Lower Triassic Smithian-Spathian Boundary at West Pingdingshan Section in Chaohu,Anhui Province  

作　　者：LIANG Dan TONG JinNan ZHAO LaiShi 

机构地区：[1]Key Laboratory of Biogeology and Environmental Geology of the Ministry of Education (China University of Geosciences), Wuhan 430074, China [2]State Key Laboratory of Geological Processes and Mineral Resources (China University of Geosciences), Wuhan 430074, China

出　　处：《Science China Earth Sciences》2011年第3期372-379,共8页中国科学（地球科学英文版）

基　　金：supported by Ministry of Science and Technology (Grant No. 2006FY120300-11);National Natural Science Foundation of China (Grant Nos. 40830212, 40921062, 40972003)

摘　　要：The West Pingdingshan Section in Chaohu, Anhui Province, has been extensively studied in recent years and become one of the classic Lower Triassic sequences well-clarified in multiple stratigraphies. Also it is an important section that defines the Smithian-Spathian (S-S) boundary within the Olenekian Stage. The S-S boundary strata at the section are restudied in high-resolution conodont biostratigraphy and carbon isotopes. The refined S-S boundary defined by the FAD of conodont Neospathodus pingdingshanensis is at 30 cm above the base of Bed 52, corresponding to a rapid diversification of conodonts. A sharp positive shift of δ13Ccarb curve co-occurs at the S-S boundary and it can be used as a key reference to define the boundary. The defined S-S boundary position and carbon isotopes curve can be well correlated globally.The West Pingdingshan Section in Chaohu, Anhui Province, has been extensively studied in recent years and become one of the classic Lower Triassic sequences well-clarified in multiple stratigraphies. Also it is an important section that defines the Smithian-Spathian （S-S） boundary within the Olenekian Stage. The S-S boundary strata at the section are restudied in high-resolution conodont biostratigraphy and carbon isotopes. The refined S-S boundary defined by the FAD of conodont Neospathodus pingdingshanensis is at 30 cm above the base of Bed 52, corresponding to a rapid diversification of conodonts. A sharp positive shift of δ13Ccarb curve co-occurs at the S-S boundary and it can be used as a key reference to define the boundary. The defined S-S boundary position and carbon isotopes curve can be well correlated globally.

关 键 词：Early Triassic Smithian-Spathian boundary CONODONT carbon isotopes CHAOHU Anhui 

分 类 号：P631.2[天文地球—地质矿产勘探] P534.51[天文地球—地质学]