Serpentinite-hosted talc–magnesite deposits of Wadi Barramiya area, Eastern Desert, Egypt: Characteristics, petrogenesis and evolution

Ali‐Bik, Mohamed W.; Taman, Zeinab; Kalioubi, Baher El; Wahab, Wael Abdel

doi:10.1016/j.jafrearsci.2011.11.002

Cited by 45 publications

(9 citation statements)

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“…The Neoproterozoic shield rocks of the western part of the CED is dominated by dismembered ophiolites, tectonic mélange of allochthonous blocks of serpentinite incorporated and intermixed with an intensively deformed pelitic and calcareous schists, locally with intercalations of quartzite and black marble bands [42]. In the Barramiya-Mueilha sector (Figure 1), serpentinite represents greenschist facies metamorphosed cumulus ultramafic rocks of an ophiolite sequence [43][44][45][46]. The island arc metavolcanic rocks in the study area ( Figure 1) comprise metabasalt, basaltic meta-andesite, interbedded with dactic tuffs and agglomerate, with accidental carbonate fragments.…”

Section: Geologic Settingmentioning

confidence: 99%

Orogenic Gold in Transpression and Transtension Zones: Field and Remote Sensing Studies of the Barramiya–Mueilha Sector, Egypt

et al. 2019

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Multi-sensor satellite imagery data promote fast, cost-efficient regional geological mapping that constantly forms a criterion for successful gold exploration programs in harsh and inaccessible regions. The Barramiya–Mueilha sector in the Central Eastern Desert of Egypt contains several occurrences of shear/fault-associated gold-bearing quartz veins with consistently simple mineralogy and narrow hydrothermal alteration haloes. Gold-quartz veins and zones of carbonate alteration and listvenitization are widespread along the ENE–WSW Barramiya–Um Salatit and Dungash–Mueilha shear belts. These belts are characterized by heterogeneous shear fabrics and asymmetrical or overturned folds. Sentinel-1, Phased Array type L-band Synthetic Aperture Radar (PALSAR), Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER), and Sentinel-2 are used herein to explicate the regional structural control of gold mineralization in the Barramiya–Mueilha sector. Feature-oriented Principal Components Selection (FPCS) applied to polarized backscatter ratio images of Sentinel-1 and PALSAR datasets show appreciable capability in tracing along the strike of regional structures and identification of potential dilation loci. The principal component analysis (PCA), band combination and band ratioing techniques are applied to the multispectral ASTER and Sentinel-2 datasets for lithological and hydrothermal alteration mapping. Ophiolites, island arc rocks, and Fe-oxides/hydroxides (ferrugination) and carbonate alteration zones are discriminated by using the PCA technique. Results of the band ratioing technique showed gossan, carbonate, and hydroxyl mineral assemblages in ductile shear zones, whereas irregular ferrugination zones are locally identified in the brittle shear zones. Gold occurrences are confined to major zones of fold superimposition and transpression along flexural planes in the foliated ophiolite-island arc belts. In the granitoid-gabbroid terranes, gold-quartz veins are rather controlled by fault and brittle shear zones. The uneven distribution of gold occurrences coupled with the variable recrystallization of the auriferous quartz veins suggests multistage gold mineralization in the area. Analysis of the host structures assessed by the remote sensing results denotes vein formation spanning the time–space from early transpression to late orogen collapse during the protracted tectonic evolution of the belt.

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Section: Geologic Settingmentioning

confidence: 99%

Orogenic Gold in Transpression and Transtension Zones: Field and Remote Sensing Studies of the Barramiya–Mueilha Sector, Egypt

et al. 2019

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“…1). Characteristically, they exhibit cavernous structure due to the differential weathering on both competent (ultramafic nodules) and relatively soft components (Ali-Bik et al 2012) and are dissected by magnesite and calcite veinlets. These rocks are tectonically thrusted over the surrounding schistose metavolcanics, while they are intruded by tonalite-granodiorite and gabbro-diorite.…”

Section: General Geological Settingmentioning

confidence: 99%

“…The Pan-African ophiolitic serpentinites of the Eastern Desert of Egypt represent slices of old oceanic crust that were evolved in a back-arc setting and obducted onto island arc (s) successions, forming zones of major thrust faults (e.g., El Sharkawy and El Bayoumi 1979; Ries et al 1983;El Gaby et al 1988, 1990Sultan et al 1986;Shackleton 1994;Ali-Bik et al 2012;El-Desoki et al 2015). In such tectonostratigraphic column, the ophiolitic serpentinites form elongated ranges of folded tabular bodies or sheets, demarcating conspicuous brittle-ductile shear zones (El Gaby et al 1988, 1990Sadek 2001;Ali-Bik et al 2012).…”

Section: Serpentinitesmentioning

confidence: 99%

“…In such tectonostratigraphic column, the ophiolitic serpentinites form elongated ranges of folded tabular bodies or sheets, demarcating conspicuous brittle-ductile shear zones (El Gaby et al 1988, 1990Sadek 2001;Ali-Bik et al 2012).…”

Section: Serpentinitesmentioning

confidence: 99%

“…2000;Ramadan et al 2001;Kusky and Ramadan 2002;Ferrier et al 2002;Crosta and Filho 2003;Ramadan and Kontny 2004;Liu et al 2007;Zhang et al 2007;Gabr et al 2010). Remotely sensed processed data including ETM and ASTER have been used by many workers (e.g., Sultan et al 1986;Loughlin 1991;Rokos et al 2000;Abdelsalam and Stern 2000;Ramadan et al 2001;Kusky and Ramadan 2002;Ferrier et al 2002;Crosta and Filho 2003;Sadek 2004Sadek , 2005Ninomiya et al 2005Ninomiya et al , 2006Gad and Kusky 2007;Hasan 2009, 2012a, b;Liu et al 2007;Zhang et al 2007;Amer et al 2010;Gabr et al 2010;Aboelkhair et al 2010;Ali-Bik et al 2012;Abou Elmagd et al 2013;Rajendran et al 2013;Asran et al 2013;Hassan and Ramadan 2014;. None of these studies used the interpreted data of Landsat 8 images in geological studies in the Central Eastern Desert of Egypt.…”

Section: Introductionmentioning

confidence: 99%

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Late Neoproterozoic basement rocks of Kadabora-Suwayqat area, Central Eastern Desert, Egypt: geochemical and remote sensing characterization

2015

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Kadabora-Suwayqat area, in the Central Eastern Desert of Egypt, is built up by a wide variety of non-consanguineous, basement rock units, which represent a tectonostratigraphic suite within the frame of the Late Neoproterozoic, Pan-African Arabian-Nubian Shield. They were developed from different magma sources at varied tectonic settings through subsequent tectono-magmatic processes. They cover a wide compositional range of the Pan-African legend in the Eastern Desert of Egypt comprising ophiolitic, island-arc, and within-plate assemblages. The ophiolitic serpentinites were obducted onto arcrelated metavolcanics and intruded by gabbroic and syn-late to post tectonic granitoids. Geochemically, the precursor of the ophiolitic serpentinites seems to be peridotite (harzburgite). The basic, intermediate, and acidic metavolcanics imply a transitional stage between an island-arc and a proper active continental margin setting. They exhibit with the gabbroic rocks a diagnostic subduction-related island-arc, calc-alkaline affinity. The granitoids comprise both arc-related, calc-alkaline I-type and within-plate, anorogenic A-type varieties. These rocks have been successfully discriminated on Landsat 8 images including Minimum Noise Fraction (MNF; 4, 3, 7), Principal Component Analysis (PCA; PC6, PC2, PC7), and various band ratios (b6/ b2, b6/b7, b6/b5×b4b5) and (b7/b6, b7/b5, b5/b3). ASTER clay index (5×7/6) and silica index (10/13) discriminated the granitoid rocks, while the serpentinite-talc carbonate and metavolcanic rocks are distinguished on the ASTER images of amphibole index (6+9/7+8) and (6/8).

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Volcanogenic talc‐copper deposits of Darhib‐Abu Jurdi area, Egypt: Petrogenesis and remote sensing characterization

2020

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Economic talc deposits were developed as an integral part of a volcanogenic massive sulfide system in Darhib‐Abu Jurdi bimodal‐mafic type submarine volcanics in the South Eastern Desert of Egypt. These Pan‐African metavolcanics were erupted in a rift‐related environment and experienced low‐grade greenschist metamorphism. They host talc‐malachite mineralization, mainly within E–W trending alteration zones along the major latitudinal shear planes. These mineralized alteration zones contain economic talc deposits as well as averages of 1.7% Cu and 0.46% Zn; the maximum may exceed 11% Cu. Sentinel‐2, ASTER, and Landsat‐8 dataset in conjunction with a portable TerraSpec Halo mineral identifier device (ASD) were employed in detecting and mapping these mineralized alteration zones within the Darhib‐Abu Jurdi metavolcanics. Petrography, mineralogy, and geochemistry of these deposits and host volcanics enabled to put constraints on their petrogenesis and evolution as a submarine hydrothermal vent system. Mineralogical characteristics of pervasive chloritization stringer zone, hypogene primary sulfide ore zone, and supergene oxidized zone are addressed and discussed. Talc deposits were formed at Darhib‐Abu Jurdi area as the main gangue phase via (a) direct precipitation on seafloor by interaction of silica‐saturated hydrothermal fluids with Mg‐rich seawater, (b) precipitation with actinolite/tremolite at shallow depth beneath the sulfide ore lenses due to penetration of Mg‐rich seawater into hydrothermal conduit, and (c) replacement of pre‐existing tremolite, actinolite, chlorite, and septechlorite.

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Serpentinite-hosted talc–magnesite deposits of Wadi Barramiya area, Eastern Desert, Egypt: Characteristics, petrogenesis and evolution

Cited by 45 publications

References 8 publications

Orogenic Gold in Transpression and Transtension Zones: Field and Remote Sensing Studies of the Barramiya–Mueilha Sector, Egypt

Orogenic Gold in Transpression and Transtension Zones: Field and Remote Sensing Studies of the Barramiya–Mueilha Sector, Egypt

Late Neoproterozoic basement rocks of Kadabora-Suwayqat area, Central Eastern Desert, Egypt: geochemical and remote sensing characterization

Volcanogenic talc‐copper deposits of Darhib‐Abu Jurdi area, Egypt: Petrogenesis and remote sensing characterization

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