A study of mineralization of Wutai gold deposits in Shanxi Province based on the weight of evi-dence-singularity-gray theory
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摘要:
山西五台地区位于华北陆台中部，是山西省内重要的金矿成矿区域，地质条件复杂，近年来找矿突破较小。在矿产预测中，可以结合证据权快速筛选地质变量，求取权重，计算地质奇异性指数，提取局部地质弱异常；利用灰色理论只需少量信息进行预测的特点，圈定找矿靶区，寻找突破。应用证据权-奇异性-灰色理论方法圈定了研究区预测靶区，靶区内通过已知矿床的验证，提取了4个一级靶区，1个二级靶区，确定了该区域金矿找矿突破口，明确了证据权-奇异性-灰色理论关联分析预测法在矿产预测评价中的重要应用价值和独特的应用效果。
Abstract:Located in the central part of North China Craton, Wutai area is an important area of gold mineralization in Shanxi Prov-ince; nevertheless, complex geological settings of this area lead to rare recent prospecting breakthroughs. In mineral prediction, the geological evidence weight approach can rapidly screen geological variables to calculate weights and anomaly index and extract local weak geological anomalies, whereas the gray theory approach can delineate prospecting targets by using only a small amount of infor-mation. These methods can be jointly utilized to look for a breakthrough. In delineating the prognostic target areas based on verified known deposits, four primary targets and a secondary target in Wutai area were delineated. This Weight-Anomaly-Gray Theory conjoint analysis is believed to be an important application in mineral prediction with unique application effect.
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Key words:
- Wutai /
- gold deposit /
- nonlinear /
- gray theory /
- singularity /
- metallogenic prediction
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表 1 五台地区证据因子权重
Table 1. Weight of evidence factor in Wutai area
变量名称 W+ W- 含矿地层面积百分比 2.357 -0.311 控（容）矿侵入岩缓冲区 2.613 -0.315 断裂构造密度 0.674 -0.481 化探Au元素异常 2.810 -0.369 化探Ag元素异常 0.190 -0.148 化探Pb元素异常 0.145 -0.142 
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表 2 研究区已知矿点处的奇异指数无量纲化值比较数列矩阵
Table 2. The singular index study area deposits at the dimensionless value of comparative sequence matrix
矿点
序号Ar
地层侵入岩
缓冲区断裂
密度Au
化探异常Ag
化探异常Pb
化探异常1 1.0000 0.9816 0.3632 0.0193 0.0762 0.3237 2 1.0000 0.9185 0.3734 0.0197 0.0785 0.2989 3 1.0000 0.9816 0.3813 0.0190 0.0942 0.3768 4 1.0000 0.965 0.3135 0.0163 0.0832 0.3514 5 1.0000 0.885 0.3615 0.0162 0.0781 0.3916 6 1.0000 0.8676 0.3108 0.0106 0.0719 0.3329 7 1.0000 0.9724 0.3470 0.0197 0.0374 0.3984 8 1.0000 0.9476 0.3462 0.0108 0.0714 0.3469 9 1.0000 0.9576 0.3068 0.0087 0.076 0.3624 10 1.0000 0.9740 0.2998 0.0069 0.0744 0.3205 11 1.0000 0.9855 0.3249 0.0128 0.066 0.3217 12 1.0000 0.9316 0.3517 0.0051 0.0771 0.3022 13 1.0000 0.9362 0.3224 0.0086 0.0771 0.3323 14 1.0000 0.9240 0.3415 0.0069 0.0819 0.3412 均值 1.0000 0.9449 0.3389 0.0129 0.0745 0.3429 权重 2.3570 2.6130 0.6740 2.8100 0.1900 0.1450 权重后值 2.3570 2.4689 0.2284 0.0363 0.0142 0.0497
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