| 西藏高原那曲至亚东测线地壳、上地幔的大地电磁研究 |
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| 引用本文： | 任爱华,石应骏,李宗舜,李红征,杨仲武,黄伯民,陈光明.西藏高原那曲至亚东测线地壳、上地幔的大地电磁研究[J].地球物理学报,1982,25(5):457-463. |
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| 作者姓名： | 任爱华 石应骏 李宗舜 李红征 杨仲武 黄伯民 陈光明 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 摘 要： | 我们用自制仪器于1977年首次在西藏高原进行了大地电磁测量。本文给出了那曲、曲水、江孜、帕里、亚东5个测点的测量和反演结果。 5个测点均反映为五层地电模型。得到如下结果: 1.那曲、曲水、江孜、帕里及亚东前四层总厚度分别为:66、65、62、57、50公里; 2.各测点电性特征相似,均属低-高-低型; 3.各测点的地壳中均存在一低阻层,其埋深约为10-20公里; 4.以雅鲁藏布江为界,南北两地区电性层厚度变化程度有显著差异,北部平缓,南部较剧; 5.表面沉积层厚度在4公里左右。
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| 关 键 词： | 大地电磁测深 低阻层 亚东 地壳 西藏高原 上地幔 测线 视电阻率 椭率 雅鲁藏布江 |
| 收稿时间： | 1981-04-07 |
A MAGNETOTELLURIC STUDY OF THE EARTH'S CRUST ANDUPPER MANTLE ALONG A LINE FROM NAGQU TOYADONG IN XIZANG PLATEAU |
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| REN AI-HUA,SHI YING-JUN,LI ZONG-SHUN,LI HONG-ZHENG,YANG ZHONG-WU,HUANG BO-MIN,CHEN GUANG-MING.A MAGNETOTELLURIC STUDY OF THE EARTH'S CRUST ANDUPPER MANTLE ALONG A LINE FROM NAGQU TOYADONG IN XIZANG PLATEAU[J].Chinese Journal of Geophysics,1982,25(5):457-463. |
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| Authors: | REN AI-HUA SHI YING-JUN LI ZONG-SHUN LI HONG-ZHENG YANG ZHONG-WU HUANG BO-MIN CHEN GUANG-MING |
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| Institution: | Institute of Geophysics, Academia Sinica |
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| Abstract: | Magnetotelluric measurements were carried out in Xizang plateau during June-September, 1977 by use of home-made equipment. The results of measurements and their interpretations are presented.Five sites along a line of over 500 km across the strike direction of the geological structure are chosen for MT measurements. From north to south they are Nagqu, Quxu, Gyangze, Pagri and Yadong.The data for each site are processed by the method of the tensor impedance estimates and various parameters are calculated. They are azimuths of the principal impedance axes, principal impedance, apparent resistivities parallel and perpendicular to the strike, ellipticity factors and so on. By using Marquardt method, a one-dimensional inversion is made. A five-layer model of the conductivity distribution is derived for the five sites. From this model, we obtain the following conclusions:1. The total thickness of the upper four layer at Nagqu, Qiixii, Gyangze, Pagri and Yadong are 66, 65, 62, 57 and 50 km respectively. They approximately agree with other geophysical results if they are taken to be the thickness of the earth's crust.2. The tendency of the conductivity distribution at the five sites is in good accord. They all belong to low-high-low type.3. There is a low resistivity zone in the earth's crust at investigated sites, the depth of which is about 10 to 20 km.4. There are marked differences in variations of conductivity structures in the regions situated to two sides of the Yarlung Zangbo River. The variations in the northern region are gentle, but sharp in the southern one.5. The depth of the surface sedimentary complex is about four kilometers. |
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