青藏高原形成和演化的古地磁研究进展综述

A Review of Paleomagnetic Study of the Formation and Evolution of the Tibetan Plateau

20世纪80年代以来,特别是最近10年,中外古地磁学者在青藏高原获得了一大批古地磁数据,从构造古地磁角度,重建了青藏高原诸块体(喜马拉雅、拉萨地块、羌塘地块)的碰撞拼合过程,探讨了上述块体碰撞所造成的青藏高原陆内构造缩短量和变形模式。本文对近30年来青藏高原古地磁研究进行了回顾和总结,并在此基础上试图重建了中、新特提斯洋的演化过程,进一步探讨青藏高原形成和演化的动力学背景。

During the past decade,Chinese and foreign geomagnetic scholars obtained a large number of paleomagnetic data on the Tibetan plateau.Based on these paleomagnetic results,the collision process of the Tibetan plateau blocks including the Himalayas,Lhasa and Qiangtang blocks were reconstructed.Both the amount of intracontinental crustal shortening due to the collision of India–Asia and the model of the plateau deformation were discussed.The previous paleomagnetic studies of the Tibetan plateau in the past 30 years are reviewed and summarized in this paper.On the basis of the analysis of the available paleomagnetic data,the authors try to rebuild the evolution process of the Mid-Tethys and Neo-Tethys Ocean,and to further study the dynamic background of the formation and evolution of the Tibetan plateau.