Application of EH4 in deep concealed rock (ore) body detection: A case study of the Donglufang copper-molybdenum polymetallic deposit, Shangri-la, China
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摘要: 采用音频大地电磁测深（EH4）对东炉房铜钼多金属矿区深部地质构造进行探测分析，有效确定了矿区地下的空间电性和结构特征。通过构建音频大地电磁法（EH4）找矿标志，总结了EH4剖面视电阻率异常特征与矿体关系：浅部呈脉状或柱状低阻体对应中低温热液型金、铅、锌多金属矿体，呈柱状中阻体或中低阻体对应矽卡岩型或斑岩型铜钼多金属矿体，中阻体对应中酸性岩浆岩（玢岩、斑岩）。圈定了矿区深部隐伏矿体11处，其中5处与钻孔吻合，其余6处找矿前景良好；进一步推断在深部岩体中形成规模较大的斑岩型铜钼矿。研究表明音频大地电磁测深法针对东炉房铜钼多金属矿或者该类型矿床寻找隐伏岩（矿）体是有效的地球物理方法。Abstract: This study uses the method of Audio-frequency magnetotelluric sounding (EH4) to detect and analyze the deep geological structure in the Donglifang mining area. The underground spatial electricity and structural characteristics were effectively determined. We built an EH4-based indicator system for localizing ore bodies and summarized the relationship between the apparent resistivity anomalies and the ore bodies in the EH4 profile. The shallow veined or columnar low-resistance bodies may correspond to the low–medium temperature hydrothermal gold, lead, and zinc polymetallic ore bodies; the columnar medium-resistance or medium–low resistance bodies correspond to the silica or porphyry copper–molybdenum polymetallic ore bodies; the medium-resistance bodies correspond to the medium acidic magmatic rocks (porphyrites and porphyries). We identified eleven concealed ore bodies in the deep of the mine area, five of which are consistent with the drill holes, and the remaining six have an excellent prospect of finding ore bodies. It is further inferred that larger-scale porphyry copper–molybdenum ore bodies are formed in the deep rock body. This study proves that the EH4 is an effective geophysical method for finding concealed rock (ore) bodies in the Dongxuofang copper-molybdenum polymetallic mine or this type of deposit.
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图 1 东炉房铜钼多金属矿区地质图
a—矿区位置图；b—矿区地质图
Figure 1. Geological map of the Donglufang copper–molybdenum polymetallic mining area
(a) Location sketch map of the mining area; (b) Geological map of the mining area
图 2 围岩与矿石、矿化岩石电阻率箱线图
a—大理岩；b—灰岩；c—冰碛砂砾；d—石英闪长玢岩/石英二长斑岩；e—黄铜矿化矽卡岩；f—铅锌矿；g—含金褐铁矿、赤铁矿；n—样品数
Figure 2. Boxplot of resistivity of surrounding rock, ore, and mineralized rock
a–marble; b–limestone; c–moraine grit; d–quartz diorite porphyrite/beschtauite; e–chalcopyrite skarn; f–lead–zinc ore; g–gold-bearing limonite and hematite; n–number of samples
图 3 EH4 资料处理流程图（Li et al., 2021）
Figure 3. Flow chart of the EH4 data processing (Li et al., 2021)
图 5 7线视电阻率及相位−频率测深拟断面图
a—视电阻率−频率测深拟断面图；b—相位−频率测深拟断面图
Figure 5. Pseudo-section maps of the apparent resistivity–frequency and phase–frequency soundings of Line 7
(a) Pseudo-section map of the apparent resistivity–frequency sounding ; (b) Pseudo-section map of the phase–frequency sounding
图 6 15线视电阻率及相位−频率测深拟断面图
a—视电阻率−频率测深拟断面图；b—相位−频率测深拟断面图
Figure 6. Pseudo-section maps of the apparent resistivity–frequency and phase–frequency soundings of Line 15
(a) Pseudo-section map of the apparent resistivity–frequency sounding ; (b) Pseudo-section map of the phase–frequency sounding
图 7 东炉房铜钼多金属矿床成矿多样性模式图（据段召艳等，2021修改）
Figure 7. Metallogenic diversity pattern of the Donglufang copper–molybdenum polymetallic deposit（modified from Duan et al.，2021）
图 8 7线物探综合剖面图
a—EH4剖面反演结果图；b—地质及物探推断断面图
Figure 8. Comprehensive geophysical profile of Line 7
(a) Profile inversion results by the EH4 method; (b) Sectional map inferred by the geological and geophysical explorations
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