Trace Elements and Rare Earth Elements of Sulfide Minerals in the Tianqiao Pb‐Zn Ore Deposit, Guizhou Province, China
Trace Elements and Rare Earth Elements of Sulfide Minerals in the Tianqiao Pb‐Zn Ore Deposit, Guizhou Province, China
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DOI：
10.1111/j.1755-6724.2011.00389.x
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
Zhou Jiaxi;Huang Zhilong;Zhou Guo-fu;Li Xiaobiao;Ding Wei;Bao Guangping
中科院分区：
文献类型：
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作者：
Zhou Jiaxi;Huang Zhilong;Zhou Guo-fu;Li Xiaobiao;Ding Wei;Bao Guangping
采用电感耦合等离子体质谱法测定了硫化物矿物中的微量元素和稀土元素。结果表明，V、Cu、Sn、Ga、Cd、In、Se富集于闪锌矿中，Sb、As、Ge、Tl富集于方铅矿中，黄铁矿中几乎所有微量元素含量都较低。浅黄色闪锌矿的Ga和Cd含量高于棕色和黑色闪锌矿。棕色闪锌矿中Ge、Tl、In和Se的含量高于浅黄色闪锌矿和黑色闪锌矿。结果表明，黄铁矿中稀土元素含量高于闪锌矿和方铅矿。在闪锌矿中，稀土元素浓度从浅黄色闪锌矿、棕色闪锌矿到黑色闪锌矿依次递减。闪锌矿和黄铁矿的Ga/In比值均大于10，Co/Ni比值均小于1，表明天桥铅锌矿床的成因可能属于沉积改造型热液成因。闪锌矿中LnGa和LnIn、方铅矿中LnBi和LnSb的关系表明，天桥铅锌矿床可能属于沉积改造成因。球粒陨石归一化稀土谱图显示，δEu为负异常（0.13 ~ 0.88），δCe无明显异常（0.88 ~ 1.31）；所有样品的总稀土浓度均较低（<3 ppm），轻稀土/高稀土比值范围较广（1.12 ~ 12.35）。这些结果表明成矿流体发生在还原环境下。对比下石炭统大唐组闪锌矿、方铅矿、黄铁矿、矿石、蚀变白云岩、地层碳酸盐岩和黄铁矿的稀土元素组成和参数，表明成矿流体可能来自多组分体系，即不同的年代地层单元可能对成矿流体有重要贡献。结合构造环境和前人同位素地球化学证据，认为矿床成因为热液、沉积改造，成矿流体具有多源特征。
Trace elements and rare earth elements (REE) of the sulfide minerals were determined by inductively‐coupled plasma mass spectrometry. The results indicate that V, Cu, Sn, Ga, Cd, In, and Se are concentrated in sphalerite, Sb, As, Ge, and Tl are concentrated in galena, and almost all trace elements in pyrite are low. The Ga and Cd contents in the light‐yellow sphalerites are higher than that in the brown and the black sphalerites. The contents of Ge, Tl, In, and Se in brown sphalerites are higher than that in light‐yellow sphalerites and black sphalerites. It shows that REE concentrations are higher in pyrite than in sphalerite, and galena. In sphalerites, the REE concentration decreases from light‐yellow sphalerites, brown sphalerites, to black sphalerites. The ratios of Ga/In are more than 10, and Co/Ni are less than 1 in the studied sphalerites and pyrites, respectively, indicating that the genesis of the Tianqiao Pb–Zn ore deposit might belong to sedimentary‐reformed genesis associated with hydrothermal genesis. The relationship between LnGa and LnIn in sphalerite, and between LnBi and LnSb in galena, indicates that the Tianqiao Pb–Zn ore deposit might belong to sedimentary‐reformed genesis. Based on the chondrite‐normalized REE patterns, δEu is a negative anomaly (0.13–0.88), and δCe does not show obvious anomaly (0.88–1.31); all the samples have low total REE concentrations (<3 ppm) and a wide range of light rare earth element/high rare earth element ratios (1.12–12.35). These results indicate that the ore‐forming fluids occur under a reducing environment. Comparison REE compositions and parameters of sphalerites, galenas, pyrites, ores, altered dolostone rocks, strata carbonates, and the pyrite from Lower Carboniferous Datang Formation showed that the ore‐forming fluids might come from polycomponent systems, that is, different chronostratigraphic units could make an important contribution to the ore‐forming fluids. Combined with the tectonic setting and previous isotopic geochemistry evidence, we conclude that the ore‐deposit genesis is hydrothermal, sedimentary reformed, with multisources characteristics of ore‐forming fluids.