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La plate-forme berriaso-valanginienne du Jura méridional aux massifs subalpins ( Ain, Savoie)

Abstract : The Berriasian and Valanginian evolution of the carbonate platform of the southern Jura and the Bauges subalpine massifs (France) has been studied in detail and the major stages have been defined and dated. Sedimentology. The depositional environment comprises the external platform (comprising slope and margin), and the littoral margin. Each environment is represented by several facies. Mineralogy . The mineralogical parageneses (clary minerals, quartz, goethite .. ) vary, both locally and regionally. The " roentgenofacies " (types of X ray diagrams) can be correlated with the microfacies.This renders questionable the concept of minerais acting as time markers, i.e. appearing everywhere in the same time. Stratigraphy . The limits between the Middle Berriasian, U. Berriasian, L. Valanginian, U. Valanginian and Hauterivian are defined. Four main sequences separated by major discontinuities form one big megasequence. This megasequence is generally transgressive in the Jura, and cyclic in the Bauges. Correlations have been established with the neighbouring Chartreuse massif and with SE France (Provence) Micropa1eontology. The principal benthic species of the during both Berriasian and Valanginian times have been studied and they have been fitted in their paleoecologic context. The latter is quite similar to the Urgonian one but for trocholinae substituting for the urgonian orbitolinae.
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Submitted on : Friday, October 22, 2010 - 3:45:33 PM
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  • HAL Id : tel-00528821, version 1

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Colette Darsac. La plate-forme berriaso-valanginienne du Jura méridional aux massifs subalpins ( Ain, Savoie). Minéralogie. Université Scientifique et Médicale de Grenoble, 1983. Français. ⟨tel-00528821⟩

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