Géochimie organique des séries argilo-carbonatées du Callovo-Oxfordien de l'Est du bassin de Paris et d'Angleterre : Variabilités et implications paléoenvironnementales

Abstract : The Callovo-Oxfordian claystones from the East of the Paris basin are studied by Andra in order to test the feasibility of a possible storage of radioactive waste. The molecular analysis of their organic matter indicates that they can be considered as homogenous from their organic content point of view because they are characterized by only one molecular facies. However, the transition to the surrounding limestones is underlined by a major evolution of the molecular facies indicating a change and an increase of the variability of the deposition and diagenesis conditions. The evolution of the distribution of the plant biomarkers indicates, at the end of the Lower Oxfordian, a paleofloristic change characterized by the increase of the proportion of Pinaceae (a conifer family) or their forerunners on the London-Brabant massif. This paleofloristic evolution reflects a paleoclimatic change characterized by the increase of aridity at the global scale. Other complementary results get on other sedimentary series of similar ages highlight the occurrence of a period of water anoxia during the Middle Callovian which certainly happened on the major part of the Western Europe. This event could be at the origin of the crisis of the carbonate production at the Dogger/Malm transition. On the other hand, an experimental technique based on artificial maturation of extant plants has been developed and will allow the acquisition of new palaeochemotaxonomic data. These data will contribue to a better interpretation of plant biomarker assemblages in terms of palaeofloristic composition
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Yann Hautevelle. Géochimie organique des séries argilo-carbonatées du Callovo-Oxfordien de l'Est du bassin de Paris et d'Angleterre : Variabilités et implications paléoenvironnementales. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10153⟩. ⟨tel-01746955⟩

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