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首页> 外文期刊>Journal of Asian earth sciences >Kinematic variability of late Cenozoic fault systems and contrasting mountain building processes in the Alxa block, western China
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Kinematic variability of late Cenozoic fault systems and contrasting mountain building processes in the Alxa block, western China

机译：中国西部Alxa Block晚年中生代故障系统的运动变异性和山地建筑工程

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摘要

In this study, new structural field data and geological observations are coupled with remote sensing analysis and compilation of previous published work to establish a new kinematic framework for the neotectonic reactivation of the Alxa block, China. The Alxa block occupies a key position in Central Asia north and east of the contractional and sinistrally transpressive deforming zones of the Qilianshan-Hexi Corridor-easternmost Altyn Tagh Fault and Beishan deforming belts, south of the sinistrally transpressive southernmost Gobi Altai, and west of - or overlapping with Ordos block extensional and transtensional graben systems. In addition, the Alxa block is internally transected by important fault systems (Bayan Nuru, Bayanwula, Chahanbulage) that record previously unrecognized Late Cenozoic activity. Active mountain building processes in the Alxa block show remarkable variation from large extensional horst blocks (Helanshan, SW Langshan, SW Yabrai) to localized uplifts along sinistral wrench-belts (Bigesitai) to dominantly contractional (Longshoushan) and sinistral transpressional ranges (Helishan). The triangular wedge-shape of the Alxa block likely pre-disposed it to eastward extrusion in response to NE-directed India-Eurasia collision-derived compressional stresses from the south, and E-W tensional forces driven by Pacific margin rollback to the east. A combination of inherited regional lithospheric structure and the modern east-directed geodetically derived crustal velocity field led to: 1) crustal thinning and subsidence of the Ejina basin to the west in the wake of the eastward extruding Alxa block, and 2) distributed sinistral transtension and crustal extension within the Alxa block interior, and in the Hetao and Yinchuan grabens to the east.
机译：在这项研究中，新的结构现场数据和地质观察与遥感分析和上一篇公布工作的汇编相结合，为中国Alxa Block的Neotonic Recoration建立了新的运动框架。 Alxa Block占据中亚的一个关键位置北部和东部的祁连山 - 河西走廊 - 东部最大的Altyn Tagh Fault和北山变形皮带，南部的颅骨胸部以南的戈壁Altai和西部 - 或与ORDOS块扩展和触发Graben系统重叠。此外，ALXA块由重要故障系统（Bayan Nuru，Bayanwula，Chahanbulage）内部转染，以记录以前无法识别的新生代活动。 Alxa块中的主动山地建筑工程展现了大型广州霍斯特街（Helanshan，SW Langshan，SW Yabrai）的卓越变化，沿着Sinistral腕带（Bigesitai）沿着初始化的隆起（Bigesitai）到占主导地位的合同（龙申山）和Sinistral Transpressional范围（北北山）。 Alxa块的三角形楔形可能预先将其预先设置为反向挤出，以应对来自南部的Ne-pire-Eurasia碰撞衍生的压缩应力，以及由太平洋边缘回滚到东部的E-W张力。继承的区域岩石结构和现代东部地理性衍生的地壳速度场的结合导致：1）在东方挤压Alxa块之后，ejina盆地的地壳变薄和ejina盆地的沉降，以及2）分布式朝南静脉和阿克萨块内部内的地壳延伸，并在季度和银川争夺东方。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第1期|104597.1-104597.23|共23页
  • 作者

    Zhang Jin; Cunningham Dickson; Yun Long; Qu Junfeng; Zhao Heng; Zhang Beihang; Niu Pengfei; Hui Jie;

  • 作者单位

    Chinese Acad Geol Sci Inst Geol Key Lab Deep Earth Dynam Minist Nat Resources Beijing 100037 Peoples R China;

    Eastern Connecticut State Univ Dept Environm Earth Sci Willimantic CT 06226 USA;

    Beijing Res Inst Uranium Geol Beijing 100029 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Key Lab Deep Earth Dynam Minist Nat Resources Beijing 100037 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Key Lab Deep Earth Dynam Minist Nat Resources Beijing 100037 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Key Lab Deep Earth Dynam Minist Nat Resources Beijing 100037 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Key Lab Deep Earth Dynam Minist Nat Resources Beijing 100037 Peoples R China;

    Univ Chinese Acad Sci Beijing 100049 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Alxa block; Active tectonics; Intraplate deformation; Crustal reactivation; Earthquake hazards; China;

    机译：Alxa Block;活跃的构造;体内变形;地壳重新激活;地震危害;中国;

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