Collision-Orogeny of the Northern Qinghai-Tibet Plateau and Its Deep Dynamics
青藏高原北部的碰撞造山及深部动力学——中法地学合作研究新进展

The paper reported the main new progresses on the northern Qinghai-Tibet plateau made by the Sino-France team during 1995～2000.They are:①completed total 8 000 km long natural seismic profiles cross the northern boundary and central part of the plateau, identified several deep-cut lithospheric faults and low velocity and low density bodies under the central part of the plateau related to Cenozoic volcanic eruption, the Tarim block subducted beneath the Altun Mts;②found the evidence that the Altyn Tagh fault formed in 220～240 Ma and at least 400 km sinistral offset since, and determined quantitatively deformation in Cenozoic；③discovered 350 km long high-ultrahigh pressure metamorphic belt in the south border of the Qilian terrane,which brobably represented the Early Paleozoic boundary between the North China and Yangtze plates;④according to new discoveries of caledonian ophiolite,granite are subducted complex established paleo-collision orogenic framework of northern Qinghai-Tibet plateau;⑤proposed a new model .“Mantle diapir and inward intracontinental subduction”,to explain the uplift of the Qinghai-Tibet Plateau.