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《Journal of Stratigraphy》 2017-03
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A ZIRCON U-PB AGE FROM THE PERMIAN-TRIASSIC BOUNDARY CLAY LAYER IN ENSHI OF HUBEI PROVINCE

SHI Xian-bin;DENG Jie;DUAN Xian-feng;LUO Hong;WONG Mao-zhi;Hubei Geological Survey;  
We carried out a regional geological survey focusing on the tuffaceous claystone at the PermianTriassic boundary in the Enshi area of Hubei Province.Here we report a zircon U-Pb age of 251.6±1.2 Ma(weighted mean 206Pb/238 U age)from this boundary clay layer.This represents the age of volcanic eruptions near the Permian-Triassic boundary.Carbonate carbon isotope data show a negative excursion just above the boundary clay layer.This excursion is closely related to the Permian-Triassic extinction event.According to regional correlation,this claystone has a wide distribution in the studied region.However,there are recognizable regional lithostratigraphic variations below the claystone:uppermost Permian carbonate strata thin from west to east in the studied region,whereas carbonaceous siliceous rocks thicken.
【Fund】: 中国地质调查局大调查项目(No.12120113061800);中国地质调查局扬子工程湘西-鄂西成矿带神农架-花垣地区地质矿产调查二级项目(No.DD20160029)
【CateGory Index】: P534;P597.3
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