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Carbon sequestration in an expanded lake system during the Toarcian oceanic anoxic event.

Xu, W. and Ruhl, M. and Jenkyns, H. and Hesselbo, S. and Riding, J. and Selby, D. and Naafs, D. and Weijers, J. and Pancost, R.D. and Tegelaar, E.W. and Idiz, E. (2017) 'Carbon sequestration in an expanded lake system during the Toarcian oceanic anoxic event.', Nature geoscience., 16 (2). pp. 129-134.

Abstract

The Early Jurassic Toarcian oceanic anoxic event (~183 Ma) was marked by marine anoxia–euxinia and globally significant organic-matter burial, accompanied by a major global carbon-cycle perturbation probably linked to Karoo–Ferrar volcanism. Although the Toarcian oceanic anoxic event is well studied in the marine realm, accompanying climatic and environmental change on the continents is poorly understood. Here, utilizing radioisotopic, palynological and geochemical data from lacustrine black shales, we demonstrate that a large lake system developed contemporaneously with the Toarcian oceanic anoxic event in the Sichuan Basin, China, probably due to enhanced hydrological cycling under elevated atmospheric pCO 2. We attribute increased lacustrine organic productivity to elevated fluvial nutrient supply, which resulted in the burial of ~460 Gt of organic carbon in the Sichuan Basin alone, creating an important negative feedback in the global exogenic carbon cycle. We suggest that enhanced nutrient delivery to marine and large lacustrine systems was a key component in the global carbon cycle recovery during the Toarcian oceanic anoxic event and acted to shorten the duration of the recovery of global δ13C values.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1038/ngeo2871
Date accepted:08 December 2016
Date deposited:22 February 2017
Date of first online publication:16 January 2017
Date first made open access:16 July 2017

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