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- W2079755082 abstract "The late Pan-African Fawakhir, Um Had and Um Effein Granite Plutons in the Egyptian Central Eastern Desert are small, elongate to circular bodies of pink monzogranite and syenogranite, and grey monzodiorite. Structural investigation of the intrusive contacts of these plutons reveals marginal sub-horizontal intrusive sheets as magma injection along pre-existing flat-lying structures including mineral foliations and thrust faults. Space for emplacement of granitic plutons was accommodated by uplift of the country rocks along steep marginal faults with rotation of the wall rocks whose outer contacts are in the style of laccoliths. Overall, the Um Had Granite Pluton has a phacolithic shape controlled by a south-plunging domed mylonitic shear zone, which separates gneissic rocks (preserved as a pluton core) from low grade overthrust units. The structural features of these plutons are consistent with upper crustal level emplacement at depths where σ3 is vertical. Emplacement is likely to have occurred after northeast-southwest transpression, rather than in an extensional tectonic environment. Les plutons granitiques pan-africains tardifs de Fawakhir, Um Had et Um Effein dans le centre du Désert Oriental égyptien sont des petits corps allongés à circulaires formés de syéno- et monzogranites roses et de monzodiorites grises. Les observations structurales aux contacts intrusifs de ces plutons indiquent qu'il s'agit de lames intrusives marginales subhorizontales, correspondant à des injections de magmas le long de structures planes préexistantes incluant foliations minérales et failles de charriage. L'espace nécessaire à la mise en place de ces plutons granitiques a été accomodé par le bombement des roches environnantes encaissantes dont les contacts extérieurs sont dans le style des laccolites. D'une manière générale, le pluton granitique d'Um Had possède une forme phacolitique contrôlée par un couloir cisaillant mylonitique bombé et à pente sud, qui sépare les roches gneissiques (préservées comme couer du pluton) des unités charriées peu métamorphiques. Les caractéristiques structurales de ces plutons sont en accord avec une mise en place dans la croûte la plus supérieure, à une profondeur où σ3 est vertical. Cette mise en place s'est probablement produite après une transpression NE-SO plutôt que ans un environnement." @default.
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- W2079755082 date "2001-01-01" @default.
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- W2079755082 title "Pan-African granite emplacement mechanisms in the Eastern Desert, Egypt" @default.
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