藏北双湖地区上三叠统肖茶卡群的重新厘定及其地质意义  

Redefinition of the Upper Triassic Xiaochaka Group in the Shuanghu area,northern Tibet, China, and its geological implications

作　　者：冯心涛[1] 朱同兴[1] 李才[2] 林仕良[1] 张启跃 张惠华 曾庆荣 李宗亮 

机构地区：[1]中国地质调查局成都地质矿产研究所,四川成都610082 [2]吉林大学地球科学学院,吉林长春130061 [3]云南省地质调查院,云南玉溪653100

出　　处：《地质通报》2005年第12期1135-1140,共6页Geological Bulletin of China

基　　金：中国地质调查局<1:25万江爱达日那幅区域地质调查>项目(编号200313000021);<青藏高原地层格架建立与完善>项目(编号200313000054)成果。

摘　　要：在双湖地区肖茶卡一带上三叠统肖茶卡群中发现2套砾岩,根据岩石组合、生物化石和界面特征,以2套砾岩为标志层,将原肖茶卡群分解为3个组级岩石地层单位,由下至上分别为肖切堡组、角木茶卡组和日干配错组。从岩石地层、生物地层和层序地层方面阐述了3个组级地层单位的特征和划分的意义。During the 1：250000 geological survey of the Jiang＇aidarina Sheet, two suites of conglomerates were discovered in the Upper Triassic Xiaochaka Group in the Xiaochaka area, Shuanghu. According to the rock association, fossils and boundary characteristics and by taking two suites of conglomerates as the marker beds, the original Xiaochaka Group is disintegrated into three formations, which are in ascending order the Xiaoqiebao, Jiaomu Caka and Riganpei Co formations. This paper elucidates the characteristics of the three formations and implications for their establishment with respect to the lithostratigraphy, biostratigraphy and sequence stratigraphy.

关 键 词：肖茶卡群的重新厘定 地质意义 角木茶卡组 西藏双湖地区 

分 类 号：P534.51[天文地球—古生物学与地层学]