El-Daghbag-I gold mineralization is a part of El-Daghbag gold deposit, Central Eastern Desert, Egypt. It is represented by several NW-trending quartz veins cutting across highly sheared granodiorite rocks along NW-trending shear zone. The recorded ore mineral assemblage is magnetite, ilmenite, native gold, pyrite, chalcopyrite, sphalerite and galena. Bornite, covellite and goethite are the secondary ore minerals. Statistical parameters, Clark of Concentration, linear productivity, contrast coefficient, zonality index and zoning coefficient were calculated to investigate the geochemical association and whether there are factors controlling distribution of its members. The geochemical primary distribution patterns of gold and the elements properly forming the mineralization revealed that the gold associated elements are (Cu, As, Zn, Ni, Co, Ag and Pb). These elements occur as proper ore sulfide-minerals. The recorded lateral zoning sequence of deposition along the NW-SE extension of the main quartz vein is (Ag-Co-Ni-Cr-Cu-As-Zn-Pb). The lateral zoning sequence along the SW-NE trend crossing the quartz vein exhibits variable depositional sequence is (Ag-Co-Cr-Ni-Cu-As-Pb-Zn). With regard to position of the ore metals in the general sequence of zoning, the gold potential of the central and southeastern parts, due to its probable accumulation at deeper levels of the mineralization, are expected to be promising. Drilling is recommended for studying the vertical zoning of these elements to reveal the site of gold accumulation.
The alkali feldspar granite of Gabal El Atawi is post orogenic granite originated from subalkaline magma in extensional suite. It is developed within plate tectonic setting and has A 2 -type character which generated from apparent crustal source. The petrographic, geochemical and radioactive characteristics of El Atawi granite meet and fulfill the requirements of being fertile granite and it can be considered as promising uraniferous granite. Fluid inclusion studies of the altered granite elucidated two different solutions acting on the host granitic pluton. The first is NaCl-CaCl low temperature fluid with a wide range of salinity. The second is high temperature and salinity Fe-Mg-Na chloride solution. Different fractures in the granite acted as good channels for the hydrothermal fluids that leached uranium from its bearing minerals disseminated all over the host granite and redeposited it in the alteration zones.
Remote sensing and geochemical data are used to discriminate between the different varieties of island arc assemblage covering Marahiq area, South Eastern Desert of Egypt. The Precambrian basement rocks exposed in the study area comprise ophiolite and island arc assemblages. The ophiolitic rocks include serpentinites and talc-carbonate, while the metavolcanics and metavolcanosedimentary rocks represent the island arc assemblage. Petrographically, the island arc units are differentiated in to metabasalt, meta-andesite, metadacite, meta-andesitic tuffs, chlorite talc schist and biotite chlorite schist. The geochemical data revealed that these metavolcanics and metavolcanosedimentary rocks are calcalkaline to tholeiite in nature with low to medium-K, and likely represent an immature island arc. Image processing techniques applicable to the Enhanced Thematic Mapper (ETM+) data are used for mapping and delineating exposures of the different island arc units at the Marahiq area. Principal component analysis, minimum noise fraction and band rationing techniques provide efficient data for lithological mapping. New detailed map was generated as a result of the processed ETM+ images.
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