西藏羌塘地区肖茶卡群与日干配错群层序及对比——兼论对羌南、羌北分区界线的质疑  

The Xiaochaka Group and Riganpeicuo Group stratigraphic sequence and correlation in the Qiangtang area, Tibet-question the validity of the boundary between Qiangnan and Qiangbei strata

作　　者：张树岐 王洪双 冯德臣 姜雪飞 李学彬 李庆武 

机构地区：[1]吉林地质调查院,吉林长春130061

出　　处：《吉林地质》2005年第2期16-20,共5页Jilin Geology

基　　金：中国地质调查局.1:23万帕度错幅(I45C004003);昂达尔错幅(I45C004004)区域地质调查.项目编号:200313000018.

摘　　要：西藏羌塘南部地区的晚三叠世地层,前人曾划分为羌南——保山地层区多玛分区日干配错群和羌北——昌都—思茅地层区赤布张错分区肖茶卡群。经过笔者研究后,根据宏观岩石组合特征将原日干配错群划分为鲁宗乃组、曲瑞恰乃组、亏莫塔雀组,其中鲁宗乃组为碳酸盐岩组合,曲瑞恰乃组为碎屑岩夹碳酸盐岩组合,亏莫塔雀组为碳酸盐岩夹少量碎屑岩组合,将原肖茶卡群划分为节拉日组、多涌组、扎那组、赛公药组。节拉日组为中基性火山岩组合,多涌组为碳酸盐岩夹碎屑岩组合,扎那组为泥岩、细碎屑岩夹中碎屑岩组合,赛公药组为中碎屑岩夹细碎屑岩组合。多涌组与鲁宗乃组可进行对比,扎那组和赛公药组与曲瑞恰乃组可对比。通过对比,认为区内晚三叠世的沉积环境基本相同,因而认为羌南、羌北的分区界线不在本研究区内。In the study area, the late Trassic strata were divided to Qiangnan--Baoshan strata division, Duoma subdivision, Riganpeicuo Group and Qiangbei-- Changdu--Simao strata division, Chibuzhangcuo subdivision, Xiaochaka Group by the formers. Through the study in the study area, according to the rock association characteristics, the primary Riganpeicuo Group was divided to Luzongnai Formation, Quruiqianai Formation and kuimotaque Formation, the primary Xiaochaka Group was divided to Jielari Formation,Duoyong Formation, Zhana Formation and Saigongyao Formation, among which,Duoyong Formation is contrast with Luzongnai Formation and Zhana Formation and Saigongyao Formation is contrast with Quruiqianai Formation. Through the correlation, it is considered that the late Triassic sedimentary environment is the same on the whole in the study area, therefore, it is considered that there is no boundary between Qiangnan and Qiangbei strata.

关 键 词：羌塘南部 晚三叠世 地层层序 沉积环境 分区界线 

分 类 号：P534.51[天文地球—古生物学与地层学]