塔里木盆地晚新生代旋转变形-来自麻扎塔格逆冲带磁组构的证据
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1.东华理工大学;2.中国科学院青藏高原研究所;3.山东省地质科学研究院;4.中国科学院地球环境研究所

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国家自然科学基金项目(编号42164005)和黄土科学全国重点实验室开放基金资助项目(SKLLQG2405)


Late Cenozoic vertical-axis rotation of the Tarim Basin- magnetic fabric evidence from the Mazatagh thrust belt
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1.School of Earth Sciences, East China University of Technology;2.Institute of Tibetan Plateau Research, Chinese Academy of Sciences;3.Shandong Institute of Geological Sciences;4.Institute of Earth Environment, Chinese Academy of Sciences

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    摘要:

    塔里木盆地被西昆仑山和天山褶皱逆冲带围限,其新生代旋转变形过程对理解喜马拉雅西构造结和天山造山带的运动特征具有重要意义。然而目前对塔里木盆地新生代的旋转变形方式和幅度等特征仍存在分歧。本文对塔里木盆地中部麻扎塔格弧形带红白山剖面晚新生代地层开展系统磁组构分析,通过分析磁组构特征并对比古水流方向和物源特征,得出该地区磁组构为初始变形磁组构,能够记录地层沉积时期的古应力方向。经旋转校正后,红白山地区的挤压应力方向为NNE向,与该地区现今GPS揭示的上地壳运动特征一致,与印度-欧亚板块新生代以来近南北向碰撞和持续汇聚过程相关,并指示来自碰撞带的挤压应力至少在9.7 Ma已传播至塔里木盆地内部地区;磁组构揭示的挤压应力方向表明该地区自7.6 Ma以来相对于地球自转轴发生了约7.0°顺时针旋转变形,与古地磁磁偏角揭示的旋转变形方式和幅度一致,并与传统构造地质学方法研究和GPS观测结果吻合,可能代表了塔里木盆地晚新生代真实的旋转变形特征,而盆地周缘已有古地磁结果则更多代表盆地周缘造山带局部的旋转变形特征。塔里木盆地晚新生代顺时针旋转变形可能与帕米尔高原晚中新世以来北向挤压或天山造山带地壳异质性导致的东-西向不均一的上地壳缩短量有关。

    Abstract:

    Surrounded by the West Kunlun Mountains and the Tian Shan fold-and-thrust belts, the Cenozoic vertical-axis rotations of the Tarim Basin are crucial for understanding the kinematic processes of the western Himalayan syntax and the Tian Shan orogeny. However, the Cenozoic rotation pattern and magnitude of the Tarim Basin remain disputed. This study conducted detailed magnetic fabric analyses on Late Cenozoic sediments along the Hongbaishan profile at the Mazatagh thrust belt in the central Tarim Basin. By examining the features of magnetic fabrics, paleocurrent directions and provenance, we concluded that the magnetic fabrics at Hongbaishan were embryonic tectonic fabrics, which can reflect paleostress directions. After rotation correction, the compressional direction during the Late Cenozoic at Hongbaishan was NNE, consistent with the upper-crust vectors revealed by GPS observations. This pattern is primarily related to the nearly N-S-directed India-Eurasia collision and the continuous indentation of the Indian plate into Eurasia since the Cenozoic. This indicates that compressional stress has propagated into the interior of the Tarim Basin since at least ~9.7 Ma from the collisional zone. The compressional stress directions at Hongbaishan, as revealed by magnetic fabrics, indicate that the Mazatagh region has undergone an absolute ~7.0° clockwise rotation since ~7.6 Ma (relative to the spin axis of the Earth). These rotation patterns and magnitudes are consistent with results from classical geological methods and GPS observations and may represent the true rotational features of the Tarim Basin since the Late Cenozoic. However, previous paleomagnetic results surrounding the Tarim Basin mostly reflect local rotation features within the peripheral orogeny. The Late Cenozoic clockwise rotations of the Tarim Basin may be related to the northward indentation of the Pamir salient or the heterogeneity of the Tian Shan, leading to the E-W inhomogeneity of the upper crust.

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  • 收稿日期:2025-04-02
  • 最后修改日期:2025-05-18
  • 录用日期:2025-07-04
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