Geochemical Characteristics of the Syn-Tectonic Granitoids along Wadi El-Sheikh Area, South Sinai, Egypt. | ||||
| Benha Journal of Applied Sciences | ||||
| Article 17, Volume 8, Issue 5, May 2023, Page 191-210 PDF (1.6 MB) | ||||
| Document Type: Original Research Papers | ||||
| DOI: 10.21608/bjas.2023.205732.1152 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
walaa mahmoud saad  ; moustafa mohamed moghed
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| geology department, faculty of science, benha university | ||||
| Abstract | ||||
| Wadi El-Sheikh area located at south Sinai which, characterized by abundant intrusion of calc-alkaline and alkaline/peralkaline granitoids and their associated volcanic. These granitoids have a particular geodynamic interest as they provide an outstanding opportunity to tell how continental crust of Arabian Nubian Shield (ANS) was formed. Thus, the present study introduces new detailed geological field studies, Petrological, and whole rock geochemical data for a selection of I-type granitoids along Wadi El- Sheikh. The older granitoids (OG) ranging in composition from quartz diorite, tonalite to granodiorite. Geochemically, this OG are mainly metaluminous, calc-alkaline and I-type and belonging to syn-collision volcanic arc granitoids. The studied granitoid rocks show high CaO/Na2O ratios (0.33 - 1.44) being a decrease from quartz diorite to granodiorites, whereas they have also high Al2O3/TiO2 ratios (17.85 – 80.70) increasing toward the higher silica granitic type (granodiorite). These characters indicate that emplacements of OG were strongly affected by magma mixing of felsic and mafic melts. Depth of magma segregation indicate that the studied granitoids have generated at water pressure in the 0.5 –10 kbar and temperatures of about 650ºC - 700ºC, and have been generated at greater depth >30 km of the lower crust. The studied OG are generally characterized by enrichment of LILE and LREE and depletion of HFSE relative to N-MORB values (e.g., negative Nb and Ta anomalies). | ||||
| Keywords | ||||
| Wadi El-Sheikh; Syn-tectonic; ANS; depth of magma segregation | ||||
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