Soil Geochemical Characteristics and Prospecting Prediction in Sanyu Area, Li County, Gansu Province
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摘要:
三峪地区位于甘肃崖湾–大桥金锑矿带，属于国家级整装勘查内，具有金、锑、铜等多金属成矿条件及找矿潜力。为进一步提高地质找矿工作，在研究区开展了1∶2.5万土壤地球化学测量，以Au、Ag、Cu、Pb、Zn、Ni、Sb、Bi、Hg等9种元素原始数据为基础，运用分形特征及元素的变异系数、浓度系数等方法，对9种元素基础数据进行了统计，并分析了元素空间富集状态及分布趋势。结果显示，Pb、Zn、Sb和Au具有一定的找矿指标，利用SPSS 25对9种元素进行聚类及因子分析，共划分出F1（Ag−Pb−Zn−Sb）、F2（Au−Cu−Ni−Bi）、F3（Hg）3种组合元素，通过衬度异常法得出元素组合异常下限，根据软件Sufer 13对组合元素做出因子得分异常图，共圈定出4个找矿远景区，为下一步开展地质找矿、缩小远景区提供依据。
Abstract:Sanyu area is located in the Yawan−Daqiao gold−antimony ore belt of Gansu Province, which belongs to the national integrated exploration, and has the metallogenic conditions and prospecting potential of gold, antimony, copper and other polymetals. In order to further improve the geological prospecting work, 1∶25000 soil geochemical survey was carried out in the research area. Based on the original data of Au, Ag, Cu, Pb, Zn, Ni, Sb, Bi and Hg elements, fractal characteristics, coefficient of variation, coefficient of concentration and other methods, The basic data of 9 elements were statistically analyzed, and the spatial enrichment status and distribution trend of elements were analyzed. The results showed that Pb, Zn, Sb and Au had certain prospecting indexes, SPSS 25 was used for clustering and factor analysis of 9 elements, and three combination elements were divided into F1 (Ag−Pb−Zn−Sb), F2 (Au−Cu−Ni−Bi) and F3 (Hg). The lower limit of element combination anomaly was obtained by contrast anomaly method, and according to software Sufer. The factor score anomaly map of 13 combination elements was made, and a total of 4 prospecting prospects were delineated, which provided a basis for further geological prospecting and reduction of prospective areas.
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Key words:
- soil geochemistry /
- fractal /
- abnormal combination /
- prospecting prediction /
- Sanyu region
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表 1 甘肃省礼县三峪地区地球化学元素含量参数统计特征表
Table 1. Statistical characteristics of geochemical element content parameters in Sanyu area, Lixian County, Gansu Province
元素 样品数目
（件）最大值 算术
平均值标准
离差变异系数
CV1浓度
系数陇南地区
背景值算术
平均值标准
离差变异系数
CV2Au 1200 6.4 1.6 0.7 0.46 1.01 1.58 1.58 0.61 0.39 Ag 1200 0.23 0.04 0.02 0.44 / 71.14 0.04 0.02 0.39 Cu 1200 65 30.5 5.1 0.17 1.23 24.7 30.24 4.31 0.15 Pb 1200 24 36.8 6 0.16 1.69 21.81 35.75 3.31 0.1 Zn 1200 700 95.1 28.8 0.3 1.29 73.89 90.92 12.56 0.16 Ni 1200 201 46 9.8 0.21 1.52 30.25 44.85 4.82 0.14 Sb 1200 23.11 1.8 0.98 0.55 2.2 0.82 1.57 0.26 0.23 Bi 1200 3.37 0.43 0.16 0.38 1.3 0.33 0.42 0.11 0.29 Hg 1200 21 14 3 0.19 0.52 26.75 14.46 2.74 0.19 注： Au、Ag含量为10−9；其他元素含量为10−6；变异系数=标准离差/平均值；浓度系数=平均值/陇南地区背景值；“/”表示数值低。 
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表 2 KMO和巴特利特检验表
Table 2. KMO and Bartlett test
KMO取样适切性量数 0.655 巴特利特球形度检验 近似卡方 1668.056 自由度 36 显著性 0
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表 3 正交旋转因子载荷矩阵表
Table 3. Orthogonal rotation factor loading matrix
元素 F1 F2 F3 Au 0.052 0.489 0.263 Ag 0.512 −0.111 −0.502 Cu 0.235 0.792 −0.134 Pb 0.852 0.096 −0.015 Zn 0.821 0.119 −0.071 Ni 0.009 0.682 0.15 Sb 0.642 0.106 0.252 Bi 0.02 0.565 −0.273 Hg 0.114 −0.034 0.763 方差贡献率（%） 28.655 22.239 14.902 旋转累计方差贡献率（%） 28.655 50.894 65.796
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表 4 甘肃礼县三峪地区元素组合异常衬值参数统计表
Table 4. Statistics of soil geochemical lining parameters in Sanyu area, Li County, Gansu
元素组合 背景值 标准差 外带值下限 中带值 内带值 F1 4.090 0.586 4.382 4.676 5.262 F2 4.024 0.615 4.332 4.639 5.254 F3 1.000 0.190 1.095 1.190 1.380
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