西藏亚东堆纳地区始新世轮藻化石  

THE DISCOVERY OF EOCENE CHAROPHYTES FROM DUINA,YADONG,SOUTHERN TIBET,CHINA

作　　者：张文苑[1] 李国彪[1] 

机构地区：[1]中国地质大学(北京),北京100083

出　　处：《微体古生物学报》2017年第4期360-368,共9页Acta Micropalaeontologica Sinica

基　　金：中国科学院战略性先导科技专项(B类)子课题(XDB050105003);国家自然科学基金项目(41272030;40972026);国家重点基础研究发展计划("973计划";2012CB822001);生物与环境地质国家重点实验室开发性课题(GBL21312)~~

摘　　要：西藏南部地处亚洲板块与印度板块的结合部,在古近纪时曾是新特提斯的残留海盆,因而保存着西藏地区最晚期的海相沉积,本次研究在藏南亚东古鲁浦古近纪地层剖面中首次发现轮藻化石,为探讨新特提斯的消亡过程及印度与亚洲板块陆陆碰撞机制提供了良好的生物地层学资料。鉴定、描述4属4种,其中三新种。该轮藻化石组合总体显示始新世轮藻化石组合的特征,时代应为始新世。轮藻化石在始新世海相地层中的出现,表明该时期研究区处于一种海陆过渡相环境,预示新特提斯残留海盆地的即将消亡。Southern Tibet, China is located between Asian and India Plates and was a residual basin of Neo-Tethys during the Paleogene, where developed a set of the youngest marine sediments. Abundant charophyte fossils were gained from the Zhepure Formation of Gulupu section,Duina,Yadong, southern Tibet,of which 4 species in 4 genera were described in this paper. The charophyte fossil assemblage from the Gulupu section suggests an Eocene age to the Zhepure Formation. The appearance of the Eocene charophyte fossils in the Paleogene marine strata shows that Yadong area should locate in an environment with a water depth less than 30m, which may imply the imminent demise of the Neo-Tethys.

关 键 词：轮藻 始新世 亚东堆纳 新特提斯 西藏 

分 类 号：Q914[天文地球—古生物学与地层学]