The palaeoenvironmental context of Toarcian vertebrate-yielding shales of southern France (Hérault)

نویسندگان

چکیده

Abstract The Early Jurassic was marked by several episodes of rapid climate changes and environmental perturbation. These culminated during the Toarcian Oceanic Anoxic Event (T-OAE), an episode global warming that led to widespread deposition organic-rich shales. shales NW Europe have also yielded exceptionally preserved fossils marine vertebrates invertebrates, but potential links between occurrences these T-OAE remain poorly investigated. Palaeontological excavations realised in strata near Lodève (Hérault, S France) specimens abundant invertebrate fauna. We developed a multi-proxy approach (ammonite biostratigraphy, XRD-bulk mineralogy, Rock-Eval pyrolysis, stable isotopes, trace element, phosphorus mercury contents) place findings well-defined temporal palaeoenvironmental context, hence constrain factors their remarkable preservation. Jenkyns interval, unambiguously identified at base 5 ‰ negative carbon isotope excursion (CIE), records higher fluxes, which suggest causal link with intense volcanic activity Karoo-Ferrar large igneous province. This interval is very condensed unfossiliferous, might been deposited under abnormally low salinity conditions. Our data show vertebrate-yielding horizons post-dated hundreds kyr, took prolonged period oxygen-deficiency elevated burial. results indicate unusual richness studied site can be explained combination regional such as warming-induced, seafloor anoxia, more local factors, extreme condensation due reduced dilution carbonate detrital input. Supplementary material https://doi.org/10.6084/m9.figshare.c.5509789

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ژورنال

عنوان ژورنال: Geological Society, London, Special Publications

سال: 2021

ISSN: ['2041-4927', '0305-8719']

DOI: https://doi.org/10.1144/sp514-2021-16