| 河西走廊东部地区的大地电磁测深研究 |
| |
| 引用本文： | 林长佑,张云琳,司玉兰,蒋梅,李柱国.河西走廊东部地区的大地电磁测深研究[J].地球物理学报,1984,27(2):131-143. |
| |
| 作者姓名： | 林长佑 张云琳 司玉兰 蒋梅 李柱国 |
| |
| 作者单位： | 国家地震局兰州地震研究所 |
| |
| 摘 要： | 本文给出了河西走廊东部地区十个大地电磁测深点结果。我们发现,在横穿走廊的方向上,地壳、上地幔的电导率分布发生了明显的横向变化,显示出某种带状特征。走廊盆地的下部地壳内存在一异常低阻层,其表面深度在45-50公里之间,电阻率为数个欧姆·米,厚度在5公里以内。讨论了横穿青藏高原东北缘和东缘上地幔第一个低阻层埋深的变化。并初步探讨了某些电性特征层的成因和作用。
|
| 关 键 词： | 低阻层 大地电磁测深 河西走廊东部 下部地壳 软流圈 挥发性组份 部分熔化 一维反演 层参数 视电阻率曲线 |
| 收稿时间： | 1982-02-01 |
ON THE MAGNETOTELLURIC RESEARCH IN THE EASTERN REGION OF THE HE-XI CORRIDOR |
| |
| LIN CHANG-YOU,ZHANG YUN-LIN,SHI YU-LAN,JIAN MEI,LI ZHU-GUO.ON THE MAGNETOTELLURIC RESEARCH IN THE EASTERN REGION OF THE HE-XI CORRIDOR[J].Chinese Journal of Geophysics,1984,27(2):131-143. |
| |
| Authors: | LIN CHANG-YOU ZHANG YUN-LIN SHI YU-LAN JIAN MEI LI ZHU-GUO |
| |
| Affiliation: | The Lanzhou Seismology Institute, State Seismological Bureau |
| |
| Abstract: | This paper gives the magnetotelluric sounding results in the eastern region of the He-Xi Corridor. It was discovered that the conductivity distribution of the earth's crust and upper mantle in the direction across the Corridor undergoes major lateral changed and shows some zonal characteristic. There is an anomalous low resistivity layer in the lower earth's crust in the Basins of the Corridor. Its depth is between 45 km and 50 km. Its resistivity is a few ohm-m and its thickness is less than 5 km. This layer is interpreted as containing partial melting in it. To interpret the partial melting in the layer, we considered H2O and CO2 activity in the earth's crust and upper mantle under the specific condition in the measured region. On the basis of the magnetotelluric sounding results in the West-Northern Region of China, a low resistivity layer of limited thickness in the upper mantle was revealed. This fact indicates that the layer is probably the top layer of the asthenos-phere. Probably, the diminution of the bluk resistivity in the layer is caused by the high melting rate, the H2O-rich and the rich carbonates in the melt. Under these conditions the viscosity of the layer is diminished. The paper has also discussed the changes of the depth of the first low resistivity layer in the upper mantle across both northeastern and eastern edges of the Qin-Zhuang Plateau. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
|
点击此处可从《地球物理学报》下载全文 |
|
