黔西北峨眉山玄武岩顶部Fe-Al岩系钪、铌、稀土分布特征与富集规律
Distribution characteristics and enrichment regulations of Sc, Nb, and REE in the Fe-Al rock series on top of the Emeishan basalt in the northwestern Guizhou, China
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文摘
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在黔西北峨眉山玄武岩顶部与上覆宣威组(P3x)/龙潭组(P3l)不整合接触界面附近,常分布一套Fe-Al岩系,近年发现其中Sc、Nb和REE等关键金属富集特征显著,对这套铁铝岩系中Sc、Nb、REE的分布特征、富集规律和赋存形式研究。结果表明:1)Fe-Al岩系中富集的Sc、Nb和REE等关键金属,多数已达到综合利用标准,具有较好成矿前景;2)宣威组(P3x)Fe-Al岩系中,Sc、Nb和REE分布均匀、差异较小,Sc主要富集于下部,Nb主要富集于上部,REE主要富集于中下部,主要赋存岩性分别为含凝灰质铁质粘土岩、豆鲕状铝土质粘土岩和铝质粘土岩;3)龙潭组(P3l)Fe-Al岩系中,Sc主要分布于中部和南西部,Nb和REE主要分布于北部、南西部,Sc主要富集于下部,Nb和REE主要富集于上部及上覆煤系地层底部,主要赋存岩性分别为凝灰质粘土岩、植物屑粘土岩和碳质粘土岩;4)Sc和Nb主要以类质同象形式呈分散状态赋存于粘土矿物、独居石、金红石等中, REE以离子吸附态、类质同象和独立矿物等多种赋存;5)Sc、Nb、REE富集经历了风化作用初始富集,后期成岩改造作用再次富集过程,此外,还与Fe-Al岩系完整性有关。 |
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其他语种文摘
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Previous researched showed that a set of Fe-Al rock series which were hosted in the unconformity contact between the top of the Emeishan basalt and the overlying Xuanwei Formation (P3x)/Longtan Formation (P3l) are generally distributed in the northwestern Guizhou. They are characterized with obvious enrichment of the critical metal resources including Sc, Nb, and REE. In this paper, we have carried out the research on the distribution characteristics, enrichment regulations and occurrence forms of Sc, Nb, and REE in this Fe-Al rock series, and have given following conclusions. (1) Most of the key metals such as Sc, Nb and REE enriched in the Fe-Al rock series have reached the comprehensive utilization requirement with good prospecting potetial; (2) In the Fe-Al rock series of the Xuanwei Formation (P3x), Sc, Nb, and REE are evenly distributed with small differences. Sc is mainly concentrated in the lower part, Nb is mainly concentrated in the upper part, and REE is mainly concentrated in the middle and lower parts. The Sc, Nb, and REE are mainly hosted in tuffaceous ferrous claystone, oolitic bauxite-bearing claystone, and aluminous claystone; (3) In the Fe-Al rock series of the Longtan Formation (P3l), Sc is mainly distributed in the middle and southwest parts, Nb and REE are mainly distributed in the north and southwest parts, Sc is mainly concentrated in the lower part, and Nb and REE are mainly concentrated in the upper part of the Fe-Al rock series and the bottom of the overlying coal-bearing strata. Sc, Nb, and REE are mainly hosted in tuffaceous claystone, plant clastic claystone, and carbonaceous claystone; (4) Sc and Nb are mainly presented in the form of isomorphism in clay minerals, monazite, and rutile, while REE are presented in various forms such as ion adsorption, isomorphism, and independent minerals; (5) The enrichment of Sc, Nb, and REE has experienced the initial enrichment by weathering, and the re-enrichment by diagenetic reformation in the late period. In addition, the enrichment of Sc, Nb, and REE is closely related to the integrity of the Fe-Al rock series. |
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来源
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矿物学报
,2021,41(4/5):520-530 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2021.41.111
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关键词
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关键矿产
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Fe-Al岩系
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富集规律
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黔西北地区
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地址
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贵州省有色金属和核工业地质勘查局地质矿产勘查院, 贵州, 贵阳, 550005
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贵州省有色金属和核工业地质勘查局, 贵州, 贵阳, 550005
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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, 550002
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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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贵州省新兴产业矿产资源调查评价项目
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文献收藏号
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CSCD:7039712
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