ROCK GEOCHEMICAL CHARACTERISTICS AND ORE-PROSPECTING PROGNOSIS IN THE BAIMIANSHAN METALLOGENIC FORECASTING AREA, NORTHERN GUANGDONG
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摘要:
通过对大宝山钼多金属矿床西侧白面山成矿预测区野外地质调查, 确定该区断裂构造十分发育, 主要有北西、北东和近东西向3组, 其中北西向断裂形成最早, 北东向最晚。区内有较多中基性岩脉沿北西、北东向断裂侵入。沿断裂带的地表存在多处岩石蚀变和铅锌锑黄铁矿等矿化点。对预测区内围岩(蚀变灰岩)及岩浆岩(石英闪长玢岩、辉绿岩)岩石样品进行等离子体质谱(ICP-MS)测试分析, 从成矿、微量和稀土元素的地球化学特征及与成矿作用之间关系反映出该地区可能具有良好的成矿环境, 结合对该区各类成矿地质条件及前人的物化探研究成果, 确定在其地下不深处存在有成矿地质体, 为预测区成矿提供充足的物质来源。预测白面山中西部地下500~800 m深处可能存在一个具有相当规模的中-低温矽卡岩型铅锌银多金属矿床。
Abstract:According to the Baimianshan metallogenic forecasting area geological investigation to the west of Dabaoshan Mo deposit, we know that this area highly developed fault structures, mainly for the NW, NE and nearly NW three groups, among them, the NW fracture formed in the earliest time while NE the last. Along the NW and NE fault structures, we can see lots of suffer basic rock vein intruded. Following our investigation, we also find that along the fault zone of the surface existing multiple rock alteration and antimony lead-zinc pyrite mineralization points. Based on the test analysis in this area of surrounding rock and magmatic rock samples (ICP-MS), and from mineralization and geochemical characteristics of trace and rare earth elements reflecting the region is likely to have good metallogenic environment, combination of various metallogenic geological conditions and the predecessor's research of geochemical exploration work, we can conclude that there has ore-forming geological body which is not far from underground, and provided sufficient material sources for this region mineralization. Through the metallogenic information in this paper, we predict that between 500~800 meters underground in the mid-west of Baimianshan may be a considerable scale deposit of low temperature skarn type and zinc silver multi-metal.
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表 1 白面山预测区蚀变灰岩微量元素含量(×10-6)
Table 1. Trace elements of the meta-alteration limestone in Baimianshan forecasting area
序号 岩性 Rb Ba Th U Ta Nb La Ce Sr Nd Zr Hf Sm Y Yb Lu Mo Tl Bi Cd Sb W Zr/Hf Nb/Ta B004 中厚层灰黑色灰岩 6.950 17.300 0.565 1.120 0.164 0.540 2.050 4.030 663 1.800 6.130 0.168 0.372 1.870 0.163 0.024 0.166 0.078 0.047 0.206 0.675 1.200 36.488 3.293 B016 厚层状灰黑色灰岩 27.800 333.0 2.360 1.370 0.205 2.330 6.320 12.70 415 5.850 30.70 0.815 1.240 5.620 0.596 0.097 0.418 0.267 0.221 0.317 5.700 0.590 37.669 11.367 B043 厚层状灰白色灰岩 7.690 3488.0 0.762 0.463 0.045 0.514 4.770 9.000 410 3.890 6.820 0.222 0.804 3.730 0.341 0.057 0.248 0.326 1.240 0.791 3.330 0.441 30.721 11.422 B054-2 厚层状灰白色灰岩 17.500 64.2 1.560 0.830 0.122 1.590 3.220 6.630 180 2.960 23.10 0.657 0.634 3.150 0.366 0.061 0.138 0.137 0.095 11.40 3.030 0.670 35.160 13.033 B057-1 灰白色灰岩 14.200 49.5 2.600 1.230 0.162 2.100 8.540 16.70 392 8.200 25.20 0.737 1.710 8.030 0.682 0.107 0.976 0.131 0.134 0.089 2.520 0.303 34.193 12.963 B058 土黄色泥质灰岩 16.100 90.2 2.100 0.513 0.164 1.840 4.800 10.80 250 5.590 13.90 0.395 1.550 8.250 0.644 0.093 0.499 0.133 0.166 0.180 2.890 0.455 35.190 11.220 B077 中厚层灰白色灰岩 8.220 25.1 0.709 1.230 0.039 0.527 3.690 6.470 336 2.520 8.350 0.243 0.474 2.190 0.210 0.039 0.674 0.154 0.076 0.188 1.240 0.271 34.362 13.513 B081 厚层灰白色灰岩 23.400 57.6 1.920 0.997 0.194 2.220 8.960 15.10 488 6.060 27.10 0.794 1.080 4.850 0.496 0.077 1.010 0.216 0.466 0.368 16.20 0.657 34.131 11.443 B0128 中厚层状灰岩 39.900 232.0 2.560 1.010 0.154 2.030 9.970 16.60 151 8.830 26.00 0.783 2.190 10.20 1.060 0.158 0.224 0.269 0.267 0.175 2.810 0.821 33.206 13.182 B0153 厚层状灰白色灰岩 5.210 27.30 0.828 0.705 0.095 1.060 3.550 6.890 531 3.180 18.60 0.483 0.666 3.470 0.305 0.047 0.322 0.093 0.160 27.20 1.840 0.323 38.509 11.158 B0159 中厚层状微晶灰岩 1.780 51.90 0.128 0.273 0.020 0.097 1.540 2.310 466 0.966 1.160 0.036 0.173 0.924 0.062 0.010 0.118 0.047 0.057 2.930 1.080 0.101 32.222 4.850 B0185 方解石化泥晶灰岩 5.920 35.30 0.569 0.942 0.049 0.448 1.720 2.920 527 1.270 5.670 0.157 0.245 1.360 0.130 0.023 0.227 0.105 0.072 1.460 1.140 0.276 36.115 9.143 注：B0153号样品为预测区内石英闪长玢岩岩脉南侧采集的铅锌矿石 
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表 2 白面山预测区岩浆岩中微量元素含量(×10-6)
Table 2. Trace elements of the meta-magmatic rocks in Baimianshan forecasting area
序号 岩性 Rb Ba Th U Ta Nb La Ce Sr Nd Zr Hf Sm Y Yb Lu Mo Tl Bi Cd Sb W Zr/Hf Nb/Ta B020 石英闪长玢岩 35.2 100 3.15 0.802 1.74 26.2 64.8 84.5 24.8 90.3 433 11.8 22.4 103 9.09 1.38 0.681 0.34 0.023 0.656 24.10 1.21 36.695 15.057 B032 石英闪长玢岩 29.3 24.8 1.95 0.423 1.33 19.8 16.3 42.5 89.3 32.5 202 5.88 8.49 48.2 4.3 0.599 0.86 0.257 0.036 0.388 33.70 5.12 34.354 14.887 B0165 辉绿岩 1.95 11.2 0.161 0.639 0.012 0.106 1.61 2.96 516 1.2 1.07 0.033 0.202 0.9 0.072 0.013 0.061 0.031 0.084 0.389 0.708 0.08 32.424 8.833 B0176 辉绿岩 10.8 4608 1.51 1.26 0.062 0.673 10.3 25.6 9.7 12.3 16.4 0.518 3.02 8.11 1.03 0.148 1.21 0.428 0.158 0.604 7.75 0.504 31.660 10.855 注：B0165号辉绿岩样品发育褐铁矿化，B0176号样品氧化成为铁帽
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表 3 白面山预测区蚀变灰岩稀土元素含量(×10-6)
Table 3. REE elements of the meta-alteration limestone in Baimianshan forecasting area
序号 岩性 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu ΣREE LREE HREE LREE/HREE (La/Yb)N δEu δCe B004 中厚层灰黑色灰岩 2.050 4.030 0.456 1.800 0.372 0.072 0.327 0.054 0.324 0.061 0.165 0.030 0.163 0.024 9.928 8.780 1.148 7.648 9.020 0.617 0.980 B016 厚层状灰黑色灰岩 6.320 12.700 1.430 5.850 1.240 0.215 1.010 0.173 1.000 0.195 0.545 0.102 0.596 0.097 31.473 27.755 3.718 7.465 7.610 0.569 0.990 B043 厚层状灰白色灰岩 4.770 9.000 0.968 3.890 0.804 0.284 0.730 0.118 0.727 0.139 0.364 0.065 0.341 0.057 22.257 19.716 2.541 7.759 10.030 1.112 0.970 B054-2 厚层状灰白色灰岩 3.220 6.630 0.760 2.960 0.634 0.124 0.556 0.098 0.607 0.116 0.326 0.063 0.366 0.061 16.521 14.328 2.193 6.533 6.310 0.624 1.000 B057-1 灰白色灰岩 8.540 16.700 2.050 8.200 1.710 0.347 1.440 0.253 1.460 0.286 0.724 0.118 0.682 0.107 42.617 37.547 5.070 7.406 8.980 0.658 0.950 B058 土黄色泥质灰岩 4.800 10.800 1.260 5.590 1.550 0.428 1.290 0.243 1.500 0.272 0.695 0.121 0.644 0.093 29.284 24.428 4.856 5.030 5.350 0.900 1.050 B077 中厚层灰白色灰岩 3.690 6.470 0.669 2.520 0.474 0.090 0.442 0.072 0.411 0.079 0.209 0.037 0.210 0.039 15.412 13.913 1.499 9.282 12.600 0.591 0.940 B081 厚层灰白色灰岩 8.960 15.100 1.650 6.060 1.080 0.234 1.030 0.168 0.942 0.184 0.494 0.088 0.496 0.077 36.563 33.084 3.479 9.510 12.960 0.669 0.890 B0128 中厚层状灰岩 9.970 16.600 2.190 8.830 2.190 0.518 1.860 0.347 2.090 0.395 1.030 0.186 1.060 0.158 47.424 40.298 7.126 5.655 6.750 0.765 0.830 B0153 厚层状灰白色灰岩 3.550 6.890 0.786 3.180 0.666 0.312 0.617 0.106 0.638 0.124 0.317 0.056 0.305 0.047 17.594 15.384 2.210 6.961 8.350 1.463 0.970 B0159 中厚层状微晶灰岩 1.540 2.310 0.244 0.966 0.173 0.041 0.173 0.026 0.147 0.028 0.072 0.012 0.062 0.010 5.804 5.274 0.530 9.951 17.820 0.717 0.830 B0185 方解石化泥晶灰岩 1.720 2.920 0.336 1.270 0.245 0.049 0.251 0.039 0.232 0.046 0.126 0.022 0.130 0.023 7.409 6.540 0.869 7.526 9.490 0.599 0.880 注：B0153号样品为预测区内石英闪长玢岩岩脉南侧采集的铅锌矿石；测试单位为核工业北京地质研究院分析测试研究中心
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表 4 白面山预测区岩浆岩中稀土元素含量(×10-6)
Table 4. REE elements of the meta-magmatic rocks in Baimianshan forecasting area
序号 岩性 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu ΣREE LREE HREE LREE/HREE (La/Yb)N δEu δCe B020 石英闪长玢岩 64.80 84.50 19.00 90.30 22.40 7.54 19.30 3.81 24.00 4.32 10.70 1.740 9.090 1.380 362.880 288.540 74.340 3.881 5.11 1.0819 0.58 B032 石英闪长玢岩 16.30 42.50 6.56 32.50 8.49 3.01 7.36 1.57 11.00 2.04 4.92 0.841 4.300 0.599 141.990 109.360 32.630 3.352 2.72 1.1368 1.01 B0165 辉绿岩 1.610 2.96 0.33 1.20 0.20 0.05 0.19 0.03 0.16 0.03 0.08 0.013 0.072 0.013 6.927 6.345 0.582 10.902 16.04 0.7251 0.95 B0176 辉绿岩 10.30 25.60 3.16 12.30 3.03 0.65 2.08 0.38 2.13 0.38 1.02 0.174 1.030 0.148 62.385 55.041 7.344 7.495 7.17 0.7501 1.09 注：B0165号辉绿岩样品发育褐铁矿化，B0176号样品氧化成为铁帽
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