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Carbon isotope (δ13Ccarb) stratigraphy of the Early–Middle Ordovician (Tremadocian–Darriwilian) carbonate platform in the Tarim Basin, NW China: implications for global correlations

Published online by Cambridge University Press:  14 July 2020

Xiaoqun Yang Open the ORCID record for Xiaoqun Yang [Opens in a new window] ,
Zhong Li ,
Tailiang Fan ,
Zhiqian Gao  and
Shuai Tang
Xiaoqun Yang
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029, China
Zhong Li
Affiliation:
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029, China
Tailiang Fan*
Affiliation:
School of Energy Resources, China University of Geosciences, Beijing100083, China
Zhiqian Gao
Affiliation:
School of Energy Resources, China University of Geosciences, Beijing100083, China
Shuai Tang
Affiliation:
University of Science and Technology Beijing, Beijing100083, China
*
Author for correspondence: Tailiang Fan, Email: sidiansi@126.com
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Abstract

Guided by conodont biostratigraphy and unconformities observed in the field, stable carbon isotopic analysis (δ13Ccarb) was performed on 210 samples from Lower–Middle Ordovician (Tremadocian to Darriwilian) sections and wells in the Tarim Basin, NW China. The δ13C trend in the Tarim Basin sections has three distinct characteristics: (1) from the Tremadocian to the Floian, a positive shift from −1.9 ‰ to −0.2 ‰ is observed near the boundary between the Penglaiba Formation and the Yingshan Formation; (2) from the Floian to the Dapingian, a positive shift in δ13C from −3 ‰ to −0.7 ‰ occurred under large-scale sea-level rise and a change in the sedimentary environment from a restricted platform to an open platform. Changes in the conodont type are also observed in the Tabei region; and (3) from the Dapingian to the Darriwilian, δ13C first decreased and then increased, showing a negative shift at the Dapingian–Darriwilian boundary. During the Floian, δ13C decreased in the study area, while it first decreased and then increased in other regions, which may reflect local sea-level movements in response to isostatic crustal movements. Two types of positive shift were identified at the Floian–Dapingian boundary, which likely show the effects of local factors, including a disconformity, dolomitization, and platform restriction, superimposed on the global signal of the carbon isotope. Some conodont zonations and recurrent negative excursions in Tremadocian, Floian and Dapingian stages appear to be truncated by unconformities, which are accompanied by short-term subaerial exposure due to sea-level fall and local tectonic uplift.

Keywords

carbon isotopesconodont biostratigraphyunconformityOrdovicianTarim Basin
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 3 , March 2021 , pp. 487 - 508
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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