Arid
DOI10.1016/j.gexplo.2019.106378
Zonation in primary geochemical haloes for orogenic vein-type gold mineralization in the Quartz Ridge prospect, Sukari gold mine area, Eastern Desert of Egypt
Helba, Hossam A.1; Khalil, Khalil, I1; Mamdouh, Mo'; nes M.2; Khalek, Ismail A. Abdel2
通讯作者Helba, Hossam A.
来源期刊JOURNAL OF GEOCHEMICAL EXPLORATION
ISSN0375-6742
EISSN1879-1689
出版年2020
卷号209
英文摘要The Quartz Ridge prospect is one of > 100 gold occurrences distributed in the Neoproterozoic basement rocks of the Eastern Desert of Egypt. The mineralization is hosted in quartz veins along NE-trending shear zones, and their associated altered wallrocks. Opaque minerals include pyrite and arsenopyrite with less abundant chalcopyrite, galena, and sphalerite. Gold occurs as tiny inclusions and as microfracture-filling grains mainly in arsenopyrite and in deformed quartz. Sericitization, carbonatization, and silicification are the main alteration signs accompanying ore formation. The chemical analysis of 640 core samples from four selected boreholes from the study area was used for characterizing the primary geochemical haloes and their zonation developed around detected subsurface mineralized zones. Statistical analysis of the geochemical data applying techniques based on median absolute deviation (MAD) values and log-ratio transformation (CLR) was carried out to address the problems of outliers and closed compositional data, whereas statistical factor analysis (FA) combined with enrichment factor (EF) associations were used to investigate the multi-element associations describing the gold mineralization and its primary dispersion haloes. Mineralization (Au-Ag-As-Sb +/- S), alteration (Ba +/- Cu +/- Mo) and wall rock (Ni-Cr +/- Co) associations can be inferred directly by factor analysis study. However, the dispersion of trace elements around mineralized zones can better be described by their enrichment factors calculated for data subsets. More than one stage of hydrothermal activity has been suggested and believed to be responsible for precipitating ore metals and their associated elements. Molybdenum and copper were found to be good indicators for upper zones, while tungsten and zinc are good indicators for the lower or down-dip zones. The current study manifests the success of using statistical procedures based on data transformation for compositional data analysis (i.e. centered log-ratios) coupled with enrichment factors in characterizing the primary geochemical haloes and their zoning which can be effectively used to follow similar occurrences of orogenic hydrothermal gold deposits.
英文关键词Gold Log ratio transformation Primary geochemical haloes Enrichment factors Multi-element associations Quartz Ridge prospect-Egypt
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000506686000001
WOS关键词ARABIAN-NUBIAN SHIELD ; DEPOSIT ; CLASSIFICATION ; COMPLEX ; ZONES ; EXPLORATION ; EVOLUTION ; GENESIS ; BELT
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
EI主题词2020-02-01
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/312713
作者单位1.Alexandria Univ, Fac Sci, Geol Dept, Alexandria, Egypt;
2.Sukari Gold Mines Co, Red Sea Governate, Egypt
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GB/T 7714
Helba, Hossam A.,Khalil, Khalil, I,Mamdouh, Mo',et al. Zonation in primary geochemical haloes for orogenic vein-type gold mineralization in the Quartz Ridge prospect, Sukari gold mine area, Eastern Desert of Egypt[J],2020,209.
APA Helba, Hossam A.,Khalil, Khalil, I,Mamdouh, Mo',nes M.,&Khalek, Ismail A. Abdel.(2020).Zonation in primary geochemical haloes for orogenic vein-type gold mineralization in the Quartz Ridge prospect, Sukari gold mine area, Eastern Desert of Egypt.JOURNAL OF GEOCHEMICAL EXPLORATION,209.
MLA Helba, Hossam A.,et al."Zonation in primary geochemical haloes for orogenic vein-type gold mineralization in the Quartz Ridge prospect, Sukari gold mine area, Eastern Desert of Egypt".JOURNAL OF GEOCHEMICAL EXPLORATION 209(2020).
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