| 西藏和云南三江地区特提斯洋盆演化历史的古地磁分析 |
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| 引用本文：李朋武,高锐,崔军文,管烨.2005.西藏和云南三江地区特提斯洋盆演化历史的古地磁分析[J].地球学报,26(5):387-404. |
| DOI：10.3975/cagsb.2005.05.01 |
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| 基金项目:中国岩石圈三维结构数据库项目（编号：200010101）;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） |
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| 中文摘要:通过对华南、思茅、保山、缅泰、印支、羌塘、拉萨和喜马拉雅地块进行了古纬度和纬度运移量的对比分析,以确定西藏和云南西部三江地区主要地块的碰撞拼合历史,以及相应的特提斯洋盆演化时限。结果表明:①分隔保山和思茅地块的古特提斯洋可能于早志留世张开;②保山与思茅地块于晚二叠世碰撞,然后继续和华南地块、缅泰地块一起向北漂移,直到晚三叠世;③古特提斯洋年龄范围在早志留世至晚二叠世之间;④中特提斯洋年龄范围在早二叠世至早白垩世之间,在晚三叠世达到其最大纬度宽度,约42°;⑤雅鲁藏布江缝合带所代表的新特提斯洋于晚三叠世张开。 |
| 中文关键词:古地磁 古特提斯 中特提斯 新特提斯 滇缅泰马（Sibumasu） |
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| Paleomagnetic Results from the Three Rivers Region, SW China: Implications for the Collisional and Accretionary History |
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| Abstract:A comparative analysis of paleolatitudes and latitudinal displacements was undertaken for the South China, Simao, Baoshan, Shan-Thai, Indochina, Qiangtang, Lhasa and Himalayan blocks by using available paleomagnetic data to determine the collisional and amalgamation history of the main blocks in Tibet and the Three Rivers region, western Yunnan, and corresponding age of the Tethys oceans. The results show that ① the Paleo-Tethys separating the Baoshan and South China blocks was likely opened in the Early Silurian; ② the Baoshan block collided with the South China block (SCB) in the Late Permian (～263 Ma) and continued to drift northwards rapidly together with the South China and Shan-Thai blocks until the Late Triassic; ③ the Paleoo-Tethys ranged in age from Early Silurian time to Late Permian time; ④ the Meso-Tethys ranged in age from Early Permian time to Early Cretaceous time, and reached its greatest width of about 42° in latitude in the Late Triassic ; ⑤The Neo-Tethys, separating the Lhasa and Himalayan blocks, opened in the Late Triassic. |
| keywords:Paleomagnetism Paleo-Tethys Meso-Tethys Neo-Tethys Sibumasu |
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