| 大地电磁测深(MTS)用于研究地壳上地幔的初步成果 |
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| 引用本文： | 李立.大地电磁测深(MTS)用于研究地壳上地幔的初步成果[J].物探与化探,1997,21(6):460-467. |
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| 作者姓名： | 李立 |
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| 作者单位： | 地质矿产部地球物理地球化学勘查研究所!廊坊065000 |
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| 摘 要： | 地质矿产部物化探研究所自1980年先后完成了青藏、川滇、华南、甘肃、新疆、内蒙、山西、松辽、长江中下游、秦岭等地区的深大地电磁测深剖面约6800km。得出了剖面通过地区地壳、上地幔的电性结构,研究了各电性单元与地质构造单元的关系,对发现的地壳、上地幔内低阻层的成因进行了探讨。根据已掌握的深大地电磁数据编制了中国大陆电性图件,得出中国大陆岩石圈的平均厚度为100～120km,东部地区薄,西部地区厚的结论。利用高温高压岩石电阻率测定结果,粗略地给出了剖面通过地区岩石圈内主要的物质组成。
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| 关 键 词： | 大地电磁测深 地壳内低阻层 上地幔内低阻层 岩石圈 |
| 收稿时间： | 1997-08-15 |
THE PRELIMINARY ACHIEVEMENTS OF MAGNETOTELLURIC SOUNDING IN THE STUDY OF THE CRUST AND UPPER MANTLE |
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| Li Li.THE PRELIMINARY ACHIEVEMENTS OF MAGNETOTELLURIC SOUNDING IN THE STUDY OF THE CRUST AND UPPER MANTLE[J].Geophysical and Geochemical Exploration,1997,21(6):460-467. |
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| Authors: | Li Li |
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| Institution: | Institute of Geophysical and Geochemistry Exploration, Ministry of Geology and Mineral Resources, Langfang 065000 |
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| Abstract: | Since 1980, experts of the Institute of Geophysical and Geochemical Exploration have constructed some 6 800 km of deep magnetotelluric sounding profiles in such areas as Qinghai-Tibet, Sichuan-Yunnan, South China, Gansu, Xinjiang, Inner Mongolia, Shanxi, Song-Liao, middle and lower reaches of the Yangtze River and Qinling Mountains, found out electric structure of the crust and the upper mantle along these profiles, studied relationships between electric units and geologic-tectonic units, and probed into the causes for the formation of the low-resistivity layers detected in the crust and the upper mantle. On the basis of the available deep magnetotelluric sounding data, the continental electrical maps of China have been compliled. It is thus known that the continental lithosphere of China has an average thickness of 100～200 km, thinning in the east and thickening in the west. Using electrical resistivities of rocks measured under high temperature and pressure, the researchers have roughly determined material constitutuents of the lithosphere along the profiles. |
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| Keywords: | Magnetotelluric sounding low resistivity layer in the crust low resistivity layer in upper mantle lithosphere |
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