PETROCHEMICAL AND RADIOACTIVE CHARACTERISTICS OF EL- YATIMA MONZOGRANITE, CENTRAL EASTERN DESERT, EGYPT

Document Type : Original Article

Authors

Nuclear Materials Authority,Cairo, Egypt

Abstract

The younger granite in El-Yatima area, Central Eastern Desert, cropped out as an isolated mass intruding
the older granitic rocks with sharp contacts. It is of pink to reddish color, equigranular of hypidiomorphic
texture being porphyritic in places. It is composed of plagioclase, quartz, perthite and biotite as the main
constituent minerals.
Petrological and geochemical data assigned the studied granite as monzogranite that exhibits calcalkaline
with weak peraluminous affinity, magmatic nature which is emplaced in within-plate tectonic
environment as A-type granite. Its uranium content is of magmatic origin which is probably leached from
its bearing metamectized zircon. El-Yatima monzogranite is characterized by low fractionated REE pattern
[Av. (La/Lu)n = 1.86] with slight enrichment of LREE [Av. (La/Sm)n = 1.46] relative to approximate flat
HREE [Av. (Gd/Lu)n = 0.93]. The modeled REE data supports the bulk continental crust (B.C.C.) as a
parent source of El-Yatima monzogranite melt which had evolved through 70% partial melting of the parent
source followed by 30% fractional crystallization.

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