Application of comprehensive geophysical prospecting in polymetallic ores exploration in Xiaoshan area of Henan Province
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摘要:
河南崤山地区位于豫西金钼铝土矿铅锌多金属成矿带，具有优越的成矿地质条件，但由于第四系和植被覆盖严重，难以开展传统地质填图和化探工作。采用高精度磁法、激电中梯和激电测深综合物探方法，结合钻探验证，查明崤山地区小妹河一带隐伏岩体、地层及构造分布，圈定多金属找矿有利靶区。研究结果表明: 燕山期花岗岩与太华群的接触带是多金属矿成矿的有利部位，而高磁异常+ 高阻高极化组合是识别隐伏花岗岩体的重要标志，花岗岩与安山岩的电性突变带(高阻-低阻过渡区)可能对应热液蚀变或多金属矿化体，高极化异常区与多金属矿化密切相关。综合物探方法为崤山地区的金矿勘查提供了高效、低成本的技术手段，研究成果对该区未来的找矿工作具有指导意义。
Abstract:Xiaoshan area in Henan Province is located in the gold-molybdenum-bauxite lead-zinc polymetallic mineralization belt in the western Henan, with superior geological conditions for mineralization. However, due to the severe Quaternary system and vegetation coverage, it is difficult to carry out traditional geological mapping and geochemical exploration work. By using comprehensive geophysical prospecting method of high-precision magnetic method, induced polarization midale gradient and induced polarization sounding, and combined with drilling verification, the authors identified the distribution of concealed rock masses, strata and structures in Xiaomeihe area of Xiaoshan, and delineated favorable target areas for polymetallic prospecting. The results show that the contact zone between Yanshanian granites and Taihua Group is a favorable location for polymetallic mineralization. The combination of high magnetic anomalies and high resistance and high polarization is an important indicator for identifying concealed granites. The electrical property mutation zone (high resistance-low resistance transition zone) between granites and andesites may correspond to hydrothermal alteration or polymetallic mineralized bodies. The high polarization anomaly zone is closely related to polymetallic mineralization. The comprehensive geophysical prospecting method provides efficient and low-cost technical means for gold exploration in Xiaoshan area. This research could provide references for future mineral exploration in this area.
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表 1 研究区岩石物性参数
Table 1. Physical property parameters of rocks in the study area
岩石类别 视极化率/4π·10-6SI 电阻率/Ω·m 极化率/% 最小值 最大值 平均值 最小值 最大值 平均值 最小值 最大值 平均值 斜长角闪片岩 75 1 048 358 65 907 328 0.63 1.06 0.79 片麻状花岗岩 508 3 351 2 260 563 1 847 1 118 0.91 2.04 1.39 花岗斑岩 65 4 510 1 407 928 4 165 2 161 0.47 1.71 1.3 杏仁状安山岩 16 307 114 340 1 358 639 0.54 0.98 0.77 构造蚀变岩 - - - 32 264 118 1.57 3.55 2.24 注: “-”为无数据。 
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表 2 异常分区及异常体推测解释
Table 2. Explanation of anomaly zoning and anomaly body speculation
磁异常区域 特性 异常值/nT 异常面积/km2 异常体推测 C-01 磁力高 120~500 1.2 花岗斑岩 C-02 磁力高 160~600 0.2 片麻状花岗岩或花岗斑岩 C-03 磁力高 160~800 1.0 片麻状花岗岩或花岗斑岩 C-04 磁力高 120~900 1.0 斜长角闪岩 C-05 无磁异常 0~80 2.8 地表对应的第四系和安山岩
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表 3 断裂构造推断解释
Table 3. Inference and explanation of fault structure
断裂编号 走向 长度/km 级别 F1 NNE向 1.0 一般断裂 F2 NNW向 1.1 一般断裂 F3 NNW向 1.1 一般断裂 F4 NWW向 0.5 一般断裂 F5 NWW向 0.8 一般断裂 F6 NEE向 1.2 一般断裂 F7 NNW向 3.0 较大断裂 F8 NWW向 0.9 一般断裂 F9 NEE向 0.6 一般断裂 F10 NWW向 0.9 一般断裂 F11 NNE向 1.2 一般断裂 F12 NNE向 0.8 一般断裂 F13 NNE向 0.8 一般断裂 F14 NNW向 1.4 一般断裂 F15 NNE向 1.5 较大断裂 F16 NNW向 0.9 一般断裂 F17 NWW向 0.7 一般断裂
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