Minéralisations et structuration d'une marge continentale passive : l'exemple des concrétions tubulaires du bassin subalpin (Callovien-Oxfordien)

Abstract : The purpose of this work is: - to distinguish the witnesses of the circulations of fluids and the diagenetic contribution (early and / or late), by a fine petrographic, mineralogical and crystallochemical study of the tubular concretions and their marly-calcareous host formation - to determine if these objects are possible markers of geodynamic events, in an environment where the indicators are particularly few. In parallel, a palaeontological and palaeoecological study of Beauvoisin-type fossiliferous deposits is undertaken (Rolin, 1987) in order to highlight the singular character of these faunistic associations and its eventual link with the circulation of fluids that we propose to distinguish. At first, before examining the concretions and their mineralization, we retrace the alpine evolution quite precisely, to put these structures in their geodynamic context. Then, the actual study of concretions is approached in several stages, with an approach identical to that of the metallogenists, during which we specify: - their distribution and their geometric relations with the marly-calcareous host formation, - the typology of the mineralization and its characteristics, on the one hand, and the conditions of formation of the minerals which compose it, on the other hand, according to the different diagenetic and hydrothermal environments, according to the data of the literature, - differences and similarities, mineralogical or chemical, between the clay-carbonate carbonate cortical part and the marly surrounding. Finally, all the results and the conclusions highlighted make it possible to propose a model of formation of concretions, in the current state of our knowledge and by comparison with known mineralizations, as well as a link with the alpine geodynamic evolution, in general, and the salt tectonics of the Triassic, in particular.
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Jean-Luc Gaidon. Minéralisations et structuration d'une marge continentale passive : l'exemple des concrétions tubulaires du bassin subalpin (Callovien-Oxfordien). Minéralogie. Université Claude Bernard - Lyon 1, 1988. Français. ⟨tel-02290384⟩

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