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首页> 外文期刊>Journal of the Geological Society of India >Late cretaceous tectonic change of the eastern margin of the Tibetan Plateau — results from multisystem thermochronology
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Late cretaceous tectonic change of the eastern margin of the Tibetan Plateau — results from multisystem thermochronology

机译：青藏高原东缘的白垩纪晚期构造变化-来自多系统热年代学的结果

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摘要

Partially due to lack of structural and sedimentary records to constrain the Jurassic-to-Cretaceous evolution, there was a missing process here in the eastern margin of Tibetan Plateau as it changed from the Paleo-Tethyan to Neo-Tethyan regime. Based on the analysis of 125 thermochronology ages (U/Pb, 40Ar/39A, 87Rb/86Sr, FT, U-Th/He) of igneous rocks from the eastern margin of Tibet, we propose a multisystem thermochronology approach to restore the cooling and emplacement of granites and decipher the missing process. Our integrated study suggests that a key Late Cretaceous (about 100Ma) tectonic change from the Paleo-Tethyan to Neo-Tethyan regime took place there. In the Late Triassic period, the initial emplacement of granite in the Songpan-Ganzi Fold Belt (SGFB) was characterized by a decrease in emplacement age and depth from west to east, and from north to south. Subsequently, all were followed by a very long period of slow cooling, which was followed by a rapid emplacement of about 100Ma. The intensive granite emplacement took place all over except northeastern SGFB, with a decrease in emplacement depth from west to east, which was linked with the far-field effect of Lhasa-Qiangtang collision. After this episode, the cooling history of granite in SGFB had a rapid emplacement on the subsurface under the control of the Neo-Tethyan regime. This process has control of the post Late Cretaceous regional magmatic activity and tectonics, as well as the sedimentary response in Sichuan and Xichang basin.
机译：部分由于缺乏结构和沉积记录来限制侏罗纪到白垩纪的演化，青藏高原东缘的一个缺失过程从古特提斯时代到新特提斯时代就已经消失了。基于对125个年龄的热年代学分析（U / Pb，40 Ar / 39 A，87 Rb / 86 Sr，FT，U-Th / He）从西藏东部边缘的火成岩中，我们提出了一种多系统热年代学方法来恢复花岗岩的冷却和定位并破译缺失的过程。我们的综合研究表明，从古特提斯时代到新特提斯时代的晚期白垩纪（约100Ma）构造发生了重要变化。在三叠纪晚期，松潘—甘孜褶皱带（SGFB）的花岗岩初始赋存特征是，赋存年龄和深度从西向东，从北向南减小。随后，所有这些都需要经过很长时间的缓慢冷却，然后迅速放置约100Ma。除了东北SGFB以外，整个地方都发生了密集的花岗岩沉积，其沉积深度从西向东减小，这与拉萨-ian塘碰撞的远场效应有关。在此事件之后，SGFB中花岗岩的冷却历史在新特提斯政权的控制下在地下迅速沉积。这个过程控制了晚白垩世后期的岩浆活动和构造，以及四川和西昌盆地的沉积响应。

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  • 来源
    《Journal of the Geological Society of India》 |2012年第2期|p.241-254|共14页
  • 作者

    Bin Deng; Shugen Liu; Zhiwu Li; Junxing Cao; Wei Sun;

  • 作者单位

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology, Chengdu, China;

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology, Chengdu, China;

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology, Chengdu, China;

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology, Chengdu, China;

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology, Chengdu, China;

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  • 正文语种 eng
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  • 关键词

    Multisystem thermochronology; Late Cretaceous; Tectonic change; Eastern margin of Tibetan Plateau;

    机译：多系统热年代学;晚白垩世;构造变化;青藏高原东缘;

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