![]() ![]() The second deformational event D2 produced dominant of sub-horizontal S2 foliation planes accompanied with recumbent isoclinal folds and NW-SE trending L2 lineations. D1 is an upright tight to isoclinal large-scale folds that caused few F1 small-scale folds and a steeply dipping S1 axial plane foliation. Field relations and geometrical analysis of the measured structural data revealed that the study area underwent four successive deformational phases (D1-D4). The enhanced satellite image and the geo-spatial distributions confirm that the Kid belt is essentially composed of nine Precambrian units. ![]() Here, we detect and investigate the signature of the Najd Fault system in South Sinai based on detailed structural analysis in field and digital image processing. It is considered as one of the major belt among the other exposed metamorphic belts in South Sinai. The belt is known as the Kid metamorphic complex. Arnous, Mohamed O.Ī low-to medium-grade metamorphic belt of a volcano-sedimentary succession occurs in the eastern side of South Sinai as a part of the northernmost extension of the Arabian-Nubian Shield in Egypt. Tectonic evolution of kid metamorphic complex and the recognition of Najd fault system in South East Sinai, Egypt Properly regulated land use is recommended for a buffer zone in the northern part of the study area. The absorbed dose rates and gamma-radiation hazard indices in all locations were higher than the world average value and unity, respectively. ![]() The (238)U, (234)Th and (226)Ra isotopes in the (238)U-series are in secular equilibrium. Locations with higher concentrations of (137)Cs are mainly located in the northern part. While relatively higher levels of (238)U, (234)Th, (226)Ra, and (232)Th are associated with the existing monzo-syenogranite, the concentration of (40)K is more uniformly distributed in the studied area. The concentrations of NORM were found to be five to seven-fold that in dune sands in different regions in Sinai. They were subsequently emplaced within an intraplate environment at the end of the Pan-African Orogeny.Įnvironmental assessment of gamma-radiation levels in stream sediments around Sharm El-Sheikh, South Sinai, Egypt.Īl-Sharkawy, A Hiekal, M Th Sherif, M I Badran, H MĪ total surface area of âˆ❁70 km(2) including 28 localities around Sharm El-Sheikh, South Sinai, were investigated by γ-ray spectroscopy. REEs geochemical modeling reveals that the rocks were generated as a result of partial melting and fractionation of lower crust basaltic magma giving rise to A1 and A2 subtype granites. Multi-element variation diagrams and geochemical characteristics reinforce a post-collision tectonic setting. Analysis results portray monzogranites displaying calc-alkaline characteristics and emplaced in island-arc tectonic settings, whereas the syenogranites, alkali-feldspar granites and the riebeckite bearing-granites exhibit an alkaline nature and are enriched in HFSEs similar to granites within an extensional regime. Petrographically, the granitic rocks consist mainly of perthite, plagioclase, quartz, biotite and riebeckite. Numerous felsic, mafic dikes and quartz veins traverse the study granites. The earliest stages include monzogranite and syenogranites while the later stages produced alkali feldspar granites and riebeckite-bearing granites. ![]() South Sinai includes important components of successive multiple stages of upper crust granitic rocks. The granites are widely distributed in the northern part of the Neoproterozoic Arabian-Nubian Shield. Precambrian granites of the Sharm El-Sheikh area in south Sinai, Egypt belong to collisional and post-collisional Magmatism (610-580 Ma). Perogenesis of granites, Sharm El-Sheikh area, South Sinai, Egypt: petrological constrains and tectonic evolution ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |