The northern dome of Wadi Hafafit culmination, Eastern Desert, Egypt: Structural setting in tectonic framework of a scissor-like wrench corridor

Shalaby, Ahmed

doi:10.1016/j.jafrearsci.2009.08.003

Cited by 40 publications

(32 citation statements)

References 41 publications

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“…Habib et al 1985;El-Gaby et al 1990;Bregar et al 2002;Shalaby 2010), and (ii) the structurally overlying 'suprastructure' nappe assemblage, which includes back-arc ophiolites, island arc metavolcanic and metasedimentary assemblages, as well as non-to weakly-metamorphosed cal-alkaline volcanic rocks (Dokhan Volcanics) and molassetype sedimentary rocks (Hammamat Sediments) unconformably on top (e.g. Shackleton et al 1980;El-Gaby et al 1990;El-Sayed et al 1999;Abd El-Rahman et al 2009).…”

Section: Regional Geological Settingmentioning

confidence: 99%

Fluid evolution in the El-Sid gold deposit, Eastern Desert, Egypt

Zoheir

Moritz

2014

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Auriferous quartz (+carbonate) veins in the El-Sid mine cut through the western margin of the Fawakhir granitic intrusion and the immediate country ophiolites. Gold mineralization is spatially and temporally associated with ENE-WSW fault/shear zones developed late in the deformational history of the area. Field and microscopic studies suggest two distinct ore stages; namely an early gold-Fe-As-sulphide, and a late gold-base metal mineralization. New microthermometric and Raman data suggest gold deposition as a result of a complex history of fluid immiscibly, dilution of low-salinity aqueous-carbonic fluids in the early mineralization stage, while wall-rock alteration and pressure loss precipitated Au from intermediate-salinity aqueous ore fluids during the late stage. Fluid inclusion isochoric reconstructions, combined with oxygen and sulphur isotope data, indicate conditions of 320 + 20 8C and 1.3 + 0.2 kbar for the early gold-Fe-As-sulphide mineralization, and c. 200 + 15 and 0.6 + 0.9 kbar for the late gold-Zn-Pb-Cu-sulphide stage. The clockwise evolution path in pressure-temperature space likely documents gold mineralization under post-peak metamorphic conditions. The calculated sulphide d 34 S H2S equilibrium values 29.04‰ to -4.75‰, may refer to a variable redox state of sulphur in the ore fluids from the early to late mineralization stages. The stable isotope signature of the vein quartz and calcite suggest mixed magmatic and metamorphic fluid sources (d 18 O H2O ¼ +4.9‰ to +7.4‰). Unusually low d 13 C values of calcite in the late mineralization (213.9‰ to 214.7‰) may reflect input of magmatic CO 2 and/or oxidized carbonaceous material in the infiltrating fluid.

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Section: Regional Geological Settingmentioning

confidence: 99%

Fluid evolution in the El-Sid gold deposit, Eastern Desert, Egypt

Zoheir

Moritz

2014

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“…It could represent the conjugate fault set to the main northwest-trending Najd shear system as commonly observed in the ANS (Moore 1979;Greiling et al 1994;Johnson and Woldehaimanot 2003;Shalaby 2010). Alternatively, the dextral fault system could be much younger in age.…”

Section: Introductionmentioning

confidence: 99%

Structural Controls on Groundwater Flow in Basement Terrains: Geophysical, Remote Sensing, and Field Investigations in Sinai

et al. 2015

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An integrated [very low frequency (VLF) electromagnetic, magnetic, remote sensing, field, and geographic information system (GIS)] study was conducted over the basement complex in southern Sinai (Feiran watershed) for a better understanding of the structural controls on the groundwater flow. The increase in satellite-based radar backscattering values following a large precipitation event (34 mm on 17-18 January 2010) was used to identify water-bearing features, here interpreted as preferred pathways for surface water infiltration. Findings include: (1) spatial analysis in a GIS environment revealed that the distribution of the water-bearing features (conductive features) corresponds to that of fractures, faults, shear zones, dike swarms, and wadi networks; (2) using VLF (43 profiles), magnetic (7 profiles) techniques, and field observations, the majority (85 %) of the investigated conductive features were determined to be preferred pathways for groundwater flow; (3) northwest-southeast-to north-south-trending conductive features that intersect the groundwater flow (southeast to northwest) at low angles capture groundwater flow, whereas northeast-southwest to east-west features that intersect the flow at high angles impound groundwater upstream and could provide potential productive well locations; and (4) similar findings are observed in central Sinai: east-west-trending dextral shear zones (Themed and Sinai Hinge Belt) impede south to north groundwater flow as evidenced by the significant drop in hydraulic head (from 467 to 248 m above mean sea level) across shear zones and by reorientation of regional flow (south-north to

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“…Wrench-dominated transpression, a characteristic feature of obliquely convergent mobile belts, has been suggested to explain the complex deformation kinematics in the Eastern Desert of Egypt (e.g., Abd El-Wahed, 2008;Abd El-wahed and Kamh, 2010;Abdeen et al, 2008;Fritz et al, 1996;Fritz et al, 2002;Greiling et al, 1994;Loizenbauer et al, 2001;Makroum, 2001;Shalaby, 2010;Shalaby et al, 2005;Wallbrecher et al, 1993). In south Eastern Desert of Egypt, discrete NW-to NNW-trending, kilometer-scale, shear zones cutting the ophioltic and island arc metavolcanic/volcaniclastic assemblages in the Wadi El Beida-Wadi Khashab district are likely related to the ca.…”

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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The northern dome of Wadi Hafafit culmination, Eastern Desert, Egypt: Structural setting in tectonic framework of a scissor-like wrench corridor

Cited by 40 publications

References 41 publications

Fluid evolution in the El-Sid gold deposit, Eastern Desert, Egypt

Fluid evolution in the El-Sid gold deposit, Eastern Desert, Egypt

Structural Controls on Groundwater Flow in Basement Terrains: Geophysical, Remote Sensing, and Field Investigations in Sinai

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

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