Hydrothermal evolution of granitoid-hosted gold mineralization in gidami area: An example for orogenic-gold deposits in Egypt

Monsef, Mohamed Abd El; Slobodník, Marek; Salem, Ibrahim A.

doi:10.1016/j.jafrearsci.2018.04.007

Cited by 19 publications

(15 citation statements)

References 31 publications

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“…(4) The mineralization comprises gold-bearing quartz stockworks and veins, sometimes the mineralization is enclosed in aplitic dykes, as in the Gidami gold mine area (Abd El Monsef et al, 2018), diorite porphyry dykes, as in Fig. 5.…”

Section: Characteristics Of Intrusion-related Gold Deposits In Egyptmentioning

confidence: 99%

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Intrusion‐related Gold Deposits in Egypt

Botros

2021

Acta Geologica Sinica (Eng)

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Intrusion‐related gold deposits (IRGDs) occur in the Eastern Desert (ED) of Egypt within magmatic districts that are exploited for tungsten and tin mineralization. IRGDs and intrusion‐related rare metal deposits (IRRMDs) are almost invariably linked with the late to post collisional Younger Granites (YGs) that have three successive phases (I, II and III). At ∼635–630 Ma, the ED underwent a transition in deformation style from compressional to extensional and a switch from subduction with crustal thickening to delamination with crustal thinning. This transition was concurrent with the emplacement of a short magmatic pulse (∼635–630 Ma) that represents a transition between orogenic gold deposits and IRGDs. K‐rich calc alkaline granites (phase I and II of the YGs) hosting IRGDs like the Hangalia deposit were emplaced during the time span 630–610 Ma. Alkaline magmatism began at 610 Ma, coexisting with the K‐rich calc‐alkaline magmatism over the 610–590 Ma time span, where the Fawakhir (598 ± 3 Ma) and Um Had (596 ± 2 Ma) granites that host the IRGDs were emplaced. In time, the alkaline magmatism became more alkaline giving rise to phase III of the YGs that hosts IRRMDs. A distinct metallogenic epoch comprising both IRGDs and IRRMDs, was undergoing extreme growth at ∼600 Ma.

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Section: Characteristics Of Intrusion-related Gold Deposits In Egyptmentioning

confidence: 99%

“…However, the term 'orogenic' gold has been progressively broadened to include deposits that are hosted in late to post-collisional granites (e.g. Gidami gold deposit; Abd El Monsef et al, 2018). Over time, significant ambiguity has become prevalent in defining the boundary between the OGDs and intrusion related gold deposits (IRGDs).…”

Section: Introductionmentioning

confidence: 99%

Intrusion‐related Gold Deposits in Egypt

Botros

2021

Acta Geologica Sinica (Eng)

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“…The emplacement of the Atalla granite seems to have a significant role during the ore formation, which generated the thermal energy required for the metamorphic process and the circulation of hydrothermal currents. Another proposal for the source of gold deposits was that of combined magmatichydrothermal water, where the magmatic fluids were released during the intrusion of granitic masses (Klemm et al, 2001;Botros, 2015;Abd El Monsef, et al 2018b). However, mineralogical evidence (absence of tellurides, molybdenite, rutile, ilmenite and Bi-rich galena) as well as fluid inclusion data for the Atalla Au-Ag deposits do not support any magmatic linkage, implying that this model is not applicable for this kind of deposit.…”

Section: Model Of Mineralizationmentioning

confidence: 99%

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

Monsef

2020

Acta Geologica Sinica (Eng)

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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) ,

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“…Similar models for gold deposition in Egypt and worldwide have been studied for characteristics and conditions of formation for the metamorphic/orogenic gold deposits (Essarraj et al 2001;Uemoto et al 2002;B Zoheir, unpub. PhD thesis, Ludwig-Maximilians-Universität München, 2004;Saravanan & Mishra, 2009;Klein & Fuzikawa, 2010;Zoheir & Lehmann, 2011;Abd El Monsef et al 2018;Abd El Monsef, 2019) (Table 3). Based on the geologic, field relationships and petrographic data, the Haimur area comprises an arcback-arc system that is expressed by obducted ophiolite slices into the island arc metavolcanics (meta-andesite).…”

Section: E Metallogenic Model Of Haimur Gold Depositmentioning

confidence: 99%

“…The possible mixing between metamorphic-magmatic fluids during gold remobilization, transportation, and circulation of hydrothermal water has been discussed by many authors (e.g. Kerrich & Cassidy, 1994;Hassaan & El Mezayen, 1995;Harraz, 2000;Goldfarb et al 2001;Klemm et al 2001;Botros, 2004;Abd El Monsef et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt

Monsef

Abdelnasser

2020

Geol. Mag.

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Abstract The Haimur area represents the central part of the Wadi Allaqi region in the southern block of the Egyptian Eastern Desert near Nasser Lake and the Nile valley. It is made up of ophiolitic assemblage comprising serpentinite and talc carbonate, listwenite, metagabbro/amphibolite and metabasalt and island arc assemblages. The orogenic gold deposits in the Haimur area occur in the form of smoky/white sulphide-bearing quartz / quartz-carbonate veins or lenses cutting through the listwenite zone-related rocks. The NE-trending auriferous veins were formed due to an extensional to transtensional shearing related to NW Najd shear tectonics. Gold was observed in association with late-pyrite and chalcopyrite paragenetically formed in the gold phase (second phase), while the first phase is the sulphide phase including early-pyrite and arsenopyrite. Arsenopyrite was formed during early metamorphic recrystallization at a high-temperature range between 405 and 512 °C. However, gold was formed at lower temperature through retrograde metamorphism. Three types of fluid inclusions have been recognized: aqueous (type-I), mixed aqueous–carbonic (type-II) and hydrocarbonic (type-III). The P–T conditions of trapping were obtained from the isochore lines of intersection between T = 300–320 °C and pressure range of 60–180 MPa. The Haimur gold deposit was supposed to be derived from metamorphic fluids created by dehydration and decarbonation of ophiolitic mélange assemblages and volcano-sedimentary rocks, in which the gold was transported as Au(HS)2– complexes and precipitated in reduced environment. The strong linkage between the deformation and metamorphism triggered gold deposition in structurally favourable sites related to the Najd fault system.

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Hydrothermal evolution of granitoid-hosted gold mineralization in gidami area: An example for orogenic-gold deposits in Egypt

Cited by 19 publications

References 31 publications

Intrusion‐related Gold Deposits in Egypt

Intrusion‐related Gold Deposits in Egypt

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

Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt

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