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首页> 外文期刊>Journal of Asian earth sciences >Exhumation of the Dahinggan Mountains, NE China from the Late Mesozoic to the Cenozoic: New evidence from fission-track thermochronology
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Exhumation of the Dahinggan Mountains, NE China from the Late Mesozoic to the Cenozoic: New evidence from fission-track thermochronology

机译：从中生代到新生代的中国东北大庆干山的发掘：裂变径迹热年代学的新证据

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摘要

Zircon and apatite fission-track (FT) analyses were used to reveal the exhumation of Phanerozoic granit oid intrusions in the Dahinggan Mountains, northeastern China. Zircon FT ages ranging from 84 ± 5 to 97 ± 8 Ma, and apatite FT ages from 47 ± 3 to 67 + 4 Ma with mean track lengths between 12.3 ± 2.3 and 13.3 ± 2.2 μm, respectively, were obtained for the Phanerozoic granitoids sampled along a south-south-west to north-north-east transect across the Dahinggan Mountains. Three cooling stages from the Late Mesozoic to the Cenozoic have been identified in the studied region based on FT results and modeling. Stage one was a rapid cooling period from the closure temperature of zircon FT to the high temperature part of the apatite FT partial annealing zone (~210-110 ℃) during ~90-57 Ma. Stage two was a relatively slow cooling period (~110-60 ℃) occurred between ~57 Ma and 20 Ma, suggesting that the granitoids had been exhumed to depths of ~l-2 km. The final stage was a cooling period (60-20 ℃) occurred since the Miocene, which bring studied samples to the Earth's surface at an accelerated exhu mation rate. The estimated maximum exhumation is ~5 km assuming a steady-state geothermal gradient of 35 ℃/km. Our results indicate that this exhumation is possibly led by the Pacific plate subduction com bined with intracontinental orogeny associated with asthenospheric upwelling.
机译：锆石和磷灰石裂变径迹（FT）分析被用来揭示在中国东北大兴安岭的古生代花岗岩类侵入体的发掘。采自生代花岗岩的锆石FT年龄范围为84±5至97±8 Ma，磷灰石FT年龄范围为47±3至67 + 4 Ma，平均磁道长度分别在12.3±2.3和13.3±2.2μm之间沿横跨大兴安岭的西南偏南到东北偏北的断面。根据FT结果和模型，在研究区域中确定了从中生代晚期到新生代三个冷却阶段。第一阶段是在约90-57 Ma的时间内从锆石FT的关闭温度到磷灰石FT部分退火区的高温部分（〜210-110℃）的快速冷却期。第二阶段是在〜57 Ma和20 Ma之间出现了一个相对较慢的冷却时间（〜110-60℃），这表明花岗岩已经被挖掘到〜1-2 km的深度。最后的阶段是中新世以来的冷却期（60-20℃），这使被研究的样品以更快的发掘速率到达地球表面。假设稳态地热梯度为35℃/ km，估计的最大发掘量约为5 km。我们的研究结果表明，这种发掘可能是由太平洋板块俯冲作用与与软流圈上升相关的洲内造山运动共同导致的。

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  • 来源
    《Journal of Asian earth sciences》 |2011年第2期|p.123-133|共11页
  • 作者

    Xiaoming Li; Xiaoyong Yang; Bin Xia; Guilun Gong; Yehua Shan; Qiaosong Zeng; Wei Li; Weidong Sun;

  • 作者单位

    Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;

    Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

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  • 关键词

    fission-track; exhumation; the dahinggan mountains; late mesozoic-cenozoic; geodynamics;

    机译：裂变径迹;掘尸;大兴安岭;晚中生代新生代;地球动力学;

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