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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >The Crust in the Pamir: Insights From Receiver Functions
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The Crust in the Pamir: Insights From Receiver Functions

机译：Pamir中的外壳：接收器功能的见解

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摘要

The Cenozoic convergence between India and Asia has created Earth's thickest crust in the Pamir‐Tibet Plateau by extreme crustal shortening. Here we study the crustal structure of the Pamir and western Tian Shan, the adjacent margins of the Tajik, Tarim, and Ferghana Basins, and the Hindu Kush, using data collected by temporary seismic experiments. We derive, compare, and combine independent observations from P and S receiver functions. The obtained Moho depth varies from ~40 km below the basins to a double‐normal thickness of 65-75 km underneath the Pamir and Hindu Kush. A Moho doublet—with the deeper interface down to a depth of ~90 km—coincides with the arc of intermediatedepth seismicity underneath the Pamir, where Asian continental lower crust delaminates and rolls back. The crust beneath most of the Central and South Pamir has a low V_p/V_s ratio (<1.70), suggesting a dominantly felsic composition, probably a result of delamination/foundering of the mafic rocks of the lower crust. Beneath the Cenozoic gneiss domes of the Central and South Pamir, which represent extensional core complexes, the V_p/V_s ratios are moderate to high (~1.75), consistent with the previously observed, midcrustal low‐velocity zones, implying the presence of crustal partial melts. Even higher crustal average V_p/V_s ratios up to 1.90 are found in the sedimentary basins and along the Main Pamir Thrust. The ratios along the latter—the active thrust front of the Pamir—may reflect fluid accumulations within a strongly fractured fault system.
机译：印度和亚洲之间的新生代融合在极端地壳缩短时创造了帕米尔 - 西藏高原的地壳。在这里，我们研究了帕米尔和西山的地壳结构，塔吉克，塔里木和菲尔格纳盆地的相邻边缘，以及使用临时地震实验所收集的数据。我们从P和S接收器功能中得出，比较和结合独立的观察结果。所获得的Moho深度从盆地下方〜40km左右变化，在PAMIR和印度科犬下面的双正常厚度为65-75 km。一个Moho Doublet-with较深的界面，深度〜90公里 - 帕米尔下面的中间型震动弧，其中亚洲大陆下面地壳分层并回滚。大多数中南帕米尔下方的地壳具有低V_P / V_S比率（<1.70），旨在占据主导的铰接性组成，可能是下壳的MAFIC岩石的分层/创造的结果。在中南帕米尔的新生代片状圆顶下方，代表延伸核心复合物，V_P / V_S比率适中高达（〜1.75），与先前观察到的中间型低速区一致，暗示了地壳偏的存在融化。在沉积盆地中发现甚至更高的地壳平均V_P / V_S比率在沉积盆地和主要的PAMIR推力中发现。沿着后者的比率 - 帕米尔的主动推力前部 - 可以反映在强烈断裂的故障系统内的流体累积。

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  • 作者

    F.M. Schneider; X. Yuan; B. Schurr; J. Mechie; C. Sippl; S.-K. Kufner; L. Ratschbacher; F. Tilmann; I. Oimahmadov; M. Gadoev; V. Minaev; U. Abdybachaev; S. Orunbaev; A. Ischuk; S. Murodkulov;

  • 作者单位

    Deutsches GeoForschungsZentrum ‐ GFZ Potsdam Germany;

    Deutsches GeoForschungsZentrum ‐ GFZ Potsdam Germany;

    Deutsches GeoForschungsZentrum ‐ GFZ Potsdam Germany;

    Deutsches GeoForschungsZentrum ‐ GFZ Potsdam Germany;

    Deutsches GeoForschungsZentrum ‐ GFZ Potsdam Germany;

    Deutsches GeoForschungsZentrum ‐ GFZ Potsdam Germany;

    Institut für Geologie Technische Universit?t Bergakademie Freiberg Freiberg Germany;

    Deutsches GeoForschungsZentrum ‐ GFZ Potsdam Germany;

    Institute of Geology Earthquake Engineering and Seismology Academy of Sciences of the Republic of Tajikistan Dushanbe Tajikistan;

    Institute of Geology Earthquake Engineering and Seismology Academy of Sciences of the Republic of Tajikistan Dushanbe Tajikistan;

    Institute of Geology Earthquake Engineering and Seismology Academy of Sciences of the Republic of Tajikistan Dushanbe Tajikistan;

    Central Asian Institute for Applied Geosciences Bishkek Kyrgyzstan;

    Central Asian Institute for Applied Geosciences Bishkek Kyrgyzstan;

    Institute of Geology Earthquake Engineering and Seismology Academy of Sciences of the Republic of Tajikistan Dushanbe Tajikistan;

    Institute of Geology Earthquake Engineering and Seismology Academy of Sciences of the Republic of Tajikistan Dushanbe Tajikistan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    The Crust; the Pamir; Insights;

    机译：地壳;帕米尔;见解;

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