The genesis of fluorite veins in Gabal El Atawi granite, Central Eastern Desert, Egypt

Fawzy, Khairiya M.

doi:10.1016/j.jafrearsci.2017.03.025

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…Salman [18] carried out geochemical prospecting studies for radioactive mineralization at G. El Atawi area. Fawzy [19] studied the genesis of fluorite veins cutting the western part of the pluton.…”

Section: Gabal El Atawi Granitic Pluton Is Located At the Eastern Parmentioning

confidence: 99%

Characterization of a Post Orogenic A-Type Granite, Gabal El Atawi, Central Eastern Desert, Egypt: Geochemical and Radioactive Perspectives

Fawzy¹

2017

OJG

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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.

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Section: Gabal El Atawi Granitic Pluton Is Located At the Eastern Parmentioning

confidence: 99%

Characterization of a Post Orogenic A-Type Granite, Gabal El Atawi, Central Eastern Desert, Egypt: Geochemical and Radioactive Perspectives

Fawzy¹

2017

OJG

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“…Fluid inclusions (Fls) and stable isotopes (e.g., hydrogen and oxygen) have been widely used to recognize the origin and evolution of ore-forming fluids (Constantopoulos, 1988;Guilhaumou, Ellouz, Jaswal, & Mougin, 2000;Palmer & Williams-Jones, 1996;Pei et al, 2017;Zou, Zhang, Chen, Fang, & Zeng, 2016), and rare earth element (REE) studies are helpful to reveal the genesis of fluorite deposits (Fawzy, 2018;Sánchez et al, 2010;Schwinn & Markl, 2005;Subías & Fernández-Nieto, 1995). Due to the similar elemental behaviours between Sr and Ca, Sr isotopes can be used to determine the source of Ca (Deng et al, 2015;Ruiz, Kesler, & Jones, 1985;Ruiz, Kesler, Jones, & Sutter, 1980;Sato et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Formation timing and genesis of Madiu fluorite deposit in East Qinling, China: Constraints from fluid inclusion, geochemistry, and H–O–Sr–Nd isotopes

Pei

Zhang

et al. 2019

Geological Journal

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The Heyu fluorite ore district is newly discovered in the East Qinling metallogenic belt (EQMB), central China. In this district, the large Madiu fluorite deposit contains five Mesozoic granite‐hosted orebodies. The deposit may have formed at shallow depth and occurred as continuous veins controlled by a series of N‐S‐ or NE‐trending, steeply dipping faults. The fluorite mineralization can be divided into two stages (I and II). Fluid inclusions in stage I fluorite homogenized at 132.2°C to 342.5°C (peak at 170°C–210°C) with salinities of 0.18 to 4.43 wt% NaCl equiv, whilst those in stage II fluorite homogenized at 122.2°C to 305.7°C (peak at 130°C–170°C) and salinities of 0.18 to 3.71 wt% NaCl equiv. Raman spectroscopic analysis of the fluid inclusions reveals that they comprise predominantly H2O. The rare earth element (REE) characteristics indicate that the deposit is of hydrothermal origin. The δ18OH2O (−8.8‰ to −0.5‰) and δDH2O (−69.0‰ to −61.9‰) values show a subhorizontal trend, suggesting that the oxygen isotopic compositions were modified by fluid–rock interactions. Fluid inclusion and stable isotopic data suggest that the ore‐forming fluids belong to a meteoric water‐sourced, medium–low temperature, and low salinity NaCl–H2O system. Initial fluorite 87Sr/86Sr ratios (0.708879–0.709682) resemble those of the Heyu batholith. The water–rock reaction, which leached Ca from the host rock and increased the fluid pH, was likely causative to the ore precipitation. Geochemical and mineralization features suggest that the Madiu fluorite deposit is best classified as a fault‐controlled hydrothermal vein‐type fluorite deposit. The Sm–Nd isochron age of 118.9 ± 7.8 Ma and its regional age correlation suggest that the fluorite mineralization occurred under regional extension or lithospheric thinning setting and that the fluorite mineralization was an important component of the Early Cretaceous mineralization event in the EQMB.

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The Pan-African Nonmetallic Mineral Deposits of Egypt: Genetic and Exploration Constraints

Abdalla

Saleh

2020

Regional Geology Reviews

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The genesis of fluorite veins in Gabal El Atawi granite, Central Eastern Desert, Egypt

Cited by 7 publications

References 13 publications

Characterization of a Post Orogenic A-Type Granite, Gabal El Atawi, Central Eastern Desert, Egypt: Geochemical and Radioactive Perspectives

Characterization of a Post Orogenic A-Type Granite, Gabal El Atawi, Central Eastern Desert, Egypt: Geochemical and Radioactive Perspectives

Formation timing and genesis of Madiu fluorite deposit in East Qinling, China: Constraints from fluid inclusion, geochemistry, and H–O–Sr–Nd isotopes

The Pan-African Nonmetallic Mineral Deposits of Egypt: Genetic and Exploration Constraints

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