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Geophysical prospecting mode and metallogenic model of the Weiquan silver-copper polymetallic deposit in Xinjiang |
Feng Jun1( ), Jiang Wen1( ), Zhang Zheng2 |
1. Geological Survey of Gansu Province, Lanzhou 730000, China 2. No.1 Regional Geological Team of Xinjiang Bureau of Geo-Exploration & Mineral Development, Changji 838200, China |
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Abstract The Weiquan silver-copper polymetallic deposit has received extensive attention because of its unique genesis. This study analyzed the anomaly characteristics shown in the integrated gravity-magnetic-electrical geophysical planes and sections of the Weiquan silver-copper polymetallic deposit. Then, it obtained the interpretation model of geophysical anomalies through the forward and inverse calculations of the typical sections. Based on the distribution pattern of existing ore bodies and the metallogenic model summarized in previous studies, this study established the geological-geophysical prospecting mode of this area. Moreover, this study proposed the geological-geophysical prospecting model of this area, aiming to provide a basis for prospecting prediction.
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Received: 10 February 2022
Published: 17 August 2022
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Corresponding Authors:
Jiang Wen
E-mail: 429031720@qq.com;jiangwen66@aliyun.com
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Geological and mineral map of the Weiquan area[10]
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岩性 | 块数 | 密度/ (g·cm-3) | 磁化率κ/ (10-6×4πSI) | 极化率/% | 电阻率/(Ω·m) | 平均值 | 变化范围 | 平均值 | 变化范围 | 常见值 | 变化范围 | 常见值 | 变化范围 | 矽卡岩 | 87 | 3.46 | 2.82~3.72 | 3245 | 385~30681 | 7.49 | 0.49~28.40 | 1015 | 71~11990 | 凝灰岩 | 294 | 2.92 | 2.57~3.64 | 3007 | 60~58302 | 6.42 | 0.14~54.08 | 3036 | 31~40667 | 黄铁矿化、闪锌矿、矽卡岩化凝灰岩 | 104 | 3.15 | 2.60~3.95 | 2782 | 80~41304 | 7.85 | 0.71~46.87 | 2356 | 18~17654 | 闪锌矿化、黄铁矿化矽 卡岩 | 75 | 3.45 | 2.66~3.76 | 4541 | 71~28475 | 12.56 | 0.58~45.20 | 533 | 13~4910 | 矽卡岩化凝灰岩 | 75 | 3.15 | 2.67~3.67 | 2833 | 1111~4505 | 7.1 | 0.59~35.50 | 2549 | 110~22450 | 黄铁矿化银铜矿石 | 2 | 3.97 | 3.84~4.09 | 4801 | 4801 | 22.77 | 15.74~29.81 | 49 | 24~73 | 闪长玢岩 | 7 | 2.88 | 2.73~2.96 | 1969 | 1616~2323 | 0.9 | 0.59~1.07 | 566 | 320~996 | 碳酸盐化凝灰岩 | 14 | 2.89 | 2.62~3.24 | 2209 | 967~5885 | 3.45 | 0.73~10.28 | 1495 | 214~2976 | 岩屑砂岩 | 16 | 2.84 | 2.73~3.28 | 1212 | 680~1791 | 4.06 | 0.65~22.38 | 2699 | 192~11153 | 大理岩 | 4 | 2.74 | 2.72~2.76 | 无磁性 | 2.87 | 1.48~5.33 | | |
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Statistical table of physical properties in the Weiquan silver-copper polymetallic deposit
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Plane figure of Bouguer gravity anomalies(a) and aeromagnetic anomalies(b) in the Weiquan area[10]
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Sectional drawing in plane by IP method in central gradient array in the Weiquan area 1—apparent resistivity curve;2—apparent polarizability curve and code of anomaly;3—typical profiles for geophysical prospecting;4—inferred fault;5—copper-silver ore;6—zinc ore occurrence;7—iron ore occurrence;8—copper ore occurrence;9—copper-iron ore occurrence
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Diagram for models and profile anomalies by integrated geophysical prospecting on the Line 0 of the Weiquan mineral area 1—inverse high magnetic body and numbering;2—inverse high polarization body and numbering;3—IP intermediate gradient reflective high resistance tectonic zone;4—silver deposits in drilled holes and lead-zinc mineralizing deposits in drilled holes;5—the position and numbering of drilled holes
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异常体 名称 | 中心位置/m | 宽度/m | 斜深/m | 倾角/(。) | 顶部埋 深/m | 围岩电阻 率/(Ω·m) | 异常体电阻 率/(Ω·m) | 围岩极 化率/% | 异常体极 化率/% | 异常体 属性 | DJ-1 | x=2215 | 430 | 858 | -85 | 102 | 600 | 100 | 4.5 | 10 | 低阻高 极化 | DJ-2 | x=2600 | 320 | 596 | -86 | 119 | 600 | 100 | 3 | 12 | 低阻高 极化 | F1 | x=2420 | 185 | 877 | -88 | 1 | 600 | 50 | 8 | 7 | 低阻高 极化 |
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Table of the result for interpreted model on the Line 0 of the Weiquan mineral area
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异常体 名称 | 中心位置/m | 宽度/m | 斜深/m | 倾角/(°) | 顶部埋 深/m | 围岩电阻 率/(Ω·m) | 异常体电 阻率/(Ω·m) | 围岩极 化率/% | 异常体 极化率/% | 异常体 属性 | DJ-1 | x=355 | 242 | 798 | -79 | 96 | 600 | 50 | 3 | 10 | 低阻高 极化 | DJ-2 | x=515 | 162 | 427 | -74 | 1 | 50 | 600 | 3 | 35 | 高阻高 极化 | DP-1 | x=420 | 10 | 902 | -88 | 7 | 50 | 600 | 5 | 6 | 高阻高 极化 |
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Table of the result for interpreted model on the Line 0 of the Yuebing mineral area
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Diagram for models and profile anomalies by integrated geophysical prospecting on the Line 0 of the Yuebing mineral area 1—gravity inverse highly dense body ; 2—magnetic inverse high magnet and numbering;3—IP intermediate gradient inverse high polarization body and numbering ;4—IP intermediate gradient reflective high resistance tectonic zone(F1);5—TEM reflective tectonic zone(F2);6—silver deposits in drilled holes;7—copper deposits in drilled holes;8—lead-zinc mineralizing deposits in drilled holes;9—the position and numbering of drilled holes
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Correlation diagram of geophysical prospected anomalies in comparison with the geology and geophysics metallogenic model 1—volcanic sedimentary rock;2—volcanic sedimentary rock;3—acidic rock mass in Weiquan;4—iron mineralization;5—lead-zinc mineralization;6—copper-silver mineralization;7—secondary fault structure
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