Petrology, geochemistry and remote sensing data of island arc assemblage along Wadi Abu Marawat, Central Eastern Desert, Egypt

Asran, Amal A.; Bekir, R. Kh.; Rahman, Ezzat Abdel; El-Rashed, A. Abdel

doi:10.1007/s12517-011-0516-z

Cited by 8 publications

(1 citation statement)

References 23 publications

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“…2000;Ramadan et al 2001;Kusky and Ramadan 2002;Ferrier et al 2002;Crosta and Filho 2003;Ramadan and Kontny 2004;Liu et al 2007;Zhang et al 2007;Gabr et al 2010). Remotely sensed processed data including ETM and ASTER have been used by many workers (e.g., Sultan et al 1986;Loughlin 1991;Rokos et al 2000;Abdelsalam and Stern 2000;Ramadan et al 2001;Kusky and Ramadan 2002;Ferrier et al 2002;Crosta and Filho 2003;Sadek 2004Sadek , 2005Ninomiya et al 2005Ninomiya et al , 2006Gad and Kusky 2007;Hasan 2009, 2012a, b;Liu et al 2007;Zhang et al 2007;Amer et al 2010;Gabr et al 2010;Aboelkhair et al 2010;Ali-Bik et al 2012;Abou Elmagd et al 2013;Rajendran et al 2013;Asran et al 2013;Hassan and Ramadan 2014;. None of these studies used the interpreted data of Landsat 8 images in geological studies in the Central Eastern Desert of Egypt.…”

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confidence: 99%

Late Neoproterozoic basement rocks of Kadabora-Suwayqat area, Central Eastern Desert, Egypt: geochemical and remote sensing characterization

2015

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Kadabora-Suwayqat area, in the Central Eastern Desert of Egypt, is built up by a wide variety of non-consanguineous, basement rock units, which represent a tectonostratigraphic suite within the frame of the Late Neoproterozoic, Pan-African Arabian-Nubian Shield. They were developed from different magma sources at varied tectonic settings through subsequent tectono-magmatic processes. They cover a wide compositional range of the Pan-African legend in the Eastern Desert of Egypt comprising ophiolitic, island-arc, and within-plate assemblages. The ophiolitic serpentinites were obducted onto arcrelated metavolcanics and intruded by gabbroic and syn-late to post tectonic granitoids. Geochemically, the precursor of the ophiolitic serpentinites seems to be peridotite (harzburgite). The basic, intermediate, and acidic metavolcanics imply a transitional stage between an island-arc and a proper active continental margin setting. They exhibit with the gabbroic rocks a diagnostic subduction-related island-arc, calc-alkaline affinity. The granitoids comprise both arc-related, calc-alkaline I-type and within-plate, anorogenic A-type varieties. These rocks have been successfully discriminated on Landsat 8 images including Minimum Noise Fraction (MNF; 4, 3, 7), Principal Component Analysis (PCA; PC6, PC2, PC7), and various band ratios (b6/ b2, b6/b7, b6/b5×b4b5) and (b7/b6, b7/b5, b5/b3). ASTER clay index (5×7/6) and silica index (10/13) discriminated the granitoid rocks, while the serpentinite-talc carbonate and metavolcanic rocks are distinguished on the ASTER images of amphibole index (6+9/7+8) and (6/8).

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