| 青藏高原东南缘构造旋转的古地磁学证据 |
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| 引用本文： | 李仕虎,黄宝春,朱日祥.青藏高原东南缘构造旋转的古地磁学证据[J].地球物理学报,2012,55(1):76-94. |
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| 作者姓名： | 李仕虎 黄宝春 朱日祥 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029;
2. 中国科学院研究生院, 北京 100049 |
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| 摘 要： | 本文在总结青藏高原东南缘近年来地质研究进展的基础上,从古地磁学的角度讨论其新生代以来的构造运动特征.结果表明:相对稳定的欧亚大陆,新生代以来山泰地块发生了约20°～80°顺时针旋转,局部地区旋转量甚至高达135°,且中部地区的旋转量明显高于南北地区；印支地块经历了～30°的顺时针旋转；川滇地块的顺时针旋转量沿102°E...
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| 关 键 词： | 青藏高原东南缘 古地磁 构造旋转 走滑逃逸 |
| 收稿时间： | 2011-04-06 |
Paleomagnetic constraints on the tectonic rotation of the southeastern margin of the Tibetan Plateau |
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| LI Shi-Hu
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HUANG Bao-Chun
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ZHU Ri-Xiang.Paleomagnetic constraints on the tectonic rotation of the southeastern margin of the Tibetan Plateau[J].Chinese Journal of Geophysics,2012,55(1):76-94. |
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| Authors: | LI Shi-Hu HUANG Bao-Chun ZHU Ri-Xiang |
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| Institution: | 1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics of the Chinese Academy of Sciences, Beijing 100029, China;
2. Graduate University of the Chinese Academy of Science, Beijing 100049, China |
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| Abstract: | In this paper we present a comprehensive summary of the geological evolution of the southeastern margin of the Tibetan Plateau and a detailed reanalysis of previously published paleomagnetic data.We focus on the Cenozoic,which represents a period during which the southeastern margin of the Tibetan Plateau was one of the most active tectonic regions due to the India-Eurasia collision.Our analysis indicates that,since the Cenozoic,with respect to the stable Eurasian block,the Shantai terrane experienced a clockwise rotation of ~20°—80°,with some areas experiencing clockwise rotation by as much as 135°,and the rotation of the central part of the terrane is higher than that in the north and south of the terrane;the IndoChina terrane rotated ~30° clockwise and the rotation of the Chuandian terrane decreased from 30° along the longitude 102°E from south to north.Of the three terranes only the Shantai terrane recorded a ～8° southward translation.The variation of rotation versus time indicates that the main rotation of the southeastern margin of the Tibetan Plateau occurred between Eocene and mid-Miocene,which is in accordance with the sinisterly slip of the Ailao Shan-Red River fault zone.This complex tectonic history,revealed by paleomagnetism,cannot be fully explained by the commonly accepted models for the formation of the Tibetan Plateau,such as crustal thickening,lateral extrusion or lower crustal flow.Reliable Cenozoic paleomagnetic data in the southeast margin of Tibetan Plateau are scarce.Therefore,to better evaluate the effects of the India-Eurasian collision on the southeastern margin of the Tibetan Plateau,additional and more detailed paleomagnetic studies of Cenozoic rocks from this region are essential. |
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| Keywords: | Southeastern margin of the Tibetan Plateau Paleomagnetism Tectonic rotation Extrusion |
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