Unusual accumulations of chert developed worldwide over tens of millions of years during the Permian Period, and they are referred to as the Permian Chert Event. Middle Permian cherts, in the forms of nodules and bedded cherts, are widely distributed in the Yangtze region. A comprehensive study was conducted on middle Permian cherts from the Xibeixiang section on the northern margin of the Upper Yangtze region. This study combined micropaleontology and geochemical analyses to determine the ages, paleo-oceanic conditions, and implications of the Permian Chert Event. Identification of conodonts and brachiopods showed that the Xibeixiang cherts belong to the late Capitanian Jinogondolella granti zone. The Xibeixiang cherts can be divided into two subunits. The lower section (Sc1) consists of a thin interbedded layer of bedded chert, shale, and limestone, which were strongly influenced by upwelling with relatively low temperatures. The upper section (Sc2) comprises a thin interbedded layer of bedded chert and shale. The intermediate chemical index of alteration (CIA) values of Sc2 suggest a temperature increase compared to Sc1 and a weakening of upwelling activity. The Sc2 section of the Xibeixiang cherts is consistent with the end-Capitanian oceanic anoxic event and coincides in time with the end-Guadalupian biotic crisis, supporting a connection between the biotic crisis and marine anoxia. The Permian Chert Event distributions in the Guadalupian Epoch exhibit substantial temporal and spatial heterogeneity on a global scale. Alterations in the oceanic environment likely caused the shoaling of the lysocline and calcite compensation depth (CCD). This allowed cherts to be deposited instead of carbonates, even in relatively shallow-marine areas, such as continental margin environments.
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Research Article|
January 08, 2025
Early Publication
Origin and paleo-oceanic conditions of Guadalupian bedded chert in the northern margin of the Upper Yangtze region: Implication for marine anoxia and the Permian Chert Event
Yu Yu;
Yu Yu
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
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Liangbiao Lin;
Liangbiao Lin
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
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Qian Li;
Qian Li
3
School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
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Gang Lu;
Gang Lu
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
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Fengbin Liu;
Fengbin Liu
2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
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Fanchi Nan
Fanchi Nan
2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
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Yu Yu
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
Liangbiao Lin
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
Qian Li
3
School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
Gang Lu
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
Fengbin Liu
2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
Fanchi Nan
2
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
Publisher: Geological Society of America
Received:
13 Dec 2023
Revision Received:
18 Nov 2024
Accepted:
16 Dec 2024
First Online:
08 Jan 2025
Online ISSN: 1943-2674
Print ISSN: 0016-7606
© 2025 Geological Society of America
GSA Bulletin (2025)
Article history
Received:
13 Dec 2023
Revision Received:
18 Nov 2024
Accepted:
16 Dec 2024
First Online:
08 Jan 2025
Citation
Yu Yu, Liangbiao Lin, Qian Li, Gang Lu, Fengbin Liu, Fanchi Nan; Origin and paleo-oceanic conditions of Guadalupian bedded chert in the northern margin of the Upper Yangtze region: Implication for marine anoxia and the Permian Chert Event. GSA Bulletin 2025; doi: https://doi.org/10.1130/B37506.1
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