Paleomagnetic Constraints on the Tectonic Rotation of the Southeastern Margin of the Tibetan Plateau
详细信息
- 责任者：Li Shihu (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics of the Chinese Academy of Sciences ; Beijing 100029 ; China) ; Huang Baochun
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(1)
- 关键词：旋卷构造 ; vortex structure ; 挤压构造 ; compression tectonics ; 古地磁 ; paleomagnetism ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.76-94
- 图表：5 illus., 2 tables, 148 refs.
- 分类号：0300
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
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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