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引用本文:和钟铧 杨德明 李 才. 藏北羌塘盆地褶皱形变研究[J]. 中国地质, 2003, 30(4): 357-360.
HE Zhong-hua, YANG De-ming, Li Cai. Folds in the Qiangtang basin, northern Tibet[J]. Geology in China, 2003, 30(4): 357-360(in Chinese with English abstract).
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藏北羌塘盆地褶皱形变研究
和钟铧 杨德明 李 才
吉林大学地球科学学院,吉林 长春 130026
摘要:
提要:羌塘盆地由于受多期构造活动的影响形成多个构造层,不同构造层的变形特征存在明显差异。其中三叠纪构造层多形成一些紧闭倒转的小型背、向斜褶皱,侏罗纪构造层内多发育大型宽缓的背、向斜及复背斜、复向斜,而白垩纪—新近纪构造层多位于向斜核部和背斜翼部,形成宽缓的褶曲。褶皱变形以近东西向为主,从老到新不同构造层形成的褶皱由紧闭到宽缓,存在一定的继承性和递进叠加的特点。褶皱轴迹的空间展布及变形特点表明不同时期板块的拼合挤压是导致盆地变形的主要驱动力,基底断裂及基底凸凹变化对褶皱的展布和变形有一定程度的控制和影响。
关键词:  褶皱变形  成因机制  羌塘盆地  藏北
DOI:
分类号:
基金项目:中国石油天然气总公司“九五”科技工程项目(QZ—97—2014102)资助。
Folds in the Qiangtang basin, northern Tibet
HE Zhong-hua, YANG De-ming, Li Cai
College of Earth Science, Jilin University, Changchun 130026, Jilin, China
Abstract:
Abstract:There are several structural layers in the Qiangtang basin owing to multi-stage tectonic movements, and these structural layers show different features of deformation. Some small and tight overturned folds are developed in the Triassic structural layers, and large broad anticlines and synclines or compound anticlines and synclines occur in the Jurassic structural layers. Compared with the above, Cretaceous-Neogene structural layers mostly occur in synclinal cores or anticlinal limbs, forming very broad folds. Folds are mainly of E-W trend, and from older to younger folds formed by different structural layers change from tight to broad and show the features of continuous and progressive superimposed deformation. All these show that amalgamation and compression of plates during different periods were the main forcing of the deformation. In addition, basal faults and basal uplift-depression controlled and affected the distribution and deformation of the folds to a certain extent.
Key words:  fold feature  genetic mechanism  Qiangtang basin  northern Tibet