Publications

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2021
Maurice, A. E., M. K. Azer, P. D. Asimow, F. F. Basta, H. M. Helmy, and T. Shibata, "THE KABR EL-BONAYA PERIDOTITES, SOUTHEASTERN SINAI, EGYPT: PETROLOGY, GEOCHEMISTRY, AND METAMORPHISM OF NEOPROTEROZOIC ARC ULTRAMAFIC CUMULATES", American Journal of Science, vol. 321, issue 10, pp. 1445–1496, 2021.
2019
2018
2017
2016
Mohy, H., I. A. El-Maged, and F. F. Basta, "Newly improved band ratio of ASTER data for lithological mapping of the Fawakhir area, Central Eastern Desert, Egypt", Journal of Indian Society of Remote Sensing, vol. 44, issue 5, pp. 735-746, 2016.
2015
islam abou el-magd. hassan mohy. fawzy basta, "Application of remote sensing for gold exploration in the fawakhir area, sentral eastern desert of egypt", arab j. geosci , vol. 8, pp. 3523-3536, 2015.
2013
Maurice, A. E., B. R. Bakhit, F. F. Basta, and A. A. Khiamy, "Geochemistry of gabbros and granitoids (M- and I-types) from the Nubian Shield of Egypt: Roots of Neoproterozoic intra-oceanic island arc", Precambrian Research, vol. 224, pp. 397 - 411, 2013. Abstract1-s2.0-s0301926812002628-main.pdfWebsite

The Neoproterozoic intrusive rocks of the Wadi Ranga area, Nubian Shield of Egypt, comprise gabbros and granitoids emplaced during oceanic island arc and post-collision stages. The plutonic rocks of the island arc stage include hornblende gabbros (Dabbah pluton), trondhjemite (Abu Ghalaga pluton) and tonalites with subordinate quartz gabbro and quartz diorite (Reidi and Abu Ghusun plutons), whereas the post-collision intrusives include granodiorite and monzogranite (Helifi-Hamata pluton). The gabbros and granitoids of the island arc stage are largely calcic, low-K rocks which have either tholeiitic (gabbro and trondhjemite) or transitional tholeiitic to calcalkaline nature (tonalites). On the other hand, the granitoids of the post-collision stage are medium to high-K calcalkaline rocks. All the investigated granitoids are metaluminous. The spider diagrams, with enrichment in \{LILE\} and strong Nb depletion, and the almost flat to slightly LREE-depleted \{REE\} patterns of the gabbro and trondhjemite are similar to those of the Wadi Ranga low-K tholeiitic basalts and silicic volcanics, respectively, suggesting that the gabbro and trondhjemite are the plutonic equivalents of the Wadi Ranga immature island arc extrusives, and they were derived from mantle source at the early immature island arc stage. Similar to the trondhjemite, the tonalites show \{LILE\} enrichment and strong Nb depletions on the MORB-normalized spider diagrams. However, the tonalites have \{REE\} patterns which are enriched in \{LREE\} (La/Yb = 1.71–5.54). The derivation of the tonalites through fractionation of the same magma produced the trondhjemite seems unlikely. Therefore, high degree partial melting of juvenile basaltic arc crust is favoured for the origin of tonalites during a late immature island arc stage. The post-collision granitoids show considerable enrichment in \{LILE\} and to a lesser extent in HFSE, slight negative Nb anomaly and strong negative P and Ti anomalies relative to N-MORB. Their \{REE\} patterns are LREE-enriched (La/Yb = 5–19), with negative Eu anomaly. These characteristics are consistent with origin through lower degrees of partial melting of old basaltic arc crust and subsequent fractional crystallization. The geochemical characteristics of the trondhjemite and tonalites, and the granodiorite–monzogranite classify them as M-type and I-type granitoids, respectively. The partly tholeiitic intrusives of the Wadi Ranga area (South Eastern Desert) have lower K2O, Rb and \{LREE\} compared to the M-type calcalkaline intrusives of the North Eastern Desert, implying northwardly dipping subduction zone. The geochemical similarities between the intrusives of Neoproterozoic and Phanerozoic oceanic island arcs imply that they share similar style of subduction, which differs from that of the Archaean. The generation of high SiO2 (up to 74.5 wt%), low \{K2O\} (0.56–1.78 wt%) and slightly LREE-depleted trondhjemite in early immature oceanic island arc setting supports the arc origin of the primitive continental crust. Silicic magma production through partial melting of the early arc volcanic rocks during the evolution of the arc and the post-collision stage, drives the middle and upper oceanic arc crust towards a composition closer to that of the continental crust. The present study indicates that the intra-oceanic island arcs continued to play a role in the generation of the continental crust after the Archaean.

2011
Basta, F. F., A. E. Maurice, B. R. Bakhit, K. A. Ali, and W. I. Manton, "Neoproterozoic contaminated MORB of Wadi Ghadir ophiolite, NE Sfrica: Geochemical and Nd and Sr isotopic constraints", Journal of African Earth Sciences, vol. 59, pp. 227-242, 2011.
Basta, F. F., A. E. Maurice, L. Fontbote, and P. - Y. Favarger, "Petrology and Geochemistry of the Banded Iron Formation (BIF) of Wadi Karim and Um Anab, Eastern Desert, Egypt: Implications for the origin of Neoproterozoic BIF", Precambrian Research, vol. 187, pp. 277-292, 2011.
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