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Radiolarian and detrital zircon in the Upper Carboniferous to Permian Bancheng Formation, Qinfang Basin, and the geological significance

Xue Ke1, Zongyan Zhang2, Jianghai Yang3, 4, Huazhou Yao2, Shengdong Wang1, Weihong He3, 4*
1. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China.2. Wuhan Center of China Geological survey, Wuhan 430205, China.3. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China.4. Faulty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

The Bancheng Formation exposed along the Shiti Reservoir nearby Bancheng Town, Qinfang Basin, southern Guangxi, is mainly composed of thin-bedded chert. The radiolarian assemblages in the studied section suggest it was a pelagic setting and the age of the Bancheng Formation is Late Carboniferous to Early Permian. The detrital zircon U-Pb ages from the section are characterized by a Permian peak at ~282 Ma. Detrital zircon provenance analysis suggests that the Permian detrital zircons in the Bancheng Formation were likely from volcanic-magmatic arc rocks related to the subduction of the Paleo-Tethyan Ocean. The long-lived deposition (from Upper Devonian to Middle Permian, about 125 Myrs) of the radiolarian cherts in the Qinfang Basin was comparable with that deposited in Ailaoshan Ocean. The radiolarian assemblages in Qinfang Basin show a Tethyan affinity. Together with the Permian subduction-related arc volcanic rocks and the E-MORB type basalts to the northwest of the study area, our data support the existence of a Permian arc-related basin in the Qinfang area.

 

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Keywords:Qinfang Basin, Bancheng Formation, detrital zircon, Radiolarian, Permian arc-related basin.

DOI:
10.1007/s12583-017-0938-y
CLC number:
U469.72
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