Inverted Barrovian Metamorphic Zones in the Poly-Deformed Domains of the Western Wadi Allaqi Shear Zone (South Eastern Desert, Egypt): Geochemical and Structural Constraints

Poly-deformed late-Proterozoic metamorphic domains covering Um Ashira area at the western segment of Wadi Allaqi shear zone, South Eastern Desert of Egypt, show evidences of inverted Barrovian metamorphism. They exhibit four metamorphic zonal patterns, arranging progressively from chlorite, biotite,...

Full description

Saved in:
Bibliographic Details
Published in:Geotectonics 2021, Vol.55 (1), p.94-111
Main Authors: Radwan, A., El Fakharani, A., Abbas, H., Younis, M. H., Emam, A., Fawzy, Sh
Format: Article
Language:English
Subjects:
Biotite
Chlorite
Deformation
Deserts
Domains
Earth and Environmental Science
Earth Sciences
Garnet
Metamorphism
Metamorphism (geology)
Minerals
Planar structures
Precambrian
Shear zone
Sillimanite
Structural Geology
Tectonics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Poly-deformed late-Proterozoic metamorphic domains covering Um Ashira area at the western segment of Wadi Allaqi shear zone, South Eastern Desert of Egypt, show evidences of inverted Barrovian metamorphism. They exhibit four metamorphic zonal patterns, arranging progressively from chlorite, biotite, garnet, to sillimanite zones. The higher grade metamorphic domains appear at higher structural levels with general dipping toward the North East. Four deformational phases (D 1 –D 4 ), associating with major planar structures (S 1 –S 4 ), and four mesoscopic and microscopic folds are recognized. The pervasive fabric, growth of metamorphic minerals and peak metamorphism were linked to D 2 deformation phase. Structural, petrographic, microchemical, and thermobarometric data along South-North profile show possibility of inverted Barrovian metamorphic pattern with an increase in the metamorphic grade toward the North. The established structural sequence and tectonic modeling suggest that the apparent inversion coexists due to the main F 2 folding phase.
ISSN:0016-8521
1556-1976
DOI:10.1134/S0016852121010118