Evolution of depositional settings in the Torrey area during the Smithian (Early Triassic, Utah, USA) and their significance for the biotic recovery

作者: Nicolas Olivier , Arnaud Brayard , Emmanuelle Vennin , Gilles Escarguel , Emmanuel Fara

DOI: 10.1002/GJ.2663

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摘要: This work focuses on well-exposed Lower Triassic sedimentary rocks in the area of Torrey (south-central Utah, USA). The studied Smithian deposits record a large-scale third-order sea-level cycle, which permits detailed reconstruction evolution depositional settings. During middle Smithian, peritidal microbial limestones associated with rather low-diversity benthic fauna were deposited seaward tidal flat siliciclastic red beds. Associated siliceous sponges, formed small m-scale patch reefs. late to interval, system is characterized by dolostones an interior platform, ooid-bioclastic tide-dominated shoal complex, and mid-shelf bioclastic limestones. Microbial deposits, corresponding sparse stromatolites are contemporaneous well-diversified marine living complex area. nature distribution these not related any particular deleterious environmental condition, highlighting that observed patterns biotic recovery after end-Permian mass extinction directly influenced Facies stratal stacking allow us identify large, medium small-scale, as well elementary sequences. Large- medium-scale sequences consistent changes, whereas small-scale better explained autocyclic processes.

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