTET
Affiliation:
UMR CNRS 5276 LGLTPE, Université Lyon 1, Campus de la Doua, Bâtiment Géode, F-69622 Villeurbanne Cedex, France
PEGGY VINCENT
Affiliation:
Staatliches Museum für Naturkunde, Rosenstein 1, D-70191 Stuttgart, Germany
JEREMY E. MARTIN
Affiliation:
School of Earth Sciences, University of Bristol, BS8 1RJ, Bristol, United Kingdom
ALEX LÉNA
Affiliation:
UMR CNRS 5276 LGLTPE, Université Lyon 1, Campus de la Doua, Bâtiment Géode, F-69622 Villeurbanne Cedex, France
JORGE. E. SPANGENBERG
Affiliation:
Institute of Earth Sciences, University of Lausanne, Géopolis, CH-1015 Lausanne, Switzerland
KARL B. FÖLLMI
Affiliation:
Institute of Earth Sciences, University of Lausanne, Géopolis, CH-1015 Lausanne, Switzerland
*
§Author for correspondence: guillaume.suan@univ-lyon1.fr
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Abstract

New sedimentological, biostratigraphical and geochemical data recording the Toarcian Oceanic Anoxic Event (T-OAE) are reported from a marginal marine succession in southern Beaujolais, France. The serpentinum and bifrons ammonite zones record black shales with high (1–10 wt%) total organic carbon contents (TOC) and dysoxia-tolerant benthic fauna typical of the ‘Schistes Carton’ facies well documented in contemporaneous nearby basins. The base of the serpentinum ammonite zone, however, differs from coeval strata of most adjacent basinal series in that it presents several massive storm beds particularly enriched in juvenile ammonites and the dysoxia-tolerant, miniaturized gastropod Coelodiscus. This storm-dominated interval records a marked negative 5‰ carbonate and organic carbon isotope excursion being time-equivalent with that recording storm- and mass flow-deposits in sections of the Lusitanian Basin, Portugal, pointing to the existence of a major tempestite/turbidite event over tropical areas during the T-OAE. Although several explanations remain possible at present, we favour climatically induced changes in platform morphology and storm activity as the main drivers of these sedimentological features. In addition, we show that recent weathering, most probably due to infiltration of O2-rich meteoric water, resulted in the preferential removal of 12C-enriched organic carbon, dramatic TOC loss and total destruction of the lamination of the black shale sequence over most of the studied exposure. These latter observations imply that extreme caution should be applied when interpreting the palaeoenvironmental significance of sediments lacking TOC enrichment and lamination from outcrops with limited surface exposures.

Keywords

Toarcian Oceanic Anoxic EventSchistes Cartonoxygen-deficiencyorganic-rich depositsweatheringcarbon isotope excursionammonitesevent deposits
Type
Original Articles
Information
Geological Magazine , Volume 150 , Issue 4 , July 2013 , pp. 728 - 742
Copyright
Copyright © Cambridge University Press 2013 

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