Jurassic integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas  

作　　者：Jianguo LI Xin RAO Lin MU Xiaohui CUI Xin LI Hui LUO Peixue LIU 

机构地区：[1]Center for Excellence in Life and Paleoenvironment,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China [2]Nanjing College,University of Chinese Academy of Sciences,Nanjing 211135,China

出　　处：《Science China Earth Sciences》2024年第4期1195-1228,共34页中国科学（地球科学英文版）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research(Grant No.2019QZKK0706);the National Natural Science Foundation of China(Grant Nos.42372019,41888101,41872004,42272027,42288201,42172028);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB26000000,XDA2007020203)。

摘　　要：The Qinghai-Tibetan Plateau experienced a unique geological evolution during the Jurassic,driven by the termination of the Palaeotethys and the reduction of the Neotethys.The Indian Plate separated from the northern margin of Gondwana and drifted northward from the Southern Hemisphere.Given that the timing of strata serves as the basis for reconstructing geological history,the present work aimed to develop a new multiple stratigraphic and chronologic framework for the Jurassic strata of the Qinghai-Tibetan Plateau region via a synthesis of the material on lithostratigraphy,palaeontology,iso-radiometric dating,magnetostratigraphy,and other techniques with an emphasis on recent progress and findings.The new framework included the Jurassic System from the four major subdivisions of the plateau:the Baryan Har,Qiangtang,Lhasa-Gandise,and Southern Xizang(Himalaya).Ultimately,a more complete,refined biostratigraphic sequence was proposed,comprising the most common fossils in the plateau and those that are stratigraphically significant for the Jurassic stratigraphy,including ammonites,bivalves,brachiopods,foraminifera,radiolarians,and dinoflagellate cysts for the marine strata,and pollen and spores,and charophytes for the terrestrial sediments.This biostratigraphic framework was correlated with the Jurassic international standard zonation of the Geological Time Scale 2020 via standard or representative species or genera of ammonites.Based on this framework,we constructed a lateral correlation of the Jurassic strata between different basins of the plateau.The palaeontologic correlation in the present work shows that the Lhasa-Gandise Block had a closer relationship with the Qiangtang Block than with the Southern Xizang Himalaya during the Jurassic Period.Meanwhile,the Lhasa-Gandise Block and Qiangtang Block shared similar marine fauna features of the north marginal East Tethys.This contrasts the opinion suggesting that the Yarlung Zangbo Tethys was a small back-arc basin.A combination of stratigraphical,palaeontological,a

关 键 词：BIOSTRATIGRAPHY CHRONOSTRATIGRAPHY Correlation Yarlung Zangbo suture Bangong Co-Nujiang suture TETHYS 

分 类 号：Q911[天文地球—古生物学与地层学] P534.52[生物学—古生物学] P535