湘中锡矿山锑矿床方解石稀土元素地球化学及其找矿指示意义
REE geochemical characteristics of calcites in the Xikuangshan antimony deposit, central Hunan and their indicative significances for prospecting
查看参考文献50篇
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文摘
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湘中锡矿山锑矿床是世界上最大的锑矿床,被誉为“世界锑都”,但由于已开采了100多年,目前资源面临枯竭,亟需新的成矿理论和找矿方法来指导其深边部的找矿工作。方解石作为贯通矿物,在锡矿山矿区分布广泛,从成矿早期、成矿晚期到成矿后均有分布。在对其野外地质特征、手标本及镜下特征进行详细研究的基础上,本文探讨了该区不同期次方解石的稀土元素地球化学特征、稀土元素配分模式的差异性、以及这种差异性稀土元素配分模式的找矿指示意义。研究表明,成矿期方解石其稀土元素配分模式均表现为MREE和HREE富集型,而成矿后方解石则为LREE富集型或者平坦型,且成矿早期和成矿晚期也存在明显差异。富MREE和HREE、且轻、重稀土分异强烈的方解石,可用来寻找矿区浅部和周边石英-辉锑矿型富矿体;而富MREE和HREE、且轻、重稀土分异程度中等的方解石,可用于寻找矿区深部的盲矿体(方解石-辉锑矿型矿石)。成矿期方解石富MREE和HREE的这种配分模式,在华南锑矿床和卡林型金矿床中均普遍存在,因此,方解石有望成为华南地区寻找锑矿和卡林型金矿一种新的指示矿物。 |
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其他语种文摘
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The Xikuangshan deposit, located in central Hunan, is the largest antimony deposit throughout the world, and it is titled as “the capital of antimony”. Due to the long-time mining of over 100 years, antimony resource of the Xikuangshan deposit is going to be exhausted in the near future. Therefore, new metallogenic theories and prospecting methods are urgently needed to guide the further prospecting of antimony resources in the depth of the Xikuangshan district and in its adjacent area. As a penetrating mineral, calcite is widely distributed in the Xikuangshan ore district. There are the early-ore stage calcite, late-ore stage calcite, and post-ore stage calcite. Based on the detailed studies on the field geological characteristics of the deposit, macrographic and micrographic characteristics of calcites of different stages in hand specimens and samples from this deposit, we have studied geochemical characteristics of rare earth elements (REE) and the distinct differences of REE distribution patterns of various calcites, and have explored indicative significances of these distinctly different REE patterns for the further mineral exploration. The results show that calcites of ore stages (the early-ore and late-ore stages) have REE patterns characterized by MREE-and HREE-enrichment, while calcites of post-ore stage display the LREE-enriched or flat REE patterns. In addition, there is obvious difference between REE patterns of calcites of the early-ore stage and those of calcites of the late-ore stage. Calcites with MREE-and HREEenrichment and strong LREE/HREE fractionation, can be used to prospect high-grade quartz-stibnite vein type of ores in the shallow level of the Xikuangshan ore district and in its adjacent area, whereas calcites, characterized by MREE-and HREE-enrichment and moderate LREE/HREE fractionation, can be used to prospect the concealed calcite-stibnite vein type of ores in the depth of the ore district. The REE patterns characterized with MREE-and HREE-enrichment for calcites of early-ore and late-ore stages are also commonly appeared in other antimony deposits and the Carlin-type gold deposits in South China. Therefore, calcite is expected to be a new potential indicator mineral for prospecting antimony deposits and the Carlin-type gold deposits in South China. |
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来源
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矿物学报
,2023,43(1):38-48 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2022.42.090
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关键词
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方解石
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稀土元素
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指示矿物
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锑矿床
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锡矿山
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地址
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1.
湖南城市学院土木工程学院, 湖南, 益阳, 413000
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湖南有色金属职业技术学院资源环境系, 湖南, 株洲, 412000
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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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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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湖南省自然科学基金
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国家重点研发计划项目
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文献收藏号
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CSCD:7509817
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