西藏羌塘盆地昂达尔错地区中二叠统龙格组的厘定及地质意义  

Determination and Its Geologic Significance of Middle Permian Runge Formation in Angdaer Lake Area,Qiangtao Basin,Tibei

作　　者：曾禹人 黄建国[2,3] 马德胜[1,2] 白培荣 符宏斌 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]贵州省地质调查院,贵州贵阳550005 [3]贵州大学资源与环境工程学院,贵州贵阳550025

出　　处：《贵州地质》2016年第1期58-63,共6页Guizhou Geology

基　　金：青藏地区油气调查评价下属<羌塘盆地重点区块地质-地球物理调查与井位论证>所属<羌塘盆地昂达尔错区块1:5万石油地质调查>;中国地质地调查局12120114062301联合资助

摘　　要：在西藏羌塘盆地昂达尔错地区前人划分的上三叠统角木日茶卡组中发现了二叠纪化石分子Acanthopecten cf.coloradoensis(Newbrry)和Pterinopectinella?sp.,结合岩石组合特征,经过进一步开展生物年代对比及区域地层对比,将该套角木日茶卡组重新厘定为中二叠统龙格组,从而首次将羌塘盆地东南侧出露地层的时代下限由原来的上三叠统修正至中二叠统,增添了新的古生物化石证据。首次明确了中央隆起带东段的南羌塘地区中新生代之下存在晚古生代地层,为今后更深入研究羌塘盆地零星出露的古生代地层及地质演化提供了重要基础资料。Fossils such as Acanthopecten cf. coloradoensis（Newbrry） and Pterinopectinella sp.,which indicate Middle Permian were found in the formerly- regarded have been found in Jiaomurichaka formation,Upper Triassic at Angdaer Lake area,Tibet. The assemblage characteristics of the rock,basic sequence,and fossil comparison show that this set of strata belongs to Middle Permian Runge formation. The determination of this formation to make age limit of strata at southeast of Qiangtang Basin be amended by Upper Triassic to Middle Permian.,and added new fossil data for Paleozoic,Determining the existence of Late Paleozoic formation under Meso- Cenozoic formation in the eastern of central uplift belt of Qiangtang Basin,and provides an important biography for Discussion of the Geological evolution and Paleozoic basement of Qiangtang Basin.

关 键 词：中二叠统 化石 龙格组 昂达尔错地区 羌塘盆地 西藏 

分 类 号：P534.46[天文地球—古生物学与地层学]