Discovery of Early Triassic conodonts in western Gangdisê and the establishment of the Tangnale Formation  

作　　者：ZHENG YouYe1, XU RongKe1,2, WANG ChengYuan3, MA GuoTao1, LAI XuLong1, YE DeJin2, CAO Liang1 & LIANG JiWei4 1 Faculty of Earth Resourse, China University of Geoscience, Wuhan 430074, China 2 Research Institute of Geological Survey of Gansu Province, Lanzhou 730050, China 3 Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 4 Department of Geology, Northwest University, Xi’an 710069, China 

出　　处：《Science China Earth Sciences》2007年第12期1767-1772,共6页中国科学（地球科学英文版）

基　　金：Supported by the Chinese National Basic Research Project (973) (Grant No. 2002CB412610);the National Natural Science Foundation of China (Grant Nos. 40542008 and 40672012);the Chinese Geological Survey Project (Grant No. 200213000009);the Chinese Key Basic Pre-researched Project (973) (Grant No. 2005CCA05600)

摘　　要：Most geologists believe that there are no Early and Middle Triassic strata in the W. Gandisê stratigraphic subregion, but the present authors have found Early Triassic conodonts for the first time in the Shiquanhe area, including five conodonts genera (Form genera): Pachycladina, Neohindeodella, Cornudina, Hadrodontina and Hibbardella sp. etc. Then we affirm that Early Triassic deposits exist in the Gandisê stratigraphic subregion, and establish the Tangnale Formation. The conclusion is new important complementary basal data for Triassic stratigraphy division of Gangdisê, reconstructing palaogeography and studying Gangdisê from Paleozoic to Mesozoic island-arc evolution and transi-tion.Most geologists believe that there are no Early and Middle Triassic strata in the W. Gandisê stratigraphic subregion, but the present authors have found Early Triassic conodonts for the first time in the Shiquanhe area, including five conodonts genera (Form genera): Pachycladina, Neohindeodella, Cornudina, Hadrodontina and Hibbardella sp. etc. Then we affirm that Early Triassic deposits exist in the Gandisê stratigraphic subregion, and establish the Tangnale Formation. The conclusion is new important complementary basal data for Triassic stratigraphy division of Gangdisê, reconstructing palaogeography and studying Gangdisê from Paleozoic to Mesozoic island-arc evolution and transi-tion.

关 键 词：Conodonts  EARLY Triassic  WESTERN Gangdisê 

分 类 号：P534.51[天文地球—古生物学与地层学]