Deep occurrence characteristics of the Malugou fault zone in the Xicha section of the Longshoushan metallogenic belt determined based on AMT
WU Xu-Liang1,2,3(), LI Mao1,2,3()
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, China 2. CNNC Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource, Shijiazhuang 050002, China 3. Hebei Province Aviation Detection and Remote Sensing Technology Key Laboratory, Shijiazhuang 050002, China
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.
吴旭亮, 李茂. 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[J]. 物探与化探, 2022, 46(5): 1180-1186.
WU Xu-Liang, LI Mao. Deep occurrence characteristics of the Malugou fault zone in the Xicha section of the Longshoushan metallogenic belt determined based on AMT. Geophysical and Geochemical Exploration, 2022, 46(5): 1180-1186.
Zhao R Y, Wang G, Chen Y J, et al. Investigation and evaluation report on uranium resources in Longshoushan metallogenic belt, Gansu Province[R]. Xianyang:203 Institute of Nuclear Industry, 2014.
Song Z T, Zhang L X, Guan S B, et al. The discussion of uranium mineralization regularity of Longshoushan metallogenic belt and its relationship with geological tectonic movement and crustal evolution[J]. Mineral Resources and Geology, 2018, 32(5): 792-793.
Zhao R Y, Wang G, Chen Y J, et al. Investigation and evaluation report on uranium resources in Xicha-Changling west area of Longshoushan metallogenic belt, Gansu Province[R]. Xianyang:203 Institute of Nuclear Industry, 2015.
An G B, Xin C L, Yang T, et al. Geotectonic evolution of Longshoushan metallogenic belt in gansu and its control function on uranium[J]. Journal of Earth Sciences and Environment, 2016, 38(6): 804-805.
Chen Y J, Zhao R Y. Discovery and genesis of cryptoexplosive breccia in Jiling uranium deposit,Longshoushan area,Gansu Province[J]. Geologic Survey, 2012, 48(6): 1101-1108.
Jia H, Rong X, et al. Pre-investigation report on uranium deposits in Jiling-Niujiaogou west area of Longshoushan metallogenic belt,Gansu Province[R]. Xianyang:203 Institute of Nuclear Industry, 2017.
Wang H B, Wang Z H, Chen Z C, et al. Geophysical survey report of Xiaoqingyang-Baijiji rrea in Longshou mountain, Gansu Province[R]. Shijiazguang: Nuclear Industry Aerial Survey Remote Sensing Center, 2013.
Li M, Chen Z C, Wu Y, et al. Geophysical survey report of Huoshiling-Xinshuijing area in Longshou mountain, Gansu Province[R]. Shijiazguang: Nuclear Industry Aerial Survey Remote Sensing Center, 2014.
Liu B, Song Z T, Li X, et al. Geoelectrical characteristics of Geminggou fracture in northern Jiling mass[J]. Geophysical and Geochemical Exploration, 2016, 40(5): 877-878.
Song Z T, Qi C, Han D Y. Study on geological and geophysical characteristics of uranium deposits in Jiling area[J]. Geophysical and Geochemical Exploration, 2018, 42(5): 910-911.
Li M, Song Z T, Chen Z C, et al. Geophysical survey report of Xichag section of Longshou mountain metallogenic belt, Gansu Province[R]. Shijiazguang: Nuclear Industry Aerial Survey Remote Sensing Center, 2015.
Gao X, Li M, Niu Y. Dccurrence and deep extension characteristics of Malugou fault in Gaolingzijing section[J]. Deposit and Geology, 2018, 32(3): 521-522.