| 青藏高原吉隆-鲁谷(Hi-Climb)层析成像与印藏碰撞的消减作用 |
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| 引用本文： | 钱辉,姜枚,CHEN Wang-Ping,John Nabelek,Zhao Da-peng,赵磊,王亚军.青藏高原吉隆-鲁谷(Hi-Climb)层析成像与印藏碰撞的消减作用[J].地球物理学报,2007,50(5):1427-1436. |
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| 作者姓名： | 钱辉 姜枚 CHEN Wang-Ping John Nabelek Zhao Da-peng 赵磊 王亚军 |
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| 作者单位： | 1.中国地质科学院地质研究所，国土资源部大陆动力学重点实验室，北京 100037;2.Dept. Geology, Univ. of Illinois, 1310 W. Green St., Urbana, IL,United States 61801;3.College Ocean. Atm. Sci., Oregon State University, Corvallis, OR,United State;s 97331-550;4.Geodynamics Research Center,Ehime niversity,Matsuyama,Japan 790-8577 |
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| 基金项目： | 国土资源部“青藏高原的碰撞造山作用及其效应专项”(2001010206)，美国NSF(EAR99-09609)资助 |
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| 摘 要： | 利用中美合作Hi-Climb项目北段吉隆-鲁谷剖面的天然地震探测数据，拾取2004～2005年期间5级以上地震事件的P波与4级以上地震的Pn波震相的走时，通过多震相层析成像反演获得青藏高原腹地的地下500 km以上的P波速度扰动结构.结果表明雅江地区为北向倾斜的低速扰动，班公-怒江断裂下方存在向南俯冲并被印度板块俯冲挤压而回折的高速体，建立了印度板块在冈底斯地块下方拆沉并被雅江低速体穿越的构造样式.说明印度板块俯冲在到达班公-怒江缝合带之前已经开始消减，与拆沉位置对比发现，印度板块的前锋深部呈现多期多级次特征，并受到地幔热循环作用的影响.
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| 关 键 词： | 层析成像 青藏高原 拆沉作用 雅鲁藏布缝合带 班公怒江缝合带 |
| 文章编号： | 0001-5733（2007）05-1427-10 |
| 收稿时间： | 2006-6-19 |
| 修稿时间： | 2006-06-19 |
Tomography of Gyirong- Lugu profile (Hi- Climb) and the subduction of Indian-Tibet collision |
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| QIAN Hui,JIANG Mei,CHEN Wang-Ping,John Nabelek,Zhao Da-peng,ZHAO Lei,WANG Ya-Jun.Tomography of Gyirong- Lugu profile (Hi- Climb) and the subduction of Indian-Tibet collision[J].Chinese Journal of Geophysics,2007,50(5):1427-1436. |
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| Authors: | QIAN Hui JIANG Mei CHEN Wang-Ping John Nabelek Zhao Da-peng ZHAO Lei WANG Ya-Jun |
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| Institution: | 1.Key Laboratory for Continental Dynamics of the Ministry of Land and esources ;of China,Institute of Geology, Chinese Academy of Geological Science，Beijing 100037,China;2.Dept. Geology, Univ. of Illinois, 1310 W. Green St., Urbana, IL 61801,United States;3.College Ocean. Atm. Sci., Oregon State University, Corvallis, OR 97331-550,United States;4.Geodynamics Research Center,Ehime University,Matsuyama 790-8577,Japan |
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| Abstract: | Utilizing the seismological data collected by Sino-US cooperated project Hi-Climb, crossing the north part of the profile from Gyirong to Lugu, we picked the arrival times of P phases from earthquakes larger than Mb 5.0 and Pn phases from that lager than Mb 4.0 recorded during 2004 - 2005. Through multi-phase tomography inversion the P wave velocity perturbations down to 500 km below the central part of Tibetan Plateau were determined. It is found that there is a northward dipping low velocity perturbation zone in the Yarlun- Tsangbo Suture area, and a southward subduction zone beneath Bangong-Nujiang Suture which may be lifted by Indian Plate subduction, and the delamination of Indian Plate beneath Gangdes block may be cut through by the low velocity zone at Yarlun Suture. The tectonic style illustrates that Indian Plate should have subducted before it may reach Bangong-Nujiang Suture, and that the frontier of Indian Plate presents multi-phase multi-level feature according to the delaminated position, and may also be affected by the thermo-cycle of lower mantle. |
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| Keywords: | Tomography Tibetan Plateau Delamination Yarlun-Tsangbo Suture Bangong-Nujiang Suture |
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