超生高岭土粘土矿床的矿物学特征和地球化学特征:尼日利亚中北部罗普复合高岭土的启示

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-08-27 DOI:10.3390/min14090869
Adamu Yunusa, Hanlie Hong, Atif Salim, Tarig Amam, Chen Liu, Yanxiao Xu, Xiaochao Zuo, Zhaohui Li
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引用次数: 0

摘要

本研究介绍了罗普综合体内粘土矿床和相关岩石类型的化学和矿物成分,以评估母岩岩性对矿床的高岭土化、成因和用途的影响。研究人员从罗普岩群的六个地点采集了风化剖面 E 层及其基岩中具有代表性的高岭土样本。粘土矿物学是通过 XRD 技术测定的,而地球化学分析则是通过 XRF、SEM 和 EDS 以及 ICP-MS 进行的。结果表明,除了 AS1 高岭土只含有少量高岭石(20%),而主要是伊利石(65%)外,所有高岭土都主要含有高岭石,含量在 77%-98% 之间。高岭石的结晶度明显较低(HI 值为 0.53-1.1),粒度也明显较小,这与火成岩经强烈化学风化形成高岭石的情况相吻合。AS1 高岭土很可能是在埋藏阶段由于火山晚期对地下水的加热而热液蚀变形成的。可移动微量元素(Sr、Ba 和 Eu)呈贫化趋势,而不可移动元素(Hf、Ta 和 Th)则呈富集趋势。高岭土中相对较多的锆元素意味着低温高岭土化的形成。高岭石含量明显偏高,同时含有合理水平的 Fe2O3 和 TiO2,这表明其质量属于中等级别。此外,岩石和高岭土样本中的软玉稀土元素(REE)模式呈现出一致的趋势,表明轻稀土元素(LREE)相对富集,同时存在明显的负 Eu 异常。丰富的高岭石和硅铝成分使高岭土适用于耐火材料、制药、化妆品和水泥基辅助材料(SCM)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mineralogical Characterization and Geochemical Signatures of Supergene Kaolinitic Clay Deposits: Insight of Ropp Complex Kaolins, Northcentral Nigeria
This study presents the chemical and mineralogical composition of clay deposits and associated rock types within the Ropp Complex in order to assess the influence of parent lithology on the kaolinization, genesis, and utility of the deposit. Representative kaolin samples from E horizons of the weathering profiles and their bedrocks were collected from six sites in the Ropp Complex. Clay mineralogy was determined via the XRD technique, while a geochemical analysis was conducted using XRF, SEM coupled with EDS, and ICP-MS. The results showed that all kaolins dominantly contain kaolinite with a content of 77%–98% except for the AS1 kaolin with only minor kaolinite (20%) but mainly illite (65%). The notably lower crystallinity of kaolinite (HI value of 0.53–1.1) as well as its markedly small grain size is consistent with the formation of kaolinite from intensive chemical weathering of igneous rocks. The AS1 kaolin was probably formed from hydrothermal alteration in the burial stage due to the heating of groundwater by the late volcanism. Mobile trace elements (Sr, Ba, and Eu) exhibited a depletion trend, while immobile elements (Hf, Ta, Th) showed enrichment. The relatively more zirconium in kaolins implies the formation of low-temperature kaolinization. The notably high kaolinite content, accompanied by reasonable levels of Fe2O3 and TiO2, signifies a medium-grade quality. Furthermore, chondrite-normalized rare earth element (REE) patterns exhibit congruent trends in rocks and kaolin samples, indicating a relative enrichment in light rare earth elements (LREEs) alongside a discernible negative Eu anomaly. The abundant kaolinite and silicon–aluminum composition make the kaolins suitable for refractories, pharmaceutics, cosmetics, and supplementary cementitious material (SCM).
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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