| 青藏高原中段古近纪早期古构造演化 |
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| 关键词:thrust system Gangdese island-arc magma Paleocene-Eocene Paleo-tectonics the Tibetan Plateau |
| 基金项目:科技部国际科技合作重点项目(编号: 2006DFB211330)及地质调查项目(编号: 1212010711510) |
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| 摘要: |
| Paleocene-Eocene Tectonic Evolution in Central Tibetan Plateau |
| Large-scale thrust systems formed in Paleocene-Eocene in central Tibetan Plateau, e.g. Gangdese Thrust System (GTS), West Namco Thrust (WNT), Lunpola Thrust System (LTS), North Tanggula Thrust (NTS) and South Kunlun sinistral-slip thrust faults (SKF), and major thrust systems evidently controlled formation and evolution of Paleocene-Eocene basins. Regional magmatic plutonism and volcanic eruptions occurred in Gangdese areas in Paleocene-Early Eocene, and Sr/Y-Y geochemistry indicates that these magmatic rocks belong to island-arc magma caused by subduction of remained oceanic plate. Paleocene-Early Eocene subduction of remained oceanic plate transferred to subduction of India continental plate in 46-45 Ma. Subduction of remained oceanic plate lead to regional thrusting in Paleocene-Early Eocene, and subduction of India continental plate caused more intense thrusting and crust shortening and formed many new thrust systems as Main Central Thrust (MCT), South Damxiong Thrust (SDT), Fenghuoshan thrust system and South Kunlun Thrust (SKT) since Late Eocene |
| WU Zhen-han,HU Dao-gong,YE Pei-sheng,WU Zhong-hai,ZHANG Yao-ling.2009.Paleocene-Eocene Tectonic Evolution in Central Tibetan Plateau[J].Acta Geoscientica Sinica,30(6):749-760. |
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