西藏措勤盆地下二叠统-下三叠统碳酸盐岩牙形石生物地层划分  

Conodont biostratigraphic division of Lower Permian-Lower Triassic carbonate rocks in Cuoqin Basin,Tibet

作　　者：徐琳[1] 胡林[1] 肖进[1] 李宁[1] 伊海生[2] 赵宇 XU Lin;HU Lin;XIAO Jin;LI Ning;YI Haisheng;ZHAO Yu(Northwest sichuan geological team,Sichuan bureau of exploration and development of geology and mineral resources,Mianyang 621000,Sichuan,China;Institute of sedimentary geology,chengdu university of technology,Chengdu 610059,Sichuan,China;The sixth geological brigade of the bureau of geology and mineral exploration and development of the Tibet autonomous region,Lhasa 851400,Tibet,China)

机构地区：[1]四川省地质矿产勘查开发局川西北地质队,四川绵阳621000 [2]成都理工大学沉积地质研究院,四川成都610059 [3]西藏自治区地质矿产勘查开发局第六地质大队,西藏拉萨851400

出　　处：《中国地质》2021年第6期1781-1789,共9页Geology in China

基　　金：中国地质调查局项目(DD20160160)资助。

摘　　要：措勤盆地下二叠统昂杰组之上广泛发育碳酸盐岩沉积,前人先后对这套碳酸盐岩进行了解体,建立了多个地层单元。本次报道剖面为盆地中的二叠系—三叠系的连续整合沉积剖面,通过牙形石研究在这套碳酸盐岩中识别出了下二叠统—下三叠统的5个牙形石带,即:Mesogondolella siciliensis-Sweetognathodus subsymmetricus带、Mesogondolella idahoensis带、Jingondolella aserrata带、Clarkina meishanensis带、Neospathodus dieneri带,并将下拉组时代修订为下二叠统空谷期—中二叠统末。Carbonate sediment is widely developed above Lower Permain Angjie Formation in Coqin basin,which was disintegrated by previous research to establish several formations.Five conodont zones of Lower Permian-Lower Triassic were identified in the carbonate rocks through conodont studies,namely Mesogondolella siciliensis-Sweetognathodus subsymmetricu zone,Mesogondolella idahoensis zone,Jingondolella aserrata zone,Clarkina meishanensis zone,Neospathodus dieneri zone,and the stratigraphic age of the Xiala Formation was constrained at Lower Permian Kungurian-the later of Middle Permian.

关 键 词：下拉组 桑穷组 文布当桑组 嘎仁错组 牙形石 地质调查工程 措勤盆地 西藏 

分 类 号：P534.46[天文地球—古生物学与地层学] P534.51[天文地球—地质学]