Geochemical constraints on genesis of mineralized quartz-fluorite veins at south west Sinai, Egypt

IF 1.827 Q2 Earth and Planetary Sciences Arabian Journal of Geosciences Pub Date : 2024-03-23 DOI:10.1007/s12517-024-11941-4

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Abstract

This paper discusses the geochemical constraints on genesis of dispersed mineralized quartz-fluorite veins (QFV) at south west Sinai Peninsula, Egypt. These veins range from colorless to pale to deep violet in color and extend continuously and/or discontinuously in NE-SW, E-W, N-S, and NW-SE trends. They exhibit varying thicknesses ranging from a few centimeters to approximately 0.3 m. The scanning electron microscope (SEM) analysis has revealed the existence of secondary uranium minerals, notably kasolite Pb(UO₂)SiO₄.(H₂O), in association with other minerals such as galena (PbS), atacamite (Cu₂Cl(OH)₃), and fluorite (CaF₂) within the quartz-fluorite veins (QFV). Furthermore, the SEM analysis indicates a significant presence of fluorine incorporated into the biotite lattice of the host granitic rocks. Geochemically, there is a reasonable difference between the host granitic rocks and QFV, especially, silica and alumina contents. Also, some trace elements experienced enrichment in QFV such as Cu, U, Pb and Ag. The chondrite normalized pattern of QFV rare earth elements (REE) shows conspicuous negative Tb anomalies while the host rocks showed negative Eu anomalies. It is noticeable that there is a closed relation between uranium and fluorine in QFV. The Th/U ratios are < 1 in QFV samples indicating that the QFV had not been derived from magmatic origin. Furthermore, the REE and the mineral assemblages of QFV imply to hydrothermal origin (meteoric water) at shallow depth and low temperature < 200 °C under oxidation condition (epithermal genesis).

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埃及西奈半岛西南部石英萤石矿脉成因的地球化学制约因素

摘要本文讨论了埃及西奈半岛西南部分散矿化石英-萤石矿脉（QFV）成因的地球化学制约因素。这些矿脉的颜色从无色到浅紫色再到深紫色，呈东北-西南、东-西、北-南和西北-东南走向连续和/或不连续延伸。扫描电子显微镜（SEM）分析表明，在石英-萤石矿脉（QFV）中存在次生铀矿物，特别是与方铅矿（PbS）、阿塔卡米特矿（Cu2Cl(OH)3）和萤石（CaF2）等其他矿物伴生的辉锑矿（Pb(UO2)SiO4.(H2O)）。此外，扫描电镜分析表明，寄主花岗岩岩石的生物晶格中含有大量的氟。在地球化学方面，主花岗岩和 QFV 之间存在合理的差异，尤其是二氧化硅和氧化铝的含量。此外，一些微量元素也在 QFV 中富集，如铜、铀、铅和银。QFV稀土元素的软玉归一化模式显示出明显的锑负异常，而主岩则显示出Eu负异常。值得注意的是，在 QFV 中铀和氟之间存在着封闭关系。在 QFV 样品中，Th/U 比率为 < 1，表明 QFV 并非来自岩浆源。此外，QFV的REE和矿物组合暗示其热液成因（流星水）在浅层和低温< 200 °C的氧化条件下（表生成因）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-

自引率

0.00%

发文量

1587

审稿时长

6.7 months

期刊介绍： The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.