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SHRIMP zircon U-Pb ages from coal beds across the Permian-Triassic boundary, eastern Yunnan, southwestern China

Journal of Palaeogeography 2018年第2期7卷 117-129页

作者： Juan Wang Long-Yi Shao Hao Wang Baruch Spiro David Large State Key Laboratory of Coal Resources and Safety Mining College of Geoscience and Surveying Engineering China University of Mining and Technology (Beijing) School of Resources and Environment Henan Polytechnic University Department of Mineralogy The Natural History MuseumLondon Faculty of Engineering University of Nottingham

The first SHRIMP zircon U e Pb ages from coal beds close to the end-Permian mass extinction are reported from the Ccoal seam in the Yantang Mine in Laibin Town, Xuanwei County, eastern Yunnan *** were extracted from kaolinite claystone layers, defined as tonsteins(volcanic ash deposits), in the subseam Band Bof the coal seam *** U-Pb ages are 252.0 ± 2.3 Ma and 250.3 ± 2.1 Ma for the sub-seam Band B, respectively. Within analytical uncertainties, these U-Pb ages include the time period of the onset of the mass extinction at 251.941 ± 0.037 Ma, which was obtained from the marine Meishan section in Zhejiang Province, ~1600 km away from the Yantang Mine. These new ages represent not only the first and closest ages to the ptb mass extinction in terrestrial coal beds, but also ages from the nearest site to the Emeishan volcanoes investigated so far. Therefore these new data provide the most accurate stratigraphic horizon of terrestrial facies of the end-Permian extinction in South China. The Emeishan volcanoes were likely the source of volcanic ash in the coal seams at the Xuanwei County and broader areas in South China. Furthermore, the minerals and geochemistry characteristics of the Ccoal seam also implied the influences of contemporaneous volcanic activities.

关键词： ptb mass extinction C1 coal seam SHRIMP U-Pb isotope age Xuanwei County Yunnan Province

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