Contributions du thermomètre Δ47 et du chronomètre U-Pb à l’étude de l’histoire diagénétique, thermique, et hydrogéologique des réservoirs carbonatés du Jurassique Moyen du bassin de Paris

Abstract : Diagenesis studies of both siliciclastic and carbonate rock units face the difficulty of constraining the temperature and age of the successive episodes of mineral crystallization. The first objective of this PhD work was to test the potential of two recent isotopic tools (the "clumped isotopes" Æ47 geothermometer and the laser ablation U-Pb geochronometer ) to integrate conventional carbonate diagenesis studies. The second objective was to reconstruct the diagenetic, thermal, and hydrogeological histories of the Middle Jurassic carbonate reservoirs of the Paris Basin. To achieve these goals, we studied calcite and dolomite cements mostly collected in the basin subsurface (exploration cores). The good petrographical and sedimentological characterization of the studied samples, together with the analysis of fluid inclusions and ?47 thermometry for determining the temperature and the chemical and isotopic compositions of the mineralizing fluids, allowed us to reach several first-order information. First, we show that Æ47 allows to simultaneously and precisely reconstruct the formation temperature of diagenetic cements in the range 60-100 ¡C (with an accuracy of ~ 3-5 ¡C) and the oxygen isotopic composition of the parent fluids (d18Owater) with a precision of ~ 1 ä. Secondly, this work improves our knowledge on the thermal history and past fluid-flows occurring at the basin scale. In particular, the coupling of the Æ47 thermometer with the U-Pb chronometer permitted for the first time to set absolute thermo-chronological constraints on every fluid-flow episodes investigated. More broadly, this unprecedented Æ47/(U-Pb) coupling reveals a new field of application in the low-temperature thermo-chronology field (10-100 ¡C). We anticipate that this pioneer thermo-chronological approach will induce many future applications in the study of sedimentary basins via carbonate diagenesis studies
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Xavier Mangenot. Contributions du thermomètre Δ47 et du chronomètre U-Pb à l’étude de l’histoire diagénétique, thermique, et hydrogéologique des réservoirs carbonatés du Jurassique Moyen du bassin de Paris. Sciences de la Terre. Université Sorbonne Paris Cité, 2017. Français. ⟨NNT : 2017USPCC276⟩. ⟨tel-02173800⟩

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