Precambrian Basement Complex of Egypt

El-Bialy, Mohammed Z.

doi:10.1007/978-3-030-15265-9_2

Cited by 63 publications

(19 citation statements)

References 220 publications

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“…Also, the calc-alkaline granites of the YG are characterized by higher Eu/Eu* values (0.5-1), giving rise to shallow negative anomalies. The alkaline granites appear to be differentiated from the calc-alkaline granitoids by higher RREE and much lower Eu/Eu* values [50].…”

Section: Geochemical Characteristicsmentioning

confidence: 92%

An Overview on the Classification and Tectonic Setting of Neoproterozoic Granites of the Nubian Shield, Eastern Desert, Egypt

Bahariya¹

2021

Geochemistry

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Granites constitute the main rock components of the Earth’s continental crust, which suggested to be formed in variable geodynamics environments. The different types of granitic rocks, their compositional characteristics, tectonic settings and magma sources are outlined. Mineralogical classification of granites includes four rock types: tonalites, granodiorites, granite (monzogranite and syenogranites) and alkali-feldspar granites. Alphabetical classification subdivided granites into: I-type, S-type, A-type and M-type granites. Moreover, formation of granitic magmas requires distinctive geodynamic settings such as: volcanic arc granite (Cordilleran); collision-related granites (leucogranites); intra-plate and ocean ridge granites. The Eastern Desert of Egypt (ED) forms the northern part of Nubian Shield. Both older and younger granites are widely exposed in the ED. Old granites (OG) comprise tonalites and granodiorites of syn- to late-orogenic granitoid assemblages. They are calcalkaline, I-type, metaluminous and display island arc tectonic setting. Younger granites (YG) on the other hand, include granites, alkali-feldspar granites and minor granodiorites. They are of I- and A-type granites and of post-orogenic to anorogenic tectonic settings. The majority of the YG are alkaline, A-type granite and of within-plate tectonic setting (WPG). The A-type granites are subdivided into: A2-type postorogenic granites and A1-type anorogenic granites. Granite magma genesis involves: (a) fractional crystallization of mafic mantle-derived magmas; (b) anatexis or assimilation of old, upper crustal rocks (c) re - melting of juvenile mafic mantle – derived rocks underplating the continental crust. Generally, older I-type granitoids were interpreted to result from melting of mafic crust and dated at approximately 760–650 Ma, whereas younger granites suggested to be formed as a result of partial melting of a juvenile Neoproterozoic mantle source. Moreover, they formed from anatectic melts of various crustal sources that emplaced between 600 and 475 Ma.

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Section: Geochemical Characteristicsmentioning

confidence: 92%

An Overview on the Classification and Tectonic Setting of Neoproterozoic Granites of the Nubian Shield, Eastern Desert, Egypt

Bahariya¹

2021

Geochemistry

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“…The transmissivity values reflect high aquifer yields, and it varied between 1103.7 and 1459.7 m 2 /day with an average 1314.9 m 2 /day. These characteristics have been discussed in detail in the work by Abdalla et al [23], Abdalla and Moubark [22] and El-Rawy et al [31].…”

Section: Study Areamentioning

confidence: 97%

Groundwater potential mapping using GIS, linear weighted combination techniques and geochemical processes identification, west of the Qena area, Upper Egypt

Abdalla

Moubark

Abdelkareem

2020

Journal of Taibah University for Science

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The water demand in Egypt has risen due to limited surface water and varied uses. Geological and hydrological data, radar, optical remote sensing data, and Geographic Information System techniques delineate groundwater availability zones in the study area. Thematic layers (lithology, topography, slope, stream networks, lineaments, and rainfall) were integrated into the ArcGIS 10.4 using a linear weighted combination technique. The final groundwater prospective zones (GWPZ) map revealed six zones, very low, low, moderate, high, very high, and excellent, covering areas of 7.49%, 14.93%, 3.74%, 28.88%, 37.30%, and 7.62%, respectively. The GWPZ map was tested and compared to the abstraction rates, locations of existing wells, and thickness of the water-bearing formations. NDVI analysis revealed an increase in the area's vegetation from 1984 to 2017. Geochemical analyses of 43 groundwater samples revealed water-rock interactions, ion exchange, evaporation, and the influence of irrigation-return flows as prominent processes influencing ion enrichment of the groundwater.

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“…They were derived from an old sedimentary succession intercalated by basic igneous sills (ortho-amphibolites), marls (paraamphibolites) and quartzite layers. The sedimentary sequence was accumulated along a passive continental margin and then subjected to high-T and low-P regional metamorphism up to the upper amphibolite facies (Abd El -Wahed et al, 2016Hamimi et al, 2019;Fowler and Hamimi, 2020;Hamimi and Abd El-Wahed, 2020;Stern and Ali, 2020;El-Bialy, 2020). The gneisses and migmatites occur as antiforms and domed structures in the ENS (e.g.…”

Section: High-grade Gneisses and Migmatitesmentioning

confidence: 99%

“…CTB, Congo-Tanzania Cratons. El-Naby et al, 2008;Andresen et al, 2009Andresen et al, , 2010Lundmark et al, 2012;Ali et al, 2012;Hamdy et al, 2017;Makroum, 2017;Hamimi and Abd El-Wahed, 2020;El-Bialy, 2020;El Kalioubi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…However, other studies indicated that these gneiss complexes were formed along one or more magmatic arcs in intra-oceanic or continental arc settings along the western margin of the Mozambique Ocean prior to amalgamation of East and West Gondwana at ~630 Ma (e.g. El-Ramly et al, 1984Greiling et al, 1984Greiling et al, , 1988Stern, 1994;Abd El-Wahed, 2008Andresen et al, 2009Andresen et al, , 2010Abd El-Wahed and Kamh, 2010;Augland et al, 2012, Lundmark et al, 2012Ali et al, , 2010aAli et al, , b, 2012Ali et al, , 2015Abd El-Wahed et al, 2016Hamimi et al, 2019;Fowler and Hamimi, 2020;Hamimi and Abd El-Wahed, 2020;El-Bialy, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Neoproterozoic Tectonic Events of Egypt

El‐Wahed

Hamimi

2021

Acta Geologica Sinica (Eng)

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The Egyptian Nubian Shield (ENS) represents the northwestern part of the Arabian‐Nubian Shield and the northern extension of the East African Orogen. The ENS is regarded as being formed due to northward‐directed escape tectonics. It is characterized by mild accretion and suture zones dominated by major strike‐slip zones with a commonly sinistral sense of movement; some shear zones display a dextral sense of shear. It is dominated by gneisses and migmatites in the south, arc volcaniclastic metasediments and highly dismembered ophiolites in the central parts, whereas its northern part is dominated by late‐ to post‐tectonic granitoids. In southern Sinai, the Neoproterozoic rocks are grouped into four complexes, namely Feiran–Solaf, Sa'al–Zaghra, Kid and Taba. The ENS ophiolites were formed between 730–750 Ma, mainly in a supra‐subduction zone setting. The ENS has undergone a Neoproterozoic deformation history involving three successive phases: (1) Early N–S shortening phase (D1), (2) Syn‐accretionary phase (D2) and (3) Post‐accretionary phase (D3). The initial island‐arc stage (780–730 Ma) is a N–S shortening phase initiated by collision between the Eastern Desert tectonic terrane to the north with both the Gebeit and Gabgaba terranes to the south (830–720 Ma). During the arc‐splitting and back‐arc spreading stage (730–620), voluminous syn‐tectonic granitoids intruded into the ENS (750–610 Ma). The E–W‐directed compressional/transpressional phase (620–450 Ma) led to the overall uplift of the central part of the ENS and consequently the development and exhumation of the core complexes in oblique convergent zones. The E–W intense shortening deformation resulted also in the formation of NW‐ and NE‐striking sinistral and dextral strike‐slip shear zones, respectively. The latest periods of the E–W‐directed compressional/transpressional regime were characterized by deposition of the molasse‐type Hammamat Sediments unconformably over the Dokhan Volcanics, or interbedded with them. The combined thrusting, folding and sinistral‐reverse shearing structures have been interpreted to resulted from the E–W‐directed compressional/transpressional phase in response to the oblique shortening of the Arabian‐Nubian Shield between East and West Gondwana.

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Precambrian Basement Complex of Egypt

Cited by 63 publications

References 220 publications

An Overview on the Classification and Tectonic Setting of Neoproterozoic Granites of the Nubian Shield, Eastern Desert, Egypt

An Overview on the Classification and Tectonic Setting of Neoproterozoic Granites of the Nubian Shield, Eastern Desert, Egypt

Groundwater potential mapping using GIS, linear weighted combination techniques and geochemical processes identification, west of the Qena area, Upper Egypt

Neoproterozoic Tectonic Events of Egypt

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