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

作　　者：Guichun WU Zhansheng JI Gary GLASH Qinggao ZENG Jianxin YAO 

机构地区：[1]Key Laboratory of Stratigraphy and Palaeontology,Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China [2]SinoProbe Laboratory,Chinese Academy of Geological Sciences,Beijing 100094,China [3]Department of Geology and Environmental Sciences,State University of New York-Fredonia,Fredonia,NY 14063,USA [4]Xizang Autonomous Region Geological and Mineral Exploration and Development Burea,Lhasa 850010,China

出　　处：《Science China Earth Sciences》2024年第4期1152-1194,共43页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.42372043,41972034,42072043)。

摘　　要：Rocks of the Qinghai-Tibetan Plateau(QTP)host abundant Triassic fossils.So far,the well established marine fossil sequences based on ammonoids,conodonts,bivalves,brachiopods,radiolarians,and terrestrial spora-pollen sequence have become standard for biostratigraphic correlation of the QTP.For much of Triassic time,the QTP occupied a marine setting as suggested by the dominance of marine deposits.The main sedimentary types represented in the Triassic successions include littoral to shallow marine clastic rocks,shallow marine carbonate platform carbonates,bathyal to abyssal slope carbonates intercalated with clastic and siliceous deposits,coal-bearing clastic strata contained within paralic facies deposits,and littoral and terrestrial volcaniclastic rocks.These deposits are organized into four stages in ascending order:(1)Early Triassic deposits that record marine transgression,including extensive shallow marine carbonate platform strata.(2)Middle Triassic Ladinian to Late Triassic Carnian deposits,including thin-bedded limestone,fine clastics,and siliceous rocks,that accumulated at greater depths than underlying Early Triassic strata and reflect the peak of the transgression.Magmatic activity appears to have occurred in some areas during this stage.(3)Late Triassic Norian deposits that record the onset of marine regression as suggested by the widespread occurrence of platform carbonates.It is noteworthy that stage 3 deposits of the Qin-Qi-Kun area in the northernmost region of the QPT is dominated by terrestrial strata and displays evidence of local erosion.(4)Late Triassic Rhaetian littoral and shallow marine clastic and coal-bearing deposits that preserve the record of continued marine regression continued.The Indus-Yarlungzangbo Suture Zone(IYSZ)appears to have been the rifting axis during Triassic time as suggested by sedimentary facies trends that reflect deepening to south and north.Thus,the Himalaya Block to the south of the IYSZ was part of the passive margin of Gondwana whereas the north side of the IYSZ,

关 键 词：Qinghai-Tibetan Plateau TRIASSIC BIOSTRATIGRAPHY LITHOSTRATIGRAPHY PALAEOBIOGEOGRAPHY Sedimentary palaeogeography 

分 类 号：Q911[天文地球—古生物学与地层学] P534.51[生物学—古生物学] P535