贵州天桥铅锌矿床分散元素赋存状态及规律

The Occurrence States and Regularities of Dispersed Elements in Tianqiao Pb-Zn Ore Deposit,Guizhou Province,China

利用电子探针(EPMA)、电感耦合等离子质谱(ICP-MS)等分析了天桥铅锌矿床矿石矿物中分散元素的含量、赋存状态及规律,结果表明分散元素在该矿床中含量达到了综合利用评价指标,有的甚至达到了工业品位(如Cd等);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,其规律为Ga、Cd、In等赋存在闪锌矿中,Ge、Tl等赋存在方铅矿中,黄铁矿中分散元素富集低;在不同颜色闪锌矿中,Ga、Cd富集规律表现为浅色闪锌矿>中色闪锌矿>黑色闪锌矿,而Ge、Tl、In、Se富集表现出中色闪锌矿相对高于浅色及黑色闪锌矿;同标本中,不同颜色闪锌矿的Ge、In富集规律在还显示浅色闪锌矿>中色闪锌矿>黑色闪锌矿,而Ga、Tl、Cd、Se富集规律呈现中色闪锌矿相对高于浅色及黑色闪锌矿。Ga/In、Zn/Cd等参数指示出矿床成因类型可能为热液-沉积-改造。

In this study, contents, occurrence states and regularities of the dispersed elements in ore minerals of Tianqiao Pb-Zn ore deposit were analyzed by using the methods of Electron Probe Microanalysis （EPMA） and Inductively Coupled Plasma Mass Spectrum （ICP-MS）. The results showed that the contents of dispersed elements in Tianqiao Pb-Zn ore deposit had arrived at the level of comprehensive utilization, and some elements had even reached production grade （such as Cd, etc）. The occurrence states of the dispersed elements may-be allomerism in the sulfide minerals. Ga, Cd, In, etc, are distributed in sphalerite, and Ge, Tl, etc, are distributed in galena, and all of the elements dispersed elements in pyrite are low. The concentrations of Ga, Cd in sphalerite are according the order of lightcoloured sphalerite 〉 mesocratic sphalerite 〉 black sphalerite, and the concentrations of Ge, TI, In, Se in mesocratic sphalerite are higher than those in lightcoloured and black sphalerite. In the the same sample, the concen- trations of Ge, In are according the order of lightcoloured part 〉 mesocratic part 〉 black part, and the concentra- tions of Ga, TI, Cd, Se in mesocratic part are higher than lightcoloured and black parts. The ratios of the Ga/In, Zn/Cd, etc indicate the metallogenetic deposit might be hydrothermal-sedimentogenic- diplogenetic- regenerated.