Conodont and Ammonoid Biostratigraphies around the Permian-Triassic Boundary from the Jianzishan of South China  

作　　者：Ruoyu Bai Xu Dai Haijun Song 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China

出　　处：《Journal of Earth Science》2017年第4期595-613,共19页地球科学学刊（英文版）

基　　金：supported by the State Key R&D Project of China(No.2016YFA0601100);the National Natural Science Foundation of China(Nos.41622207,41302271,41530104);the 111 Project(No.B08030)

摘　　要：Conodonts and ammonoids have played significant roles in the Permian-Triassic time- scale. In order to uncover the nature of the Permian-Triassic mass extinction and subsequent recovery, we studied conodont and ammonoid biostratigraphies around the Permian-Triassic boundary from Jianzishan of Hubei, South China. A total of four conodont zones and two ammonoid beds are recog- nized. In ascending order, the conodont zones are Late Changhsingian Clarkina changxingensis Zone, Clarkina yini Zone and Griesbachian Hindeodus parvus Zone, Hindeodus postparvus Zone; the ammon- oid beds are Late Griesbachian Ophiceras beds and Early Dienerian Ussuridiscus varaha beds. At Jian- zishan, Ophiceras beds are stratigraphically younger than Hindeodus parvus Zone, but it is likely to be the same level with Hindeoduspostparvus Zone. The Lower Dienerian in Bed 8 in this section is charac- terized by ammonoid Ussuridiscus varaha beds, which is associated with many Late Grieshachian cono- donts including Hindeodus postparvus, Hindeodus praeparvus, Hindeodus typicalis, Hindeodus pisai, Hindeodus latidentatus, Hindeodus parvus, Hindeodus anterodentatus and Isarcicella turgida, indicating these conodont species could pass through the Griesbachian-Dienerian boundary and occurred in the Early Dienerian oceans.Conodonts and ammonoids have played significant roles in the Permian-Triassic time- scale. In order to uncover the nature of the Permian-Triassic mass extinction and subsequent recovery, we studied conodont and ammonoid biostratigraphies around the Permian-Triassic boundary from Jianzishan of Hubei, South China. A total of four conodont zones and two ammonoid beds are recog- nized. In ascending order, the conodont zones are Late Changhsingian Clarkina changxingensis Zone, Clarkina yini Zone and Griesbachian Hindeodus parvus Zone, Hindeodus postparvus Zone; the ammon- oid beds are Late Griesbachian Ophiceras beds and Early Dienerian Ussuridiscus varaha beds. At Jian- zishan, Ophiceras beds are stratigraphically younger than Hindeodus parvus Zone, but it is likely to be the same level with Hindeoduspostparvus Zone. The Lower Dienerian in Bed 8 in this section is charac- terized by ammonoid Ussuridiscus varaha beds, which is associated with many Late Grieshachian cono- donts including Hindeodus postparvus, Hindeodus praeparvus, Hindeodus typicalis, Hindeodus pisai, Hindeodus latidentatus, Hindeodus parvus, Hindeodus anterodentatus and Isarcicella turgida, indicating these conodont species could pass through the Griesbachian-Dienerian boundary and occurred in the Early Dienerian oceans.

关 键 词：PERMIAN-TRIASSIC CONODONT ammonoid South China stratigraphy. 

分 类 号：P534[天文地球—古生物学与地层学] Q91[天文地球—地质学]