| 青藏高原腹地典型盆—山构造形成时代 |
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| 关键词:basin and range tectonics chronological dating ESR dating central Tibetan Plateau, |
| 基金项目:国家重点基础研究发展规划95030106课题，国土资源大调查DKD001003项目，INDEPTHⅢ项目 |
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| 摘要: |
| Dating of Typical Basin and Range Tectonics in Central Tibetan Plateau |
| NE , NW and NS trending basin and range tectonics occurred in central Tibetan Plateau after the plateau surface reached a certain altitude and the regional tectonic setting transferred from north south crust shortening to east west crust extension. To determine age of typical basin and range tectonics and evolutionary time of the central Tibetan plateau, the authors employed thermochronologic method and ESR dating. The rapid uplifting of mountains on both sides and rifting of basins in the middle of the NE trending Yangbajain Danxung basin and range tectonics began in 6.8～8 Ma. The rapid uplifting of granodiorite in the Jiagang Mountains on the southern side of Shenza basin began at about 6.5 Ma, followed by the formation of the NW trending Gelinco Shenza basin and tectonics. The extensional boundary faulting of the northeast trending Shuanghe Heping basin and range tectonics has taken place since 5 Ma. These data reveal an important fact that the change of regional tectonic setting from north south crust shorte ning to east west crust extension in central Tibetan Plateau might have occurred in 5～8 Ma. |
| WU Zhen-han,JIANG Wan,WU Zhong-hai,ZHANG Shu-kun.2002.Dating of Typical Basin and Range Tectonics in Central Tibetan Plateau[J].Acta Geoscientica Sinica,23(4):289-294. |
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