Conodont Biostratigraphy across the Permian-Triassic Boundary at the Xinmin Section, Guizhou, South China

A continuous sedimentation at the Xinmin Section, Anshun, Guihzou Province, with the Upper Permian Talung Formation dominated by bedded siliceous rocks, and the Lower Triassic Luolou Formation consisting mudstones and marls as well as siliceous mudstones at its basal part indicates that it represent...

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Bibliographic Details
Published in:Journal of earth science (Wuhan, China) China), 2014-10, Vol.25 (5), p.779-786
Main Authors: Zhang, Ning, Jiang, Haishui, Zhong, Wenli, Huang, Haohao, Xia, Wenchen
Format: Article
Language:English
Subjects:
Biogeosciences
Chert
Cherts
China
Earth and Environmental Science
Earth science
Earth Sciences
Formations
Geochemistry
Geology
Geotechnical Engineering & Applied Earth Sciences
Mudstone
Permian
Permian-Triassic boundary
Rocks
Sedimentation
Sedimentation & deposition
Siliceous rocks
Stratigraphy
Triassic
Zonation
三叠系
中国
二叠系
层状硅质岩
牙形石带
生物地层框架
界线
贵州
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Summary:A continuous sedimentation at the Xinmin Section, Anshun, Guihzou Province, with the Upper Permian Talung Formation dominated by bedded siliceous rocks, and the Lower Triassic Luolou Formation consisting mudstones and marls as well as siliceous mudstones at its basal part indicates that it represents a deeper-water basinal facies across the Permian-Triassic boundary. Based on a systematic conodont biostratigraphic work, nine conodont species belong to two genera have been identified in this study. It enable us to establish five conodont zones at this section, in ascending order, they are： Clarkina changxingensis Zone（beds 1-3-4-2）, Clarkina yini Zone（beds 4-3-5-1-1）, Clarkina meishanensis Zone（beds 5-1-2-5-2）, Hindeodus changxingensis Zone（beds 5-3-1-5-3-2） and Hindeodus parvus Zone（beds 5-3-3-5-3-4）, respectively. According to the first occurrence of Hindeodus parvus in bed 5-3-3, the Permian-Triassic boundary is placed at the base of bed 5-3-3. This conodont zonation of the Xinmin Section provides precise biostratigraphic framework for further investigations on the geological events across the Permian-Triassic boundary at this section. In addition, the new conodont data also reveals that several siliceous beds occurred at the basal Triassic. It provides an exception of Early Triassic Chert Gap.
ISSN:1674-487X
1867-111X
DOI:10.1007/s12583-014-0472-0