西藏久朗仓地区吐卡日组化石的发现及其意义  

Discovery and signification of fossils of Tukari Formationin Jiulangcang area of Tibet

作　　者：侯召硕[1] 刘振宇[1] 孙继彬[1] 王永胜[1] 郭安臣[1] 李东泽 纪占胜[2] HOU Zhao-shuo;LIU Zhen-yu;SUN Ji-bin;WANG Yong-sheng;GUO An-chen;LI Dong-ze;JI Zhan-sheng(Institute of Geological Survey of Jilin Province,Changchun 130102,Jilin,China;Key Laboratory of Stratigraphy and Pa-laeontology of Ministry of Natural Resources,Chinese Academy of Geological Science,Bejing 100037,China)

机构地区：[1]吉林省地质调查院,吉林长春130102 [2]自然资源部地层与古生物重点实验室,中国地质科学院地质研究所,北京100037

出　　处：《吉林地质》2020年第2期1-9,共9页Jilin Geology

摘　　要：西藏班戈县久朗仓地区新发现中生代珊瑚化石23个属种和层孔虫化石5个属。这些化石表明其所在地层的时代为晚侏罗世,因此不属于中泥盆统—下石炭统查果罗玛组和中二叠统下拉组。根据沉积特征与古生物特点,本次主要研究的地层应对比至侏罗系上统吐卡日组,岩性主要以碳酸盐岩为主,其上段夹碎屑岩,表明本套地层处于稳定的浅海碳酸盐台地环境,其中生物礁的发现表明吐卡日组也是措勤盆地一个有利的油气勘探目标。About 23 genera and species of coral fossils,5 genera of stromatoporoid fossils are recognized in Jiulangcang area,Bange County,Tibet. These fossils indicate the age of the related strata to be the Late Jurassic,instead of the Middle Devonian Lower Carboniferous chaguoluoma Formation and Middle Permian Xiala Formation. According to the Characteristics of fossils and sedimentary,the strata belongs to the Tukari Formation,which characterized by carbonate rocks and interlayered with clastic rock in the upper section. According to the above studies,it shows that the strata are in a stable shallow sea carbonate platform environment. The discovery of reefs indicates that the Tukari Formation is also a powerful target for oil and gas exploration in the Cuoqin Basin.

关 键 词：西藏 措勤盆地 久朗仓地区 吐卡日组 化石 

分 类 号：P534.52[天文地球—古生物学与地层学]