Structural constraints on the evolution of the Meatiq Gneiss Dome (Egypt), East-African Orogen

Andresen, Arild; Augland, Lars Eivind; Boghdady, Gamal Y.; Lundmark, Anders Mattias; El-Nady, Osman M.; Hassan, M. A.; El-Rus, Mohamed A. Abu

doi:10.1016/j.jafrearsci.2009.11.007

Cited by 71 publications

(46 citation statements)

References 32 publications

(67 reference statements)

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“…Andresen et al 2009;Bregar et al 2002;Kröner et al 1994;Liégeois and Stern 2010;Lundmark et al 2009;Stern 1994). The data further support the tectonostratigraphic interpretation by Fowler et al (2007) that the gneisses of the El-Sibai area are not part of a gneiss dome separated from an overlying low-grade sequence by a shear zone, but rather represent syn-kinematic granitoids intruded during a stage of assembly of the island arc affined allochthon (Andresen et al 2010) in the Eastern Desert. Finally, we document the presence of Early Cambrian juvenile intrusives and suggest that these represent an anorogenic magmatic phase post-dating and unrelated to the East African orogeny.…”

Section: Discussionsupporting

confidence: 73%

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U–Pb ID-TIMS dating of igneous and metaigneous rocks from the El-Sibai area: time constraints on the tectonic evolution of the Central Eastern Desert, Egypt

Augland

Andresen

Boghdady

2011

Int J Earth Sci (Geol Rundsch)

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This paper presents new ID-TIMS U-Pb zircon and titanite ages from the El-Sibai gneiss complex in the Eastern Desert of Egypt. The zircon data support previous studies, indicating that the protoliths of the gneissic (oldest) units in the area were emplaced during the East African orogeny, and do not represent an older pre-Neoproterozoic, reworked cratonic basement. The crystallization ages of three compositionally distinct orthogneiss protoliths are c. 685, 682 and 679 Ma, respectively. A U-Pb titanite age from one orthogneiss overlaps with the protolith age, indicating that the gneisses did not undergo post-magmatic high-temperature metamorphism. The gneissic textures of the rocks are therefore interpreted to reflect syn-emplacement deformation. This, and evidence for static amphibolite facies metamorphism in country-rock metavolcanics, lead us to conclude that the gneisses of El-Sibai do not represent an exhumed middle crustal gneiss dome, but are part of the island arc affined allochthon into which they were emplaced synchronously with NW-ward nappe translation. We also report ages from rocks cross-cutting the gneisses and the surrounding island arc affined assemblages that yield the hitherto youngest robust preCretaceous intrusive ages in the Eastern Desert. The dated rocks are an anorthosite and a cross-cutting syenogranite giving ages of c. 541 and 540 Ma, respectively. We consider this late magmatic pulse to be anorogenic, most likely reflecting a separate extensional event involving asthenospheric upwelling and decompression melting of the mantle.

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Section: Discussionsupporting

confidence: 73%

“…Neumayr et al 1996) between the gneisses and the island arc affined allochthon ). Andresen et al (2010) named the shear zone the Eastern Desert Shear Zone (EDSZ). Other gneiss complexes, e.g.…”

Section: Geological Settingmentioning

confidence: 99%

U–Pb ID-TIMS dating of igneous and metaigneous rocks from the El-Sibai area: time constraints on the tectonic evolution of the Central Eastern Desert, Egypt

Augland

Andresen

Boghdady

2011

Int J Earth Sci (Geol Rundsch)

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“…2). The infra-and suprastructures are separated by the Eastern Desert Shear Zone (EDSZ; Andresen et al, 2010). Further to the west, these Neoproterozoic rocks are bordered by the pre-Neoproterozoic Sahara metacratonic crust, however this transition is poorly understood (e.g., Abdelsalam et al, 2002, Figs.…”

Section: Eastern Desert Of Egyptmentioning

confidence: 99%

Provenance of the heavy mineral-enriched alluvial deposits at the west coast of the Red Sea. Implications for evolution of Arabian–Nubian crust

Mahar¹,

Ibrahim²,

Goodell³

2014

Journal of African Earth Sciences

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“…6). These listric faults have probably exhumed and exposed low-grade greenschist core of the Al-Yutamah Dome during the EAO in a similar manner as the gneisses core of the Nubian Shield [24].…”

Section: Listric Faults Developmentmentioning

confidence: 99%

Complex Tectonic History of Al-Yutamah Dome Area within Hijaz Terrane, Arabian Shield, South of Al Madinah, Saudi Arabia

Bamousa¹

2013

TOGEOJ

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This paper documents the Al-Yutamah tectonic dome, located in the northwestern part of the Arabian Shield, Saudi Arabia. A new Infracambrian over-thrust fault zone is mapped, which superpose the Late Proterozoic rocks in the area. Kinematic indicators suggest top-to-the-south movements along this fault, mainly compressional and some extensional in nature. The area experienced several tectonic events that resulted in to a complex dome like structure formation with a surface area of 20 50 km 2 . The S 1 cleavages, which have been determined as the oldest structural features in the area, are attributed to (D 1 ) tectonic event along the Labunah Thrust Fault. This event was followed by another deformational event (D 2 ) that produced N-S trending F 2 folds in the area. The third deformational event (D 3 ) observed in the area is the brittle high-angle reverse faults, which generally dip toward north and south, suggesting compressional nature of the event. Fourth deformational event (D 4 ) in the area resulted in the formation of E-W trending F 4 folding, which occurred subsequent to the development of Najd Strike-slip Faulting and F 2 folding. Superposition of the F 2 and F 4 folds in the area developed a complex structural feature in the shape of Al-Yutamah dome. Overthrusting of the meta-sedimentary rocks as a result of movement along the Al-Yutamah fault is considered as a fifth tectonic event (D 5 ). The Al-Yutamah over-thrust fault is most likely late Infracambrian in age, which is associated with the Najd Strikeslip Fault zone. The Cenozoic listric faulting that probably exhumed the dome is considered as a sixth deformational event (D 6 ) in the area. During the Cenozoic, cross-cut faults developed in the dome by high-angle normal faulting that dissected it into different segments.

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Structural constraints on the evolution of the Meatiq Gneiss Dome (Egypt), East-African Orogen

Cited by 71 publications

References 32 publications

U–Pb ID-TIMS dating of igneous and metaigneous rocks from the El-Sibai area: time constraints on the tectonic evolution of the Central Eastern Desert, Egypt

U–Pb ID-TIMS dating of igneous and metaigneous rocks from the El-Sibai area: time constraints on the tectonic evolution of the Central Eastern Desert, Egypt

Provenance of the heavy mineral-enriched alluvial deposits at the west coast of the Red Sea. Implications for evolution of Arabian–Nubian crust

Complex Tectonic History of Al-Yutamah Dome Area within Hijaz Terrane, Arabian Shield, South of Al Madinah, Saudi Arabia

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