Multistage Tectonism and Metamorphism During Gondwana Collision: Baladiyah Complex, Saudi Arabia

Abu-Alam, Tamer; Hassan, M.; Stüwe, Kurt; Meyer, Sven; Passchier, Cees W.

doi:10.1093/petrology/egu046

Cited by 35 publications

(15 citation statements)

References 43 publications

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“…Three different age granitic suites intrude the same area of the Ha'il, northern Afif, and Ad Dawadimi terranes: (1) the 620–600 Ma Idah Suite classified as an A‐type alkaline granite, (2) the 599 Ma Malik Granite classified as an I‐ and S‐type (garnet‐bearing) and A‐type (garnet‐absent) calc‐alkaline granite, and (3) the 584–566 Ma Abanat Suite classified as an A‐type peralkaline granite. All suites post‐date major ~760–640 Ma ANS accretion described by many studies [e.g., Black and Liégeois , ; Johnson et al ., ; Fritz et al ., ; Abu‐Alam et al ., ], but using whole‐rock geochemistry, earlier suites (1 and 2) that follow shortly after cessation of terrane accretion (referred to as late‐orogenic) are distinguished from younger units (suite 3) that occur ~60 Myr after accretion terminated (referred to as post‐orogenic). The geochemical significance of and potential petrogenetic model for the Ha'il magmatism is discussed below and then integrated with regional tectonic implications emphasizing the development of the ~620–525 Ma NFS, which is one of the last tectonic events associated with Gondwana assembly recorded in the ANS.…”

Section: Discussionmentioning

confidence: 99%

“…Notably, Whitehouse et al [] and more recently Hassan et al [] and Stern et al [] also document and discuss the influence of pre‐Neoproterozoic crust in Yemen, Sinai, and NE Jordan, respectively. According to Johnson et al [], both western and eastern terranes have been deformed by at least four periods of arc collision and suturing, are overlain by post‐amalgamation (<640 Ma) basins [e.g., Nettle et al ., ], and intruded by granitoids [e.g., Robinson et al ., ], all followed by multiple exhumation and erosion events [ Abu‐Alam et al ., ]. The Proterozoic tectonomagmatic history of these deformation periods is described in Bentor [], Black and Liégeois [], and Stein and Goldstein [].…”

Section: Geological Settingmentioning

confidence: 99%

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A discussion on the tectonic implications of Ediacaran late- to post-orogenic A-type granite in the northeastern Arabian Shield, Saudi Arabia

et al. 2017

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The transition from late‐orogenic to post‐orogenic magmatism following major orogenic episodes such as the Neoproterozoic to Cambrian East African Orogen (EAO) is an important, yet not well‐understood geological event marking the cessation of subduction‐controlled magmatism between buoyant lithospheric fragments. Forming the northern part of the EAO in the Arabian‐Nubian Shield are three granitic suites that successively intruded the same northeastern area and post‐date the ~640 Ma major orogenic episode: (1) 620–600 Ma alkali feldspar (hypersolvous) granite with alkaline/ferroan/A‐type geochemistry, (2) 599 Ma granite cumulates (some garnet‐bearing) with calc‐alkaline/magnesian affinities, and (3) 584–566 Ma alkali feldspar (hypersolvous) granite (aegirine‐bearing) with a distinctive peralkaline/ferroan/A‐type signature. Combining whole‐rock geochemistry from the southern and northern Arabian Shield, suites 1 and 2 are suggested to be products of late‐orogenic slab tear/rollback inducing asthenospheric mantle injection and lower crustal melting/fractionation toward A‐type/ferroan geochemistry. Suite 3, however, is suggested to be produced by post‐orogenic lithospheric delamination, which replaced the older mantle with new asthenospheric (rare earth element‐enriched) mantle that ultimately becomes the thermal boundary layer of the new lithosphere. Major shear zones, such as the 620–540 Ma Najd Fault System (NFS), are some of the last tectonic events recorded across the Arabian Shield. Data presented here suggest that the NFS is directly related to the late‐orogenic (620–600 Ma) slab tear/rollback in the northeastern Shield as it met with opposing subduction polarity in the southern Shield. Furthermore, this study infers that east and west Gondwana amalgamation interacted with opposing convergence reflected by the NFS.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

A discussion on the tectonic implications of Ediacaran late- to post-orogenic A-type granite in the northeastern Arabian Shield, Saudi Arabia

et al. 2017

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“…Quantitative compositional mapping allows measuring the natural variability of the mineral phases at the scale of a thin section and thus is useful in petrogenetic analysis (e.g., Kohn and Spear 2000). Compositional mapping has been successfully combined with multi-equilibrium thermobarometry Yamato et al 2007;Fiannacca et al 2012;Lanari et al 2012Lanari et al , 2013Lanari et al , 2014aPourteau et al 2013;Grosch et al 2014;Loury et al 2015Loury et al , 2016Trincal et al 2015;Scheffer et al 2016) and forward thermodynamic modeling (Abu-Alam et al 2014;Lanari et al 2017) or may be used to extract mineral modes (Cossio et al 2002;Martin et al 2013) and local compositions (Centrella et al 2015;Riel and Lanari 2015;Mészaros et al 2016).…”

Section: Quantitative X-ray Mappingmentioning

confidence: 99%

Local Bulk Composition Effects on Metamorphic Mineral Assemblages

Lanari

Engi

2017

Reviews in Mineralogy and Geochemistry

157

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“…The origin and tectonic evolution of these metamorphic domes in the Arabian-Nubian shield have been debated for some time (El Gaby et al, 1984;Fritz et al, 1996;Genna et al, 2002;Johnson and Woldehaimanot, 2003) and remain a subject of interest (Meyer et al, 2014;Abu-Alam et al, 2014). Geochronological age data for the gneissic domes cluster around 750 and 600 Ma, and zircon crystals typically show no older cores (Kröner et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

“…Based on recent studies of the Feiran-Solaf complex in Sinai, the Baladiyah complex in Saudi Arabia, and a literature review of all gneissic domes of the shield, Abu-Alam and Stüwe (2009) and Abu-Alam et al (2014) concluded that there is probably no unifying exhumation mechanism for the entire group of metamorphic domes in the Arabian-Nubian shield. However, there is a general consensus that most of the domes were exhumed in connection with the activity of the Najd fault system at the end of the Pan-African orogeny.…”

Section: Introductionmentioning

confidence: 99%

Structural interpretation of the Wadi Hafafit culmination: A Pan-African gneissic dome in the central Eastern Desert, Egypt

Makroum

2017

Lithosphere

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The emplacement and exhumation of gneissic domes of continental lithospheric fragments within the Pan-African oceanic crust in the Arabian-Nubian shield have been subjects of debate in the recent literature. The Wadi Hafafit culmination is one of the largest metamorphic dome complexes, not only in the Eastern Desert, but also in the Arabian-Nubian shield. The culmination forms a northwest-trending folded belt including five individual gneissic domes that show complex interference fold patterns, bounded by northwest-to west-northwest-trending marginal shear zones (the Nugrus and Hafafit shear zones), which belong to the late Proterozoic Najd fault system in the Eastern Desert of Egypt. The Hafafit metamorphic dome forms a positive flower structure that is characterized by a vertical stretch in the central part with subvertical foliation at the individual dome peripheries, subhorizontal flattening in the roof, and near simple shear at the complex margins defined by the Nugrus and Hafafit shear zones. This study presents arguments concerning the folding pattern and exhumation of the culmination and its relation to sinistral, transpressional kinematics along the branches of the Najd fault system. The folded axial surfaces of the gneissic domes are interpreted in terms of interference of two fold generations: (1) an early fold generation that developed east-northeasttrending axial surfaces, which may have formed during late Pan-African northwestward nappe stacking, and (2) a late fold generation that developed north-south-trending fold axes that deformed the axial surfaces of the first fold generation, and probably associated with sinistral shearing on the Nugrus and Hafafit shear zones. The fold interference patterns associated with exhumation of the Hafafit gneissic domes are consistent with published geochronological data and the tectonic evolution of the Arabian-Nubian shield.

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Multistage Tectonism and Metamorphism During Gondwana Collision: Baladiyah Complex, Saudi Arabia

Cited by 35 publications

References 43 publications

A discussion on the tectonic implications of Ediacaran late- to post-orogenic A-type granite in the northeastern Arabian Shield, Saudi Arabia

A discussion on the tectonic implications of Ediacaran late- to post-orogenic A-type granite in the northeastern Arabian Shield, Saudi Arabia

Local Bulk Composition Effects on Metamorphic Mineral Assemblages

Structural interpretation of the Wadi Hafafit culmination: A Pan-African gneissic dome in the central Eastern Desert, Egypt

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