华北中部岩石圈电性结构——应县—商河剖面大地电磁测深研究

魏文博; 谭捍东; 金胜; 邓明; 叶高峰; 邓靖武; 万战生

Volume 27 Issue 5

Sep. 2002

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Article Navigation > Earth Science > 2002 > 27(5): 645-650

WEI Wen-bo, TAN Han-dong, JIN Sheng, DENG Ming, YE Gao-feng, DENG Jing-wu, WAN Zhan-sheng, 2002. Conductivity Structure of Lithosphere in Central North China: Magnetotelluric Study of Yingxian-Shanghe profile. Earth Science, 27(5): 645-650.

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Conductivity Structure of Lithosphere in Central North China: Magnetotelluric Study of Yingxian-Shanghe profile

Department of Geophysics, China University of Geosciences, Beijing 100083, China

Received Date: 2002-07-29
Publish Date: 2002-09-25

Abstract

Abstract

In 2001, an MT sounding profile was relocated from Yingxian, Shanxi Province to Shanghe, Shandong Province. The advanced MT data processing method and rapid release inversion (RRI) were employed to establish a 2D model of conductivity structure showing fully the features of conductivity structure of the lithosphere in North China. In terms of conductivity, the North China lithosphere is classified as eastern and western parts with the frontal fault in the Taihang mountain as the corresponding boundary line. The eastern part is characterized by the low resistance conductivity, and the western part is characterized by the high resistance conductivity. In the eastern part, the conductivity structure in the upper crust corresponds roughly to the uplift and depression tectonic structure of the North China rift system, with the maximum conductivity of the lithosphere reaching 3×10⁴ S, far greater than that of magma arc area in Andes and the lithosphere of the Tibet plateau where the volcanic activities are violent. Here, discontinuous highly conductive bodies, whose conductivity is about 0.1-0.8 S/m, are present in the crust of the contact zone. In the western part, the lithosphere of the Taihang and Hengshan mountains, composed of high resistance conductivity bodies, is characterized by the conductivity structure of a stable continental lithosphere. However, a group of westward inclined highly conductive layers, whose conductivity is 0.04-0.25 S/m, whose top layer is located at the depth of 20 km and whose bottom layer is located at the depth of around 40 km, were discovered under the Hengshan high resistance conductivity body
- North China,
- magnetotelluric,
- lithosphere,
- conductivity structure

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References(8)

References

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