MINERALOGY GEOCHEMICAL STUDY OF GRANITE ROCKS IN ALAWAINAT MOUNTAIN, SOUTH-EAST OF LIBYA

الملخص

Abstract

This paper discusses the most important characteristics and types of granite rocks in Jabal Alawainat, which is located on the border in southeastern Libya. The study showed the description of four samples manually and petrographic description of eleven microscopic thin sections. The petrographic study of the granite rocks found that there are several types: Granodrite, Porphyry Granite, Red Granite, which is the most recent. The research highlighted the mineral content of these types, supported by a number of microscopic pictures. The study showed an inverse relationship between Silicon oxide and the other oxides: Aluminum, Titanium, Phosphorus, Magnesium Ferric and Calcium oxide, whereas there is a direct proportion between the silicon oxide and the other oxides: Sodium oxide, Potassium, and Manganese oxide. The geochemical study showed that the quality of the magma, which made the granite, was mostly calcite alkaline and far from theoliitic, that means the granite was produced in a continental environment. Because of geochemical exploration, a high percentage of gold is in the study area precipitated in the veins of quartz and many other materials such as oxides of iron, and the region is rich in ornamental stones and economically good.