Neoproterozoic tectonic evolution and exhumation history of transpressional shear zones in the East African orogen: implications from kinematic analysis of Meatiq area, Central Eastern Desert of Egypt

Mohammad, Abdullah T.; Kazzaz, Yahia Abbas El; Hassan, Safaa M.; Taha, Maysa M.N.

doi:10.1007/s00531-019-01801-y

Cited by 18 publications

(10 citation statements)

References 86 publications

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“…We concentrate on the major tectonic features and locate them onto a plate tectonic frame. For details, the readers are referred to the summary papers by Fritz et al (1996), Abdeen and Greiling (2005), Abd El-Wahed (2007), Hamimi et al (2019), Mohammad et al (2019), Fowler and Hamimi (2020) and Hamimi and Abd El-Wahed (2020). The relative time constraints of the tectonic regimes are derived from the relationship between the rock formation and deformation.…”

Section: The Structural Provinces Of the Ensmentioning

confidence: 99%

The Tectonic Map and Structural Provinces of the Late Neoproterozoic Egyptian Nubian Shield: Implications for Crustal Growth of the Arabian–Nubian Shield (East African Orogen)

et al. 2022

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The Late Neoproterozoic Egyptian Nubian Shield (ENS) has attracted increasing attention since the establishment of the Egyptian Geological Survey and Mining Authority (EGSMA (1896)), which conducted the first mapping. In the last three decades, rapid improvements in analytical techniques, along with field-oriented studies, have made it possible for the interpretation of the ENS as an integral part of the juvenile Arabian–Nubian Shield (ANS) as a portion of the East African Orogen (EAO). However, a consistent tectonic map of the ENS does not exist. Presentation of such a map is the main objective of the present work where Landsat-based lithological discrimination is combined with the systematic structural investigation and careful reassessment of previously published geological maps. Our interpretation of this map indicates that in accordance with previous work, the basement units of the Eastern Desert (ED) can be divided into three structural domains: Northern, Central, and South-Eastern Desert provinces. The proposed provinces are ascribed to three different plate tectonic far-field boundary conditions. The earliest magmatic, metamorphic, and tectonic history was set off by the approximate north–south convergence of the Gabgaba-Gebeit, Jiddah-Asir terranes, and Eastern Desert-Midyan terranes along the Yanbo-Onib-Sol-Hamid-Gerf-Allaqi-Heiani (YOSHGAH) suture between c. 800 and 620 Ma. The second event between c. 640 and 580 Ma was correlated with the Nabitah Orogeny when the Ad Dawadimi-Ar Rayn terranes in the eastern Arabian Shield accreted to the earlier consolidated arc terranes (Afif and Tathlith terranes). During this period, east–west convergence between northwestern Saudi Arabia and the Central Eastern Desert (CED) in Egypt caused a pronounced strike-slip deformation associated with the displacement along the wider Najd Fault system. The third orogenic phase, which was younger than c. 580 Ma, was controlled by the evolution and retreat of the Cadomian Arc. The northern portions of the ENS and the northern Arabian Shield experienced extension whereas extensive post-orogenic magmatism was related to mantle delamination and associated crustal thinning.

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Section: The Structural Provinces Of the Ensmentioning

confidence: 99%

The Tectonic Map and Structural Provinces of the Late Neoproterozoic Egyptian Nubian Shield: Implications for Crustal Growth of the Arabian–Nubian Shield (East African Orogen)

et al. 2022

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“…This phase was followed a period of transpression associated with a bulk E-W to ENE-WSW shortening, and manifested by NW-SE-trending folds, thrust faults with SW-directed transport, and NW-SE sinistral strike-slip faults (Fowler and Osman, 2001;Abdeen and Greiling, 2005;Andresen et al, 2010;Mohammad et al, 2020). After the ceasing of the orogenic pulses, the northern part of the Nubian shield was subjected to wide-spread regional N-S to NW-SE extension between about 600 Ma and 565 Ma, expressed in the NE-striking normal faults and dyke swarms (Stern 1985;Johnson et al, 2011).…”

Section: Structural Setting and Historymentioning

confidence: 99%

“…1c). The western side of the Meatiq dome is truncated by the NW-SE trending, pervasive Atalla Shear Zone (ASZ), which comprises a major transpressional shear zone with a sinistral sense of shear (Mohammad et al 2020). Fitz et al, (1996, 2002 demarcated the eastern and western borders of Meatiq dome by two NW-trending, strike-slip faults with sinistral sense.…”

Section: Geology Of Meatiq Areamentioning

confidence: 99%

“…): (1) Um Baanib antiform in the eastern side, and (2) Um Esh El-Hamra antiform in the western side. The two folds are separated by a major synformal structure known as Abu Ziran synform (Mohammad et al, 2020). Restoring the pre-doming geometry of the Meatiq shear zone reveals an original sub-horizontal ductile thrust zone (MSZ) with a top-to-NW sense of shearing (Mohammad et al, 2020).…”

Section: Geology Of Meatiq Areamentioning

confidence: 99%

“…The Abu Ziran granite pluton, located in the Central Eastern Desert (CED) of Egypt, is a striking example of syn-tectonic plutons emplaced in compressional regime. The pluton intruded a sub-horizontal ductile shear zone commonly known as Eastern Desert Shear Zone (EDSZ; Andresen et al, 2010;Johnsen et al, 2011), Eastern Desert Décollement (EDD; Stern 2018), or Meatiq shear zone (MSZ; Mohammad et al, 2020) during late Neoproterozoic. The well-exposed floor and roof contacts and clearly documented relationships among the pluton and fabrics in country rocks, making it suitable for understanding the geometrical aspects of intrusions placed along active shear zones.…”

Section: Introductionmentioning

confidence: 99%

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Geometry and growth of syn-tectonic plutons emplaced in thrust shear zones: Insights from Abu Ziran Pluton, Egypt

Mohammad¹,

Kazzaz²

2022

Preprint

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Coupling of deformation and magmatism has been reported in several old orogenic belts, particularly along thrust faults and shear zones. The syn-kinematic plutons in exhumed shear zones offer the best opportunity to understand the complex relationship between magmatism and regional deformation. The present paper investigates the geometry and internal structure of granite plutons emplaced in thrust faults and shear zones, and structural control on their emplacement mechanism. Abu Ziran pluton is an example of the intrusions emplaced in active brittle-ductile zones in the Nubian shield, and documents clear evidence on the interaction between magmatism and regional deformation during melt ascent and emplacement. Results from detailed geological mapping, remote sensing, and structural analysis of the pluton and associated highly strained rocks permitted the constraining of the pluton's geometry, emplacement mechanism, and spatio-temporal evolution. Structural analysis of the study area indicates that pluton emplacement was syn- to-late-tectonic. The brittle-ductile fabrics in the wall rock are consistent with a sub-horizontal thrust shear zone with a top-to-NW shear sense. The activity of the shear zone was accompanied by an episode of a calc-alkaline magmatic pulse. Granitic magma ascended upward via non-exposed feeder dykes, or through ramps and flats in the thrust system and emplaced laterally along the shear zone, forming complex sub-horizontal sheet-shaped intrusion. The geometry and extent of pluton emphasize that inherited heterogeneities and regional stress states played important role in the emplacement processes. In addition, localization of pluton along or near the contact between ophiolitic nappes and mylonitic metasediments suggests that the rheological boundaries act as barriers that impedes the rise of ascending magma, causing magma arrest, and triggers lateral spreading and emplacement. The outcomes of this study allowed the reconstruction of the geometry and internal structure of Abu Ziran pluton and an understanding of its evolution in space and time.

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The Egyptian Nubian Shield Within the Frame of the Arabian–Nubian Shield

El‐Wahed

Hamimi

2020

Regional Geology Reviews

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Neoproterozoic tectonic evolution and exhumation history of transpressional shear zones in the East African orogen: implications from kinematic analysis of Meatiq area, Central Eastern Desert of Egypt

Cited by 18 publications

References 86 publications

The Tectonic Map and Structural Provinces of the Late Neoproterozoic Egyptian Nubian Shield: Implications for Crustal Growth of the Arabian–Nubian Shield (East African Orogen)

The Tectonic Map and Structural Provinces of the Late Neoproterozoic Egyptian Nubian Shield: Implications for Crustal Growth of the Arabian–Nubian Shield (East African Orogen)

Geometry and growth of syn-tectonic plutons emplaced in thrust shear zones: Insights from Abu Ziran Pluton, Egypt

The Egyptian Nubian Shield Within the Frame of the Arabian–Nubian Shield

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