Open AccessGeological and Tectonic Setting of Andesitic Rock in Central Eastern Desert, Egypt
Author(s) -
AWAD Hamdy Ahmed Mohamed,
ALI Ibrahim Abu El-Leil,
NASTAVKIN Aleksey Valer’evich,
TOLBA Abdellah Sadek,
ABDEL GHANI Mostafa Kamel,
Hassan Ahmed,
GHONEIM Mohamed Mahmoud Fathy,
GAWAD Ahmed El Sayed Abde
Publication year - 2021
Publication title -
izvestiâ uralʹskogo gosudarstvennogo gornogo universiteta
Language(s) - English
Resource type - Journals
eISSN - 2500-2414
pISSN - 2307-2091
DOI - 10.21440/2307-2091-2021-2-7-15
Subject(s) - geology , andesite , petrography , geochemistry , mafic , volcanic rock , lava , lithology , tectonics , plagioclase , basalt , volcano , petrology , quartz , paleontology
Objective. The current study aims to detect the geologic features, geochemical characteristics and tectonic setting of the investigated rock using field observations and geochemical analyses. Research methods. This work contains both field work (Collection samples and drawing of a new geological map) and laboratory work (preparation of thin sections for petrographic studies by polarizing microscope), X-ray Fluorescence analysis (XRF) in Institute of Biology, Southern Federal University and Mass-Spectrometer with Inductively Coupled Plasma (ICPMS) at the central Laboratory of Russian Geological Institute. Result. Investigated andesitic rock belongs to Dokhan volcanic that located in the Central Eastern Desert of Egypt a long Qena-Safaga Road. It is considered as one of the most important shear zones in Eastern Desert that includes distinctive rocks and economic mineral deposits. The investigated rock belongs to late to post tectonic magmatism of the East African Orogeny (EAO). Petrographically: Dokhan volcanic is represented by andesite according to petrographical studies. It consists of plagioclase, quartz, in addition to mafic minerals. Geochemically, the investigated andesite samples plotted in calk-alkaline nature. Conclusion. Tectonically, andesite samples fall in arc lava and continental fields. They are enriched in Ba, Sr, Rb, K, Nb and Ce with marked depletion in the most HFSEs like those of island arc calc-alkaline series.