Abstract
The late Neoproterozoic gabbro/diorite intrusion (~11.7 km2) at Sheikh El-Arab area represents the only mafic exposure in the basement rocks of Katharina province of central Sinai largely occupied by granitoids and their volcanic equivalents. The field relations indicate that the intrusion is younger than the lower unit (630–615 Ma) of the volcanics and clastics of the Rutig Formation, and older than the surrounding granodiorites of Sheikh El-Arab and Rahaba (~610 Ma) plutons. It is not affected by regional metamorphism or ductile deformation, but recorded petrographic uralitization/amphibolitization signature. It is composed chiefly of pyroxene-hornblende gabbro, diorite, and quartz diorite. The chemical composition of the mafic minerals indicated that the suite was derived from calc-alkaline magma. Geochemically, the studied rocks are characterized by enrichment of LILE relative to HFSE and LREE relative to HREE. The gabbros are notably low in total REE (38–56 ppm) with (La/Yb) n = 2.7–4.8, while the dioritic rocks are high in ΣREE (142–161 ppm) with high (La/Yb) n values (12.5–15.8); both are characterized by the absence of Eu anomaly, their Eu/Eu* ratios are close to unity (0.93–1.11). The studied intrusion evolved from mafic mantle magma into different types by assimilation fractional crystallization process (AFC) and/or gradual decrease in oxygen fugacity. The initial magma corresponds, most probably, to pyroxene-hornblende gabbro and the crystallization of hornblende was ascribed by slight H2O increase in magma after crystallization of near-liquidus clinopyroxene with high Ca content (Wo42–52) and Ca-rich plagioclase (An80–83). The intrusion is related to the later calc-alkaline substage of post-collisional tectonic setting.
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References
Abdel-Karim AM (2013) Petrology, geochemistry and petrogenetic aspects of younger gabbros from south Sinai: a transition from arc to active continental margin. Chem Erde 73:89–104
Abdel-Rahman AM (1994) Nature of biotites from alkaline, calc-alkaline and peraluminous magmas. J Petrol 35:525–541
Abdel-Rahman AM (1995) Tectonic-magmatic stages of shield evolution: the Pan-African belt in northeastern Egypt. Technophysics 242: 223–240
Abu Anbar MM (2009) Petrogenesis of the Nesryin gabbroic intrusion in SW Sinai, Egypt: new contributions from mineralogy, geochemistry, Nd and Sr isotopes. Mineral Petrol 95:87–103
Azer MK (2007) Tectonic significance of late Precambrian calc-alkaline and alkaline magmatism in Saint Katherina area, South Sinai, Egypt. Geol Acta 5:255–272
Azer MK, El-Gharbawy RI (2011) Contribution to the Neoproterozoic layered mafic-ultramafic intrusion of Gabal Imleih, south Sinai, Egypt: implication of post-collisional magmatism in the north Arabian-Nubian Shield. J Afr Earth Sci 60:253–272
Azer MK, Abu El-Ela FF, Ren M (2012) The petrogenesis of late Neoproterozoic mafic dyke-like intrusion in south Sinai, Egypt. J Asia Earth Sci 54–55:91–109
Basta EZ, Takla MA (1974) Distribution of opaque minerals and the origin of the gabbroic rocks of Egypt. Bull Fac Sci Cairo Univ 47:347–364
Be’eri-Shlevin Y, Katzir Y, Whitehouse M (2009a) Post-collisional tectono-magmatic evolution in the northern Arabian-Nubian Shield: time constraints from ion-probe U-Pb dating of zircon. J Geol Soc Lond 166:71–85
Be’eri-Shlevin Y, Katzir Y, Valley JW (2009b) Crustal evolution and recycling in a juvenile continent: oxygen isotope ratio of zircon in the northern Arabian Nubian Shield. Lithos 107:169–184
Be’eri-Shlevin Y, Samuel MD, Azer MK, Rämöِ OT, Whitehouse MJ, Moussa HE (2011) The Ediacaran Ferani and Rutig volcano-sedimentary successions of the northernmost Arabian-Nubian Shield (ANS): new insights from zircon U-Pb geochronology, geochemistry and O-Nd isotope ratios. Precambrian Res 188:21–44
Bentor YK (1985) The crust evolution of the Arabo-Nubian Massif with special reference to the Sinai Peninsula. Precambrian Res 28:1–74
Beyth M, Stern RJ, Altherr R, Kröner A (1994) The late Precambrian Timna igneous complex, southern Israel: evidence for comagmatic-type sanukioid monzodiorite and alkali granite magma. Lithos 31:103–124
Blasband B, White SH, Brooijmans P, Visser W, de Boorder H (2000) Late Proterozoic extensional collapse in the Arabian-Nubian Shield. J Geol Soc Lond 157:615–628
Condie KC (1997) Plate tectonics and crustal evolution, 4th edn. Butterworth-Heinemann, Oxford, p 282
Cox KG, Bell JD, Pankhurst RJ (1979) The interpretation of igneous rocks. Allen and Unwin, London, p 450
El-Gaby S (2007) Integrated classification and evolution of the Neoproterozoic Pan-African belt in Egypt. Int Conf Geol Afr 1:143–154
El-Gaby S, List FK, Tehrani R (1988) Geology, evolution and metallogenesis of the Pan-African belt in Egypt. In: El-Gaby S, Greiling R (eds) The Pan-African belt of NE Africa and adjacent areas tectonic evolution and economic aspects. Vieweg, Braunschweig, Wiesbaden, pp 17–68
El-Gaby S, List FK, Tehrani R (1990) The basement complex of the Eastern Desert and Sinai. In: Said R (ed) The geology of Egypt. Balkema, Rotterdam, pp 175–184
El-Sayed MM (2003) Neoproterozoic magmatism in NW Sinai, Egypt: magma source and evolution of collision-related intracrustal anatectic leucogranite. Int J Earth Sci (Geol Rundsch) 92:145–164
Essawy MA, El-Metwally AA, Katta LA, Darwish NK (1997) Younger granites and pegmatites from Taba area, southeastern Sinai, Egypt. Egypt J Geol 41:495–518
Eyal M, Bartov Y, Shimron AE, Bentor YK (1980) Sinai geological map, aeromagmatic map. Geol Surv Israel 1:500,000, 1 sheet, scale
Eyal M, Litvinovsky B, Jahn BM, Zanvilevich A, Katzir Y (2010) Origin and evolution of post-collisional magmatism: coeval Neoproterozoic calc-alkaline and alkaline suites of the Sinai Peninsula. Chem Geol 269:153–179
Eyal M, Bentor YK, Goor A, Bruner I, Eyal Y, Calvo R, Hall JK, Rosensaft M (2013) Geological map of Katherina ring complex, Sinai, Egypt. Geol Surv Israel 1:50,000, 1 sheet, scale
Eyal M, Be’eri-Shlevin Y, Eyal Y, Whitehouse MJ, Litvinovsky B (2014) Three successive Proterozoic island arcs in the northern Arabian-Nubian Shield: evidence from SIMS U-Pb dating of zircon. Gondwana Res 25:338–351
Farahat ES, Zaki R, Hauzenberger C, Sami M (2011) The Neoproterozoic calcalkaline peraluminous granitoids of the Deleihimmi pluton, Central Eastern Desert, Egypt: implications for transition from late- to post-collisional tectonomagmatic evolution in the northern Arabian-Nubian Shield. Geol J 46:544–560
Friz-Töpfer A (1991) Geochemical characterization of Pan-African dyke swarms in southern Sinai: from continental margin to intraplate magmatism. Precambrian Res 49:281–300
Girardeau J, Mevel C (1982) Amphibolitized sheared gabbros from ophiolites as indicators of the evolution of the oceanic crust: bay of islands, Newfoundland. Earth Planet Sci Lett 61:151–165
IUGS (1989) In: Le Maitre RW (ed) A classification of igneous rocks and glossary of terms: recommendations of the international union of geological sciences sub-commission on the systematics of igneous rocks. Blackwell, Oxford, p 193
Jarrar GH, Stern RJ, Saffarini G, Al-Zubi H (2003) Late and post-orogenic Neoproterozoic intrusions of Jordan: implications for crustal growth in the northernmost segment of the East African Orogen. Precambrian Res 123:295–319
Johnson PR, Woldehaimanot B (2003) Development of the Arabian-Nubian shield: perspectives on accretion and deformation in the northern East African Orogen and the assembly of Gondwana. In: Yoshida M, Windley BF, Dasgupta S (eds) Proterozoic East Gondwana: Supercontinent Assembly and Breakup: Spec Pub. Geol Soc London 206, pp. 289–326
Johnston AD, Wyllie PJ (1988) Interaction of granitic and basic magmas: experimental observations on contamination processes at 10 kbar with H2O. Contrib Mineral Petrol 98:352–362
Kröner A (1985) Ophiolites and the evolution of tectonic boundaries in late Proterozoic Arabian-Nubian Shield of Northeast Africa and Arabia. Precambrian Res 27:277–300
Le Bas MJ (1962) The role of aluminum in igneous clinopyroxenes with relation to their parentage. Am J Sci 260:267–288
Leake BE (1997) Nomenclature of amphiboles: report of the subcommittee on amphiboles of the international mineralogical association commission on new minerals and mineral names. Mineral Mag 61:295–321
Meert JG (2003) A synopsis of events related to the assembly of eastern Gondwana. Teconophy 362:1–40
Middlemost EAK (1997) Magmas, rocks and planetary development. Longman, 299 p
Miyashiro A (1978) Nature of alkalic rock series. Contrib Mineral Petrol 66:91–104
Moghazi AM (2002) Petrology and geochemistry of Pan-African granitoids, Kab Amiri area, Egypt—implications for tectonomagmatic stages of the Nubian Shield evolution. Mineral Petrol 75:41–67
Moghazi AM, Andersen T, Oweiss GA, El-Bouseily AM (1998) Geochemical and Sr-Nd-Pb isotopic data bearing on the origin of Pan-African granitoids in the Kid area, southeast Sinai, Egypt. J Geol Soc Lond 155:697–710
Moreno JA, Montero P, Abu Anbar M, Molina JF, Scarrow JH, Talavera C, Cambeses A, Bea F (2012) SHRIMP U-Pb zircon dating of the Katerina ring complex: insights into the temporal sequence of Ediacaran calc-alkaline to peralkaline magmatism in southern Sinai, Egypt. Gondwana Res 12:887–900
Morimoto N (1988) Nomenclature of pyroxenes. Mineral Petrol 39:55–76
Moussa EMM, Stern RJ, Manton WI, Ali KA (2008) SHRIMP zircon dating and Sm/Nd isotopic investigations of Neoproterozoic granitoids, Eastern Desert Egypt. Precambrian Res 160:341–356
Pearce JA (1983) Role of the subcontinental lithosphere in magma genesis at active continental margins. In: Hawkesworth CJ, Norry MJ (eds) Continental basalts and mantle xenoliths. Shiva, Nantwich, pp 230–249
Richard LR (1995) Mineralogical and petrological data processing system. minpet software (c) 1988–1995, Version 2.02
Rickwood PC (1989) Boundary lines within petrologic diagrams which use oxides of major and minor elements. Lithos 22:247–263
Rollinson H (1993) Using geochemical data: evaluation, presentation, interpretation. Longman Scientific & Technical—Wiley, New York, p 352
Samuel MD, Be’eri-Shlevin Y, Azer MK, Whitehouse MJ, Moussa HE (2011) Provenance of conglomerate clasts from the volcano-sedimentary sequence at Wadi Rutig in southern Sinai, Egypt as revealed by SIMS U-Pb dating of zircon. Gondwana Res 20:450–464
Sisson TW, Grove TL (1993) Experimental investigations of the role of H2O in calc-alkaline differentiation and subduction zone magmatism. Contrib Mineral Petrol 113:143–166
Soliman F (1996) Geology of Wadi Tarfa-Wadi Isla region, southern Sinai, Egypt. M.E.R.C. Ain Shams Univ: Earth Sci Ser 10:214–228
Stein M, Navon O, Kessel R (1997) Chromatographic metasomatism of the Arabian-Nubian lithosphere. Earth Planet Sci Lett 152:75–91
Stern RJ (1994) Arc assembly and continental collision in the Neoproterozoic East African orogen. Implications for the consolidation of Gondwanaland. Ann Rev Earth Planet Sci 22:319–351
Stern RJ, Abdelsalam MG (1998) Formation of continental crust in the Arabian-Nubian Shield: evidence from granitic rocks of the Nakasib suture, NE Sudan. Geol Rdsch 87:150–260
Stern RJ, Hedge CE (1985) Geochronologic and isotopic constraints on late Precambrian crustal evolution in the Eastern Desert of Egypt. Am J Sci 285:97–127
Stoeser DB, Camp VE (1985) Pan-African microplate accretion of Arabian shield. Geol Soc Am Bull 96:817–826
Stoeser DB, Frost CD (2006) Nd, Pb, Sr, and O isotopic characterization of Saudi Arabian Shield terranes. Chem Geol 226:163–188
Stromer JC Jr (1983) The effects of recalculation on estimates of temperature and oxygen fugacity from analyses of multicomponent iron-titanium oxides. Am Miner 68:586–594
Sun S, McDonough WF (1989) Chemical and isotopic systematics of the oceanic basalts: implications for mantle composition and processes. Magmatism in the Ocean Basins. In: Saunders AD, Norry MJ (eds) Geol Soc London, Spec Publ 42, pp. 313–345.
Takla MA (2002) Economic potentialities of the Shield and Phanerozoic rocks of Egypt. 6th Inter Conf Geol Arab World, Cairo Univ XXXII–XXXIII
Takla MA, Basta EZ, Fawzi E (1981) Characterization of the older and younger gabbros of Egypt. Delta J Sci 5:279–314
Takla MA, Basta FF, Madbouly MI, Hussein AA (2001) The mafic-ultramafic intrusions of Sinai, Egypt. Ann Geol Surv Egypt 24:1–40
Urlych J, Cimbálníkova A, Fiala J, Kaspar P, Lang M, Minarík L, Palivcová M, Pivec E (1976) Petrology of the Petrovice melagabbro. Rozpr Cs Akad Ved R mat Prír Ved Academia, Praha, p 57
Whalen JB (1985) Geochemistry of an island-arc plutonic suite: the Vasilau-Yau Yau intrusive complex, New Britain, P.N.G. J Petrol 26:603–632
Wilson M (1994) Igneous petrogenesis. Chapman and Hall, London, p 466
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The facilities offered by the Institute of Mineralogy, Claustal University, Germany for EPMA, are greatly appreciated. We are grateful to the remarks from the anonymous reviewer who improved the manuscript.
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Samuel, M.D., Sadek Ghabrial, D., Moussa, H.E. et al. The petrogenesis of late Neoproterozoic gabbro/diorite intrusion at Sheikh El-Arab area, central Sinai, Egypt. Arab J Geosci 8, 5579–5599 (2015). https://doi.org/10.1007/s12517-014-1652-z
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DOI: https://doi.org/10.1007/s12517-014-1652-z