Neoproterozoic arc sedimentation, metamorphism and collision: evidence from the northern tip of the Arabian-Nubian Shield and implication for the terminal collision between East and West Gondwana

Abu Sharib, Ahmed S.A.A., Maurice, Ayman E., Abd El-Rahman, Yasser M., Sanislav, Ioan V., Schulz, Bernhard, and Bakhit, Bottros R. (2019) Neoproterozoic arc sedimentation, metamorphism and collision: evidence from the northern tip of the Arabian-Nubian Shield and implication for the terminal collision between East and West Gondwana. Gondwana Research, 66. pp. 13-42.

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Abstract

In the Wadi Um Had area, Central Eastern Desert, Egypt, NE-trending metapelitic and molasse-type successions are exposed. The metasediments bear the geochemical signature of a first depositional cycle in two distinct continental island arc settings that derived from incipiently-to moderately-weathered intermediate to felsic sources under generally warm and humid conditions. The metapelitic succession records three distinct episodes of metamorphism, M1–M3, whereas the molasse-type succession records only the last metamorphic episode, M3. M1/D1 records an amphibolite facies tectono-metamorphic event that has been dated at 625 ± 5 Ma, whereas M2/D2 records a greenschist facies subduction-related event. Collision of the two domains during a NE–SW shortening D3, culminated in formation of the macroscopic NW–SE-trending folds. D2 and D3 correlate with the gneiss-forming event, which is constrained at <609 Ma, and doming of the nearby Meatiq gneiss dome, respectively. M3 is a hornblende hornfels facies thermal metamorphism related to the intrusion of the post-orogenic, Neoproterozoic (596.3 Ma) Um Had granite. This study records, for the first time, a tectono-metamorphic phase predating the gneiss-forming event in the Meatiq gneiss dome, and pushes the boundary of the Late Ediacaran terminal collision between East and West Gondwana to ≤600 Ma.

Item ID: 56144
Item Type: Article (Research - C1)
ISSN: 1342-937X
Keywords: collision; Gondwana; Neoproterozoic; Arabian-Nubian Shield; Eastern Desert; Um Had; Egypt
Copyright Information: Copyright © 2018 International Association for Gondwana Research.
Date Deposited: 18 Nov 2018 23:07
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040313 Tectonics @ 60%
04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 10%
04 EARTH SCIENCES > 0403 Geology > 040312 Structural Geology @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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