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Large perturbations of the carbon and sulfur cycle associated with the Late Ordovician mass extinction in south China

Tonggang Zhang, Yanan Shen, Zhan Renbin, Shen Shuzhong and Chen Xu
Large perturbations of the carbon and sulfur cycle associated with the Late Ordovician mass extinction in south China
Geology (Boulder) (April 2009) 37 (4): 299-302

Abstract

High-resolution delta (super 13) C data of organic carbon from a continuous section of the Late Ordovician-Early Silurian reveal two positive delta (super 13) C excursions that are associated with the mass extinction in South China. The first stratigraphic delta (super 34) S measurements on pyrite tied to well-established biostratigraphy indicate a large perturbation of the sulfur cycle, consistent with major sea-level changes related to the glaciation. The elevated delta (super 34) S values of pyrites and a large, short-lived negative delta (super 34) S excursion of approximately 20 per mil associated with the decay of the glaciation suggest deep-water anoxia during the Hirnantian Stage, in contrast to the conventional view that the global oceans were oxygenated. We suggest that deep-water anoxia may have contributed to the Late Ordovician mass extinction in South China and possibly elsewhere.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 4
Title: Large perturbations of the carbon and sulfur cycle associated with the Late Ordovician mass extinction in south China
Affiliation: University of Quebec at Montreal, Canada Research Chairs Program in Biogeochemistry, Montreal, QC, Canada
Pages: 299-302
Published: 200904
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 27
Accession Number: 2009-041039
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009078
Illustration Description: illus. incl. sketch map
N27°30'00" - N28°00'00", E106°00'00" - E107°00'00"
Secondary Affiliation: Chinese Academy of Sciences, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200922
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