基于AMT的龙首山成矿带西岔地段马路沟断裂带深部发育特征

doi:10.11720/wtyht.2022.1602

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Abstract

This study explored the deep occurrence characteristics of the Malugou fault and its secondary faults in the study area based on the data obtained using audio-frequency magnetotellurics (AMT), aiming to provide a basis for the drilling layout and improve the effects and benefits of the geological exploration of uranium deposits. The feasibility of the AMT method was demonstrated by analyzing the response characteristics of the forward theoretical model of the Malugou fault and its secondary faults. Based on this, this study deduced and interpreted the inverted resistivity cross-sections by combining geological setting, the electrical parameters of rocks, and the drilling data collected. As a result, the deep development characteristics of faults in the study area were roughly identified, and the details are as follows. The Malugou fault (F₁₀₁) has an NW strike, a dip angle of approximately 80°, and dip directions of NE and SW along sections X501-X502 and sections X502-X506, respectively. Secondary faults F₁₀₂ and F₁₀₃ have an NW strike, a dip direction of NE, and a dip angle of 75°~80°. The above-mentioned faults are characterized by large cutting depths and high dip angles.

Key words： AMT fault Longshoushan metallogenic belt deep structure

Received: 10 November 2021 Published: 03 January 2023

ZTFLH:

P631

Corresponding Authors: LI Mao E-mail: Xuliang16@126.com;lm703@126.com

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	Xu-Liang WU
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Cite this article:

Xu-Liang WU,Mao LI. Deep occurrence characteristics of the Malugou fault zone in the Xicha section of the Longshoushan metallogenic belt determined based on AMT[J]. Geophysical and Geochemical Exploration, 2022, 46(5): 1180-1186.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1602 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I5/1180

Geological map and layout of physical detection lines of study area

地层	岩性	电阻率/(Ω·m)
地层	岩性	范围	常见值
P $t 12$ t	板岩	117.7~1132.5	257
P $t 12$ t	大理岩	426.5~2357.3	1520
$γ 3 3 - 1$ 、 $γ 3 3 - 3$	中粗粒、中细粒花岗岩	236.2~1612.7(完整性较好)	682
$γ 3 3 - 1$ 、 $γ 3 3 - 3$	中粗粒、中细粒花岗岩	100.6~474.2(完整性较差)	291
$γ 3 3 - 2$	中粗粒斑状花岗岩	378.2~1283.5	833
$δ 3 1 - 2$	中细粒闪长岩	330.5~1220.6	1140

Statistics table of rocks resistivity parameters in the study area

Response characteristic diagram of forward modeling theory modle of known geological body

X501 geoelectric characteristic map of typical section

X503 section inversion resistivity geological interpretation section and exploration geological section comparison chart

X506 sevtion inversion resistivity geological interpretation section

Spatial distribution characteristics of Malugou fault and secondary fault in the study area

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