渝东南老厂坪铅锌矿床闪锌矿微量元素组成特征
Trace element characteristics in sphalerites from the Laochangping Pb-Zn deposit in the Southeastern Chongqing
查看参考文献64篇
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文摘
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位于扬子地台东南缘的湘西-黔东铅锌成矿带是华南低温大面积成矿域的重要组成部分。前人研究表明,该区铅锌矿床成因类型属于MVT型铅锌矿床,但是,对其中Ge和Ga的富集特征和赋存形式的研究十分薄弱。位于该成矿带西北段的渝东南的老厂坪是重庆地区最大的铅锌矿床,本文以该矿床中闪锌矿为研究对象,通过LA-ICPMS原位分析,结合激光剥蚀曲线,分析该矿床闪锌矿微量元素组成特征,揭示其中Ge和Ga等关键金属元素在闪锌矿中的分布规律及赋存形式,探讨其替代机制,为矿山关键金属Ge和Ga的综合利用提供实际依据。结果表明,该矿床闪锌矿以富集Cd、Ga、Ge、Fe,贫Mn、Co、Ni、In为特征,形成于中低温环境,其中Ge和Ga均达到了伴生工业品位要求。类质同象是其主要赋存形式,Ge和Ga在闪锌矿中分布不均是其重要特征,Cu是影响Ge和Ga富集的关键控制因素,耦合替代方式为3Zn~(2+)↔Ge~(4+)+2Cu~+和2Zn~(2+)↔Ga~(3+)+Cu~+。总体而言,该矿床闪锌矿微量元素组成特征与MVT型铅锌矿床基本一致,结合其他地质地球化学特征,本文认为该矿床属于MVT型铅锌矿床。 |
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其他语种文摘
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The Western Hunan-Eastern Guizhou Pb-Zn metallogenic belt, located in southeast margin of the Yangtze Block, is an important part of the South China large-scale low-temperature metallogenic domain. More and more studies have shown that the Pb-Zn deposits in the belt belong to the MVT type of Pb-Zn deposit. However, researches on the enrichment characteristics and existing forms of critical metals (Ge and Ga, etc.) in those deposits are very limited. The Laochangping Pb-Zn deposit of the southeastern Chongqing, located in the northwest part of the metallogenic belt, is the largest Pb-Zn deposit in Chongqing City. Based on the LA-ICPMS in-situ analysis, combined with the time-resolved depth profiles, we have realized the features of trace elements in sphalerites from the Laochangping deposit, realved the distribution regulation and existing forms of critical metals of Ge and Ga in sphalerites of the deposit, discussed their substitution mechanisms in sphalerites, and provided practical basis for the comprehensive utilization of critical metals of Ge and Ga. The results show that the sphalerite of the Laochangping deposit is characterized by the enrichment of Cd, Ga, Ge, and Fe and depletion of Mn, Co, Ni, and In. The sphalerite was formed in the medium-low temperature environment. Both Ge and Ga contents meetan the requirements of industrial grades for the associated Ga and Ge elements. The existing forms of Ga and Ge are dominated by the isomorphism. The uneven distribution of Ge and Ga in sphalerites is an important feature. Cu is a key factor controlling the enrichment of Ge and Ga in the sphalerite, with the possible coupling substitution modes of 3Zn~(2+)↔Ge~(4+)+2Cu~+ and 2Zn~(2+)↔Ga~(3+)+Cu~+. In general, the compositional characteristics of trace elements in sphalerites from the deposit are basically consistent with those of the MVT Pb-Zn deposit. Combined with other geological and geochemical characteristics of the Laochangping deposit, it is suggested that the Laochangping deposit belongs to the MVT type of Pb-Zn deposit. |
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来源
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矿物学报
,2021,41(6):623-634 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2021.41.083
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关键词
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闪锌矿
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关键金属
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Ge和Ga
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LA-ICPMS
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MVT型铅锌矿床
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渝东南老厂坪
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地址
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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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中国科学院大学, 北京, 100049
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重庆地质矿产研究院, 外生成矿与矿山环境重庆市重点实验室, 重庆, 400042
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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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贵州省项目
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国家自然科学基金
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国家重点研发计划
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文献收藏号
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CSCD:7077800
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