Transpressional zones in ophiolitic mélange terranes: Potential exploration targets for gold in the South Eastern Desert, Egypt

Zoheir, Basem

doi:10.1016/j.gexplo.2011.07.003

Cited by 53 publications

(26 citation statements)

References 56 publications

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“…Formation of the NNW-trending, sinistral shear zones in the Wadi El Beida-Wadi Khashab area is attributed to a regional NNW-SSE folding and transpression (D2), during which extensive shear zones and conjugate fault systems were developed. The mineralized shear zones in the study area are part of the high-angle convergent wrench structure, namely Wadi Kharit-Wadi Hodein zone (e.g., Abdeen et al, 2008;de Wall et al, 2001;Greiling et al, 1994;Zoheir, 2011). Spatial association of the investigated auriferous shear zones and regional convergent structures is typical for the orogenic, lodegold setting (e.g., Goldfarb et al, 2001;Huston et al, 2007).…”

Section: Discussionmentioning

confidence: 97%

“…Gold-bearing quartz veins are widespread in south Eastern Desert of Egypt, commonly showing spatial and temporal association with shear zones (e.g., Kusky and Ramadan, 2002;Zoheir, 2008Zoheir, , 2011. Abundant remnants of ancient gold mining on both flanks of the Wadi El Beida and Wadi Khashab, including stopped-out quartz veins and tailings, and stone huts likely date back to the Arab times (i.e.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lode-gold mineralization in convergent wrench structures: Examples from South Eastern Desert, Egypt

Zoheir

2012

Journal of Geochemical Exploration

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Lode-gold mineralization in convergent wrench structures: Examples from South Eastern Desert, Egypt

Zoheir

2012

Journal of Geochemical Exploration

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“…These quartz veins are mostly accompanied by abundant pyrite and arsenopyrite. The distribution of gold-bearing quartz veins is controlled by major faults (e.g., Loizenbauer and Neumayr 1996;Helmy et al 2004;Zoheir 2008a;Zoheir 2011) mostly related to NW-or NNW-striking shear zones that generally reflect reactivated older accretionary sutures (e.g., Kusky and Ramadan 2002;Zoheir 2008a, b).…”

Section: Introductionmentioning

confidence: 99%

Nature and Geodynamic Setting of Late Neoproterozoic Vein-Type Gold Mineralization in the Eastern Desert of Egypt: Mineralogical and Geochemical Constraints

Khalil

Moghazi

Makky

2016

Mineral Resource Reviews

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The vein-type gold mineralization in the Eastern Desert of Egypt consists of sulphide minerals in stockwork quartz veins with hydrothermal alteration zones. The veins cut Neoproterozoic rocks along contacts between granite intrusions and island arc metavolcano-sedimentary sequence and ophiolitic rocks. Mineralization shows a clear structural control and is thus classified as orogenic gold. A post-peak metamorphic origin for the deposition of gold, sulphides, and carbonate gangue in the veins is suggested on the basis of various observations, such as: (1) gold mineralization is confined to quartz-bearing shear zones that cut host metamorphic rocks; (2) many sulphide minerals such as pyrite and arsenopyrite in addition to native gold and carbonate occur in different generations and parageneses; several of the sulphide generations are formed as a result of sulphidization of pre-existing metamorphic rocks; and (3) the depositional temperature of the hydrothermal minerals is commonly less than 400°C. Based on relationships to magmatism and geodynamic framework, the gold deposits formed during the post-collision stage (*640-590 Ma) of Neoproterozoic crustal evolution. Major and trace elements data for 848 gold-mineralized samples of host rocks and quartz veins are treated statistically utilizing multivariate methods including discriminant function and R-mode factor analyses. From the geochemical exploration point of view, the Au-mineralized alteration zones developed within granitoids and schists are the most

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“…Late deformation included the occurrence of lateral escape tectonics along transtensional or transpressional systems during the final stages of orogeny (Burke and Sengör 1986;Stern et al 1989;Kröner et al 1992;Miller and Dixon 1992;Stern 1994;de Wall et al 2001;Johnson et al 2011). The distribution of gold as well as base-metal sulfide occurrences in the Eastern Desert of Egypt is controlled by major wrench faults and shear zones (Loizenbauer and Neumayr 1996;Helmy et al 2004;Zoheir 2008a, b, c;Zoheir 2011). Gold deposits across the southern part of the Eastern Desert are mostly related to NW-or NNW-striking shear zones generally reflecting reactivated earlier accretionary suture zones (Kusky and Ramadan 2002;Zoheir 2008aZoheir ,b, 2011.…”

Section: Introductionmentioning

confidence: 99%

Controls on quartzite bearing base-metal sulfide and invisible gold mineralization at Gabal Abu Houdied area, South Eastern Desert, Egypt

et al. 2014

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The Neoproterozoic basement rocks cropping out in the Gabal Abu Houdied (GAH) area comprises mainly three lithotectonic assemblages; mafic-ultramafic ophiolitic rocks, island arc-related metasediment-metavolcanic rocks and syn-and post-tectonic intrusions. The base-metal sulfide and invisible gold mineralization are restricted to quartzites, which are considered as member of island arc-related metasediment rocks. The mineralized quartzite rocks are cropped out at three localities, at Wadi El Haussioum where cover a small area (0.25 km 2 ), at Bir Abu Houdeid, cover small area (0.5 km 2 ), and at Bir Shani (3.5 km long with different width ranging from 4 to 75 m). Based on textural characteristics and chemical features, documented by electron probe microanalysis (EPMA) and inductively coupled plasma mass spectrometry analyses (ICP-MS), two phases of sulfide minerals assemblages in the investigated quartzites of GAH area. An early mineralization phase includes pyrite, pyrrhotite, argentite (acanthite) and invisible gold, and the late phase, dominated by pyrite, galena, sphalerite, chalcopyrite, covelite, and±invisible gold. Analyses of the structural data collected from the quartzite rocks and surroundings indicated that the base-metal sulfide and associated gold mineralization in the GAH area are mostly controlled by D3 transperssional deformation event. This event is main Hamisana shear zone (HSZ) deformation event and characterized by transperssional stress regime, with σ1 trending E-W and σ3 trending N-S governed conjugate NNW sinistral and NNE-SSW dextral strike slip faulting.

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Transpressional zones in ophiolitic mélange terranes: Potential exploration targets for gold in the South Eastern Desert, Egypt

Cited by 53 publications

References 56 publications

Lode-gold mineralization in convergent wrench structures: Examples from South Eastern Desert, Egypt

Lode-gold mineralization in convergent wrench structures: Examples from South Eastern Desert, Egypt

Nature and Geodynamic Setting of Late Neoproterozoic Vein-Type Gold Mineralization in the Eastern Desert of Egypt: Mineralogical and Geochemical Constraints

Controls on quartzite bearing base-metal sulfide and invisible gold mineralization at Gabal Abu Houdied area, South Eastern Desert, Egypt

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