Diagenèse précoce en milieu sulfuré réducteur; une étude isotopique dans le Jurassique basal du bassin parisien  [Early diagenesis in a sulphate-reducing environment; an isotopic study in the Lower Jurassic of the Paris Basin]

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doi: 10.1016/S1251-8050(99)80054-8
Alternate Title:Early diagenesis in a sulphate-reducing environment; an isotopic study in the Lower Jurassic of the Paris Basin
Authors:Ader, M.; Javoy, M.
Author Affiliations:Primary:
Institut de Physique du Globe de Paris, Laboratoire de Géochimie des Isotopes Stables, Paris, France
Volume Title:Comptes Rendus de l'Académie des Sciences, Série II. Sciences de la Terre et des Planètes
Source:Comptes Rendus de l'Académie des Sciences, Série II. Sciences de la Terre et des Planètes, 327(12), p.803-809. Publisher: Gauthier-Villars, Montrouge, France. ISSN: 1251-8050
Publication Date:1998
Note:In French with English summary. 24 refs.; 1 table
Summary:Lower Jurasssic argilo-limestones from a continental platform environment have been drilled at Montcornet in the Paris Basin (Andra, 1989). The isotopic analysis of calcite yield δ13C values between -3 and +1% Co, and δ18O between +21 and +27. Depletion in 13C is caused by secondary crystallisation of calcite in a sulphate-reducing environment, where isotopically light dissolved inorganic carbon, resulting from organic matter mineralization, is added into the pore fluids. The depletion in δ18O results from the isotopic equilibrium between pore water and calcite, which is controlled by temperature, fluid/rock ratio and the δ18O of interstitial fluid. This study clearly shows that stable isotopes are a powerful tool for the study of local diagenetic mechanisms, knowledge of which is a key to the understanding of the sedimentary record from geochemical and geophysical points of view.
Sections:Geochemistry
Subsections:Sedimentary rocks
Subjects:C-13; Calcite; Carbon; Carbonate rocks; Carbonates; Clastic rocks; Clastic sediments; Clay; Diagenesis; Early diagenesis; Fluid phase; Isotopes; Jurassic; Limestone; Lower Jurassic; Mesozoic; O-18; Organic carbon; Organic compounds; Oxygen; Reduction; Sedimentary rocks; Sediments; Stable isotopes; Sulfates; Europe; France; Paris Basin; Western Europe
Abstract Numbers:99M/2898
Record ID:1999059908
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France
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