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Evolution of a Late Oxfordian: early Kimmeridgian carbonate platform, French Jura Mountains

Abstract : A detailed facies analysis and interpretation of the evolution of depositional environments along a north–south transect of the Late Oxfordian—Early Kimmeridgian French Jura carbonate platform highlights hierarchically stacked depositional sequences. The identified small- and medium-scale depositional sequences are matched with the precise cyclostratigraphic framework initially established for the Swiss Jura platform. The superimposition of a long-term (2nd order) sea-level rise with long (400 kyr) eccentricity cycles explains most of the French Jura platform architecture. During the Bimammatum and Planula zones, the climate became progressively warmer and more arid, allowing enhanced carbonate production. This resulted in a strong progradation of the French Jura platform that progressively evolved from a ramp to an oolitic rimmed shelf. A brief interval characterized by a more humid climate during the upper Bimammatum Zone caused an increase in siliciclastic and nutrient input, leading to a reduction in carbonate production and strong retrogradation of the platform. During the Platynota and lower Hypselocyclum zones, the shallow inner shelf carbonate production once more exceeded the accommodation, leading to a general aggradation of the platform. From the upper Hypselocyclum Zone, with a more humid climate, the carbonate production did not outweigh the accommodation creation and the platform evolved to a flat-topped shelf. Thus, sea-level changes and climatic conditions (temperature and humidity) are the key factors controlling the nature of the sedimentation and the depositional profile of the French Jura platform during the Late Oxfordian—Early Kimmeridgian.
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Submitted on : Saturday, November 27, 2021 - 7:23:06 AM
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Nicolas Olivier, Elsa Cariou, Pierre Hantzpergue. Evolution of a Late Oxfordian: early Kimmeridgian carbonate platform, French Jura Mountains. Swiss Journal of Geosciences, Springer, 2015, 108 (2-3), pp.273-288. ⟨10.1007/s00015-015-0189-9⟩. ⟨hal-02115001⟩



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