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A deep marine organic carbon reservoir in the non-glacial Cryogenian ocean (Nanhua Basin, South China) revealed by organic carbon isotopes

Zhao, N; Peng, P; Li, J; Wang, D; Shields, GA; (2019) A deep marine organic carbon reservoir in the non-glacial Cryogenian ocean (Nanhua Basin, South China) revealed by organic carbon isotopes. Precambrian Research , 321 pp. 212-220. 10.1016/j.precamres.2018.12.013. Green open access

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Abstract

The late-Cryogenian warm (non-glacial) interval (c.660 − c.650 Ma) is potentially of great significance to the co-evolution between life and the surface environment during the emergence of animal life on Earth. In this study, three high-resolution organic carbon isotopic (δ13Corg) records for the Datangpo/Xiangmeng Formation on the Yangtze Craton are presented. The data derive from drill cores representing different depositional settings at Daotuo (slope setting), Minle (shallow-water basin), and Xiangtan (basin), respectively. The Daotuo and Minle samples exhibit an overall increase of 6–8‰ as well as significant isotopic fluctuations following the Tiesi'ao/Sturtian glaciation, while samples from the deeper Xiangtan section show relatively muted fluctuations (±1‰) and no overall trend over the same interval. These findings can be plausibly explained by a much longer residence time for marine organic matter, which may have acted as a redox buffer against oxygenation and climate change. The build-up and eventual oxidation of a sub-pycnocline organic carbon reservoir in the redox stratified non-glacial ocean could help to explain the extreme positive and negative carbon isotope perturbations, respectively, in time-equivalent shallow-marine carbonate Platform successions from Mongolia, Australia and Namibia.

Type: Article
Title: A deep marine organic carbon reservoir in the non-glacial Cryogenian ocean (Nanhua Basin, South China) revealed by organic carbon isotopes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.precamres.2018.12.013
Publisher version: http://doi.org/10.1016/j.precamres.2018.12.013
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: Cryogenian non-glacial interval, Nanhua Basin, Organic carbon isotopes, Organic carbon reservoir, Oxygenation
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/10066405
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