内蒙古中部索伦-林西缝合带封闭时代的古地磁分析

索伦-林西缝合带被认为是华北和西伯利亚地块间中亚洋（或古亚洲洋）最后闭合的界线。利用华北和西伯利亚地块的古地磁数据对比分析，结合相关地质资料，对两地块的碰撞拼合历史，以及位于两地块间相应的中亚洋盆最终闭合时代进行了分析。结果表明：(1)分隔华北和西伯利亚地块的中亚洋在晚泥盆世至晚石炭世期间进一步张开，纬度宽度扩大，大约在早二叠世初期，中亚洋达到最大纬度宽度，约39°；(2)早二叠世以后西伯利亚地块开始快速向南漂移，二叠纪末期（～250 Ma）和华北地块发生碰撞,导致索伦-林西缝合带的形成。

Palaeomagnetic Constraints on the Final Closure Time of Solonker-Linxi Suture

The Solonker-Linxi suture marks the final closure of the Central Asian Ocean (also called it Paleo-Asian Ocean), and is a suture boundary between the North China and Siberian blocks. A comparative analysis of paleomagnetic data from the North China and Siberian blocks has been done to determine the collision and amalgamation history of two blocks in the central Asian region, and corresponding time of final closure of the Central Asian Ocean, located between two blocks. The results show that (1) The Central Asian Ocean separating the Siberian and North China blocks was likely opened further from the Late Devonian to the Late Carboniferous. The Central Asian Ocean reached its greatest width of about 39 in latitude in the beginning of Early Permian; (2) The Siberian block began to drift southwards rapidly in the Early Permian, and collided with the North China block at the end-Permian (~250Ma), leading to the formation of the Solonker-Linxi suture.