黔西北天桥铅锌矿床中的铊(Tl)
Thallium geochemistry of the Tianqiao Pb-Zn deposit in the northwestern Guizhou, China
查看参考文献18篇
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文摘
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天桥铅锌矿床是川滇黔接壤铅锌矿集区黔西北成矿区内很具代表性的中型矿床,赋矿岩石为石炭系碳酸盐岩,矿床严格受构造控制。本文根据该矿床单矿物黄铁矿、闪锌矿和方铅矿中分散元素铊(Tl)的含量,初步揭示了Tl的富集规律和赋存状态。结果表明,该区Tl在方铅矿中明显富集,其含量和富集系数分别为4.09×10~(-6)~7.85×10~(-6)和8.18~15.7,黄铁矿中Tl含量和富集系数分别为0.293×10~(-6)~0.463×10~(-6)和0.59~0.93,闪锌矿中Tl含量和富集系数主要在0.144×10~(-6)~0.565×10~(-6)和0.29~1.13之间。根据矿石中方铅矿的相对含量,估算其Tl含量在0.5×10~(-6)左右,接近铅锌矿石Tl综合利用最低指标。结合矿床成矿流体演化及Tl、Pb、Zn地球化学性质,认为本区Tl在演化晚期的成矿流体中相对富集,流体中的Tl以类质同象形式替代方铅矿中的Pb。 |
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其他语种文摘
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The Tianqiao Pb-Zn deposit is a representative of the medium sized deposit located in the Northwestern Guizhou Pb-Zn metallogrenic zone of the Sichuan-Yunnan-Guizhou Pb-Zn polymetallic mineralization concentration area. Its orebodies are hosted in Carboniferous carbonate rock and are strictly controlled by structures. In this study, thallium (Tl) concentrations of major sulfides (pyrite, sphalerite, and galena) from the Tianqiao Pb-Zn were analyzed by using ICP-MS techniques. The results show that the concentrations and enrichment coefficients of Tl in galenas from primary ore bodies of the deposit were significantly higher than those in pyrites and sphalerites, as contents and enrichment coefficients of Tl in galenas, pyrites, and sphalerites are 4.09-7.85 μg/g and 8.18-15.7,0.293-0.463 μg/g and 0.59- 0.93, and 0.144-0.565 μg/g and 0.29-1.13, respectively. Accordingly, Based on the relevant percentage of galena in ores, the content of Tl in ores is estimated to be 0.5 μg/g, which is close to the minimum criterion of comprehensive utilization of Tl in ores of the Pb-Zn deposit. Combined with the evolution of ore-forming fluids of the deposit and geochemical properties of Tl, Pb, and Zn, it is believed that Tl was relatively enriched in the ore-forming fluid of the late evolution stage of the deposit as Tl replaced Pb in an isomorphic form in the lattice of galena. |
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来源
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矿物学报
,2020,40(4):412-417 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2020.40.022
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关键词
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铊(Tl)地球化学
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方铅矿
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天桥铅锌矿床
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黔西北
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地址
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湖北省地质局第六地质大队, 湖北, 孝感, 432000
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中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550081
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贵州商学院旅游管理学院, 贵州, 贵阳, 550014
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贵州省地质矿产勘查局贵州省地质调查院, 贵州, 贵阳, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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贵州省项目
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文献收藏号
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CSCD:6778281
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