青藏高原新生代南北走向裂谷研究进展

张佳伟, 李汉敖, 张会平, 徐心悦

Research Progress in Cenozoic N-S Striking Rifts in Tibetan Plateau

Jiawei Zhang, Han'ao Li, Huiping Zhang, Xinyue Xu

图6 青藏高原裂谷盆地演化过程（据参考文献[70]修改） （a）裂谷初期为内流半地堑盆地，受犁式高角度正断层控制，向下延伸到近水平的糜棱岩剪切带；（b）随着伸展量增加，构造卸载导致下盘均衡反弹，同时正断层在中上地壳向上挠曲；（c）在伸展量最大的区域的均衡反弹导致裂谷盆地抬升和剥蚀，在盆地内形成分水岭

Fig. 6 Progressive development of rifts in Tibet (modified after reference [70]) (a) The rifts initiate as internal half-graben basins, bounded by a listric high-angle normal fault that soles into a subhorizontal mylonitic shear zone; (b) With increasing extension magnitude, tectonic unloading results in isostatic rebound of the footwall, as well as upwarping of the normal fault in the mid-upper crust; (c) Footwall isostatic rebound in areas of maximum extension results in uplift and incision of the rift basin and development of an intra-basinal drainage divide