NDLI: Geochemistry of lamprophyres associated with uranium mineralization, Southeastern Desert, Egypt

Content Provider	Springer Nature Link
Author	Ibrahim, Mohamed E. El Tokhi, Mohamed M. Saleh, Gehad M. Hassan, Mamdouh A. Rashed, Mohamed A.
Copyright Year	2007
Abstract	Two brecciated shear zones (NNW-SSE) are found crosscutting cataclastic rocks. The cataclastic rocks (3.0 km$^{2}$) occupy the core of the granitic pluton and enclose a roof pendant of mafic-ultramafic rocks. The NNW-SSE-extending lamprophyre dykes vary in thickness from 0.5 m to 1 m and up to 800 m long, cutting the cataclastic rocks and are composed mainly of plagioclases, amphiboles, relics of pyroxenes and K-feldspar phenocrysts embedded in fine-grained groundmass. They are characterized as being peraluminous, calc-alkaline in composition (chemical trap) and enriched in calcite, sulfide and P$_{2}$O$_{5}$.The lamprophyres were affected by hydrothermal alteration (chlorite-carbonate alteration) while the cataclastic rocks were affected by diagenetic alteration (K-feldspar-albite alteration).Uranium mineralization is the product of hydrothermal events and has been investigated by X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM), involving primary uranium minerals (U$_{3}$O$_{8}$) and secondary uranium minerals (uranophane and beta-uranophane, kasolite, torbernite, autonite and meta-autonite) in addition to U-bearing minerals (astrocyanite, betafite and fergusonite).The presence of different mineral parageneses associated with clay minerals indicates that the lamprophyres were subjected to acidic and alkaline mineralizing solutions. Moreover, the U-Zr/U, U-Ce/U values show negative correlations, confirming U-enrichment in both cataclastic rocks and shear zones while the Th-eU/eTh, Th-Zr/Th and Th-Ce/Th values show negative correlations, indicating that the U-bearing solutions are rich in Th in the cataclastic rocks only.
Starting Page	356
Ending Page	365
Page Count	10
File Format	PDF
ISSN	10009426
Journal	Chinese Journal of Geochemistry
Volume Number	26
Issue Number	4
e-ISSN	19930364
Language	English
Publisher	Science Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	cataclastic rock shear zone lamprophyre hydrothermal alteration Southeastern Desert Egypt Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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