Radiolarian and Detrital Zircon in the Upper Carboniferous to Permian Bancheng Formation,Qinfang Basin,and the Geological Significance  

作　　者：Xue Ke Zongyan Zhang Jianghai Yang Huazhou Yao Likuan Zhu Weihong He 

机构地区：[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,China [4]School of Earth Sciences,China University of Geosciences,Wuhan 430074,China [5]Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,Chinese Academy of Geological Sciences,Zhengzhou 450006,China

出　　处：《Journal of Earth Science》2018年第3期594-606,共13页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.41772016);the China Geological Survey(Nos.1212011220529,121201004000150021,and 121201017000172004);the Key Research and Development Project of the Ministry of Science and Technology(No.2016YFC0601005)

摘　　要：The Bancheng Formation exposed along the Shift 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 subducfton of the Paleo-Tethyan Ocean. The long-lived deposition （from Upper Devonian to Middle Permian, about 125 Ma） 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.The Bancheng Formation exposed along the Shift 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 subducfton of the Paleo-Tethyan Ocean. The long-lived deposition （from Upper Devonian to Middle Permian, about 125 Ma） 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.

关 键 词：Qinfang Basin Bancheng Formation detrital zircon RADIOLARIAN Permian arc-related basin. 

分 类 号：P534.4[天文地球—古生物学与地层学] P597[天文地球—地质学]