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首页> 外文期刊>Journal of Asian earth sciences >Eocene to Pliocene exhumation history of the Tianshui-Huicheng region determined by Apatite fission track thermochronology: Implications for evolution of the northeastern Tibetan Plateau margin
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Eocene to Pliocene exhumation history of the Tianshui-Huicheng region determined by Apatite fission track thermochronology: Implications for evolution of the northeastern Tibetan Plateau margin

机译：磷灰石裂变径迹热年代学确定的天水-回城地区始新世至上新世发掘史：对东北高原边缘演化的启示

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摘要

This study presents new apatite fission-track (AFT) data from the Tianshui-Huicheng region, which is sit uated in the northeastern margin of the Tibetan Plateau. AFT results (including 19 detrital and 13 bedrock samples) show that deposition in the Tianshui-Huicheng basin range from early Eocene to late Miocene-Pliocene and most of the apatites derived from the Western Qinling orogenic belt, reflecting one rapid exhumation episode (at 34-29 Ma) and two phases of volcanism (at 23-18 Ma and ca. 13 Ma). The exhu mation history of the Tianshui-Huicheng region is likely related to episodic tectonic activity and directly linked to the kinematics of active deformation of the Tibetan Plateau. Active processes deciphered from the detritus indicate that deformation reached the northeastern Tibetan Plateau margin as early as ca. 49 Ma, which is manifested by the initiation of the Tianshui-Huicheng basin. The 23-18 Ma event, linked to the lithosphere deformation of the Western Qinling and the Neogene basin formation along the Tian shui-Huicheng region. By modeling the bedrock samples, an 8-4 Ma event was revealed which resulted from the intense deformation of the Tianshui-Huicheng region.
机译：本研究提供了位于青藏高原东北缘的天水-回城地区的新磷灰石裂变径迹（AFT）数据。 AFT结果（包括19个碎屑岩和13个基岩样品）表明，天水-惠城盆地的沉积范围从始新世早期到中新世-上新世晚期，并且大多数磷灰石来源于西秦岭造山带，反映了一次快速的发掘事件（34岁） -29 Ma）和两个阶段的火山活动（分别在23-18 Ma和大约13 Ma）。天水-回城地区的发掘历史很可能与间歇性构造活动有关，并且与青藏高原活动变形的运动学直接相关。从碎屑中解脱出来的活跃过程表明，变形早在约青藏高原的东北部就达到了。 49 Ma，表现为天水-回城盆地的开始。 23-18 Ma事件，与西秦岭的岩石圈变形和沿天水惠城地区的新近纪盆地形成有关。通过对基岩样品进行建模，揭示了一个8-4 Ma事件，这是天水-回城地区强烈变形导致的。

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  • 来源
    《Journal of Asian earth sciences》 |2011年第2期|p.97-110|共14页
  • 作者

    Xiuxi Wang; Massimiliano Zattin; Jijun Li; Chunhui Song; Tingjiang Peng; Shanpin Liu; Bin Liu;

  • 作者单位

    College of Earth and Environmental Sciences & MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, Gansu, China,Dipartimento di Scienze delta Terra e Geologico-Ambientali, Universita di Bologna, Via Zamboni 67, 40126 Bologna, Italy;

    Dipartimento di Geoscienze, Universita di Padova, Via Gradenigo 6, 35131 Padova, Italy;

    College of Earth and Environmental Sciences & MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, Gansu, China;

    College of Earth and Environmental Sciences & MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, Gansu, China;

    College of Earth and Environmental Sciences & MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, Gansu, China;

    College of Earth and Environmental Sciences & MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, Gansu, China;

    College of Earth and Environmental Sciences & MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, Gansu, China;

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  • 正文语种 eng
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  • 关键词

    cenozoic; tianshui-huicheng region; tibetan plateau; fission track;

    机译：新生代;天水回城区;西藏高原;裂变径迹;

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