Abstract
The intrusive rocks in El Sela area can be arranged from the oldest to the youngest into: two-mica granite and postgranitic dikes which include microgranite, dolerite and bostonite dikes. Zircon is the most abundant accessory mineral. Zircon morphology and geochemical features are good indicators for evolution of rocks. The aim of the work is to determine the morphology, internal structure and chemical composition of zircon to identify the difference of zircon in various intrusive rocks. Results show that morphologically, zircon in the two-mica granite is euhedral coarse- grained with zonation. It is represented by crystals up to 125 µm and corresponds to S10 and P2. Zircon in post-granitic dikes exhibit irregular forms. Geochemically, zircon crystals have higher ZrO2 values in the core whereas HfO2 , UO2 , ThO2 increase at the peripheries of zoned crystals of the two-mica granite. Zircon of two-mica granite contains high HfO2 , UO2 , ThO2 and CaO contents but low Sc2 O3 content. HfO2 is not detected in zircon of microgranite. TiO2 in zircon of two-mica granite and bostonite dikes is under detection limits. REEs are not recorded in zircon of the studied intrusive rocks
Highlights
The Arabian-Nubian Shield (ANS) is an exposure of Precambrian crystalline rocks on the flanks of the Red Sea
– and from north to south – the ANS includes the nations of Jordan, Egypt, Saudi Arabia, Sudan, Eritrea, Ethiopia, Yemen, and Somalia
Tasks are to determine the morphology, internal structure and chemical composition of zircon to identify the difference of zircon in various intrusive rocks
Summary
The Arabian-Nubian Shield (ANS) is an exposure of Precambrian crystalline rocks on the flanks of the Red Sea. The crystalline rocks are mostly Neoproterozoic in age. – and from north to south – the ANS includes the nations of Jordan, Egypt, Saudi Arabia, Sudan, Eritrea, Ethiopia, Yemen, and Somalia. The Arabian-Nubian Shield is believed to be the major exploration frontier in Africa, like West Africa’s mineral exploration boom. The ANS mineral potential has yet to be fully explored and extends into the countries Egypt, Sudan, Eritrea, Ethiopia, Djibouti and Saudi Arabia. It hosts a variety of deposits including mesothermal gold, polymetallic quartz vein and volcanogenic massive sulfide ore deposits. The dominant deposit types are volcanogenic massive sulfide ore deposits and gold quartz vein deposits [1]
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