Electric Structure of the Crust Beneath the
详细信息
- 责任者：Zhao Guoze (Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Zhan Yan
- 刊名：Seismology and Geology
- 出版年：2010
- 卷期：32(3)
- 关键词：地壳 ; crust ; 电性结构 ; electrical structure ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.345-359
- 图表：7 illus., 56 refs.
- 分类号：0400
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
The Ordos fault block is a stable block since the Cenozoic time.Whether low-resistivity layers exist in the middle and lower crust of this kind block is an open question.This work attempts to reveal the entire crustal structure of the Ordos fault block based on interpretation of magnetotelluric data collected along the profile across this region.The result shows that a layered structure characterizes the crust of the Ordos fault block,with a low-resistivity layer at depth of about 20 km,presumably associated with fluids there.On contrast,in the areas of active tectonics in the east and west of the fault block,there is no such layered electric structure in crust,while the low-resistivity zones may be related with the detachments(or ductile-shear zones) in crust.The difference in electric structure of crust between the Ordos fault block and neighboring areas is of significance to the analysis of activity and deformation in varied blocks.