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Guadalupian (Middle Permian) Radiolarian and Sponge Spicule Faunas from the bancheng formation of the Qinzhou Allochthon,South China

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Journal of Earth Science 2013年第2期24卷 145-156页

作者： Ito Tsuyoshi 张磊冯庆来 Matsuoka Atsushi State Key Laboratory for Geological Processes and Mineral Resources China University of Geosciences Graduate School of Science and Technology Niigata University Department of Geology Faculty of ScienceNiigata University

The Gujingling （古井岭） Section in Xiaodong （小董）, Guangxi （广西） Zhuang Autonomous Region, China, consists of cherts and siliceous siltstones, which belongs to the bancheng （板城）formation of the Qinzhou （钦州） allochthon. Three successive radiolarian assemblage-zones related to the Guadalupian （Middle Permian） appear in the section in the following ascending order： Pseudoalbaillella sp. aff. Pseudoaibailleila longicornis-Pseudoalbaillella fusiformis, Follicucuilus monacanthus, and Follicucuilus scholasticus-Foilicucullus porrectus. The radiolarian content in this section is generally greater than that of sponge spicules. The radiolarian fauna commonly consists of abundant Albaillellaria and spherical radiolaria with minor Latentifistularia and Entactinaria. The sponge fauna is composed mainly of hexactinellids with minor demosponges. These siliceous fossil faunal features, comparable with those in a deep basin of the western belt of the Phosphoria Basin in the western United States, indicate that the bancheng formation in the Gujingling Section was deposited in a basin deeper than 1 000 m. The siliceous siltstones in the section are characterized by inclusion of silt-sized quartz and no inclusion of sand-sized materials, suggesting that the Gujingling Section was located at least a few hundred kilometers from the South China Block in the Guadalupian.

关键词： radiolarian fossil sponge spicule Guadalupian (Middle Permian) bancheng formation Qinzhou allochthon paleobathymerry.

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Radiolarian and Detrital Zircon in the Upper Carboniferous to Permian bancheng formation,Qinfang Basin,and the Geological Significance

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Journal of Earth Science 2018年第3期29卷 594-606页

作者： Xue Ke Zongyan Zhang Jianghai Yang Huazhou Yao Likuan Zhu Weihong He Institute of Geological Survey China University of GeosciencesWuhan 430074China Wuhan Center of China Geological Survey Wuhan 430205China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China School of Earth Sciences China University of GeosciencesWuhan 430074China Zhengzhou Institute of Multipurpose Utilization of Mineral Resources Chinese Academy of Geological SciencesZhengzhou 450006China

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.

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