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Accueil du site → Doctorat → Egypte → GEOLOGICAL, MINERALOGICAL AND GEOCHEMICAL STUDIES OF URANIFEROUS GRANITES from ABU HADEDAH AREA, NORTHERN EASTERN DESERT, EGYPT

Menoufiya University (2020)

GEOLOGICAL, MINERALOGICAL AND GEOCHEMICAL STUDIES OF URANIFEROUS GRANITES from ABU HADEDAH AREA, NORTHERN EASTERN DESERT, EGYPT

SAKER,RANIA MOHAMED AMIN

Titre : GEOLOGICAL, MINERALOGICAL AND GEOCHEMICAL STUDIES OF URANIFEROUS GRANITES from ABU HADEDAH AREA, NORTHERN EASTERN DESERT, EGYPT

Auteur : SAKER,RANIA MOHAMED AMIN .

Etablissement de soutenance : Menoufiya University.

Grade : Doctor of Philosophy in Geology 2020

Résumé partiel
The present study deals with the geological, geochemical and mineralogical studies of uraniferous granites from Abu Hadedah area which locates in the southern part of the Northern Eastern Desert. The studied area is bounded by longitudes 33o 44` 06``and 33o 47` 42`` E and latitudes 26o 42` 54``and 26o 45` 36``N. The area covers about 26 km2 and occupied by Precambrian basement suites. Field investigation shows that the exposed rock units are represented by older granitoids, younger gabbros, younger granites moreover basic and acidic dykes. The older granitoids ranges from quartz-diorite– tonalites – granodiorites followed by younger granite monzogranites and alkali-feldspar granite with emphasis on the microgranite offshoots as a target of study. The microgranite offshoots occur as swarms of abnormal radioactivity and poly mineralization. They are restricted in a highly deformed, faulted, sheared narrow zone. They are equigranular, fine grained rocks, compact and silicified in some areas. They show color varying from buff, pink, dark red and brown. Microscopically, they consist of K-feldspar, quartz and plagioclase together with subordinate biotite and muscovite. Zircon, fluorite and apatite are accessories. Also, secondary uranium minerals are recorded in some sample such as uranophane and kasolite. They show highly alteration processes such as hematitization, silicification, kaolinization, sericitization and carbonization that are affecting on the rocks with different degrees of intense.. The geochemical investigations of the studied microgranite offshoots samples revealed that they plot in the granites field and they evolved from magma with subalkaline characters. The uraniferous granites from Abu Hadedah plot in the high K-calc alkaline field. The studied samples lie in the peraluminous field belong to Atype granite. The microgranite offshoots are enriched in rare metals (Zr, Y, Nb and Hf) and alkali earths such as Ba and Sr. Similarly, the heavy metals ; Pb and Zn, increase. The alteration improves the total REE budget, but with preferential enrichment of the HREE over the LREE. In light of the uraniferous microgranites,. it is found that the area have background values higher than the corresponding Clark value, it was also observed that, U, Th, Nb, Pb, Y and Zr have abnormal contents. These dykes hosting or acting as a source for uranium, and heavy rare earths mineralization. They could be used to delineate the most suitable locations for the surface and probable hidden mineralization

Présentation étendue (EULC)

Page publiée le 1er avril 2020