晚白垩世后青藏高原和塔里木地块的整体北移

本文根据塔里木地块及其以南的昆仑、羌塘和拉萨地块晚中生代特别是晚白垩世古地磁数据,提出青藏高原自晚白垩世后北向移动两千余公里,主要并不是通过它本身的大规模地壳缩短来完成,而是与塔里木地块一起作大规模整体北移的结果。一种可能的解释是,在欧亚大陆北部稳定区和塔里木地块之间广大的中亚构造带,自晚白垩世后发生了大规模的地壳缩短。

NORTHWARD MIGRATION OF THE QINGHAIXIZANG PLATEAU AND TARIM BLOCK SINCE THE LATE CRETACEOUS

The Late Cretaceous paleomagnetic poles for the Tarim, Kunlun, Qiangtang and Lhasa blocks strongly suggest that the northward movement of over 2000 km of the Qinghai-Xizang Pla- teau since Late Cretaceous was not achieved through internal crystal shortening but was caused by large-scale northward migration of the Qinghai-Xizang Plateau and Tarim block with respective to the stable northern Eurasia. One possible interpretation is that the wide range of central-Asia tectonic belt between the north of the Tarim block and the south of the stable northern Eurasia has experienced a large scale crustal shortening since Late Cretaceous.