Mineral chemistry, geochemistry, Raman spectroscopy and geotectonic significance of Neoproterozoic ophiolitic peridotites and pyroxenites from Kab Amiri district, central Eastern Desert, Egypt
Kharbish, S., Amer, O., El-Awady, A. (2020). Mineral chemistry, geochemistry, Raman spectroscopy and geotectonic significance of Neoproterozoic ophiolitic peridotites and pyroxenites from Kab Amiri district, central Eastern Desert, Egypt. EKB Journal Management System, 1(1), 30-45. doi: 10.21608/fsrt.2020.19309.1002
Sherif Kharbish; Omar Amer; Amr El-Awady. "Mineral chemistry, geochemistry, Raman spectroscopy and geotectonic significance of Neoproterozoic ophiolitic peridotites and pyroxenites from Kab Amiri district, central Eastern Desert, Egypt". EKB Journal Management System, 1, 1, 2020, 30-45. doi: 10.21608/fsrt.2020.19309.1002
Kharbish, S., Amer, O., El-Awady, A. (2020). 'Mineral chemistry, geochemistry, Raman spectroscopy and geotectonic significance of Neoproterozoic ophiolitic peridotites and pyroxenites from Kab Amiri district, central Eastern Desert, Egypt', EKB Journal Management System, 1(1), pp. 30-45. doi: 10.21608/fsrt.2020.19309.1002
Kharbish, S., Amer, O., El-Awady, A. Mineral chemistry, geochemistry, Raman spectroscopy and geotectonic significance of Neoproterozoic ophiolitic peridotites and pyroxenites from Kab Amiri district, central Eastern Desert, Egypt. EKB Journal Management System, 2020; 1(1): 30-45. doi: 10.21608/fsrt.2020.19309.1002

Mineral chemistry, geochemistry, Raman spectroscopy and geotectonic significance of Neoproterozoic ophiolitic peridotites and pyroxenites from Kab Amiri district, central Eastern Desert, Egypt

Frontiers in Scientific Research and Technology
Article 4, Volume 1, Issue 1, 2020, Page 30-45  XML PDF (2.34 MB)
Document Type: Original Article
DOI: 10.21608/fsrt.2020.19309.1002
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Authors
Sherif Kharbish email 1; Omar Amer2; Amr El-Awady2
1Suez University, Faculty of Science, Egypt
2Geology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
Abstract
The small gold mining Kab Amiri district ultramafic ophiolitic section (central Eastern Desert) comprises highly serpentinized peridotites (serpentinites) and few pyroxenites. It lies within a region of Neoproterozoic ophiolitic rocks and associated derivatives. The chromian spinel textural and chemical compositional features suggest transitional greenschist-amphibolite up to lower amphibolite facies metamorphism and indicates that they represent highly-depleted mantle residues. The presence of the Si-Ob-Si antisymmetric ν1(A1), symmetric ν2(A1) bands and the hydroxyl group (OH) modes are conclusive for the discrimination of antigorite. Furthermore, the speculation of serpentines as antigorite can also be indicated from the hydroxyl group modes. The Kab Amiri ophiolite suite (central Eastern Desert) represents fragments of oceanic lithosphere that are developed in forearc setting in a supra-subduction zone (SSZ) environment. Thus the low TiO2 contents, the enrichment in LILE and LREE and the Nb depletion reflect the remelting of a highly depleted mantle source and suggest their formation in a SSZ environment (i.e forearc).
Keywords
Neoproterozoic; ophiolites; forearc; Raman spectroscopy; Egypt
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