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首页> 外文期刊>Geological Society of America Bulletin >Passive crustal clockwise rotational deformation of the Sichuan Basin since the Miocene and its relationship with the tectonic evolution of the fault systems on the eastern edge of the Tibetan Plateau
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Passive crustal clockwise rotational deformation of the Sichuan Basin since the Miocene and its relationship with the tectonic evolution of the fault systems on the eastern edge of the Tibetan Plateau

机译：四川盆地以来的被动地壳顺时针变形及其与藏高原东边缘故障系统的构造演化的关系

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摘要

We conducted a paleomagnetic study of the Upper and Lower Cretaceous red-beds in the Yibin area, in the southern part of the Sichuan Basin. High-temperature magnetic components were isolated between 580 degrees C and 695 degrees C. An ambiguous fold test resulted in alternative interpretations of the Cretaceous primary magnetization or Oligocene-Miocene remagnetization. Nevertheless, the two different interpretations of the paleomagnetic data consistently show that the Yibin area on the southern edge of the Sichuan Basin experienced clockwise rotation, relative to the eastern edge of the South China Block and Europe. A comparison with the Cretaceous and Paleogene paleomagnetic data from the northern and western part of the Sichuan Basin indicates that, except for the southeastern corner of the Sichuan Basin, the crust of the Sichuan Basin generally experienced significant clockwise rotational deformation since the early Miocene. The northeastward escape of the Songpan-Ganzi Terrane and the counterclockwise rotation of the Yangtze Fold Belt applied a right-lateral shear stress to the region surrounding the Sichuan Basin since the Miocene, which induced the passive crustal clockwise rotational deformation of the Sichuan Basin. Subsequently, the non-synchronous crustal rotational deformation of the Sichuan Basin and its surrounding blocks controlled the tectonic evolution of their boundary tectonic belts: for example, the right-lateral strike-slip movement of the Longmenshan fault belt and the southeastward extension of the Xianshuihe strike-slip fault since the Miocene.
机译：在四川盆地的南部，我们对宜宾地区的上层和下白垩纪红床进行了古磁性研究。分离出高温磁性组分在580℃和695℃之间。模糊折叠试验导致白垩纪初级磁化或寡烯 - 中烯remagnetization的替代解释。然而，对古磁性数据的两种不同的解释始终表明，四川盆地南部边缘的宜宾地区经历了顺时针旋转，相对于华南地区和欧洲的东部。与四川盆地北部和西部的白垩纪和古古古磁性数据相比表明，除了四川盆地的东南角外，四川盆地的外壳通常经历了显着的顺时针旋转变形，自早期的内科。松潘 - 甘孜地铁的东北逃逸和长江折叠带的逆时针旋转施加了右侧剪切应力，以自中小肾上腺素围绕四川盆地，这引起了四川盆地的被动地壳顺时针旋转变形。随后，四川盆地的非同步地壳旋转变形及其周围块控制了边界构造皮带的构造演化：例如，龙门汉断层带的右侧滑动运动和仙水的东南延伸自新世以来的防滑断层。

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    Tong Yabo; Sun Yujun; Wu Zhonghai; Mao Changping; Pei Junling; Yang Zhenyu; Pu Zongwen; Zhao Yue; Xu Hao;

  • 作者单位

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Hohai Univ Sch Earth Sci &

    Engn Nanjing 210098 Jiangsu Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Capital Normal Univ Coll Resources Environm &

    Tourism Beijing 100048 Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

    Chinese Acad Geol Sci Inst Geomech Beijing 100081 Peoples R China;

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  • 正文语种 eng
  • 中图分类 地质学;
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