Due to the Indian-Eurasian continental sustained collision and the closure of the Neo-Tethys in Cenozoic, The northward subduction of the Lhasa block, and the southern Qiangtang terrane （SQT） thrust southward to the above of the Lhasa block. Thus far, however, the questions about the structure composition, the structure style, the formation age and the structure shorten distribution of the thrusts and the fold deformation which is sandwiched between the mega thrusts are still hotly controversy. Basing on the detailed field investigation, we analysised the Geometry, kinematics feature of the Saibu Co-Zaga Zangbo thrust fault（SZT）,the Doma-Qixiang Co thrust fault（DQT）, the Longeni thrust-fold belt（LT）and the Xiaochaka-Shuanghu thrust fault（XST）, establishing the tectonic framework in detail. We hold that the thrust faults are the same period imbricated thrust napped structure which formed since Eocene. By analysising the fold feature in the field, combining with the joint surface and fault surface sliding vector analysis, we identified four Periods tectonic stress field of the SQT: 1）The early N-S trending compressive tectonic stress of the subduction collision stage in Meso-Tethys. 2）The N- trending detaching stress field of the SQT after the form of Bangonghu-Nujiang suture zone. 3）In Cenozoic, the Tibetan Platen entered the stage of intra-continental deformation and the SQT performed a NE-SW trending compressing feature, and then the mega thrust nappe structure of the SQT actived in Late Paleogene, in which a series of north to south exhibition type imbricated thrusts, which thrusted the SQT to the above of the Lhasa, formed. 4）With the continuous uplift of plateau, the north and south rift valley actived in about 14 Ma, and the tectonic stress turned to SE-NW trending detachment in which the Shuanghu-rifts formed.
Li Zhengyou Xue Lingwen Wang Shifeng Wang Gang Peng Chengming Hou Yun Duan Lei . An analysis of structure style of the mega thrust nappe structure and tectonic stress fields characterisitics of the southern Qiangtang Basin，Tibet[J]. Chinese Journal of Geology, 2017, 52(3): 783-800.