3D characteristics of primary halo and deep prospecting prediction in the Zaozigou gold deposit, Hezuo City, Gansu Province
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摘要:
为了评价早子沟金矿深部找矿潜力和找矿方向，以早子沟金矿61个钻孔为研究对象，对矿体出露较厚大的70勘查线原生晕数据进行多元统计分析和三维空间分布特征研究。研究表明：①相关分析和聚类分析结果反映，与主成矿元素Au相关性最密切的元素为As、Ag；②原生晕的形态特征和空间分布特征显示，矿体原生晕发育，且分带明显，矿床的前缘晕元素为As、Sb、Hg，近矿晕元素为Au、Ag、Cu、Pb、Zn，尾晕元素为W、Mo、Bi；③对原生晕数据进行三维插值分析，构建了早子沟金矿各元素原生晕三维模型。Au、As、Sb、Ag等指示元素和As+Sb/Au+Ag元素异常累加比值的异常模型显示，在2500 m以浅，异常规模较小；在2500 m以深，异常规模呈现出向深部越来越大，且延伸稳定。结合异常元素的空间分布特征，提出早子沟金矿78~85勘查线2000 m以深仍有较大的找矿潜力。
Abstract:In order to evaluate the prospecting potential and direction in the depth of the Zaozigou gold deposit, the authors selected 61 drill holes in the Zaozigou gold deposit as the research objects, conducted multivariate statistical analysis and 3D spatial distribution characteristics study of the primary halo data along No.70 exploration line with thick orebodies exposed.The results are as follows:① Correlation analysis and cluster analysis indicate that the elements most closely related to Au are As and Ag.② The morphological characteristics and spatial distribution characteristics of the primary halo show that the ore- and halos- forming elements exhibit a clear zonation.The primary halo is characterized by the front halo elements of As, Sb, Hg, the near-ore halo elements of Au, Ag, Cu, Pb, Zn and the rear halo elements of W, Mo, Bi.③ Based on the 3D interpolation analysis of the primary halo data, a 3D model of each element primary halo in the Zaozigou gold deposit was constructed.The anomaly model of indicator elements such as Au, As, Ag and the anomaly accumulation ratio of As+Sb/Au+Ag show that the anomaly scale is small when the anomaly is shallower than 2500 meters.In the depths greater then 2500 meters, the anomaly scale seems to be larger and larger toward the depth, and the extension is stable.Combined with the spatial distribution characteristics of anomaly elements, it is proposed that the place along No.78 line-No.85 exploration line of the Zaozigou gold deposit still has great prospecting potential in the depths greater than 2000 m.
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Key words:
- deep prospecting prediction /
- 3D visualization /
- primary halo /
- Zaozigou gold deposit /
- Gansu Province
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表 1 早子沟金矿钻孔原生晕数据参数统计
Table 1. Data parameter statistics table of drilling primary halo in the Zaozigou gold deposit
元素 最小值 最大值 几何平
均值算术平
均值中位数 标准
离差浓集
系数变异
系数Au 1.80 24900 49.4 249.40 45.20 1097.40 293.47 4.40 As 1.10 12322.9 206.7 695.50 180.10 1417.30 158.07 2.04 Sb 1.98 93471.8 49.83 775.81 41.49 6112.53 2281.80 7.88 Hg 4.00 94931.0 37.00 209.00 31.00 3785.00 17.38 18.15 Cu 1.70 121.2 18.90 23.50 17.40 17.50 1.38 0.74 Pb 1.90 381.8 23.60 28.50 22.30 25.40 1.5 0.89 Zn 22.50 307.1 77.30 82.00 86.20 27.30 1.21 0.33 Co 1.90 54.9 14.30 15.90 16.70 6.20 1.59 0.39 Ag 0.045 2.86 0.107 0.151 0.09 0.255 2.52 1.69 Bi 0.08 203.92 0.61 1.64 0.51 8.94 9.1 5.45 W 0.18 1639.75 6.79 17.01 6.73 87.04 17.54 5.12 Mo 0.16 304.05 1.27 4.02 0.89 14.19 6.48 3.53 注：浓集系数为算术平均值与丰度值[33]的比值，变异系数为标准离差与算术平均值的比值。Au、Hg元素单位为10-9，其余元素为10-6 
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表 2 早子沟金矿70勘查线原生晕样品正交旋转载荷矩阵
Table 2. Orthogonal rotational load matrix of primary halo samples in No.70 exploration line from the Zaozigou gold deposit
因子 F1 F2 F3 F4 F5 Au 0.460 0.086 -0.036 -0.170 0.068 As 0.799 -0.096 -0.056 -0.062 0.016 Sb 0.567 -0.088 0.078 0.540 -0.280 Hg -0.006 -0.087 0.001 0.442 0.878 Cu 0.274 0.761 -0.044 -0.035 0.170 Pb -0.026 -0.02 0.778 -0.032 -0.051 Zn -0.145 0.784 0.161 -0.053 -0.027 Co -0.401 0.298 0.213 0.548 -0.128 Ag 0.823 0.137 0.156 0.238 -0.025 Bi 0.049 0.026 0.571 0.126 -0.052 W 0.128 -0.112 0.497 -0.476 0.293 Mo -0.064 -0.469 0.302 -0.022 -0.030 主因子方差 2.128 1.566 1.376 1.124 0.993 累积方差贡献/% 17.840 31.078 42.493 51.612 60.886
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表 3 早子沟金矿各元素临界值
Table 3. The critical value of elements in the Zaozigou gold deposit
元素 Au As Sb Hg Ag Co Cu Pb Zn W Mo Bi 插值 0.12 800 130 0.08 0.18 20 48 30 100 25 2.8 1.2
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