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Katian (Upper Ordovician) carbon isotope chemostratigraphy in the Neixiang area, central China: implications for intercontinental correlation

Published online by Cambridge University Press:  17 May 2019

Xiuchun Jing Open the ORCID record for Xiuchun Jing [Opens in a new window] ,
Svend Stouge ,
Yufeng Tian ,
Xunlian Wang  and
Hongrui Zhou
Xiuchun Jing*
Affiliation:
State Key Laboratory of Geobiology and Environmental Geology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China School of Earth Sciences and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
Svend Stouge
Affiliation:
Natural History Museum of Denmark, Geological Museum, Earth and Planetary System Science Section, University of Copenhagen, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark
Yufeng Tian
Affiliation:
School of Earth Sciences and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
Xunlian Wang
Affiliation:
State Key Laboratory of Geobiology and Environmental Geology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China School of Earth Sciences and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
Hongrui Zhou
Affiliation:
School of Earth Sciences and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
*
Author for correspondence: Xiuchun Jing, Email: jxch@cugb.edu.cn
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Abstract

The Katian (Upper Ordovician) Shiyanhe Formation at the Sigang section, Neixiang area, Henan Province, central China, has been investigated for carbon isotope (δ13Ccarb) chemostratigraphy. The carbon isotopic data document signal between the two major Ordovician positive shifts in δ13C, the early Katian Guttenberg and the Hirnantian excursions. The Kope (Ka1/2), Fairview (Ka2/3), Waynesville (Ka3/4), Whitewater (Ka4) excursions and a doubtful Elkhorn (Ka4) excursion are identified herein. The continuous and well-defined conodont zonal succession of the Sigang section provides a secure biostratigraphic framework for the mid-late Katian carbon isotope chemostratigraphy in China. Correlation between carbon-isotope data curve and the relative sea-level changes shows no clear correspondence, and hence the sea-level change is probably not the main driver of δ13C excursions during the Katian. Intercontinentally, the mid–late Katian carbon isotope excursions, identified mainly in the North American and Baltoscandian successions, are useful for improving long-distance stratigraphic correlations. This further suggests that these excursions represent global perturbations in the carbon cycle.

Keywords

carbon isotope stratigraphyChinaKatianLate OrdovicianShiyanhe Formation
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 12 , December 2019 , pp. 2053 - 2066
Copyright
© Cambridge University Press 2019 

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