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L'Urgonien du bassin d'Organya (NE Espagne) : micropaléontologie, sédimentologie et stratigraphie séquentielle

Abstract : The study of the Urgonian sediments of Organyà Basin has permitted to characterise the sedimentary sequences deposited in this basin. Detailed sedimentary and facies studies allow us to propose a microfacies depositional model used for a good knowledge of the vertical evolution of sedimentary environment. An exhaustive inventory of microfauna and microflora has been presented. Owning the micropaleontological and sedimentologieal data 6 sedimentary sequences have identified. In comparison with the foraminifera distribution well known in other alpine basins, the OR-0 sequence is dated from Valanginian age, the OR-1, OR-2 and OR-3 sequences as Upper Barremian and the last ones (OR-4 and OR-5 sequences) as Lower Aptian. Four main types of sediments has been identified: - silty limestone with terrigenous influence in the OR-0 sequence; - shelf-margin and inner platform limestone in the OR-1 sequence and OR-2 sequence respectively; - charophytes limestone at the base of OR-3 and OR-4 sequences and, - planctonik foraminifera and rich anoxie lime stone in the OR-4 and OR-5 sequences. Sequence stratigraphy of this region is now detailed, due to quantification of the microfauna, specially useful to distinguish the different systems tracts. Two anoxic episodes are observed at the top of the Urgonian sediments; they are correlated with one of the global Cretaceous Oceanic Anoxie Events (OAE 1a).
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Submitted on : Monday, August 13, 2012 - 10:17:40 AM
Last modification on : Friday, March 25, 2022 - 11:08:44 AM
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  • HAL Id : tel-00723708, version 1



Josep-Maria Bernaus. L'Urgonien du bassin d'Organya (NE Espagne) : micropaléontologie, sédimentologie et stratigraphie séquentielle. Stratigraphie. Université Joseph-Fourier - Grenoble I, 1998. Français. ⟨tel-00723708⟩



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