Abstract
Molinges was located on an Upper Jurassic ramp system of low-energy regime that developed at the southern margin of the French Jura platform. The sedimentary succession is characterized by the transition from a mixed siliciclastic-carbonate to a carbonate depositional setting that occurred during a long-term shallowing-upward trend. The disappearance of siliciclastics is explained by a climatic change, from humid and cold to drier and warmer conditions, previously identified in Late Oxfordian adjacent basins. The base of the section shows marl-limestone alternations of outer ramp. In its middle part, the section displays oncolitic marls, coral-microbialite beds and oncolitic limestones that deposited in a mid ramp position. Finally, the upper section part is made of oolitic limestones of inner ramp. In outer- to mid-ramp settings submitted to terrigenous inputs, the stacking pattern of deposits and facies evolution allow the identification of elementary, small-, medium-, and large-scale sequences. Small amplitudes of sea-level variations probably controlled rapid shifts of facies belts and reef window occurrences. In small-scale sequences, the coral beds developed during periods of sea-level rise. The decreasing rate of sea-level rise is marked by the downramp shift of the oncolitic limestone belt that led to the demise of coral-microbialite beds. These bioconstructions are mainly represented by thin biostromes in which corals never reach great sizes. The coral assemblages mainly include the genera Enallhelia, Dimorpharaea, Thamnasteria, and some solitary forms (Montlivaltia and Epistreptophyllum). They suggest relatively low-mesotrophic conditions in marine waters during the edification of the primary framework. Relatively cold water temperatures and periods of more elevated nutrient contents are probably responsible of the reduced coral development and the formation of a large amount of microbialites.
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This work has been funded by the National Science Research Council of France (UMR CNRS 5125 “Paléoenvironnements et paléobiosphère”, Lyon). The authors are grateful to Elsa Cariou and Raymond Enay for the ammonite sampling and determination. We are grateful to Gishlaine Broillet for thin-section preparation. Stéphanie Védrine, Beatriz Bádenas and André Freiwald are acknowledged for their comments which greatly improved the quality of this work.
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Olivier, N., Colombié, C., Pittet, B. et al. Microbial carbonates and corals on the marginal French Jura platform (Late Oxfordian, Molinges section). Facies 57, 469–492 (2011). https://doi.org/10.1007/s10347-010-0246-9
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DOI: https://doi.org/10.1007/s10347-010-0246-9