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001-es BibID:BIBFORM091968
Első szerző:Abd El-Wahed, Mohamed
Cím:Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt : Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination / Mohamed Abd El-Wahed, Samir Kamh, Mahmoud Ashmawy, Aly Shebl
Dátum:2019
ISSN:1000-9515
Megjegyzések:Transpressional deformation has played an important role in the late Neoproterozoic evolution of the Arabian-Nubian Shield including the Central Eastern Desert of Egypt. The Ghadir Shear Belt is a 35 km-long, NW-oriented brittle-ductile shear zone that underwent overall sinistral transpression during the Late Neoproterozoic. Within this shear belt, strain is highly partitioned into shortening, oblique, extensional and strike-slip structures at multiple scales. Moreover, strain partitioning is heterogeneous along-strike giving rise to three distinct structural domains. In the East Ghadir and Ambaut shear belts, the strain is pure-shear dominated whereas the narrow sectors parallel to the shear walls in the West Ghadir Shear Zone are simple-shear dominated. These domains are comparable to splay-dominated and thrust-dominated strike-slip shear zones. The kinematic transition along the Ghadir shear belt is consistent with separate strike-slip and thrust-sense shear zones. The earlier fabric (S1), is locally recognized in low strain areas and SW-ward thrusts. S2 is associated with a shallowly plunging stretching lineation (L2), and defines ~NW-SE major upright macroscopic folds in the East Ghadir shear belt. F2 folds are superimposed by ~NNW-SSE tight-minor and major F3 folds that are kinematically compatible with sinistral transpressional deformation along the West Ghadir Shear Zone and may represent strain partitioning during deformation. F2 and F3 folds are superimposed by ENE-WSW gentle F4 folds in the Ambaut shear belt. The sub-parallelism of F3 and F4 fold axes with the shear zones may have resulted from strain partitioning associated with simple shear deformation along narrow mylonite zones and pure shear-dominant deformation in fold zones. Dextral ENE-striking shear zones were subsequently active at ca. 595 Ma, coeval with sinistral shearing along NW- to NNW-striking shear zones. The occurrence of upright folds and folds with vertical axes suggests that transpression plays a significant role in the tectonic evolution of the Ghadir shear belt. Oblique convergence may have been provoked by the buckling of the Hafafit gneiss-cored domes and relative rotations between its segments. Upright folds, fold with vertical axes and sinistral strike-slip shear zones developed in response to strain partitioning. The West Ghadir Shear Zone contains thrusts and strike-slip shear zones that resulted from lateral escape tectonics associated with lateral imbrication and transpression in response to oblique squeezing of the Arabian-Nubian Shield during agglutination of East and West Gondwana.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Acta Geologica Sinica-English Edition. - 93 : 6 (2019), p. 1614-1646. -
További szerzők:Kamh, Samir Ashmawy, Mahmoud Shebl, Aly (1992-) (geológus)
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2.

001-es BibID:BIBFORM113571
035-os BibID:(Scopus)85158994087 (WoS)000980227400020
Első szerző:Badawi, Mohamed
Cím:Mapping Structurally Controlled Alterations Sparked by Hydrothermal Activity in the Fatira-Abu Zawal Area, Eastern Desert, Egypt / Mohamed Badawi, Mahmoud Abdelatif, Ali Shebl, Farid Makroum, Ahmed Shalaby, Norbert Németh
Dátum:2023
ISSN:1000-9515
Megjegyzések:The Eastern Desert of Egypt suffered a protracted period of deformation triggered by cratonization of the new juvenile crust known as the Arabian Nubian Shield (ANS), which has been proposed for potential gold discoveries associated with the corresponding tectonic event. The Fatira area, on the border of Egypt's Northern and Central Eastern Deserts, is covered with metavolcanic rocks twisted by a dextral relocation of the Fatira Shear Zone (FSZ) relative to the Barud magmatic body. The recent study evaluated many deformed post-orogenic granitic intrusions and felsite dikes associated with promising mineralization localities, notably orogenic gold deposits. The combination of various field observations and remote sensing data, followed by the analysis of aeromagnetic enhanced maps, allowed the differentiation of distinct lithologies, structural features, and hydrothermal alterations in the study area. Additionally, the integrated results obtained from the different interpretation techniques are utilized to identify and confirm the previously supposed mineralized localities in the Fatira and Abu Zawal areas and predict other matched localities. The final ASTER, Sentinel 2 hydrothermal alteration, and orientation entropy heat maps demonstrate the association between these mineralized regions and major structures related to the FSZ late stage of deformation rather than other structures studied throughout the area of interest.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
gold
granite
island arc association
Pan-African Orogeny
Egypt
Megjelenés:Acta Geologica Sinica-English Edition. - 97 : 2 (2023), p. 662-680. -
További szerzők:Abdelatif, Mahmoud Shebl, Aly (1992-) (geológus) Makroum, Farid Shalaby, Tarek Németh Norbert
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DOI
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