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首页> 外文期刊>Journal of Asian earth sciences >Provenance of Oligocene-Miocene sediments in the Subei area, eastern Altyn Tagh fault and its geological implications: Evidence from detrital zircons LA-ICP-MS U-Pb chronology
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Provenance of Oligocene-Miocene sediments in the Subei area, eastern Altyn Tagh fault and its geological implications: Evidence from detrital zircons LA-ICP-MS U-Pb chronology

机译：阿尔金塔格断裂东部苏北地区渐新世-中新世沉积物来源及其地质意义：碎屑锆石LA-ICP-MS U-Pb年代学证据

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摘要

Oligocene-Miocene strata in the Subei and Xiaobiegai basins of the Subei area, located in the eastern Altyn Tagh fault (ATF), northern Tibetan Plateau, record important characteristics of the ATF evolution. Detrital zircons laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb ages from two samples, together with paleocurrent directions and clastic composition in the Xishuigou section demonstrate that sediments in the Subei basin originated from the Danghenanshan range along its southern margin. Detrital zircons U-Pb ages from three samples in the Xiaobiegai basin, together with paleocurrent directions and clastic composition, indicate that sediments in the Xiaobiegai basin may partly originate from terranes along the northeastern margin of the basin in addition to the Danghenanshan range. Our results, combined with regional evolution, suggest that the Xiaobiegai and the Subei basins was a combined basin in Oligocene-early Miocene. This basin was folded, tilted, and dislocated at ca. 8 Ma by rapid uplift of the northern Tibetan plateau and rapid strike-slip of the ATF. As a result, the Subei basin became a thrust-fold belt of the Danghenanshan range front, and the Xiaobiegai basin grew into an intermontane basin in the northeastern part of the Danghenanshan range. Thus, the Subei area gradually acquired its present morphotectonic patterns.
机译：苏北地区苏北和小别盖盆地的渐新世-中新世地层记录了ATF演化的重要特征，该地区位于青藏高原北部的东部阿尔金塔格断层（ATF）。两种样品的碎屑锆石激光烧蚀-电感耦合等离子体质谱法（LA-ICP-MS）的U-Pb年龄，以及西水沟断面的古流向和碎屑成分表明，苏北盆地的沉积物起源于沿沿党河南山范围的沉积物。它的南部边缘。小别盖盆地三个样品的碎屑锆石U-Pb年龄，古流向和碎屑成分表明，小别盖盆地的沉积物可能除端河南山山脉外还部分来自盆地东北缘的地层。我们的研究结果与区域演化相结合，表明小别盖盆地和苏北盆地是渐新世-早中新世的组合盆地。将该盆折叠，倾斜并在大约90°处移位。青藏高原北部的快速隆升和ATF的快速走滑导致8 Ma。其结果是，苏北盆地成为当干山山脉前缘的逆冲褶皱带，小别盖盆地在当干山山脉的东北部发展成为山间盆地。因此，苏北地区逐渐获得了目前的构造构造模式。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第15期|130-140|共11页
  • 作者

    Jianfeng Li; Zhicheng Zhang; Wenhao Tang; Ke Li; Zhiwen Luo; Jie Li;

  • 作者单位

    MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China,School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China,Department of Geology, School of Earth and Space Sciences, Peking University, Room 3307, Yifu-2 Building, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China;

    MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China,School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China,School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    MOE Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China,School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    Research Institute of Exploration and Development, Tuha Oilfield Company, PetroChina, Hami, Xinjiang 839009, China;

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  • 正文语种 eng
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  • 关键词

    Altyn Tagh fault (ATF); Subei basin; Xiaobiegai basin; Detrital zircon LA-ICP-MS dating; Paleocurrent; Clastic composition;

    机译：Altyn Tagh故障（ATF）;苏北盆地小别改盆地碎屑锆石LA-ICP-MS测年;古流碎屑成分;

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