内蒙古额济纳旗东北部雅干断裂带深部构造特征分析——来自大地电磁的证据

doi:10.11720/wtyht.2024.1478

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Abstract

There exists a continued debate concerning the spatial distribution and deep structural characteristics of the Yagan fault zone in northeastern Ejina Banner, Inner Mongolia. Adhering to the known-to-unknown research approach, this study completed five magnetotelluric sounding (MT) profiles. First, it delved into the relationship between the electrical structure characteristics of a MT profile (MT01) on the west side of the study area and the geological structure information of the Yagan fault zone within the profile. In terms of electrical characteristics, the Yagan fault zone was determined as a resistivity gradient zone characterized by northward dip, high dip angles, and deep depths. Based on these characteristics, and combined with the inversion interpretation results of four MT profiles (MT02~MT05) on the east side, this study identified the deep positions and structural characteristics of the Yagan fault zone within all the MT profiles. Moreover, it determined the major electrical directions of all the MT profiles using the impedance tensor decomposition technique, and the spatial trend of the Yagan fault zone based on the two-dimensional inversion interpretation results. As revealed by the results, the Yagan fault zone within the study area exhibits an overall nearly EW strike at the shallow surface and a strike of NE45° in the deep part, with an average width of approximately 6.8 km. It is a reverse fault with a gradual arc deflection to the north from west to east, manifesting a generally northward dip direction, dip angles ranging from 60° to 67°, and a fault depth of about 20 km. The obtained deep electrical structure model effectively reveals the deep structural characteristics of the study area. providing certain reference significance for the study of regional tectonic evolution

Key words： Ejina Banner Yagan fault zone magnetotelluric sounding (MT) electrical structure characteristics

Received: 10 November 2023 Published: 27 June 2024

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	Articles by authors
	Wen-Jie WANG
	Lei CHEN
	Cong-Cong LEI
	Xiao-Feng SHI
	Biao YANG
	Wen-Bao WANG
	Da-Peng SUN
	Hao-Qing XU

Cite this article:

Wen-Jie WANG,Lei CHEN,Cong-Cong LEI, et al. Deep structural characteristics of the Yagan fault zone in northeastern Ejina Banner, Inner Mongolia: Evidence from magnetotelluric sounding[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 640-650.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1478 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/640

Geotectonic location and geological and structural schematic map of the study area
a—geotectonic location of the study area; b—schematic map of geological structure of the study area

Statistical result of conductivity properties of rock in research area

Resistivity characteristics of various rocks in the research area
a—apparent resistivity characteristics of formation rock; b—apparent resistivity characteristics of intrusive rocks

Location of magnetotelluric sounding profiles in the research area

Observation curve of typical magnetotelluric station
a—magnetotelluric observation curve of magmatic rock mass on the northwest side of the survey area; b—magnetotelluric observation curve of Central Basin area

The skewness of MT01~MT05 profiles using phase tensor decomposition technique

Rose diagrams of strike analysis results

Photos of Yagan fault (a1)、(a2) and 2D inversion results of MT01 (b)

2D inversion results of MT02-MT05 profile

Summary of structural characteristics of the inferred Yagan fault zone

The 2D electrical structure characteristics an inferred strike of Yagan fault zone on shallow surface
a—the electrical structure of the Yagan fault zone (3D display); b—inferred strike of Yagan fault zone on shallow surface

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