新疆且末县红沙湖一带三叠系地层划分及特征

Stratigraphic Classification and Correlation of the Triassic System in Qiemo, Xinjiang

在新疆维吾尔自治区且末县西昆仑地区1∶5万区域地质调查工作中,针对工作区中出露地层开展地质剖面测量和区域地质填图,系统收集其岩性岩相、岩石组合、分布特征、接触关系、基本层序等资料,并开展地层划分及对比研究和沉积环境分析工作。通过研究将工作区内三叠系出露地层划分为群鸭湖组(T1-2q)和云雾岭组(T3y),岩性组合主要为砂岩与泥页岩组成的巨厚层复理石建造,间夹有少量条带状灰岩和极薄层硅质岩及透镜状砾岩。并依据其岩性岩相组合特征和接触关系将群鸭湖组至下而上划分为T1-2q1、T1-2q2、T1-2q3三段,将云雾岭组组划分为T3y1和T3y2两岩性段。进一步分析认为群鸭湖组地层为深水环境重力流沉积,云雾岭组地层则为浅海陆棚-半深海相沉积。

The Triassic System in Qiemo,Xinjiang is tremendous flysch formation consisting of sandstone and argillutite with intercalation of a small amount of banded limestone and thin silica rock and lenticular conglomerate.This paper divides the Triassic System in Qiemo,Xinjiang into Qunyahu Formation(T1-2q)and Yunwuling Formation(T3y)based on 1:50 000 regional geological survey in the western Kunlun region.The Qunyahu Formation as deep water gravity flow deposit is divided into 3 Members such as T1-2q1,T1-2q2 and T1-2q3 and the Yunwuling Formation as neritic shelf-semi-deep marine sediments is divided into 2 Members such as T3y1 and T3y2.