藏南白垩纪—古近纪岩石地层厘定与构造地层划分  

The redefinition of Cretaceous-Paleogene lithostratigraphic units and tectonostratigraphic division in southern Tibet

作　　者：胡修棉[1] 李娟[1,2] 安慰[1,3] 王建刚[1,4] 

机构地区：[1]南京大学地球科学与工程学院,江苏南京210023 [2]广西大学海洋学院,广西南宁530004 [3]合肥工业大学资源与环境工程学院,安徽合肥230009 [4]中国科学院地质与地球物理研究所,北京100029

出　　处：《地学前缘》2017年第1期174-194,共21页Earth Science Frontiers

基　　金：国家重点基础研究发展计划"973"项目(2012CB822001);国家杰出青年科学基金项目(41525007)

摘　　要：岩石地层的厘定是一件基础而重要的工作,集中体现了一个阶段对地层的综合认识水平;对一个地区而言,建立行之有效的岩石地层划分方案具有重要的意义。文中详细介绍和评述了藏南白垩纪—古近纪(含中新世)33个岩石地层单元,其中特提斯喜马拉雅南带13个、特提斯喜马拉雅北带9个、日喀则弧前盆地带9个、雅鲁藏布缝合带2个。特提斯喜马拉雅南带白垩系包括古错村组、东山组、察且拉组、冷青热组、波林夏拉组、岗巴村口组、旧堡组、遮普惹山坡组、宗山组;古近系包括基堵拉组、宗浦组、恩巴组、扎果组;特提斯喜马拉雅北带白垩系包括维美组、日朗组、甲不拉组、床得组;古近系包括宗卓组、甲查拉组、蹬岗组、桑单林组、者雅组;日喀则弧前盆地带白垩系包括桑祖岗组、昂仁组、帕达那组、曲贝亚组,古近系包括曲下组、加拉孜组、达金组;中新统包括秋乌组、大竹卡组;雅鲁藏布缝合带包括白垩系冲堆组、渐新统—中新统柳区群。文中在结合物源分析、盆地演化等研究资料基础上,划分了7个构造地层单元:其中印度-亚洲大陆碰撞后的新生代2个(TS1、TS2)、碰撞前白垩纪印度北缘3个(TSI3、TSI4、TSI5)、亚洲南缘2个(TSL3、TSL4)。Lithostratigraphic redefinition is a fundamental and important work,and reflects present knowledge to understanding the strata in a given region.This paper presents detailed description and critical review of thirty-three lithostratigraphic units in southern Tibet including thirteen lithostratigraphic units of southern Tethyan Himalaya which are Gucuocun Formation,Dongshan Formation,Chaqiela Formation,Lengqingre Formation,Bolinxiala Formation,Gambacunkou Formation,Jiubao Formation,Zhepure Shanpo Formation and Zongshan Formation of Cretaceous,Jidula Formation,Zongpu Formation,Enba Formation and Zhaguo Formation of Paleogene;nine lithostratigraphic units of northern Tethyan Himalaya which are Weimei Formation,Rilang Formation,Jiabula Formation and Chuangde Formation of Cretaceous, Zongzhuo Formation,Jiachala Formation, Denggang Formation,Sangdanlin Formation and Zheya Formation of Paleogene;nine lithostratigraphic units of Xigaze forearc basin which include Sangzugang Formation,Ngamring Formation,Padana Formation and Qubeiya Formation of Cretaceous,Quxia Formation,Jialazi Formation,Dajin Formation,Qiuwu Formation and Dazhuka Formation of Paleogene;and two from the IndusYarlung suture zone which are Cretaceous Chongdui Formation and Oligeocene-Miocene Liuqu group.Based on obtained stratigraphic,sedimentological,provenance and basin evolution data,this paper divides seven tectonostratigraphic units in southern Tibet including two Cenozoic tectonostratigraphic units（TS1,TS2）after India-Asia initial collision,five Cretaceous tectonostratigraphic units prior to the India-Asia collision including the TSI3,TSI4,TSI5 units belong to the northern margin of India and the TSL3,TSL4 units belong to southern margin of Asia.

关 键 词：西藏南部 喜马拉雅 岩石地层 构造地层 白垩纪 古近纪 雅鲁藏布缝合带 印度-亚洲大陆碰撞 

分 类 号：P534.53[天文地球—古生物学与地层学] P534.61[天文地球—地质学]