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Early Toarcian black shales: a response to an oceanic anoxic event or anoxia in marginal basins?

McArthur, J; (2019) Early Toarcian black shales: a response to an oceanic anoxic event or anoxia in marginal basins? Chemical Geology , 522 pp. 71-83. 10.1016/j.chemgeo.2019.05.028. Green open access

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Abstract

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) × 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.

Type: Article
Title: Early Toarcian black shales: a response to an oceanic anoxic event or anoxia in marginal basins?
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.chemgeo.2019.05.028
Publisher version: https://doi.org/10.1016/j.chemgeo.2019.05.028
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Toarcian, Mo, Cd, OAE, TOAE, Cleveland Basin, palaeo-proxy
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10074754
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