北方板块是否俯冲到了青藏高原之下?现有的资料尚难对此作出确切的回答解决问题的关键之一是青藏高原北缘的新生代岩浆起源与作用过程.支持俯冲模型的地球物理论据及岩浆活动证据都还不够充分.然而,许多证据却表明,陆-陆碰撞引起的大型剪切断裂和地壳大规模缩短在青藏高原北缘的岩石圈运动中有重要的作用.青藏高原北缘的慢源岩浆活动局限在大型走滑断裂的交汇部位,岩浆成因可能与走滑作用导致的局部拉张环境有关.走滑断裂导致岩石圈的重力不稳定性和垮塌,深部热物质上升,它们所携带的热量与剪切作用生成的热一起,导致含水地慢发生部分熔融. Whether the northern plate subduction below the Qinghai-Tibet Plateau? It is difficult to answer the exact information available One of the keys to solve the problem is the Cenozoic magmatic origin and process in the northern margin of the Qinghai-Tibet Plateau. Geophysical arguments supporting the subduction model and However, many evidences indicate that large-scale shear faults caused by land-continent collisions and massive crustal crustal shortening play an important role in the lithospheric movement on the northern margin of the Qinghai-Tibet Plateau. The slow-source magmatic activity is confined to the intersection of large-scale strike-slip faults, and the magmatic origin may be related to the local pull-out environment caused by the strike-slip. The strike-slip faults cause the lithospheric gravity instability and collapse, The heat carried together with the heat generated by the shearing action results in a slow partial melting of the water.