Journal
CHEMICAL GEOLOGY
Volume 522, Issue -, Pages 71-83Publisher
ELSEVIER
DOI: 10.1016/j.chemgeo.2019.05.028
Keywords
Toarcian; Mo; Cd; OAE; TOAE; Cleveland Basin; Palaeo-proxy
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The Early Toarcian, organic-rich, black shales of the Cleveland Basin, Yorkshire UK, are the type sediments for the supposed early Toarcian oceanic anoxic event. The sediments have values of Cd/Mo that are < 0.1 and values of Co (mg/kg) x Mn (%) that are > 0.4. These values are typical of sediment deposited in modern basins that are hydrographically restricted and show that the Cleveland Basin was hydrographically restricted when depositing organic-rich sediments. These palaeo-proxies confirm earlier interpretations, based on Mo/TOC values, that argued for hydrographic restriction. The term Toarcian oceanic anoxic event can now be discarded.
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