下地壳流变层对青藏高原及其周边大尺度地貌的制约  

Lower Crust Flow and Large-Scale Geomorphy of Qinghai-Tibet Plateau

作　　者：余绍立[1] 季建清[1] 陈建军[1] 张新钰[1] 

机构地区：[1]北京大学地球科学与空间学院,北京100871

出　　处：《地质科技情报》2006年第5期1-7,20,共8页Geological Science and Technology Information

基　　金：国家自然科学基金项目(4000201940472100)

摘　　要：以下地壳流变层的变形为切入点,结合青藏高原的构造演化、区域走滑断裂的发育性质和高原南部地区的地球物理资料,介绍了下地壳流变层物质向东和北东流动的特性,探讨了青藏高原及其周边地区地貌形态形成的深部地质过程和下地壳流变层在这一过程中的制约作用,并对塔里木地块、鄂尔多斯地块、四川地块的旋转和柴达木盆地自新生代以来迅速抬升的现象做出了新的解释。By analyzing the rheological deformation of lower crust , ＂lower crustal flow＂of the layered lithosphere of Qinghai-Tibet Plateau and its surroundings were introduced with the integration of its tectonic evolution, the development of large regional strike-slip fault,and geophysical datas from Southern Tibet. Several models about the rheology of lower crust were discussed. It is reinterpreted that the deep geological process controled the formation process of geomorphy and the constraints added by the ＂crustal flow＂ in this process. Then a series of large basins surrounding the Plateau were taken as the boundry of the rheological deformation, to for the analysis concentrating on the mechanism of the function of rheological lower crust in the formation process of the Plateau and its surroundings. The explaination of the rotation of Tarim, Ordos and Sichuan blocks and the rapid uplift of Qaidam Basin was also reinterpreted.

关 键 词：地壳变形 下地壳 流变 大尺度地貌特征 青藏高原 盆地 

分 类 号：P54[天文地球—构造地质学]