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首页> 外文期刊>Geochemistry, geophysics, geosystems >Along-strike variations in the Himalayan orogenic wedge structure in Bhutan from ambient seismic noise tomography
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Along-strike variations in the Himalayan orogenic wedge structure in Bhutan from ambient seismic noise tomography

机译：来自环境地震噪声断层扫描的不丹在不丹的喜马拉雅造山楔结构沿着罢工变化

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摘要

The geological units and tectonic structure exposed in the Bhutan Himalaya document significant regional variations, expressed primarily as tectonic windows and klippen. The along-strike variations of these structures and their metamorphic grade are usually associated with the formation of local duplexes in the underlying tectonic units. To investigate these variations and their extent in depth, we image the isotropic shear-wave velocity structure of the orogenic wedge by ambient noise tomography. Group velocities are extracted from cross correlations of ambient seismic noise, recorded by the temporary GANSSER network in Bhutan. The upper crustal structure beneath Bhutan is mapped down to 18 km depth by directly inverting Rayleigh-wave group velocity measurements in the period range between 2 and 20 s with a ray tracing based inversion approach. Our results reveal several distinct high shear-wave velocity anomalies (>= 3.6 km/s) and reflect the along-strike variations in the upper crustal structure in relation to the alternating tectonic windows and klippen at the surface. In correlation with the surface geology in the northern part of Bhutan, we interpret shallow high shear-wave velocity anomalies as quarzite-dominated rocks or felsic migmatites with large intrusions of leucogranites. High-velocity anomalies in the orogenic wedge in eastern and western Bhutan correlate with the local geometry of the Main Himalayan Thrust and provide evidence for the formation and depth extent of localized duplexes of quartzite dominated lithology in association with the formation of tectonic windows in the Bhutan Himalaya.
机译：在不丹喜马拉雅州内暴露的地质单位和构造结构文献显着的区域变化，主要表达为构造窗口和klippen。这些结构及其变质等级的沿着打击变化通常与底层构造单元中的局部双工的形成相关。为了研究这些变化及其深度的程度，我们通过环境噪声断层扫描将OrentoNic楔的各向同性剪切波速度结构图像图像。组速度从环境抗震噪声的交叉相关性提取，由不丹临时甘草网络记录。通过基于光线跟踪的反转方法直接反转瑞利波组速度测量，不丹下方的上层地壳结构通过直接反转到18km深度。我们的结果揭示了几种不同的高剪切波速度异常（> = 3.6 km / s），反映了与表面上交替构造窗口和kllippen的上层地壳结构的沿着打击变化。在与不丹北部的地表地质相关的相关性中，我们将浅层剪切波速度异常解释为Quarzite主导的岩石或具有大型光毒素的侵入性的术。东部和西方的orgenic楔形中的高速异常与主要喜马拉雅大陆的局部几何形状相关，并提供了与不丹构造窗户的形成和深入的石英岩主导岩性局部双工的形成和深度范围的证据喜马拉雅山。

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    Singer Julia; Obermann Anne; Kissling Eduard; Fang Hongjian; Hetenyi Gyorgy; Grujic Djordje;

  • 作者单位

    Swiss Fed Inst Technol Swiss Fed Inst Technol Inst Geophys Zurich Switzerland;

    Swiss Fed Inst Technol Swiss Seismol Serv Zurich Switzerland;

    Swiss Fed Inst Technol Swiss Fed Inst Technol Inst Geophys Zurich Switzerland;

    Univ Sci &

    Technol China Sch Earth &

    Space Sci Lab Seismol &

    Phys Earths Interior Hefei Peoples R China;

    Swiss Fed Inst Technol Swiss Fed Inst Technol Inst Geophys Zurich Switzerland;

    Dalhousie Univ Dept Earth Sci Halifax NS Canada;

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  • 正文语种 eng
  • 中图分类 地球物理学;
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