The evolution of the Neoproterozoic Elat Metamorphic Complex, northernmost Arabian-Nubian Shield: Island arc to syncollisional stage and post-collisional magmatism

Eyal, Yehuda; Eyal, M.; Litvinovsky, B.A.; Jahn, Bor‐ming; Calvo, Ran; Golan, Tzahi

doi:10.1016/j.precamres.2018.10.003

Cited by 20 publications

(6 citation statements)

References 42 publications

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“…650-620 Ma), and post-collision (ca. 620-590 Ma) stages (Bentor, 1985;Stern, 1994b;Stern and Abdelsalam, 1998;Johnson et al, 2011;Eyal et al, 2019). In the southern Sinai, calc-alkaline granitoids were emplaced throughout these three stages of the ANS evolution (Eyal et al, 2010;Be'eri-Shlevin et al, 2012;El -Bialy and Shata, 2018).…”

Section: Tectonic Settingmentioning

confidence: 98%

Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre‐ and Post‐collision Granitoids from the Northern Arabian‐Nubian Shield: A Case Study from Wadi El‐Akhder Granitoids, Southern Sinai, Egypt

Mogahed

Abdelfadil

2021

Acta Geologica Sinica (Eng)

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Section: Tectonic Settingmentioning

confidence: 98%

Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre‐ and Post‐collision Granitoids from the Northern Arabian‐Nubian Shield: A Case Study from Wadi El‐Akhder Granitoids, Southern Sinai, Egypt

Mogahed

Abdelfadil

2021

Acta Geologica Sinica (Eng)

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“…The occurrence of several older (c. 810-700 Ma) ophiolitic sutures (e.g. Berhe, 1990;Ali et al 2010) across the ANS, including the Fawakhir ophiolite that hosts the FIC, is consistent with shield development on an oceanic crust by the juxtaposition of a series of island arcs (Abdel-Rahman, 1995Blasband et al 2000;Loizenbauer et al 2001;Jarrar et al 2003;Johnson & Woldehaimanot, 2003;El-Sayed et al 2004;Abdel-Rahman et al 2009;Johnson et al 2011;El-Bialy, 2013;Robinson et al 2014Robinson et al , 2015Elisha et al 2017Elisha et al , 2019Cox et al 2019;Eyal et al 2019).…”

Section: A Regional Geology and Nature Of Host Rocksmentioning

confidence: 85%

“…While some authors claim that oceanic-arc tectonomagmatic regimes continued to be active until c. 650-620 Ma, after which time post-collisional magmatism began, others suggested that subduction orogenic activities and associated arc-magmatism extended beyond 620 Ma. Studies supporting the view that cessation of the oceanic-arc regime occurred at c. 620 Ma include those of Eyal et al (2010Eyal et al ( , 2014Eyal et al ( , 2019, Be'eri-Shlevin et al 2011, Fritz et al (2013), Jarrar et al 2013and Elisha et al (2017Elisha et al ( , 2019. In contrast, a number of other investigations indicated that active subduction extended beyond 620 Ma (Bentor, 1985;Vail, 1990;Küster & Harms, 1998;Teklay et al 2002a;Doebrich et al 2007;Bea et al 2009;Andresen et al 2010;Johnson et al 2011;Abu El-Enen & Whitehouse, 2013;Fritz et al 2014;Robinson et al 2014).…”

Section: Discussionmentioning

confidence: 96%

“…Numerous investigations of other magmatic complexes within the northern part of the ANS have been carried out (e.g. Bentor, 1985;Abdel-Rahman & Doig, 1987;Abdel-Rahman & Martin, 1987;Abdel-Rahman, 1990, 1995, 2010, 2016, 2019El-Shazly & El-Sayed, 2000;Loizenbauer et al 2001;El-Sayed et al 2004;Eliwa et al 2006;Abdel-Rahman et al 2009;Bea et al 2009;Be'eri-Shlevin et al 2009, 2011Johnson et al 2011;Maurice et al 2012;Fritz et al 2013;Jarrar et al 2013;Eyal et al 2014Eyal et al , 2019Robinson et al 2014;Elisha et al 2017Elisha et al , 2019.…”

Section: Introductionmentioning

confidence: 99%

“…Inset is a location map. Eyal et al 2019), others suggested that such magmatism is subduction-related and developed during the very late orogenic stages of the EAO (e.g. Bentor, 1985;Doebrich et al 2007;Johnson et al 2011;Abu El-Enen & Whitehouse, 2013;Robinson et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis of a rare Ediacaran tonalite–trondhjemite–granodiorite suite, Egypt, and implications for Neoproterozoic Gondwana assembly

Abdel‐Rahman

2020

Geol. Mag.

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Most tonalite–trondhjemite–granodiorite (TTG) suites are Archean–Palaeoproterozoic in age, but those of Neoproterozoic–Phanerozoic age are scarce. A rare Ediacaran high-Al TTG suite has been identified at the Fannani Igneous Complex (FIC) in the northern Arabian–Nubian Shield, which is essentially composed of amalgamated Neoproterozoic island-arc Pan-African composite terranes that contain several ophiolitic sutures. The FIC exhibits a wide range of SiO2, Al2O3, Sr and Zr, shows moderate rare earth element (REE) enrichment, and K, Ti, Nb, Y and heavy REE depletion. It is a subsolvus suite with clear orogenic affinities and strong arc-geochemical signatures. The precise U–Pb zircon thermal ionization mass spectrometry age obtained (607.4 ± 1.95 Ma) indicates oceanic subduction extended to late stages of the East African Orogeny. The FIC exhibits 87Sr/86Sr compositions of 0.70346–0.71091 (Sr(i) ratio, 0.70284), and 143Nd/144Nd of 0.51254–0.51270 (ϵNd(t) = +5.12 to +7.16), typical of modern oceanic-arc rocks (as Japan-arc basalts), and suggestive of mantle sources and island-arc settings. The FIC possesses low values of Yb (1.55 ppm), Nb (14 ppm) and Y (24 ppm), and high ratios of Sr/Y (27), Zr/Sm (46) and Nb/Ta (11.8), typical of magmas produced by anatexis of a basaltic slab. Partial melting models show that the FIC magma was generated by melting (F = 0.25–0.50) of a subducted oceanic crust transformed into eclogite, leaving 10–25% garnet in the residue. The FIC and similar complexes produced via slab melting during the closure of the Mozambique Ocean formed large juvenile belts along the East African Orogen that sutured East and West Gondwana together into a united supercontinent.

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Mineralogy of a rare Ediacaran epidote‐bearing trondhjemitic complex from the Nubian Shield: Insights into P‐T conditions of magma emplacement

Abdel‐Rahman

Shwairi

2022

Geological Journal

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Igneous epidote occurring in tonalite–trondhjemite–granodiorite (TTG) rocks provides valuable insight into the physiochemical parameters of their magmatic system. Epidote has been identified within a newly discovered, rare, Ediacaran, high‐Al TTG‐suite at the Fannani Igneous Complex (FIC), Nubian Shield. The objective is to assess P–T conditions of magma emplacement using petrographic‐, mineral chemical data, and thermobarometry methods. The TTG‐suite is made up of ubiquitous oligoclase, variable contents of quartz, K‐feldspar, amphibole, biotite, epidote, accessory titanite, zircon, apatite and magnetite. Feldspars vary from An14 to An26 in plagioclase, with K‐feldspar having near‐end‐member compositions (Or91–Or95). Amphiboles are Al‐rich (AlT = 1.65–2.04 atoms per formula unit [apfu]), calcic (Ca = 1.83–1.93, apfu), with average Mg/(Fe + Mg) of 0.44, and are ferroedenite–edenite–ferropargasite. Biotites are moderately Fe‐rich (Fe/(Fe + Mg) = 0.50–0.58) characteristic of type ‘C’–biotite of calc–alkaline orogenic rocks. Epidote exhibits pistacite components [Ps = Fe3+/(Fe3++Al)] of Ps24–Ps33, typical of magmatic epidote. The average crystallization pressure of 5.41 kbar (calculated using the Al‐in‐Hb barometer) is consistent with the presence of magmatic epidote and reflects the mesozonal crustal levels of emplacement. The Hb–Plag–geothermometer produced an average crystallization temperature of 721°C. These values fall within experimentally‐determined P–T ranges of stability of magmatic epidote with fO2 buffered from nickel‐nickel‐oxide (NNO) to hematite (HM). The FIC rocks were developed from a wet, subsolvus, orogenic, Al‐rich magmatic system. Findings reported here could have implications for conditions of magma emplacement and mineralogical characterization of TTGs occurring within various continental masses.

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The evolution of the Neoproterozoic Elat Metamorphic Complex, northernmost Arabian-Nubian Shield: Island arc to syncollisional stage and post-collisional magmatism

Cited by 20 publications

References 42 publications

Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre‐ and Post‐collision Granitoids from the Northern Arabian‐Nubian Shield: A Case Study from Wadi El‐Akhder Granitoids, Southern Sinai, Egypt

Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre‐ and Post‐collision Granitoids from the Northern Arabian‐Nubian Shield: A Case Study from Wadi El‐Akhder Granitoids, Southern Sinai, Egypt

Petrogenesis of a rare Ediacaran tonalite–trondhjemite–granodiorite suite, Egypt, and implications for Neoproterozoic Gondwana assembly

Mineralogy of a rare Ediacaran epidote‐bearing trondhjemitic complex from the Nubian Shield: Insights into P‐T conditions of magma emplacement

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