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Protoconodont fossils for refining the Cambrian bottom and the contribution to shale gas formation along the southwest margin of yangtze block

引用

China Geology 2020年第4期3卷 558-566页

作者： Jun-ping Liu Si-cun Song Wei Wang Feng Tang Jing Li Xiang-dong Duan Xiao-hu Wang Bai-dong Sun Sai-ying Yu Shao-bin Hu Wen-ting Duan Yunnan Institute of Geological Survey Kunming 650216China Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization Ministry of Natural ResourcesKunming 650051China Department of Earth Sciences University College LondonLondon WC1E6BTUnited Kingdom Key Laboratory of Stratigraphy and Palaeontology Chinese Academy of Geological SciencesMinistry of Natural ResourcesBeijing 100037China Yunnan Institute of Land and Resources Planning and Design Kunming 650216China Yunnan Department of Natural Resources Kunming 65000China

It has been an intense debate on the exact boundary between Ediacaran and Cambrian in the southwest yangtze *** calibration of this critical boundary has a remarkable influence on the further investigation of the break-up of the Rodinia Supercontinent,the early life evolution,and the mechanism of the phosphorite *** and Cambrian strata and fossils are widely distributed in Anning,Yunnan Province in *** recent years,the Xiaowaitoushan Member from the Lower Yuhucun Formation has been *** this interval with continuous collections,the first appearance datums(FADs)of the protoconodont(Fomitchella *** Yang et He,Protohertzina *** Missarzhevsky)and globular embryos fossil(Olivooides sp.)earlier than these in the Lower Cambrian strata of the Meishucun Formation were *** discovery indicates that the Xiaowaitoushan Member has included more FADs than the previously discovered single FAD of Anabarites primitivus Qian et Jiang,and the Ediacaran–Cambrian boundary in southwest China should be replaced below the Point“A”of the Meishucun Formation in Yunnan *** Point“B”of the Meishucun Formation is younger than the suggested age 541 Ma of the Ediacaran–Cambrian boundary and can no longer reference the Global Boundary Stratotype Section and Point(GSSP)correlation in southwest *** can be suggested based on the previous stratigraphy and palaeontology studies from northern Sichuan and southern Shaanxi and the FAD of the globular embryos fossils that the Ediacaran‒Cambrian boundary in the southwest yangtze block should be placed at the base of the Xiaowaitoushan Member;other phosphorite strata refer to Xiaowaitoushan *** discovery of the FADs of the shelly fossils in the Xiaowaitoushan Member provides new evidence for the global correlation of the Ediacaran–Cambrian boundary in the southwest yangtze *** conodont discoloration index(CAI)of the specimens in Anning is between 2 and 3,which indicates

关键词： Shale gas Ediacaran-Cambrian boundary Protoconodont Embryos fossil Xiaowaitoushan Member southwest yangtze block Geological survey engineering Yunnan Province China

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