西藏札达盆地形成演化与喜马拉雅山隆升  

The Formation and Evolution of Zhada Basin in Tibet and the Uplift of the Himalayas

作　　者：朱大岗[1] 孟宪刚[1] 邵兆刚[1] 杨朝斌[2] 韩建恩[1] 余佳[1] 孟庆伟[1] 吕荣平[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]西藏自治区国土资源厅,拉萨850000

出　　处：《地球学报》2006年第3期193-200,共8页Acta Geoscientica Sinica

基　　金：国家自然科学基金项目(编号:40572134);中国地质调查局项目"青藏高原第三纪重点古湖泊环境演变序列"(任务书编号:科[2005]005-02;工作项目编码:1212010511902)资助。

摘　　要：通过野外地质调查、实测地层剖面和室内综合研究,笔者将札达盆地上新世-早更新世形成演化划分为6个阶段:①盆地初始断陷阶段;②盆地加速断陷阶段;③盆地强烈断陷阶段;④盆地断陷止息阶段;⑤盆地二次初始断陷阶段;⑥盆地二次加速断陷阶段.并以札达盆地形成演化为基础将喜马拉雅山此阶段的隆升划分为5个阶段:①慢速隆升阶段(5.4～4.4Ma);②中速隆升阶段(4.4～3.5 Ma);③快速隆升阶段(3.5～3.2Ma);④停止隆升阶段(3.2～2.7 Ma);⑤快速隆升阶段(2.7Ma).研究表明,喜马拉雅山的隆升是一个多阶段、不等速和非均变的复杂过程.According to field geological investigation, stratigraphic section survey and indoor integrated studies, the authors have divided the evolution of Zhada basin during Pliocene_Early Pleistocene into six stages, namely, ① the initial fault depression, ② the accelerated fault depression, ③ the intense fault depression, ④ the stop of fault depression, ⑤ the second initial fault depression and ⑥ the second accelerated fault depression. On the basis of the shaping and evolution of Zhada basin, the uplift of the Himalayas has been divided into five stages, i.e., ① the slow uplift stage (5.4～4.4 Ma), ② the intermediate_speed uplift stage (4.4～3.5 Ma), ③ the high_speed uplift stage (3.5～3.2 Ma), ④ the stop of the uplift (3.2～2.7 Ma) and ⑤ the fast uplift stage (2.7 Ma). It is obviously shown that the uplift of the Himalayas is a complex process characterized by poly_stages, nonuniform velocity and nonuniformity.

关 键 词：西藏札达 上新世-早更新世 盆地演化 山脉隆升 喜马拉雅山 

分 类 号：P5[天文地球—地质学]