Structural development of the Precambrian basement in the Bir Safsaf-Aswân area,SW-Egypt |
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Authors: | Dipl-Min Annette Huth Dr Gerhard Franz |
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Institution: | (1) Present address: Institut für Angew. Geophysik, Petrologie und Lagerstättenforschung, EB 310, Technische Universität Berlin, D-1000 Berlin 12 |
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Abstract: | Structural investigations, especially on quartz c-axis fabrics, combined with petrological work, were carried out in Precambrian rocks from the basement outcrops Bir Safsaf, Gebel el Asr und Gebel Umm Shâghir in the Western Desert in SW Egypt. The principal rock types are migmatites with local mylonite zones. The foliation and shear planes strike WNW-ESE, the axes of the wide and open folds NE-SW to N-S. Investigation of recrystallization features and mineral parageneses lead to P–T-estimates for the different stages of the metamorphic evolution. They range from early granulite facies down to greenschist facies. Quartz-c-axis fabrics of the migmatites and mylonites are similar (crossed-girdle fabrics) but they have a different regional orientation of the strain ellipsoid. Shear zones developed after the main migmatite facies event. The geological evolution of the basement outcrops in Bir Safsaf, Gebel el Asr and Gebel Umm Shâghir is comparable and the whole region is thought to be part of the East Sahara Craton.
Zusammenfassung Strukturuntersuchungen, besonders Quarz-c-Achsen-Regelungen, kombiniert mit petrologischen Arbeiten, wurden an Gesteinen der präkambrischen Grundgebirgsaufschlüsse Bir Safsaf, Gebel el Asr und Gebel Umm Shâghir in der Western Desert, ägypten, durchgeführt. Die hauptsächlich auftretenden Gesteinstypen sind Migmatite mit lokalen Mylonitzonen. Schieferungs- und Scherflächen streichen WNW-ESE, die Achsen der weiten bis offenen Faltung NE-SW bis N-S. Mit Hilfe des Rekristallisationsverhaltens und der Paragenesen werden P-T-Abschätzungen der Metamorphosestadien angegeben. Sie reichen von früher Granulitfazies bis zu später Grünschieferfazies. Die Quarz-c-Achsenregelung in Migmatiten und Myloniten ist ähnlich (Kreuzgürtelregelung), jedoch mit unterschiedlicher regionaler Orientierung des Strainellipsoids. Scherzonen entwickelten sich nach dem migmatitfaziellen Hauptmetamorphose-Ereignis. Die geologische Entwicklung in den Grundgebirgsaufschlüssen von Bir Safsaf, Gebel el Asr und Gebel Umm Shâghir ist vergleichbar und das gesamte Gebiet wird als Teil des Ostsaharakratons angesehen.
Résumé Cette note fait état des résultats de recherches menées dans les aires d'affleurement du socle pré-cambrien de Bir Safsaf, du Jebel al Asr et du Jebel Umm Shâghir, dans le désert occidental d'Egypte; ces recherches ont consisté en l'étude des structures, particulèrement des fabriques des axes c du quartz, combinée avec une étude pétrologique. Les roches sont essentiellement des migmatites accompagnées de zones de mylonites locales. La schistosité et les plans de cisaillement y sont orientés WNW-ESE; elles présentent des plis ouverts dont les axes sont NE-SW à N-S. L'étude des structures de recristallisation et des paragenèses minérales fournit une estimation des conditions (p,t) au cours des stades successifs de l'évolution métamorphique. Ces conditions s'échelonnent du faciès des granulites jusqu'à celui des schistes verts. Les fabriques des axes c du quartz sont les mÊmes dans les migmatites et les mylonites (fabrique à «ceintures croisées»), mais ces roches présentent des orientations régionales différentes de l'ellipsoÏde des déformations. L'événement métamorphique principal à caractère migmatitique a été suivi de la formation de couloirs de cisaillement (shear-zones). L'évolution géologique du socle est comparable dans les trois aires étudiées; l'ensemble est considéré comme faisant partie du craton du Sahara oriental.
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![gcy](/content/l2440240018j3564/xxlarge1075.gif) ![Mcy](/content/l2440240018j3564/xxlarge1052.gif) ![Acy](/content/l2440240018j3564/xxlarge1040.gif) ![tcy](/content/l2440240018j3564/xxlarge1090.gif) ![Icy](/content/l2440240018j3564/xxlarge1048.gif) ![Ocy](/content/l2440240018j3564/xxlarge1054.gif) . ![gcy](/content/l2440240018j3564/xxlarge1075.gif) ![IEcy](/content/l2440240018j3564/xxlarge1045.gif) ![Ocy](/content/l2440240018j3564/xxlarge1054.gif) ![lcy](/content/l2440240018j3564/xxlarge1083.gif) ![Ocy](/content/l2440240018j3564/xxlarge1054.gif) ![gcy](/content/l2440240018j3564/xxlarge1075.gif) ![Icy](/content/l2440240018j3564/xxlarge1048.gif) ![CHcy](/content/l2440240018j3564/xxlarge1063.gif) ![IEcy](/content/l2440240018j3564/xxlarge1045.gif) ![scy](/content/l2440240018j3564/xxlarge1089.gif) ![kcy](/content/l2440240018j3564/xxlarge1082.gif) ![Ocy](/content/l2440240018j3564/xxlarge1054.gif) ![Rcy](/content/l2440240018j3564/xxlarge1056.gif) 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