埃及中东部沙漠 Khor Um Safi 溪流沉积物的矿物学特征

IF 1.1 4区 地球科学 Q3 GEOLOGY
Marwa M. Abdel-Azeem
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引用次数: 0

摘要

本研究旨在调查作为经济重矿物可能来源的溪流沉积物的矿物学特征。对沉积物中的重矿物含量进行了分离和鉴定,其中最丰富的经济重矿物是钛铁矿、磁铁矿、石榴石、金红石、褐铁矿、锆石、独居石和锡石。除了已确定的经济重矿物外,还发现了一些含放射性和稀土元素的矿物,包括:透辉石、氙石和赤铁矿。此外,沉积物中还含有萤石、磷灰石和金。所研究的溪流沉积物的特点是,通常与黑云母岩相关的主要氧化物和微量元素浓度适中,而与长英岩相关的主要氧化物和微量元素浓度较高,这表明它们来自不同的来源。溪流沉积物中的铬/钒比值较低(平均值 = 0.48),这表明超基性岩源对溪流沉积物的影响微乎其微。放射性测量结果表明,钍的含量高于铀,因为这些沉积物很可能是钍矿和独居石等钍矿物的天然捕集器。eU/eTh 比值较低(平均 = 0.17),表明铀的去除是由于超基因过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mineralogical signature of Khor Um Safi stream sediments, Central Eastern Desert, Egypt

Mineralogical signature of Khor Um Safi stream sediments, Central Eastern Desert, Egypt

The present work deals with the investigation of the mineralogical characteristics of stream sediments, as possible source of economic heavy minerals. Their heavy minerals content was separated and identified, and the most abundant economic heavy minerals are ilmenite, magnetite, garnet, rutile, leucoxene, zircon, monazite, and cassiterite. Besides the identified economic heavy minerals, some radioactive and REE-bearing minerals were found too including: thorite, xenotime, and chernovite. Also, fluorite, apatite and gold occur in the sediments. The studied stream sediments are characterized by moderate concentrations of major oxides and trace elements commonly associated with mafic rocks, and high concentrations of those associated with felsic rocks, suggesting that they were derived from different sources. The existence of some elements was interpreted in terms of their occurrence in the structure of the recorded accessory minerals such as Th, Zr, and Y. The low values of the Cr/V ratio of the stream sediments (Average = 0.48) indicate a negligible contribution from ultrabasic sources. The radioactivity measurements show a predominance of thorium over uranium as these sediments are most likely pronounced natural trap for the thorium minerals such as thorite and monazite. The low values of eU/eTh ratio (average = 0.17) indicate the removal of uranium due to supergene processes.

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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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