Growth and demise of the Jurassic carbonate platform in the intracratonic Paris Basin (France): Interplay of climate change,eustasy and tectonics |
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| Institution: | 1. Institut für Geologie, Leibniz Universität Hannover, Callinstraβe 30, 30167 Hannover, Germany;2. Institut de Physique du Globe de Strasbourg, EOST, Université de Strasbourg, 1 rue Blessig, 67084 Strasbourg Cedex, France;3. Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätstrasse 150, 44801 Bochum, Germany;4. Department of Environment, Earth and Ecosystems, The Open University, Milton Keynes MK7 6AA, United Kingdom;5. Institut für Erd- und Umweltwissenschaften, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany;6. Institut de Géologie et Paléontologie, Université de Lausanne, Géopolis, 1015 Lausanne, Switzerland;1. Université de Lorraine, CNRS, Lab. GeoRessources UMR 7359, BP 70239, 54506 Vandoeuvre-lès-Nancy Cedex, France;2. 256 R Alexandre André, 45240 Ligny Le Ribault, France;3. Chrono-Environnement Université de Franche-Comté, 16 route de Gray, 25030 Besançon cedex, France;4. Laboratoire de Géologie de Lyon, Terre, Planètes et Environnement, Université Claude Bernard Lyon 1 et Ecole Normale Supérieure de Lyon, 2 rue Raphaël Dubois, 69622 Villeurbanne Cedex, France;5. UMR 7517 EOST, Université Louis Pasteur, 1 rue Blessig, F 67084 Strasbourg Cedex, France;6. RCJ—Office de la culture, Paléontologie A16 Hôtel des Halles, Case postale 64, CH-2900 Porrentruy, Switzerland;7. Circuit de la Pierre Commercy ADCPE—Villasatel, Hameau des Carrières, 55 200 Euville, France;8. ANDRA DS/Milieu Géologique 1/7, rue Jean Monnet F, 92290 Châtenay-Malabry Cedex, France;9. SNSB-Bayerische Staatssammlung für Paläontologie und Geologie and GeoBioCenter LMU, Richard-Wagner-Str. 10, D-80333 München, Germany;1. DiST, Dipartimento di Scienze e Tecnologie, Università degli Studi di Napoli “Parthenope”, 80143 Napoli, Italy;2. Geological Institute, ETH Zürich, 8092 Zürich, Switzerland |
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| Abstract: | It is usually very difficult to identify and quantify the relative influence of tectonics, eustasy and climate on carbonate system evolution from sedimentary records. In order to improve our understanding of these mechanisms, we have traced for the first time, the evolution of the eastern Paris Basin platform throughout the entire Jurassic period. This carbonate platform underwent eight successive growth and demise phases, with different depositional profiles ranging from ramps to flat-topped geometries. The eight carbonate growth periods are compared with the standard sea-level curves, local tectonic regimes and recently published oxygen-isotope and/or clay mineralogy databases. Prograding heterozoan facies along ramp profiles mark periods dominated by second-order eustatic sea-level rise, relatively cool sea surface temperatures, and mesotrophic and humid conditions (Hettangian, Pliensbachian, late Oxfordian, Tithonian). During these periods, variable detrital contents in the sedimentary succession hampered the efficiency of shallow-marine carbonate factories. Higher sea surface temperatures, oligotrophic and humid conditions associated with either eustatic sea-level rise or very high local subsidence occurred during the early Bajocian and the mid-Oxfordian. These seawater properties seem to have favoured the aggradation of scleractinian corals forming dome-shaped bioherm buildups. An oolitic and lime-mud carbonate system, deposited during the Bathonian second-order eustatic sea-level fall, is characterised by miliolid-rich micritic facies on a rimmed-ramp under stable, cooler and drier conditions. The second-order maximum flooding associated with a sea surface temperature decline and/or a seawater eutrophication caused at least five carbonate demise periods (i.e. Toarcian, earliest late Bajocian, Callovian/Oxfordian transition, earliest late Oxfordian and Kimmeridgian). |
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| Keywords: | Carbonate Platform Facies Sequence stratigraphy Jurassic Palaeoclimate |
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