Enrichment regularity of dispersed elements in Zhugongtang lead-zinc deposit in northwestern Guizhou Province: Geological implication
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摘要:
猪拱塘铅锌矿床为黔西北最近查明的一超大型铅锌矿床.利用电子探针、电感耦合离子质谱等方法分析了猪拱塘铅锌矿床矿石矿物中分散元素的含量及赋存状态, 结果表明矿石中含Ge、Tl、Ga、Cd、In、Se等多种分散元素.这些分散元素可能以类质同象的形式赋存在硫化物矿物中, 表现为Cd、Ga、Se、In等主要富集在闪锌矿中, Tl、Ge主要富集在方铅矿中.通过分析矿床闪锌矿中Cd、Zn/Cd、Ga/In等值, 初步认为猪拱塘铅锌矿床的成因类型可能为"热液沉积改造"型铅锌矿床.
Abstract:The super large Zhugongtang Pb-Zn deposit is recently identified in northwestern Guizhou Province. The content and occurrence of dispersed elements in the ore minerals of the deposit are analyzed by electron probe microanalyzer(EPMA) and inductively coupled plasma mass spectrometry(ICP-MS). The results show that the ores contain multiple dispersed elements including Ge, Tl, Ga, Cd, In and Se, which may occur in sulfide minerals in the form of isomorphism. Specifically, the elements of Cd, Ga, Se and In are mainly enriched in sphalerite, while Tl and Ge mainly in galena. By analyzing the Cd content, Zn/Cd and Ga/In values in sphalerite, it is preliminarily considered that Zhugongtang Pb-Zn deposit may be of hydrothermal sedimentary transformation type genetically.
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Key words:
- lead-zinc deposit /
- dispersed element /
- occurrence state /
- enrichment regularity /
- Guizhou Province
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表 1 矿床主要金属矿物中分散元素电子探针分析平均含量表
Table 1. Average contents of dispersed elements in major metallic minerals by EPMA
样品 Ga Te Ge Re Se Cd Tl In 方铅矿 0.02 0.05 0.03 0.60 0.08 0.02 - - 闪锌矿 - 0.02 0.02 0.05 0.01 0.09 - 0.01 黄铁矿 - 0.02 0.01 0.04 0.02 - - - 含量单位：%. 
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表 2 猪拱塘铅锌矿床原生矿石硫化物分散元素及主成矿元素含量
Table 2. Contents of sulfide dispersed element and major metallogenic elements in primary ores of Zhugongtang Pb-Zn deposit
序号 测试对象 Zn Ga Ge TI Cd In Re Se Pb Fe 1 闪锌矿 537164 84.4 0.162 0.546 825 2.64 0.006 1.82 18726 107730 2 闪锌矿 513742 56.5 0.284 0.524 654 5.72 0.004 2.64 7206 57390 3 闪锌矿 563812 72.6 0.306 2.652 736 4.14 0.002 1.65 6984 409690 4 闪锌矿 482736 224 0.116 0.634 568 6.78 0.001 1.78 26585 48180 5 闪锌矿 478561 167 0.254 0.351 692 0.89 0.007 1.32 18365 65980 6 闪锌矿 549863 48 1.26 0.268 747 7.66 0.006 1.72 8467 233120 7 闪锌矿 567864 70.8 0.132 0.247 669 5.43 0.008 2.61 5968 155930 8 闪锌矿 472545 80.6 0.37 0.163 882 1.82 0.002 2.23 1924 290690 9 闪锌矿 438654 72.4 0.154 0.564 731 10.56 0.003 1.06 3385 93260 10 闪锌矿 536742 86.2 0.286 0.144 618 9.46 0.007 2.66 7791 100110 11 闪锌矿 483654 28.7 0.495 1.78 537 3.88 0.004 1.38 12648 / 12 闪锌矿 526746 179 0.228 0.246 642 2.54 0.006 1.84 5527 / 13 闪锌矿 498653 27 0.201 0.752 721 7.65 0.003 1.79 8064 / 14 方铅矿 4820 0.006 0.562 8.82 15.2 0.267 0.001 - 545006 / 15 方铅矿 3896 0.045 1.364 7.48 13.5 0.362 0.003 - 687324 / 16 方铅矿 4465 0.204 2.18 6.59 5.94 0.486 0.001 - 723536 / 17 方铅矿 5632 0.166 0.786 3.46 6.78 0.575 0.006 - 465782 / 18 方铅矿 3654 0.388 0.625 7.21 8.82 0.831 0.007 - 638924 / 19 方铅矿 658 1.246 2.683 3.64 4.28 0.156 0.005 - 782103 / 20 方铅矿 762 0.082 0.747 5.37 3.75 0.725 0.002 - 547816 / 21 方铅矿 1265 0.363 1.381 7.98 26.48 0.468 0.006 - 663892 / 22 黄铁矿 4620 0.642 1.67 0.524 7.84 0.265 0.005 0.26 629 / 23 黄铁矿 5932 0.598 1.52 0.463 7.69 0.237 0.002 0.48 398 / 24 黄铁矿 4760 0.732 2.36 0.519 5.86 0.374 0.007 0.51 7705 / 25 黄铁矿 6694 0.264 2.51 0.263 3.64 0.179 0.004 - 546 / 26 黄铁矿 8754 1.245 1.78 0.375 5.89 0.164 0.007 - 872 / 27 黄铁矿 4490 0.824 1.02 0.689 9.21 0.385 0.003 - 584 / 注：“一”为未检出，“/”为未检. 含量单位：10－6（质量分数）.
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表 3 猪拱塘铅锌矿床原生矿石硫化物分散元素含量及参数
Table 3. Contents and parameters of sulfide dispersed elements in primary ores of Zhugongtang Pb-Zn deposit
项目 测试对象 样品数 Ga Ge Tl Cd In Re Se Ga/In Zn/Cd 矿石 闪锌矿 13 92.09 0.33 0.68 694.00 5.32 0.0045 1.88 17.31 737.17 方铅矿 8 0.31 1.29 6.32 10.59 0.48 0.0039 - 0.65 292.34 黄铁矿 6 0.72 1.81 0.47 6.69 0.27 0.0047 0.42 2.68 878.40 地壳丰度 15 1.5 0.45 0.2 0.1 0.0004 0.05 富集系数 闪锌矿 6.14 0.22 1.52 3470.00 53.21 11.35 37.69 方铅矿 0.02 0.86 14.04 52.97 4.84 9.69 - 黄铁矿 0.05 1.21 1.05 33.44 2.67 11.67 8.33 比值 闪锌矿/方铅矿 294.70 0.25 0.11 65.51 11.00 1.17 - 闪锌矿/黄铁矿 128.35 0.18 1.45 103.76 19.90 0.97 - 方铅矿/黄铁矿 0.44 0.71 13.38 1.58 1.81 0.83 4.52 注：原始数据来自表 2；地壳丰度引自文献[15]. 元素含量单位为10－6（质量分数）.
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表 4 猪拱塘铅锌矿床闪锌矿中元素相关系数矩阵表
Table 4. Correlation coefficient matrix of elements in sphalerite of Zhugongtang Pb-Zn deposit
元素 Zn Ga Ge Tl Cd In Re Se Pb Zn 1 Ga -0.17 1 Ge 0.23 -0.35 1 Tl 0.14 -0.26 -0.02 1 Cd 0.02 -0.26 0.12 -0.17 1 In -0.07 -0.28 0.11 -0.11 -0.24 1 Re 0.47 -0.03 0.14 -0.46 -0.08 -0.11 1 Se 0.51 -0.12 -0.10 -0.37 -0.01 0.06 0.29 1 Pb -0.11 0.56 -0.16 0.05 -0.34 -0.19 -0.06 -0.25 1
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表 5 猪拱塘铅锌矿床方铅矿中元素相关系数矩阵表
Table 5. Correlation coefficient matrix of elements in galena of Zhugongtang Pb-Zn deposit
元素 Zn Ga Ge Tl Cd In Re Pb Zn 1 Ga -0.55 1 Ge -0.37 0.71 1 Tl 0.17 -0.51 -0.34 1 Cd -0.04 -0.22 -0.19 0.69 1 In 0.07 -0.39 -0.58 0.00 -0.18 1 Re -0.14 0.43 -0.07 -0.30 0.18 0.30 1 Pb -0.43 0.64 0.85 0.06 0.02 -0.42 0.00 1
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