| 西藏高原南部雅鲁藏布江缝合带地区地壳电性结构研究 |
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| 引用本文： | 谭捍东,魏文博,Martyn Unsworth,邓明,金胜,John Booker,Alan Jones.西藏高原南部雅鲁藏布江缝合带地区地壳电性结构研究[J].地球物理学报,2004,47(4):685-690. |
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| 作者姓名： | 谭捍东 魏文博 Martyn Unsworth 邓明 金胜 John Booker Alan Jones |
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| 作者单位： | 中国地质大学地球物理与信息技术学院,地下信息探测技术与仪器教育部重点实验室,北京,100083;University of Albert,Edmonton,Canada;University of Washington,Seattle,USA;Geological Survey of Canada,Canada |
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| 基金项目： | 国家自然科学基金项目 ( 4 0 0 740 19)，国家重点基础研究发展规划项目 (G19980 40 80 0 )，国土资源部“十五”青藏专项计划项目( 2 0 0 10 10 2 0 2 )，国土资源部“十五”专项计划项目 ( 2 0 0 0 10 10 2 0 1)资助 |
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| 摘 要： | 为了探测西藏高原南部雅鲁藏布江缝合带地区地壳浅部和深部构造沿东西和南北方向的变化特征，在雅鲁藏布江缝合带地区布设了三条南北向剖面(错那—墨竹工卡、亚东—雪古拉、吉隆—措勤)，采用超宽频带大地电磁测深方法进行了地壳、上地幔电性结构探测研究，发现该区主要电性结构特征为：1. 雅鲁藏布江缝合带附近表层发育大规模的高阻体,岩体延伸最深达30km以上，是冈底斯花岗岩体的反映. 2. 雅鲁藏布江缝合带的南部有小规模的良导体，在其下方和北侧发育有大规模良导体. 3. 沿剖面从南往北壳内普遍发育良导体，各良导体主体间是不连续的，规模逐渐增大，总体北倾，在缝合带附近产状较陡. 4. 在雅鲁藏布江缝合带附近良导体由西往东规模逐渐增大，导电性逐渐变好，相对雅鲁藏布江在剖面上的位置逐渐南移. 这些重要的电性特征可能是印度板块向北俯冲所形成的，深部大规模的良导体特征沿东西向的差异可能是板块碰撞引起物质沿东西向运移作用的结果.
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| 关 键 词： | 电性结构 大地电磁测深 雅鲁藏布江缝合带 西藏高原南部 |
| 文章编号： | 0001-5733(2004)04-0685-06 |
| 收稿时间： | 2003-8-7 |
| 修稿时间： | 2004-4-5 |
Martyn Unsworth, et al. Crustal electrical conductivity structure beneath the Yarlung Zangbo Jiang suture in the southern Xizang plateau |
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| TAN Han-Dong WEI Wen-Bo Martyn Unsworth DENG Ming JIN Sheng John Booker Alan Jones School of Geophysics and Information Technology,China University of Geosciences, Geo-detection Laboratory,Ministry of Education,Beijing ,China University of Albert,Edmonton,Canada University of Washington,Seattle,USA Geological Survey of Canada,Canada.Martyn Unsworth, et al. Crustal electrical conductivity structure beneath the Yarlung Zangbo Jiang suture in the southern Xizang plateau[J].Chinese Journal of Geophysics,2004,47(4):685-690. |
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| Authors: | TAN Han-Dong WEI Wen-Bo Martyn Unsworth DENG Ming JIN Sheng John Booker Alan Jones School of Geophysics and Information Technology China University of Geosciences Geo-detection Laboratory Ministry of Education Beijing China University of Albert Edmonton Canada University of Washington Seattle USA Geological Survey of Canada Canada |
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| Institution: | 1.School of Geophysics and Information Technology, China University of Geosciences； Geo detection Laboratory, Ministry of Education, Beijing 100083, China 2 University of Albert, Edmonton, Canada 3 University of Washington, Seattle, USA 4 Geological Survey of Canada, Canada |
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| Abstract: | To study the structure in the shallow and deep crust along the east west and north south direction beneath the Yarlung Zangbo Jiang suture in the southern part of Xizang plateau, three magnetotelluric profiles with super wide band of frequencies (Cona Maizhokunggar, Yadong Xuegula, Gyirong Coqên) across the Yarlung Zangbo Jiang suture were deployed. The result shows that larg e scale high resistive bodies exist near the Yaluzangbu suture surface, which e xtend to the maximum depth of more than 30km. They are the reflection of the Gan gdese granite. There are small scale conductive bodies in the southern part of the Yarlung Zangbo Jiang suture, and large scale ones under the suture and in t he norther n part. Conductive bodies widely spread in the crust from south to north along t he profiles. They are discontinuous with each other, and become larger in scale from south to north. They decline to the north, and are the steepest near the su ture becoming deeper gradually from about 20km depth in the south part to about 70km depth in the middle of the suture. Under the Yarlung Zangbo Jiang suture, t he conduct ive bodies becomes larger in scale, more conductive gradually from west to east. These important electrical characters are possibly caused by the India plate un derthrusting to the north. The variation in characters of the large scale condu ctive bodies from west to east may be the proof that plate collision causes mate rials moving to the east |
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| Keywords: | Electrical conductivity structure Magnetotelluric sounding Yarlung Zangbo Jiang Suture Southern Xizang Plateau |
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