广西平果上二叠统合山组铝土矿中铌的赋存状态
The mode of occurrence of niobium in bauxite of the Upper Permian Heshan Formation in the Pingguo area, Guangxi Autonomous Region, China
查看参考文献52篇
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文摘
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广西平果地区上二叠统合山组铝土矿中富集关键金属铌(Nb),全岩w(Nb_2O_5)为0.025%~0.04%,平均0.035%,超过风化壳沉积型铌矿的最低工业品位,资源潜力巨大。之前的研究认为锐钛矿可能是Nb的主要载体矿物。然而,锐钛矿在铝土矿中含量较低(平均4.55%),其能否提供足够的Nb来源尚未明确。此外,是否所有锐钛矿均富Nb、是否有其他富Nb矿物存在等问题也未解决,阻碍了对该类型Nb资源的评价和综合开发利用。针对以上问题,本文采用电子探针对典型样品进行富Nb矿物鉴定和Nb含量分析,以期评估锐钛矿对全岩Nb的贡献,查明Nb的赋存状态,并探讨Nb的来源。研究显示,铝土矿中含丰富的锐钛矿,电子探针分析获得锐钛矿w(Nb_2O_5)为0.28%~0.73% (平均0.45%),结合锐钛矿总量进行计算,获得全岩w(Nb_2O_5)为0.012%~0.032%,平均0.02%,接近但低于全岩ICP-MS分析结果(0.036%),表明铝土矿中Nb主要赋存于锐钛矿中,其余少部分可能赋存于金红石中或被粘土矿物吸附。铝土矿中富Nb锐钛矿的大量出现,表明铝土矿及Nb的物源主要来自富Nb的峨眉山大火成岩省相关碱性长英质岩类。本研究获得的认识对川-滇-黔地区宣威组及龙潭组等富Nb地层的研究提供一定的参考,也可为该类型Nb资源的评价预测及开发利用提供科学依据。 |
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其他语种文摘
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Bauxite of the Upper Permian Heshan Formation in the Pingguo area, Guangxi, is strongly enriched in critical metal niobium (Nb) with Nb_2O_5 contents of 0.025%-0.04% (average 0.035%), which are higher than the cut-off grade for the weathering crust sedimentary Nb deposit. Therefore, its Nb resource is highly prospective. The previous studies suggest that Nb is hosted mainly in the anatase. However, it is not clarified whether the anatase can provide sufficient Nb for the bauxite ore as the percentage of anatase in bauxite is relatively low (averaging 4.55%). In addition, it is also not clarified whether there are any other Nb-rich minerals and if all anatase are rich in Nb. All of these questions largely hindered the compressive utilization of this type of Nb resources. In this study, electron probe micro-analysis (EPMA) was used to identify and to quantitatively analyze Nb-rich minerals in typical samples, in order to evaluate the Nb contribution of anatase relative to the whole rock, to reveal the mode of occurrence of Nb, and then to discuss the source of Nb in the bauxite ore. The EPMA results show that anatase grains contain 0.28%-0.73% (with average of 0.46%) of Nb_2O_5. Based on the contents of Nb_2O_5 in anatase grains and the percentages of anatase in bauxite ores, the calculated Nb_2O_5 contents for the bauxite ores vary from 0.012% to 0.032% (with average of 0.02%), which are close to but lower than the ICP-MS analytical results of bauxite ores (0.036%). It is indicated that the major Nb in bauxite ores is hosted in anatase grains, and the minor Nb in bauxite ores could be hosed in rutile grains or adsorbed by clay minerals. The abundant existence of Nb-rich anatase in bauxite ores indicates that the Nb in bauxite ores of the deposit could be mainly sourced from the Nb-rich alkaline felsic rocks associated with the Emeishan Large Igneous Province (ELIP). The results obtained in this study can be referenced for the study of Nb-rich clastic rocks within the Xuanwei and Lontan formations in the Sichuan-Guizhou-Guangxi area, and also could be an important scientific basis for the evaluation, exploration, and comprehensive utilization of this type of Nb resources. |
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来源
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矿物学报
,2022,42(4):453-460 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2022.42.049
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关键词
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关键金属
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铌
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铝土矿
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锐钛矿
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广西平果
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地址
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1.
河北工程大学地球科学与工程学院, 河北, 邯郸, 056038
2.
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
3.
东华理工大学, 核资源与环境国家重点实验室, 江西, 南昌, 330013
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中国科学院大学地球与行星科学学院, 北京, 100049
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长安大学地球科学与资源学院, 陕西, 西安, 710054
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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
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贵州省项目
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云南省重点研发计划项目
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河北省自然科学基金
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中国科学院地质与地球物理研究所重点部署项目
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中国科学院重点部署项目
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文献收藏号
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CSCD:7323556
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