Deep occurrence characteristics of the Malugou fault zone in the Xicha section of the Longshoushan metallogenic belt determined based on AMT
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摘要: 为减少铀矿钻探工程风险,基于音频大地电磁法(AMT)资料,对龙首山成矿带中的马路沟断裂及次级断裂的深部发育特征进行了探究。通过对马路沟断裂与次级断裂正演理论模型响应特征分析,论证了方法的可行性,在此基础上,结合地质、岩石电性参数和钻探资料,对反演电阻率断面进行了推断解释,大致查明了区内断裂的深部发育特征。研究结果表明:马路沟断裂(F101)走向NW,倾角约80°,其中X501—X502剖面之间倾向NE,X502—X506剖面倾向SW;次级断裂F102、F103走向NW,均倾向NE,倾角75°~80°;上述断裂具有切割深度大、倾角较陡特征。该结果为后期钻探工程的布置提供了依据,提升了铀矿地质勘查的效果与效益。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.
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Key words:
- AMT /
- fault /
- Longshoushan metallogenic belt /
- deep structure
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