GEOLOGY, GEOCHEMISTRY AND RADIOACTIVITY OF THE MONZOGRANITE ROCKS, NORTH WADI GHADIR, SOUTH EASTERN DESERT, EGYPT

Document Type : Original Article

Authors

Nuclear Materials Authority,Cairo, Egypt

Abstract

Wadi Ghadir area show different types of the basement rocks such as; ophiolitic mélange, metabasalt,
quartz-diorite, granodiorite and monzogranite. The fresh monzogranite suffered in elsewhere alteration
processes and rich in sulphide minerals. The studied monzogranite has peraluminous character, alkaline
affinity, emplaced in within plate setting and crystallized under low water vapour pressure (2-3Kb) and
temperature (760-800oC). The propylitic and K-metasomatism are the main alteration types in the studied
altered monzogranite, while plagioclase destructed and formed epidote. The identified heavy minerals are
mostly pyrite, sphalerite, galena, monazite, hematite and goethite.
Mineral chemistry by EPMA analyses exhibit that pyrite mineral is rich in Co and Se and low values
of Mn and Cu.
The radioactivity increases toward the more acidic rocks, from granodiorite to altered monzogranite.
The average eU content indicates that the fresh monzogranite is not uraniferous, while the altered
monzogranite is uraniferous.

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