| 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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| 关键词:paleomagnetism Central Asian Ocean North China Siberia UHPM |
| 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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| 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 |
| 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. |
| LI Peng-wu,GAO Rui,GUAN Hua,LI Qiu-sheng.2007.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[J].Acta Geoscientica Sinica,28(3):234-252. |
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