EPMA and LA-ICP-MS Data of Clinopyroxene and Chromite from the Wadi Ghadir Ophiolites, Eastern Desert, Egypt
Zoheir, B., Khalil, A., Feigenson, M., Diab, A. (2020). EPMA and LA-ICP-MS Data of Clinopyroxene and Chromite from the Wadi Ghadir Ophiolites, Eastern Desert, Egypt. EKB Journal Management System, 5(Issue 2 part (1)), 169-182. doi: 10.21608/bjas.2020.135455
B.A. Zoheir; A.A. Khalil; M.D. Feigenson; A.S. Diab. "EPMA and LA-ICP-MS Data of Clinopyroxene and Chromite from the Wadi Ghadir Ophiolites, Eastern Desert, Egypt". EKB Journal Management System, 5, Issue 2 part (1), 2020, 169-182. doi: 10.21608/bjas.2020.135455
Zoheir, B., Khalil, A., Feigenson, M., Diab, A. (2020). 'EPMA and LA-ICP-MS Data of Clinopyroxene and Chromite from the Wadi Ghadir Ophiolites, Eastern Desert, Egypt', EKB Journal Management System, 5(Issue 2 part (1)), pp. 169-182. doi: 10.21608/bjas.2020.135455
Zoheir, B., Khalil, A., Feigenson, M., Diab, A. EPMA and LA-ICP-MS Data of Clinopyroxene and Chromite from the Wadi Ghadir Ophiolites, Eastern Desert, Egypt. EKB Journal Management System, 2020; 5(Issue 2 part (1)): 169-182. doi: 10.21608/bjas.2020.135455

EPMA and LA-ICP-MS Data of Clinopyroxene and Chromite from the Wadi Ghadir Ophiolites, Eastern Desert, Egypt

Benha Journal of Applied Sciences
Article 25, Volume 5, Issue 2 part (1), February 2020, Page 169-182  XML PDF (1.43 MB)
Document Type: Original Research Papers
DOI: 10.21608/bjas.2020.135455
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Authors
B.A. Zoheir1; A.A. Khalil2; M.D. Feigenson3; A.S. Diab4
1Geology Dept., Faculty of Science, Benha Univ., Benha, Egypt Institute of Geosciences, Kiel Univ., D-24118 Kiel, Germany
2Institute of Geosciences, Kiel Univ., D-24118 Kiel, Germany
3Earth and Planetary Sciences Dept., Wright-Rieman Labs, Rutgers Univ., Piscataway, NJ, USA
4Geology Dept., Faculty of Science, Benha Univ., Benha, Egypt
Abstract
New EPMA and LA-ICP-MS data of pyroxene and chromite are used to assess the so far published tectonic setting of Wadi Ghadir Ophiolite (WGO) in the Central Eastern Desert of Egypt. The low contents of TiO2 (< 0.46 wt%) and high MgO (13.39-15.17 wt%) concentrations in the analyzed clinopyroxene suggest a depleted residual mantle source material. The trace element composition and REE patterns reflect transitional IAT-boninitic geochemical affinities in a supra-subduction zone setting. Chromite, on the other hand, shows high Cr#(Cr/(Cr+Al)) (0.83-0.88 mol) and relatively constant Mg#(Mg/(Mg+Fe+2)) (0.66-0.70 mol), indicating a high degree of partial melting of the uPP.er mantle source. These features are typical for supra-subduction zone in a back-arc or inter‐arc basin setting. The micro-analytical data of relict magmatic mineral phases in the WGO and other ophiolitic rocks in the Arabian-Nubian Shield can help in interpreting their precise tectonic setting as far as data of the immobile, incompatible elements are used.
Keywords
EPMA; LA-ICP-MS; Pyroxene; Chromite; Ophiolites; Wadi Ghadir; Eastern Desert; Egypt
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