Mineralogy and Geochemistry of Hydrothermally Altered Rocks and Gold Mineralization, at Makhrag El-Ebl area North Eastern Desert, Egypt.

Document Type : Original Article

Authors

1 Geology department, Faculty of Science, Tanta University,Tanta, Egypt

2 Geology department, Faculty of Science, Tanta University, Tanta, Egypt

Abstract

Makhrag El-Ebl area is located in the north Eastern Desert of Egypt. The study area is covered by Pan-African basement rocks which include granodiorites, Dokhan volcanics (dacite), syenogranites and alkali granites. Auriferous quartz veins cut through the granitic and dacitic rocks with development of alteration zones. The quartz veins are massive, white and occasionally stained by iron and copper minerals. They consist mainly of quartz which carries variable amounts of gold, pyrite, native silver, hematite, goethite and barite. The quartz veins display two main trends, NW. and NE. They vary in length from few meters to more than 100 m and in thickness from very thin veinlets to more than 20 cm. The altered granitic and dacitic rocks in the study area were examined using microscopic investigations, XRD, SEM-EDX analyses and whole chemical analyses of major and trace elements. The mineralogical studies accompanied by geochemical analyses for the different alteration zones revealed the existence of eight main facies include: silicification, ferrugination, chloritization, sericitization, argellic, propylitic, carbonatization and muscovite alteration.

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