Ore Controls and Metallogenesis of Au‐Ag Deposits at Atalla Mine, Central Eastern Desert of Egypt

Abstract

The tectonic evolution of the ANS can be described by three major successive stages: 1) subduction stage (~850-635 Ma), characterized by island arc volcanics, volcanosedimentary assemblages and metagabbro-diorite intrusive rocks, (2) continental orogeny stage (~635-590 Ma), characterized by transitional magmatism of calc-alkaine intrusions, tectonic escape and extension, and (3) postcollision stage (590-540 Ma), characterized by emplacement of fresh gabbro and alkaline granitic masses (Khalil et al., 2016 and references contained therein). The basement rocks in the ED occur as an elongated belt 800 km long, parallel to the Red Sea coast, comprising a series of intra-oceanic island arcs, oceanic islands, obducted oceanic lithosphere, continental plutons and molasse-type sediments. The basement belt outcrops from the Ras Gharieb area in the north to the Egypt-Sudan border in the south, hosting more than a hundred widelydistributed gold occurrences in Egypt (Fig. 1b). There are three main models for the genetic evolution of gold in Egypt: 1) orogenic gold related to hydrothermal activity, which is either derived from pure metamorphic or combined metamorphic-magmatic sources (e.g. Gidami (12) ,

Source of Raw Materials and Its Processing for the Manufacturing of Ptolemaic Faience Bowls from Tell Atrib (Nile Delta, Egypt)

“…Mineralization accompanying the quartz veins is comparable to the hydrothermal mineralization of the gold-bearing quartz veins on the Eastern Desert in Egypt [50]. The primary mineralization accompanying the gold-bearing quartz veins comprises mostly magnetite, ilmenite, pyrite, chalcopyrite, sphalerite and galena [51,52]. Moreover, cobaltine and tetrahedrite can also appear [53,54].…”

“…The most important minerals, considered as proxies, include tetrahedrite belonging to Cu sulfosalts and cobaltite belonging to As sulfosalts [53,56,57,63]. Ni and Co played a crucial role in the selection as admixtures, as well as sphalerite, pyrite and arsenopyrite [51,52,63,72,74].…”

Multisource Data Analysis for Gold Potentiality Mapping of Atalla Area and Its Environs, Central Eastern Desert, Egypt

“…Syn-to late tectonic granitoids include Atalla granite (coarse-grained granodiorite), which is located at the central part of the study area with NW-SE extension, and the oval-shaped Fawakhir granite (mostly mylonitized tonalite) at the southern part of the study area and exhibiting the same extension. Following NW-SE ASZ, Dokhan volcanics are represented by foliated tuffs of wide composition )felsite, dacite, andesite, and basalt) [15] at the western part of the area and between Fawakhir serpentinites and Hammamat clastics.…”

Neoproterozoic Tectonic Events of Egypt

“…Kamal El Din et al, 1992). Oblique convergence transpression, whether dextral or sinistral, is a proposed mechanism adopted by many authors (Fritz et al, 1996;Loizenbauer et al, 2001;Makroum, 2001;Bregar et al, 2002;Shalaby et al, 2005;Abd El-Wahed, 2008, 2010Shalaby, 2010;Kamh, 2010, 2013;Zoheir and Lehmann, 2011;Zoheir and Weihed, 2014;Abd El-Wahed et al, 2016Abd El-Wahed and Thabet, 2017;Makroum, 2017;Hamdy et al, 2017;Stern, 2017;Zoheir et al, 2019;Hamimi et al, 2019;Abd El Monsef, 2020;Abd El-Wahed and Hamimi, 2021a and b;Abd El-Wahed et al, 2021) to explain and imply the deformation styles in the Eastern Desert.…”