Abstract
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.
Highlights
The investigated rock is restricted in Qena-Safaga road in the Central Eastern Desert (CED) of Egypt as shown in
Volcanic rocks belong to the (EAO) of Neoproterozoic rocks that related to the (ANS), are divided into three groups
Dokhan volcanics are restricted in the Central Eastern Desert of Egypt on the Qena-Safaga road
Summary
Dokhan volcanics and occur mainly in the northeastern desert and southern Sinai [2, 3] stated that the Hammamate sediments are younger than Dokhan volcanic, while other authors mentioned that the Hammamate sediments were associated with eruption of the Dokhan volcanic as reported by [4]. According to Rb–Sr ages; Dokhan volcanics have 610– 560 Ma, 600–585 Ma for the Hammamate sediments, and younger granites have 610–550 Ma [5]. Dokhan volcanics recognize varicolored and thick sequence of lava flows with their pyroclastics and represented by basalt, basaltic andesite, andesite, rhyolite, rhyodacite and dacite related to their mineral composition (Basta et al, 1980; Stern, Gottfried 1986). Numerous workers have been studied area along QenaSafaga road [6–12]. The examined rock units are represented by Island Arc/back-arc assemblage (Oceanic crust terrain), late to post orogenic (Continental crust terrain) [13]
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