西藏吉隆地区白垩纪复理石相遗迹化石及其地质意义  

Trace fossils of Cretaceous flysch facies in the Gyirong area,Tibet,and their geological significance

作　　者：孙立新[1] 李金和[2] 张振利[2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]河北省区域地质矿产调查研究所,河北廊坊065000

出　　处：《地质通报》2002年第11期745-748,共4页Geological Bulletin of China

基　　金：中国地质调查局1:25万吉隆县幅;萨嘎县幅;桑桑区幅区域地质调查项目(编号:20001300009181)部分成果。

摘　　要：系统描述了西藏南部吉隆地区白垩纪甲不拉组和宗卓组首次发现的复理石相遗迹化石5属、7种。主要遗迹属有Chondrites,Cosmorhophehelminthoida,Muensteria,Phycosiphon,Phymatoderma。遗迹化石的形态、习性、水深分布等环境成因特征清楚地显示其为深海Nereites遗迹相的典型代表,反映复理石相深水沉积环境特征。This paper systematically describes five genera and seven species of trace fossils of flysch facies found for the first time in the Cretaceous Jiabula Formation and Zongzhuo Formation in the Gyirong area,southern Tibet.The main genera of trace fossils are Chondrites,Cosmorhophe helminthoida,Muensteria,Phycosiphon and Phymatoderma.The forms ,habits and water depth dis tribution of the trace fossils may clearly prove that the trace fossils are typical representatives of the abyssal Nereites ichnofacies,reflecting the features of the flysch facies deep-water sedi mentary environment.

关 键 词：白垩纪 遗迹化石 复理石相 西藏 形态 甲不拉组 宗卓组 深水沉积环境吉隆地区 

分 类 号：Q911.28[天文地球—古生物学与地层学] P534.53[生物学—古生物学]