Application of Multi-polarized Magnetotelluric Method in the Exploration of Buried Manganese Ore Bodies: A Case Study of Chenjialun area, Anhua County, Hunan Province
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摘要:
多极化大地电磁法分辨率高、抗干扰能力强、对薄层地质体的识别效果较好。湘中地区“桃江式”锰矿床是当前锰矿勘查与研究的热点，该类矿床矿层较薄、埋藏较深，为多极化大地电磁法在锰矿勘探上的运用提供了良好的研究对象。本文以湖南省安化县谌家仑地区为例，采用多极化大地电磁法对谌家仑地区的浅层电磁结构进行探测，旨在识别奥陶系烟溪组含锰地层与围岩的界线，推测隐伏锰矿体的深部延伸情况。结果表明，谌家仑地区奥陶系烟溪组含锰矿层表现为低阻高磁特征。经钻孔验证，在深部259.75 m处揭露了隐伏锰矿体，见矿深度、钻孔测井曲线与多极化大地电磁反演结果基本一致。该结果验证了多极化大地电磁法在谌家仑地区隐伏锰矿体勘查中的可行性和有效性，为该地区锰矿找矿工作提供了参考。
Abstract:The multi-polarized magnetotelluric method has high resolution, strong anti-interference capability, and performs well in identifying thin-layer geological bodies. The "Taojiang-type" manganese deposits in the central Hunan region are a current hotspot for manganese exploration and research. These deposits, characterized by thin ore layers and deep burial, have been well researched for the application of the multi-polarized magnetotelluric method in manganese exploration. In this paper, the multi-polarized magnetotelluric method is used to detect the shallow electromagnetic structure in Chenjialun area, Anhua County, aiming at identifying the boundary between the manganese-bearing strata of the Ordovician Yanxi Formation and the surrounding rocks, and inferring the deep extension of the buried manganese ore body. The results show that the manganese bearing deposits of the Ordovician Yanxi Formation in the Chenjialun area are characterized by low resistivity and high magnetism. The buried manganese ore body was discovered at a depth of 259.75 m through drilling verification. The depth of the ore body and the well logging curves are basically consistent with the output of the multi-polarized magnetotelluric inversion. The results verify the feasibility and effectiveness of the multi-polarized magnetotelluric method in the exploration of buried manganese ore bodies in Chenjialun area, and provide a reference for manganese ore prospecting in this area.
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表 1 谌家仑地区岩、矿石标本电阻率及磁化率测试结果统计表
Table 1. Statistics of resistivity and magnetic susceptibility test results of rock and ore samples in Chenjialun area
地层 岩性 块数 电阻率ρ (Ω·m) 磁化率k（×10−4 SI） 范围 平均值 范围 平均值 两江河组 粉砂岩 20 800～2000 1300 0.01～0.07 0.04 龙马溪组 硅质页岩 9 600～ 1500 950 0.03～0.10 0.06 粉砂质泥岩 8 300～ 1000 650 0.04～0.09 0.06 炭质页岩 9 10～400 220 0.16～0.96 0.45 含锰地层 碳酸锰矿石 12 10～400 170 2.0～21.5 7.5 含锰灰岩 8 100～500 350 1.5～14.0 4.5 桥亭子组 粉砂质泥岩 20 500～ 1700 1100 0.02～0.07 0.05 
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