| 华北与西伯利亚地块碰撞时代的古地磁分析——兼论苏鲁-大别超高压变质作用的构造起因 |
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| 引用本文：李朋武,高锐,管烨,李秋生.2007.华北与西伯利亚地块碰撞时代的古地磁分析——兼论苏鲁-大别超高压变质作用的构造起因[J].地球学报,28(3):234-252. |
| DOI：10.3975/cagsb.2007.03.02 |
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| 基金项目:教育部重点实验室开放课题项目(编号:GDL0503); 自然科学基金重点项目“松藩地块北缘岩石圈结构及其与东昆仑—西秦岭造山带关系”(编号:40334035); 中国岩石圈三维结构数据库项目(编号:200010101) |
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| 中文摘要:对华北和西伯利亚地块进行了古纬度和纬度运移量的对比分析,结合古生物地理、同位素年代学等地质数据,确定了两地块的运动特征,相应地,确定了位于两地块间中亚洋盆最终闭合时代,并与苏鲁-大别山地区的超高压变质岩的峰期变质时代进行了对比.结果表明:①西伯利亚地块于晚泥盆世开始快速向北漂移,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已经存在;②早二叠世西伯利亚地块开始快速向南漂移,并于二叠纪末期(～250 Ma)和华北地块发生碰撞;③早二叠世,中亚洋纬度宽度约39°;④苏鲁-大别山地区的超高压变质岩的形成与西伯利亚和华北地块碰撞后的强烈挤压作用密切相关. |
| 中文关键词:古地磁 中亚洋 华北 西伯利亚 超高压变质岩 |
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| Paleomagnetic Constraints on the Collision of Siberian and North China Blocks, with a Discussion on the Tectonic Origin of the Ultrahigh——Pressure Metamorphism in the Sulu-Dabie Region |
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| Abstract:Using available paleomagnetic data, the authors made a comparative analysis of paleolatitudes and latitudinal displacements of the North China and Siberian blocks to determine the collision and amalgamation history of the two blocks in central Asian region and the corresponding final closure time of the Central Asian Ocean located between the two blocks. Some conclusions have been reached: ① the Siberian Block began to drift northwards rapidly in Late Devonian, and the Central Asian Ocean separating the Siberian and North China blocks had opened from Late Devonian to Late Carboniferous; ② the Siberian Block began to drift southwards rapidly in Early Permian, and collided with the North China Block at the end of Permian (ca.250 Ma); ③ the Central Asian Ocean had a width of about 39° in latitude in Early Permian; and ④ the ultrahigh-pressure metamorphism (UHPM) in Sulu-Dabie region must have been closely related to the intense compression after the collision between the Siberian and North China blocks. |
| keywords:paleomagnetism Central Asian Ocean North China Siberia UHPM |
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