Geochemistry, mineralogy, and radioactivity of the Abu Furad Area, Central Eastern Desert, Egypt

Geochemistry, mineralogy, and radioactivity of the Abu Furad Area, Central Eastern Desert, Egypt

Abu Furad is in the Central Eastern Desert, Egypt. It comprises metasediments, metavolcanics, metagabbros, syn- to late-orogenic granites, and post-orogenic granites, in addition to numerous dykes and veins of different shapes and composition invading all the older rocks cropping out in the study ar...

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Bibliographic Details
Published in:Acta geochimica Vol. 38; no. 2; pp. 307 - 326
Main Authors: El Mezayen, A. M., Abu Zeid, E. K., Hosny, W. S., El-Feky, M. G., Omar, S. M., Taalab, S. A.
Format: Journal Article
Language:English
Published: Heidelberg Science Press 03-04-2019
Springer Nature B.V
Subjects:
Apatite
Chromium
Composition
Continental crust
Deserts
Dikes
Diorite
Earth
Earth and Environmental Science
Earth crust
Earth Sciences
Fluorite
Geochemistry
Granite
Lava
Magma
Mineralogy
Minerals
Monazite
Nickel
Organic chemistry
Original Article
Orogeny
Quartz
Radioactivity
Ratios
Rock
Rocks
Thorite
Thorium
Titanite
Trace elements
Uranium
Xenotime
Zircon
Eastern Desert
Egypt
Major oxide and trace elements
Mineralogy
Egypt
Geochemistry
Radiometry
Altered syenogranites
Hydrothermal alterations
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Summary:Abu Furad is in the Central Eastern Desert, Egypt. It comprises metasediments, metavolcanics, metagabbros, syn- to late-orogenic granites, and post-orogenic granites, in addition to numerous dykes and veins of different shapes and composition invading all the older rocks cropping out in the study area. Field, petrographic, mineralogical, and chemical investigations led to the classification of Abu Furad granites as quartz diorite, tonalite, granodiorite, and syenogranites.Major oxide and trace element data revealed that the syn- to late-orogenic granites and post-orogenic granites are peraluminous. Syn- to late-orogenic granites originated from calc-alkaline volcanic arc–related magma; while the post-orogenic granites (syenogranite) are highly fractionated, calc-alkaline granite from a within plate regime. Radiometrically, the studied quartz diorite, tonalite, and granodiorite had lower uranium and thorium contents and higher eU/eTh ratios than the syenogranites. This may indicate that the syn- to late-orogenic rocks originated from sources depleted in these elements. The average eTh/eU ratio of syenogranites was higher than that of average continental crust, suggesting that the syenogranites are relatively depleted in U. The studied altered syenogranites were strongly enriched in U and Th compared to the Earth’s crust. On the other hand, the average of eU in pegmatites is lower than the global average for uraniferous pegmatites. The most recorded accessory minerals in the altered syenogranites were thorite, fergusonite, samarskite, columbite, zircon, monazite, xenotime, apatite, fluorite, sphene, atacamite, and malachite, in addition to chromium and nickel inclusions.
ISSN:2096-0956
2365-7499
DOI:10.1007/s11631-018-0302-7