A STUDY ON ORE PROSPECTING WITH PEDOGEOCHEMISTRY IN SEMI-DESERT AND GOBI AREA——TAKING TABUGE AREA IN ALIXA RIGHT BANNER OF INNER MONGOLIA AS A CASE
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摘要: 内蒙古阿拉善塔布格地区主要地貌形态为荒漠、戈壁和山地,本文基于1:1万土壤地球化学测量工作成果,系统总结了塔布格地区地质特征,并对研究区内元素含量、异常组合和土壤地球化学异常等特征进行研究,结果表明:Au、Ag、Pb异常强度高、规模大,具有明显的浓集中心和浓度分带,多元素异常套合好,且与地质构造对应,异常查证发现含金石英脉,Au、Ag、Pb为主要成矿元素,As、Sb、Bi、Hg、Sn、Cu、Mo、Zn、W为成矿指示元素。综合地质成矿背景及化探异常特征,在区内圈定两处以金为主的多金属找矿靶区,认为后续工作主攻矿种应为金,主攻矿化类型为与韧-脆性构造变形有关的构造热液型金多金属矿化。Abstract: Desert, gobi and mountain are the main topographic features of Tabuge area, Alixa right banner, Inner Mongolia. On the basis of soil geochemical survey at scale of 1:10000 in Tabuge area, the geological characteristics are summarized and characteristics like the elemental content, anomalous assemblage and soil geochemical anomaly are studied in this article. The results suggest that Au, Ag and Pb have high anomaly intensity, large scale, and obvious concentration center and concentration zone.The multi-element anomaly is well fitted, corresponds to geological structure, and the anomaly verification shows that there are gold-bearing quartz veins, with Au, Ag and Pb as the main ore-forming elements and As, Sb, Bi, Hg, Sn, Cu, Mo, Zn, W the ore-forming indicator elements. Considering the geological ore-forming background and characteristics of geochemical anomaly, two gold-based multi-metal prospecting target fields are set up in the area. It is believed that the main mineral to study should be gold, and the main mineralization type should be the gold polymetallic mineralization of structural hydrothermal type which is related to tough-brittle tectonic deformation.
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表 1 塔布格地区土壤微量元素含量统计特征
Table 1. Statistical characteristics of the soil trace element contents in Tabuge area
元素 Cu Pb Zn As Sb Bi Hg W Mo Sn Ag Au 地壳丰度 25.00 14.2 71.00 1.50 0.20 0.10 89.00 2.00 1.50 5.50 0.516 1.42 最大值 171.40 193.20 372.40 76.50 4.81 393.90 677.03 576.00 24.68 41.20 2.03 44.58 最小值 2.00 6.70 14.20 0.79 0.06 0.04 4.44 0.30 0.25 1.00 0.03 0.35 中位数 12.70 20.10 50.90 4.88 0.22 0.17 9.82 1.22 0.83 2.40 0.04 0.81 平均值 15.23 21.54 54.84 5.64 0.24 0.65 11.00 2.14 1.01 2.56 0.05 0.94 标准离差 11.28 8.89 23.31 4.04 0.15 8.06 16.58 11.65 0.88 1.15 0.07 1.40 变异系数 0.74 0.41 0.43 0.72 0.62 12.38 1.51 5.44 0.87 0.45 1.46 1.49 注: Au、Hg的含量单位为10-9, 其他元素的含量单位为10-6。地壳丰度值取自GREM(1998)。 表 2 塔布格地区土壤分析元素地球化学相关矩阵
Table 2. The geochemical correlation matrices of soil analysis elements in Tabuge area
元素 Cu Pb Zn As Sb Bi Hg W Mo Sn Ag* Au* Cu 1.00 Pb* -0.01 1.00 Zn 0.22 -0.06 1.00 As 0.25 -0.14 0.19 1.00 Sb 0.15 -0.04 0.16 0.28 1.00 Bi 0.04 0.07 -0.03 0.09 0.13 1.00 Hg 0.08 0.06 0.01 0.11 0.15 0.60 1.00 W 0.02 -0.02 0.02 0.09 0.01 0.01 0.01 1.00 Mo 0.18 -0.02 0.37 0.35 0.19 0.18 0.37 0.04 1.00 Sn 0.01 0.16 0.18 0.05 0.02 -0.02 0.01 0.53 -0.01 1.00 Ag* 0.27 0.44 0.02 0.03 0.03 0.03 0.05 0.01 0.15 0.03 1.00 Au* 0.10 0.20 0.03 0.14 0.05 0.03 0.04 0.01 0.12 0.01 0.14 1.00 Au*、Ag*、Pb*为主成矿元素 表 3 研究区土壤微量元素R型因子分析
Table 3. R-type factor analysis of soil trace elements in the study area
元素 F1 F2 F3 F4 Cu 0.556 -0.084 0.312 -0.061 Pb -0.261 0.108 0.784 0.129 Zn 0.637 -0.145 0.006 0.140 As 0.694 0.072 -0.043 0.053 Sb 0.505 0.171 -0.036 -0.017 Bi 0.024 0.868 0.026 -0.004 Hg 0.150 0.878 0.040 0.001 W 0.050 0.017 -0.054 0.850 Mo 0.645 0.331 0.117 -0.016 Sn 0.041 -0.023 -0.083 0.883 Ag 0.090 0.004 0.811 -0.014 Au 0.173 0.000 0.462 -0.038 方差贡献/% 19.178 13.324 37.958 11.756 累计方差贡献/% 19.178 32.502 45.460 57.217 表 4 研究区异常下限值
Table 4. The elements anomaly threshold in the study area
元素 Au Ag Pb 理论值 1.9 0.1 30 迭代法 2.1 0.13 32.58 多重分形法 3 0.2 40 注:Au含量单位为10-9, 其余元素为10-6 -
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