| 青藏高原东南缘新生代地壳运动的转换 |
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| 关键词:southeastern edge of the Tibetan Plateau Baoshan Terrane Pliocene paleomagnetism rotational deformation |
| 基金项目:中国地质调查局地质调查项目(编号: DD20160268);中国地质科学院基本科研业务费项目(编号: JYYWF20182102));国家自然科学基金项目(编号: 41572183) |
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| The Cenozoic Multi-stage Transform of Crustal Movement Pattern of the Southeastern Edge of the Tibetan Plateau |
| High-temperature magnetic components were obtained from the Pliocene Yingpan Formation basalt of the Baoshan Terrane at the southeastern edge of the Tibetan Plateau. The tilt-corrected site-mean direction is Ds=166.5o, Is= –19.3o, k=41.9, a95=5.1o, N=22 (sampling sites), and the positive multi-type fold tests provide their primary magnetic origin. The Pliocene paleomagnetic data indicate that the eastern part of the Baoshan Terrane has experienced 14.5o±4.8o of counterclockwise rotational deformation since the Pliocene, relative to East Asia, which is opposite to that of the northern and central part of the Baoshan Terrane. Combined with the Cenozoic paleomagnetic data of the Baoshan Terrane and Tengchong Block and the activity of block boundary faults, the authors hold that, since the collision of the India plate with the Eurasia plate in the Paleocene, the crustal movement pattern of the Tengchong Block and Baoshan Terrane experienced transforms in late Oligocene and early Miocene, and early Pliocene, respectively, which controlled the tectonic evolution of the strike-slip faults surrounding and in the Baoshan Terrane. |
| PEI Jun-ling,TONG Ya-bo,PU Zong-wen,JING Xian-qing,CAI Yu-hang,LI Jian-feng.2019.The Cenozoic Multi-stage Transform of Crustal Movement Pattern of the Southeastern Edge of the Tibetan Plateau[J].Acta Geoscientica Sinica,40(1):106-116. |
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