Genesis of secondary uranium minerals associated with jasperoid veins, El Erediya area, Eastern Desert, Egypt

El‐Naby, Hamdy H. Abd

doi:10.1007/s00126-007-0171-1

Cited by 30 publications

(10 citation statements)

References 22 publications

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“…The film diffusion mode (FD) and matrix diffusion mode (MD) are given respectively, by Eqs. (8) and (9) which can be used to describe the rate of the reaction [18,19]:…”

Section: Homogeneous Diffusion Model (Hdm)mentioning

confidence: 99%

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Adsorption of rare earth elements by strong acid cation exchange resin thermodynamics, characteristics and kinetics

et al. 2018

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The equilibrium and kinetic characteristics of rare earths adsorption process using the strong acid macro reticular resin Dowex 50X8 from El-Erediya chloride liqueurs have been determined. The adsorption parameters including pH, contact time, temperature, resin to aqueous ratio and rare earths initial concentration in aqueous have been optimized. The practical adsorption capacity of rare earths upon the resin under the optimum conditions has been found to attain 80 mg/g which matches with Langmuir theoretical capacity. The physical parameters including the adsorption kinetics, the isotherm models and the thermodynamic data have also been determined. The adsorption process has been found to agree with both the pseudo second order reaction, the Langmuir isotherm and confirms with the concept of the matrix diffusion controls. A successful preconcentration process for the rare earths content was done with a preconcentration factor of about 42.33. Considerable rare earths cake was precipitated from the chloride eluate solutions using oxalic acid.

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“…The film diffusion mode (FD) and matrix diffusion mode (MD) are given respectively, by Eqs. (8) and (9) which can be used to describe the rate of the reaction [18,19]:…”

Section: Homogeneous Diffusion Model (Hdm)mentioning

confidence: 99%

“…El-Erediya mineralization consists of mineralizations structurally controlled and associated with jasperoid veins that are hosted by a granitic pluton [9]. This granite exhibits extensive alteration, including silicification, argillization, sericitization, chloritization, carbonatization, and hematization [10].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of rare earth elements by strong acid cation exchange resin thermodynamics, characteristics and kinetics

et al. 2018

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“…5c). Jasperoids are rocks, composed dominantly of fine-grained quartz, that typically form by replacement of carbonates along fault zones, but there are also representative examples within plutonic host rocks (Ibrahim et al 2005;El-Naby 2008). Phase I is the product of a strong interaction between kaolinised host rocks and an ascending, Fe-rich, silica supersaturated hydrothermal fluid along the preexisting Pfahl shear zone.…”

Section: Quartz Formationmentioning

confidence: 99%

Upper crustal fluids in a large fault system: microstructural, trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl, SE Germany

Schaarschmidt

Haase

Wall

et al. 2018

Int J Earth Sci (Geol Rundsch)

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Fault systems are zones of crustal weakness and are used as pathways for ascending hydrothermal fluids. One impressive example is the more than 150 km long Bavarian Pfahl system at the SW boundary of the Bohemian Massif. Dextral ductile shearing of Moldanubian basement has shaped a several hundred meter wide zone of mylonites and ultramylonites. This setting was reactivated under brittle conditions and infiltrated by fluids resulting in a multi-phase quartz lode. Structural analysis using scanning electron microscopy cathodoluminescence (SEM-CL) images has been carried out in combination with trace element and oxygen isotope analysis on quartz along the system. Three successive quartz phases have been distinguished due to their structural details and trace element contents. Cryptocrystalline quartz fabric in the first quartz phase results from crystallization from a silica gel, whereas in phases II and III, quartz precipitation is characterized by repeated fragmentation and sealing, visible due to strongly varying CL intensities. The δ 18 O of Bavarian Pfahl quartz decreases from 13.8‰ in the NW to 8.5‰ in the SE, whereas quartz from the close-by-situated Wölsendorf fluorite deposit shows δ 18 O between 15.9 and 18.5‰ (vs. SMOW). Flat shale-normalized rare earth element patterns point towards an upper crustal origin of the hydrothermal fluids. The southeastern part of the Bavarian Pfahl is interpreted to represent a deeper crustal level with higher mineralization temperatures (about 350 °C) compared to the rest of the Pfahl (< 250 °C).

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“…High resolution RGB (7,6,1) These rounded to ellipsoidal vugs are filled by calcite, adularia and secondary uranium minerals in corona textures (Fig. 32).…”

Section: Fig27amentioning

confidence: 99%

Uranium Mineralization in Shear Zones: An Overview

2020

International Journal of Mining Science

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Genesis of secondary uranium minerals associated with jasperoid veins, El Erediya area, Eastern Desert, Egypt

Cited by 30 publications

References 22 publications

Adsorption of rare earth elements by strong acid cation exchange resin thermodynamics, characteristics and kinetics

Adsorption of rare earth elements by strong acid cation exchange resin thermodynamics, characteristics and kinetics

Upper crustal fluids in a large fault system: microstructural, trace element and oxygen isotope study on multi-phase vein quartz at the Bavarian Pfahl, SE Germany

Uranium Mineralization in Shear Zones: An Overview

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