银川盆地南部灵武凹陷基底构造特征

doi:10.11720/wtyht.2022.1314

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Abstract

The Lingwu depression,located in the southeastern part of the Yinchuan Faulted Basin,has a complex geological tectonic framework and serves as the turning and intersection part of structures due to the two Himalayan tectonic stresses,namely the EW-direction tensile stress of the Ordos block and the NE-direction compressive stress of the Qinghai-Tibet Plateau. Since 1970, more than 3000 earthquakes with magnitudes of greater than 2.0 have been monitored in the Yinchuan Basin and its periphery. Among them, most of the small and moderately strong earthquakes occurred in the Lingwu depression, which, therefore, has serious hidden risks of earthquake disasters. Previous studies indicate that fault structures are the cause for the earthquakes and that strata serve as the main reason for the earthquake secondary disasters in this depression. To interpret the geological structures in the basement of the Lingwu depression, this study finely characterized the basement characteristics of the Lingwu depression using the 2.5D human-computer interactive inversion technology based on the 1∶50,000 regional gravity data and the constraints of data on drill holes, seismic profiles, magnetotelluric sounding, and controlled source audio-frequency magnetotellurics (CSAMT) profiles, thus providing a basis for the prevention and control of earthquake disasters.

Key words： Lingwu depression 1∶50,000 gravity 2.5D human-computer interactive inversion basement structure

Received: 11 June 2021 Published: 17 August 2022

ZTFLH:

P631

Corresponding Authors: HU Xin-Jun E-mail: 825785150@qq.com;junyan_home@126.com

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	Articles by authors
	Xiao-Jing CHEN
	Xin-Jun HU
	Ya-Dong BAI
	WU-Yang
	Tao-Tao CHEN
	Yuan-Yuan CAO
	NI-Ping

Cite this article:

Xiao-Jing CHEN,Xin-Jun HU,Ya-Dong BAI, et al. Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 862-867.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1314 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/862

Geological structure of the study area

Density layer division table of the study area

The layering of the electrical structure of the crust and mantle in Yinchuan Graben

Remaining gravity anomaly map and 2.5D inversion profile position of Lingwu depression

Depth map of basal top surface in Lingwu depression

2.5D inversion process of the northern L1 profile
a—inversion resistivity profile of CSAMT;b—2.5D inversion result

2.5D inversion process of the central L2 profile
a—inversion resistivity profile of CSAMT;b—2.5D inversion result

2.5D inversion process of the southern L3 profile
a—inversion resistivity profile of CSAMT;b—2.5D inversion result

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