Estimation of the maximum burial palaeotemperature for Toarcian and Callovo-Oxfordian samples in the central part of the Paris Basin using organic markers.

Abstract : The thermal history of the central part of the Paris basin is reconstructed using C31 hopane S/R isomerisation ratios and organic matter transformation ratios measured on Lower Toarcian and Callovo-Oxfordian samples. Maximum burial palaeotemperatures range between 90 and 115 °C for the Toarcian shales, and between 75 and 95 °C for the Callovo-Oxfordian samples, from the East to the centre of the basin, respectively. The amount of Late Cretaceous erosion was evaluated to be between ca. 400 to 600 m in the eastern part of the studied area and 100 to 300 m in the centre of the basin.