Palynological evidence sheds new light on the age of the Liuqu Conglomerates in Tibet and its geological significance  

作　　者：WEI LiJie LIU XiaoHan YAN FuHua MAI XueShun LI GuangWei LIU XiaoBing ZHOU XueJun 

机构地区：[1]Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [3]Institute of Geology, China Earthquake Administration, Beijing 100029, China

出　　处：《Science China Earth Sciences》2011年第6期901-911,共11页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of China (Grant No. 40631004)

摘　　要：The Liuqu Conglomerates consist of a suit of terrestrial molasse deposits formed in a foreland basin of the Himalaya-Tibet orogenic belt before the collision of India and Eurasia.These deposits record considerable geological information regarding the late tectonic evolution of the Neotethyan ocean.The palynological study of interlayers of mudstone and mud-sandstones indicates an Oligocene age.The palynological assemblage consists mainly of deciduous broad-leaved angiosperms,with some coniferous gymnosperms and evergreen broad-leaved angiosperms.The deposits reflect a broad-leaved deciduous forest or mixed with conifer-broad-leaved forest ecotypes,showing a warm-temperate or temperate zone climatic environment.This work provides significant new information about the tectonic evolution,paleogeography,and paleoenvironment of southern Tibet during the Cenozoic.The Liuqu Conglomerates consist of a suit of terrestrial molasse deposits formed in a foreland basin of the Himalaya-Tibet orogenic belt before the collision of India and Eurasia.These deposits record considerable geological information regarding the late tectonic evolution of the Neotethyan ocean.The palynological study of interlayers of mudstone and mud-sandstones indicates an Oligocene age.The palynological assemblage consists mainly of deciduous broad-leaved angiosperms,with some coniferous gymnosperms and evergreen broad-leaved angiosperms.The deposits reflect a broad-leaved deciduous forest or mixed with conifer-broad-leaved forest ecotypes,showing a warm-temperate or temperate zone climatic environment.This work provides significant new information about the tectonic evolution,paleogeography,and paleoenvironment of southern Tibet during the Cenozoic.

关 键 词：Southern Tibet Yalung Zangpo suture zone Liuqu Conglomerates palynological assemblage OLIGOCENE 

分 类 号：P618.510.2[天文地球—矿床学] F275[天文地球—地质学]