Petrogenesis of the Pan-African El-Bula Igneous Suite, central Eastern Desert, Egypt

El-Shazly, Somaya; El-Sayed, Mohamed M.

doi:10.1016/s0899-5362(00)00101-9

Cited by 19 publications

(17 citation statements)

References 33 publications

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“…Dardier and Al-Wakeel (1998) reported a tholeiitic affinity for the metavolcanics. El-Shazley and El-Sayed (2000) confirmed the tholeiitic chemistry and concluded that the trace element abundances are consistent with a back-arc environment. Fig.…”

Section: Abu Marawat Metavolcanicsmentioning

confidence: 54%

“…Detailed regional studies have also been completed by El-Gaby and Habib (1980Habib ( , 1982 and Habib (1987a,b). Mainly geochemical studies of the granitoids in the Barud area have been reported by Ghobrial and Girgis (1982), Dardier and Al-Wakeel (1998), El-Shazley and El-Sayed (2000) and Kamal ElDin (2003). Abd El-Wahed and Abdeldayem (2002) reported on the structural history of the Barud area.…”

Section: Location and Previous Investigationsmentioning

confidence: 98%

“…Alternatively, these amphibolites and schists have been labeled as the Abu Furad Gneiss, grouped together with granitoid gneissic rocks, and considered as part of the pre-Pan-African continental crust (Barud infrastructure) by El-Gaby and Habib (1980Habib ( , 1982; Habib (1987a,b); El-Gaby et al (1988);El-Gaby (1994) and El-Shazley and El-Sayed (2000). A part of these amphibolites was identified as Meatiq Group by Masoud et al (1992).…”

Section: Abu Furad Amphibolites and Schistsmentioning

confidence: 99%

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The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt

Fowler

Ali

Omar

et al. 2006

Journal of African Earth Sciences

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Section: Abu Marawat Metavolcanicsmentioning

confidence: 54%

Section: Location and Previous Investigationsmentioning

confidence: 98%

Section: Abu Furad Amphibolites and Schistsmentioning

confidence: 99%

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The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt

Fowler

Ali

Omar

et al. 2006

Journal of African Earth Sciences

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“…It was the subject of many contributions especially its central and southern parts (e.g., Habib 1972Habib , 1987Akaad et al 1973;Abu El-Ela 1979;El-Gaby and Habib 1982;Kamal El-Din and Asran 1994;Masoud 1997;Abd El-Wahed and Abdeldayem 2002;Fowler et al 2006). The Barud batholith exhibit distinct intrusive features to the Fatira sheared metavolcanics and also to metavolcanics and amphibolites around Qena-Safaga road (Abd ElWahed and Abdeldayem 2002;Fowler et al 2006), and not an autochthonous igneous body separated from a remobilized granitized pre-Pan-African basement (Fowler et al 2006), as proposed by Akaad et al (1973), El-Gaby and Habib (1982), Habib (1987), El-Gaby et al (1990), El-Gaby (1994), andEl-Shazley andEl-Sayed (2000). Petrochemical studies of the Barud tonalite-granodiorite considered it as subduction-related volcanic arc melts of probable mantle origin (Hussein et al 1982; Abdel- g biotite schist after banded tuffs still preserve the original banding with S 1 parallel to S 0 , the light band is rich in chlorite retrogressed after biotite; h migmatitic amphibolite from the eastern domain exhibiting weak foliation; and i migmatitic amphibolite showing granoblastic texture Rahman 1995; Moghazi 1999;El-Shazley and El-Sayed 2000;El-Sayed et al 2003).…”

Section: Barud Tonalite-granodioritementioning

confidence: 70%

Synoblique convergent and extensional deformation and metamorphism in the Neoproterozoic rocks along Wadi Fatira shear zone, Northern Eastern Desert, Egypt

El‐Wahed

Anbar

2008

Arab J Geosci

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The Wadi Fatira area occurs at the southern margin of the Northern Eastern Desert (NED) of Egypt and is occupied by highly sheared metavolcanics tectonically alternated with banded iron formations and intruded by Barud tonalite-granodiorite, post-tectonic gabbroic and granitic intrusions. Detailed structural investigation showed that the schists and migmatitic amphibolites are formed by shearing in metavolcanics and syntectonic Barud tonalitegranodiorite due to movement along the Wadi Fatira shear zone (WFSZ). This shear zone starts as a NW-SE striking fault along Wadi Barud Al Azraq and the Eastern part of Wadi Fatira and turns to a E-W trending fault to the north of Wadi Fatira. Microstructural shear sense indicators such as asymmetric geometry of porphyroclasts such as σ-type and asymmetric folds deforming fine-grained bands which are frequently found around porphyroclasts indicate sinistral sense of shearing along the WFSZ. This shear zone is characterized by transitions from local convergence to local extension along their E-W and NW-SE trending parts, respectively. The NW-SE part of the WFSZ is of about 200 m in width and characterized by synmagmatic extensional features such as intrusion of synkinematic tonalite, creation of NE-SE trending normal faults, and formation of migmatitic amphibolites and schlieric tonalites. This part of the shear zone is metamorphosed under synthermal peak metamorphic conditions (725°C at 2-4 kbar). The E-W compressional part of the WFSZ is up to 3 km in width and composed of hornblende, chlorite, actinolite, and biotite schists together with sheared intermediate and acidic metatuffs. Contractional and transpressional structures in this part of the WFSZ include E-W trending major asymmetrical anticline and syncline, nearly vertical foliation and steeply pitching stretching lineations, NNE dipping minor thrusts, and minor intrafolial folds with their hinges parallel to the stretching lineation. P-T estimates using mineral analyses of plagioclase and hornblende from schists and foliated metavolcanics indicate prograde metamorphism under medium-grade amphibolite facies (500-600°C at 3-7 kbar) retrogressed to low-grade greenschist facies (227-317°C). The foliation in Barud tonalite-granodiorite close to the E-W part of the WFSZ runs parallel to the plane of shearing and the tonalite show numerous magmatic flow structures overprinted by folding and ductile shearing. The WFSZ is similar to structures resulted from combined simple shear and orthogonal shortening of oblique transpressive shear zones and their sense of movement is comparable with the characteristics of the Najd Fault System.

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“…The Jabal Sabir granite is generally enriched in Nb (123×10 -6 -223×10 -6 ), Y (65×10 -6 -115×10 -6 10 -6 ), Zr (483×10 -6 -755×10 -6 ), and Ga (24×10 -6 -31×10 -6 ), compared to the Pan-African orogenic granites (e.g. Abdel-Rahman and Martin, 1987;Moghazi et al, 1998;El-Shazly and El-Sayed, 2000;Jarrar et al, 2003), implying significant concentrations of accessory minerals (i.e., zircon and apatite), a characteristic feature of the alkaline granites in general (Harris and Marriner, 1980;Whalen et al, 1996;Smith et al, 1999;Schmitt et al, 2000). This feature has been related to the high fluorine contents of alkaline granitic melts, and to solubility relationships of the accessory minerals (i.e., zircon and apatite; Collins et al, 1982;Watson and Harrison, 1983;Keppler, 1993).…”

Section: Geochemistrymentioning

confidence: 99%

Petrogenesis of granitic rocks of the Jabal Sabir area, South Taiz City, Yemen Republic

El-Gharbawy

2011

Chin. J. Geochem.

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The Tertiary granitic intrusive body (~21 Ma) of the Jabal Sabir area was emplaced during the early stages of the Red Sea opening. This intrusive body occupies the southern sector of Taiz City. It is triangular in shape, affected by two major faults, one of which is in parallel to the Gulf of Aden, and the other is in parallel to the eastern margin of the Red Sea coast. The petrogenesis of such a type of intrusion provides additional information on the origin of the Oligo-Miocene magmatic activity in relation to the rifting tectonics and evolution of this part of the Arabian Shield.The granitic body of Jabal Sabir belongs to the alkaline or peralkaline suite of A-type granites. It is enriched in the REE. The tight bundle plot of its REE pattern reflects neither tectonism nor metamorphism. This granite body is characterized by high alkali (8.7%-10.13%), high-field strength elements (HFSE), but low Sr and Ba and high Zn contents. The abundance of xenoliths from the neighboring country rocks and prophyritic texture of the Jabal Sabir granite body indicate shallow depths of intrusion. The major and trace elements data revealed a fractional crystallization origin, probably with small amounts of crustal contamination. It is interpreted that the Jabal Sabir intrusion represents an anorogenic granite pertaining to the A-type, formed in a within-plate environment under an extensional tectonic setting pertaining to rift-related granites.

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Petrogenesis of the Pan-African El-Bula Igneous Suite, central Eastern Desert, Egypt

Cited by 19 publications

References 33 publications

The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt

The significance of gneissic rocks and synmagmatic extensional ductile shear zones of the Barud area for the tectonics of the North Eastern Desert, Egypt

Synoblique convergent and extensional deformation and metamorphism in the Neoproterozoic rocks along Wadi Fatira shear zone, Northern Eastern Desert, Egypt

Petrogenesis of granitic rocks of the Jabal Sabir area, South Taiz City, Yemen Republic

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