International Journal of Earth Sciences

, Volume 107, Issue 7, pp 2337–2355 | Cite as

Mineral chemistry and geochemistry of ophiolitic metaultramafics from Um Halham and Fawakhir, Central Eastern Desert, Egypt

  • Abdel-Aal M. Abdel-Karim
  • Shehata Ali
  • Shaimaa A. El-Shafei
Original Paper


This study is focused on ophiolitic metaultramafics from Um Halham and Fawakhir, Central Eastern Desert of Egypt. The rocks include serpentinized peridotites, serpentinites together with talc– and quartz–carbonates. The primary spinel relict is Al–chromite [Cr# > 60], which is replaced by Cr–magnetite during metamorphism. The high Cr# of Al–chromites resembles supra-subduction zone (SSZ) peridotites and suggests derivation from the deeper portion of the mantle section with boninitic affinity. These mantle rocks equilibrated with boninitic melt have been generated by high melting degrees. The estimated melting degrees (~ 19–24%) lie within the range of SSZ peridotites. The high Cr# of spinel and Fo content of olivine together with the narrow compositional range suggest a mantle residual origin. Serpentinized peridotite and serpentinites have low Al2O3/SiO2 ratios (mostly < 0.03) like fore-arc mantle wedge serpentinites and further indicate that their mantle protolith had experienced partial melting before serpentinization process. Moreover, they have very low Nb, Ta, Zr and Hf concentrations along with sub-chondritic Nb/Ta (0.3–16) and Zr/Hf (mostly 1–20) ratios further confirming that their mantle source was depleted by earlier melting extraction event. The high chondrite normalized (La/Sm)N ratios (average 10) reflect input of subduction-related slab melts/fluids into their mantle source.


Ophiolite Fore-arc Fawakhir Um Halham Egypt 



Many thanks to H.M. Helmy who kindly carried out the XRF analyses of the Major elements during his stay in Japan. Critical comments and constructive reviews by M.K. Azer and an anonymous referee and by editor, Wolf-Christian Dullo, substantially improved an early version of this manuscript.

Supplementary material

531_2018_1601_MOESM1_ESM.xlsx (21 kb)
Supplementary material 1 (XLSX 21 KB)


  1. Abd El-Rahman Y, Polat A, Dilek Y, Fryer BJ, El-Sharkawy M, Sakran S (2009a) Geochemistry and tectonic evolution of the Neoproterozoic incipient arc–forearc crust in the Fawakhir area, Central Eastern Desert, Egypt. Precambr Res 175:116–134CrossRefGoogle Scholar
  2. Abd El-Rahman Y, Polat A, Dilek Y, Fryer BJ, El-Sharkawy M, Sakran S (2009b) Geochemistry and tectonic evolution of the Neoproterozoic Wadi Ghadir ophiolite, Eastern Desert. Egypt Lithos 113:158–178CrossRefGoogle Scholar
  3. Abd El-Rahman Y, Ploat A, Dilek Y, Kusky T, El-Sharkawy M, Said A (2012) Cryogenian ophiolite tectonics and metallogeny of the Central Eastern Desert of Egypt. Int Geol Rev 54(16):1870–1884CrossRefGoogle Scholar
  4. Abd El-Salam MG, Stern RJ (1996) Sutures and shear zones in the Arabian-Nubian Shield. J Afr Earth Sci 23:289–310CrossRefGoogle Scholar
  5. Abdel-Karim AM, Ahmed Z (2010) Possible origin of the ophiolites of Eastern Desert of Egypt, from geochemical prospectives. Arab J Sci Eng 34:1–27Google Scholar
  6. Abdel-Karim AM, El-Mahallawi MM, Finger F (1996) The ophiolite mélange of Wadi Dunqash and Wadi Arayis, Eastern Desert of Egypt: petrogenesis and tectonic evolution. Acta Mineral Petrogr 37:129–141Google Scholar
  7. Abdel-Karim AM, Azzaz SA, Moharem AF, El-Alfy H (2008) Petrological and geochemical studies on the ophiolite and island arc association of Wadi Hammaryia, Egypt. Arab J Sci Eng 33(1C):117–138Google Scholar
  8. Abdel-Karim AM, Ali S, Helmy HM, El-Shafei SA (2015) Mantle rocks from Neoproterozoic Gerf ophiolite, South Eastern Desert, Egypt: a case for a possible boninitic fore-arc oceanic fragment. The second International Conference on New Horizons in Basic and Applied Science, 1–6 August 2015, Hurghada, EgyptGoogle Scholar
  9. Abdel-Karim AM, Ali S, Helmy HM, El-Shafei SA (2016) Fore-arc setting of the Gerf ophiolite, Eastern Desert, Egypt: evidence from mineral chemistry and geochemistry of ultramafites. Lithos 263:52–65CrossRefGoogle Scholar
  10. Abdel-Karim AM, Ali S, El-Shafei SA (2017) Mineral chemistry and geochemistry of ophiolitic ultramafics from central Eastern Desert, Egypt: a case for contaminated mantle-derived magma. Geophysical Research Abstracts Vol. 19, EGU2017-16680-1, EGU General Assembly 2017Google Scholar
  11. Abu El-Ela FF (1990) Bimodel volcanism of volcanosedimentary sequence around Gabal Um Halham, central Eastern Desert, Egypt. Bull Fac Sci Assiut Univ 19:37–60Google Scholar
  12. Ahmed AH, Habtoor A (2015) Heterogeneously depleted Precambrian lithosphere deduced from mantle peridotites and associated chromitite deposits of Al’Ays ophiolite, Northwestern Arabian Shield, Saudi Arabia. Ore Geol Rev 67:279–296CrossRefGoogle Scholar
  13. Ahmed AH, Arai S, Attia A (2001) Petrological characteristics of podiform chromitites and associated peridotites of the Pan African Proterozoic ophiolite complexes of Egypt. Miner Deposita 36:72–84CrossRefGoogle Scholar
  14. Ahmed AH, Gharib ME, Arai S (2012) Characterization of the thermally metamorphosed mantle–crust transition zone of the Neoproterozoic ophiolite at Gebel Mudarjaj, south Eastern Desert, Egypt. Lithos 142–143:67–83CrossRefGoogle Scholar
  15. Andresen A, Abu El-Rus MA, Myhre PI, Boghdady GY, Coru F (2009) U-Pb TIMS age constraints on the evolution of the Neoproterozoic Meatiq Gneiss Dome, Eastern Desert, Egypt. Int J Earth Sci 98:481–497CrossRefGoogle Scholar
  16. Anzil PA, Guereschi AB, Martino RD (2012) Mineral chemistry and geothermometry using relict primary minerals in the La Cocha ultramafic body: a slice of the upper mantle in the Sierra Chica of Cordoba, Sierras Pampeanas, Argentina. J S Am Earth Sci 40:38–52CrossRefGoogle Scholar
  17. Arai S (1992) Chemistry of chromian spinel in volcanic rocks as a potential guide to magma chemistry. Mineral Mag 56:173–184CrossRefGoogle Scholar
  18. Arai S (1994) Compositional variation of olivine-chromain spinel in Mg-rich magmas as a guide to their residual spinel peridotites. J Volcanol Geoth Res 59:279–294CrossRefGoogle Scholar
  19. Azer MK, Khalil AES (2005) Petrological and mineralogical studies of Pan-African serpentinites at Bir Al-Edeid area, central Eastern Desert, Egypt. J Afr Earth Sci 43:525–536CrossRefGoogle Scholar
  20. Azer MK, Stern RJ (2007) Neoproterozoic (835–720 Ma) serpentinites in the Eastern Desert, Egypt: fragments of fore-arc mantle. J Geol 115:457–472CrossRefGoogle Scholar
  21. Azer MK, Samuel MD, Ali KA, Gahlan HA, Stern RJ, Ren M, Moussa HE (2013) Neoproterozoic ophiolitic peridotites along the Allaqi–Heiani Suture, South Eastern Desert, Egypt. Mineral Petrol 107(5):829–848CrossRefGoogle Scholar
  22. Aziz NRH, Aswad KJA, Koyi HA (2011) Contrasting settings of serpentinite bodies in the northwestern Zagros Suture Zone, Kurdistan region, Iraq. Geol Mag 148:819–837CrossRefGoogle Scholar
  23. Barnes SI (2000) Chromite in Komatiites, II. Modification during Greenschist to Mid Amphibolite Facies Metamorphism. J Petrol 41:387–409CrossRefGoogle Scholar
  24. Beccaluva L, Macciota G, Piccardo GB, Zeda O (1989) Clinopyroxene composition of ophiolitic basalts as petrogenetic indicator. Chem Geol 77:165–182CrossRefGoogle Scholar
  25. Bloomer SH, Taylor B, Macleod CJ et al. (1995) Early arc volcanism and ophiolite problem: a perspective from drilling in the Western Pacific. In: Taylor B, Natland J (eds) Active margins and marginal basins of the western Pacific. Geophys Monogr 88: 1–30Google Scholar
  26. Bodinier JL, Godard M (2003) Orogenic, ophiolitic, and abyssal peridotites. In: Carlson RW (ed), Treatise on geochemistry mantle and core: treatise on geochemistry, 2 edn. Elsevier Science Ltd, Amsterdam, pp 103–170Google Scholar
  27. Bonatti E, Michael PJ (1989) Mantle peridotites from continental rifts to oceanic basins to subduction zones. Earth Planet Sci Lett 91:297–311CrossRefGoogle Scholar
  28. Boskabadi A, Pitcairn IK, Broman C, Boyce A, Teagle DAH, Cooper MJ, Azer MK, Stern RJ, Mohamed FH, Majka J (2017) Carbonate alteration of ophiolitic rocks in the Arabian-Nubian Shield of Egypt: sources and compositions of the carbonating fluid and implications for the formation of Au deposits. Int Geol Rev 59(4):391–419CrossRefGoogle Scholar
  29. Chalot-Prat F, Ganne J, Lombard A (2003) No significant element transfer from the oceanic plate to the mantle wedge during subduction and exhumation of the Tethys lithosphere (Western Alps). Lithos 69:69–103CrossRefGoogle Scholar
  30. Choi SH, Shervais JW, Mukasa SB (2008) Supra-subduction and abyssal mantle peridotites of the coast range ophiolite, California. Contrib Miner Petrol 156:551–576CrossRefGoogle Scholar
  31. Dai J, Wang C, Hébert R, Santosh M, Li Y, Xu J (2011) Petrology and geochemistry of peridotites in the Zhongba ophiolite, Yarlung Zangbo Suture Zone: implications for the Early Cretaceous intraoceanic subduction zone within the Neo-Tethys. Chem Geol 288:133–148CrossRefGoogle Scholar
  32. Dai J, Wang C, Polat A, Santosh M, Li Y, Ge Y (2013) Rapid forearc spreading between 130 and 120 Ma: evidence from geochronology and geochemistry of the Xigaze ophiolite, southern Tibet. Lithos 172–173:1–16CrossRefGoogle Scholar
  33. Delavari M, Amini S, Saccani E, Beccaluva L (2009) Geochemistry and petrogenesis of mantle peridotites from the Nehbandan Ophiolitic Complex, eastern Iran. J App Sci 9(15):2671–2687CrossRefGoogle Scholar
  34. Deschamps F, Guillot S, Godard M, Chauvel C, Andreani M, Hattori K (2010) In situ characterization of serpentinites from forearc mantle wedges: timing of serpentinization and behavior of fluid-mobile elements in subduction zones. Chem Geol 269:262–277CrossRefGoogle Scholar
  35. Deschamps F, Godar M, Guillot S, Hattori K (2013) Geochemistry of subduction zone serpentinites: a review. Lithos 178:96–127CrossRefGoogle Scholar
  36. Dick HJ, Bullen T (1984) Chromian spinel as a petrogenetic indicator in abyssal and alpine type peridotites and spatially associated lavas. Contrib Mineral Petrol 86:51–76CrossRefGoogle Scholar
  37. El Bahariya GA (2008) Geology, mineral chemistry and petrogenesis of Neoproterozoic metamorphosed ophiolitic ultramafics, Central Eastern Desert, Egypt: implication for the classification and origin of the ophiolitic mélange. Egypt J Geol 52:55–81Google Scholar
  38. El Bahariya GA (2012) Classification and origin of the Neoproterozoic ophiolitic mélanges in the Central Eastern Desert of Egypt. Tectonophysics 568:357–370CrossRefGoogle Scholar
  39. El Bahariya GA, Arai S (2003) Petrology and origin of Pan-African serpentinites with particular reference to chromian spinel compositions, Eastern Desert, Egypt: implication for supra-subduction zone ophiolite. Third International Conference on the Geology of Africa, Assiut University, Egypt, 371–388Google Scholar
  40. El-Bayoumi R (1980) Ophiolites and associated rocks of Wadi Ghadir, East of Gebel Zabara, Eastern Desert, Egypt. Ph.D. thesis, Cairo UniversityGoogle Scholar
  41. El-Gaby S (2005) Integrated evolution and rock classification of the Pan-African belt in Egypt. First symposium on the classification of the basement complex of Egypt. Bull Fac Sci, Assiut University, 1–9Google Scholar
  42. El-Sayed MM, Furnes H, Mohamed FH (1999) Geochemical constraints on the tectonomagmatic evolution of the late Precambrian Fawakhir ophiolite, central Eastern Desert, Egypt. J Afr Earth Sci 29:515–533CrossRefGoogle Scholar
  43. El-Sharkawy MA, El-Bayoumi R (1979) The ophiolites of Wadi Ghadir area, Eastern Desert, Egypt. Ann Geol Surv Egypt 9:125–135Google Scholar
  44. Evans B, Frost B (1975) Chrome spinel in progressive metamorphism: a preliminary analysis. Geochim Cosmochim Acta 39:379–414CrossRefGoogle Scholar
  45. Farahat ES (2008) Chrome spinels in serpentinites and talc carbonates of the El-Ideid–El Sodmein District, central Eastern Desert, Egypt: their metamorphism and petrogenetic implications. Chem Erde 68(2):195–205CrossRefGoogle Scholar
  46. Farahat ES, El Mahallawi MM, Hoinkes G, Abdel Aal AY (2004) Continental back-arc basin origin of some ophiolites from the Eastern Desert of Egypt. Mineral Petrol 82:81–104CrossRefGoogle Scholar
  47. Farahat ES, Hoinkes G, Mogessie A (2011) Petrogenetic and geotectonic significance of Neoproterozoic suprasubduction mantle as revealed by the Wizer ophiolite complex, Central Eastern Desert, Egypt. Int J Earth Sci 100:1433–1450CrossRefGoogle Scholar
  48. Floyd PA (1991) Oceanic basalts. Blachie and Son Ltd, New YorkGoogle Scholar
  49. Frey FA, Suen JC, Stockman HW (1985) The Ronda high temperature peridotite: geochemistry and petrogenesis. Geochim Cosmochim Acta 49:2469–2491CrossRefGoogle Scholar
  50. Ghoneim MF, Salem IA, Hamdy MM (2003) Origin of magnesite veins in serpentinites from Mount El-Rubshi and Mount El-Maiyit, Eastern Desert, Egypt. Arch Mineral 54:41–63Google Scholar
  51. Godard M, Lagabrielle Y, Alard O, Harvey J (2008) Geochemistry of the highly depleted peridotites drilled at ODP Sites 1272 and 1274 (Fifteen-Twenty Fracture Zone, Mid-Atlantic Ridge): implications for mantle dynamics beneath a slow spreading ridge. Earth Planet Sci Lett 267:410–425CrossRefGoogle Scholar
  52. Gruau G, Bernard-Griffiths J, Lécuyer C (1998) The origin of U-shaped rare earth patterns in ophiolite peridotites: assessing the role of secondary alteration and melt/rock reaction. Geochim Cosmochim Acta 62(21/22):3545–3560CrossRefGoogle Scholar
  53. Guillot S, Hattori KH, de Sigoyer J, Nägler T, Auzende AL (2001) Evidence of hydration of the mantle wedge and its role in the exhumation of eclogites. Earth Planet Sci Lett 193:115–127CrossRefGoogle Scholar
  54. Hamdy MM, Lebda EM (2007) Metamorphism of ultramafic rocks at Gebel Arais and Gebel Malo Grim, Eastern Desert, Egypt: mineralogical and O-H stable isotopic constraints. Egypt J Geol 51:105–124Google Scholar
  55. Hart SR, Zindler A (1986) In search of a bulk-Earth composition. Chem Geol 57:247–267CrossRefGoogle Scholar
  56. Hassanen MA (1985) Petrology and geochemistry of ultramafic rocks in the Eastern Desert, Egypt, with special reference to Fawakhir area. Ph.D. dissertation. Alexandria University, EgyptGoogle Scholar
  57. Hattori KH, Guillot S (2007) Geochemical character of serpentinites associated with high- to ultrahigh-pressure metamorphic rocks in the Alps, Cuba, and the Himalayas: recycling of elements in subduction zones. Geochem Geophys Geosyst. CrossRefGoogle Scholar
  58. Hawkins JW (2003) Geology of supra-subduction zones—implications for the origin of ophiolites. In: Dilek Y, 438 Newcomb S (eds) Ophiolite Concept and the Evolution of Geological Thought. Boulder, CO, Geological 439 Society of America Special Paper 373: 227–268Google Scholar
  59. Hellebrand E, Snow JE, Dick HJB, Hofmann AW (2001) Coupled major and trace elements as indicators of the extent of melting in mid-ocean-ridge peridotites. Nature 410:677–681CrossRefGoogle Scholar
  60. Ishii T, Robinson PT, Maekawa H, Fiske R (1992) Petrological studies of peridotites from diapiric Serpentinite Seamounts in the Izu-Ogasawara-Mariana forearc, leg 125. In: Pearce J, Stokking LB, et al (eds), Proceedings of the Ocean Drilling Project, Leg 125, Scientific Results (College Station), pp 445–485Google Scholar
  61. Jagoutz E, Palme H, Baddenhausen H, Blum K, Cendales M, Dreibus G, Spettel B, Lorenz V, Wanke H (1979) The abundances of major, minor and trace elements in the earth’s mantle as derived from primitive ultramafic nodules. Proc. Lunar Planet. Conf. 10: 2031–2050Google Scholar
  62. Johnson PR, Abdelsalam MG, Stern RJ (2003) The Bi’r Umq-Nakasib suture zone in the Arabian-Nubian Shield: a key to understand crustal growth in the East African Orogen. Gondwana Res 6:523–530CrossRefGoogle Scholar
  63. Kamenetsky VS, Crawford AJ, Meffre S (2001) Factors controlling chemistry of magmatic spinel: an empirical study of associated olivine, Cr-spinel and melt inclusions from primitive rocks. J Petrol 42:655–671CrossRefGoogle Scholar
  64. Khalil KI (2007) Chromite mineralization in ultramafic rocks of the Wadi Ghadir area, Eastern Desert, Egypt: mineralogical, microchemical and genetic study. Neues Jb Mineral Abh 183:283–296Google Scholar
  65. Khalil AES, Azer MK (2007) Supra-subduction affinity in the Neoproterozoic serpentinites in the Eastern Desert, Egypt: evidence from mineral composition. J Afr Earth Sci 49:136–152CrossRefGoogle Scholar
  66. Khedr MZ, Arai S (2013) Origin of Neoproterozoic ophiolitic peridotites in south Eastern Desert, Egypt, constrained from primary mantle mineral chemistry. Mineral Petrol 107(5):807–828CrossRefGoogle Scholar
  67. Khedr MZ, Arai S, Python M, Tamura A (2014) Chemical variations of abyssal peridotites in the central Oman ophiolite: evidence of oceanic mantle heterogeneity. Gondwana Res 25:1242–1262CrossRefGoogle Scholar
  68. Khudeir AA (1995) Chromian spinel-silicate chemistry in peridotite and orthopyroxenite relicts from ophiolitic serpentinites, Eastern Desert, Egypt. Bull Fac Sci Assiut Univ 24:221–261Google Scholar
  69. Khudeir AA, El Haddad MA, Leake BE (1992) Compositional variation in chromite from the Eastern Desert. Mineral Mag 56:567–574CrossRefGoogle Scholar
  70. Kodolányi J, Pettke T, Spandler C, Kamber BS, Gméling K (2012) Geochemistry of ocean floor and fore-arc serpentinites: constraints on the ultramafic input to subduction zones. J Petrol 53:235–270CrossRefGoogle Scholar
  71. Le Bas MJ (1962) The role of aluminum in igneous clinopyroxenes with relation to their parentage. Am J Sci 260:267–288CrossRefGoogle Scholar
  72. McDonough WF, Sun SS (1995) The composition of the Earth. Chem Geol 120:223–253CrossRefGoogle Scholar
  73. Mellini M, Rumori C, Viti C (2005) Hydrothermally reset magmatic spinels in retrograde serpentinites: formation of “ferritchromit” rims and chlorite aureoles. Contrib Miner Petrol 149:266–275CrossRefGoogle Scholar
  74. Mével C (2003) Serpentinization of abyssal peridotites at mid-ocean ridges. C R Geosci 335:825–852CrossRefGoogle Scholar
  75. Mondal SK, Baidya TK, Rao KNG, Glascock MD (2001) PGE and Ag mineralization in a breccia zone of the Precambrian Nuasahi Ultramafic–mafic Complex, Orissa, India. Can Mineral 39:979–996CrossRefGoogle Scholar
  76. Morimoto NFJ, Ferguson AK, Ginzburg IV, Ross M, Seifert FA, Zussmaann I (1988) Nomenclature of pyroxene. Mineral Mag 52:535–550CrossRefGoogle Scholar
  77. Niu Y (2004) Bulk-rock major and trace element compositions of abyssal peridotites: implications for mantle melting melt extraction and post-melting processes beneath mid-ocean ridges. J Petrol 45(12):2423–2458CrossRefGoogle Scholar
  78. Nozaka T (2010) A note on compositional variation of olivine and pyroxene in thermally metamorphosed ultramafic complexes from SW Japan. Okayama Univ Earth Sci Rep 17(1):1–5Google Scholar
  79. O’Hanley DS (1996) Serpentinites, records of tectonic and petrological history. Oxford Monographs on Geology and Geophysics no 34Google Scholar
  80. Obeid MA, Khalil AES, Azer MK (2016) Mineralogy, geochemistry and geotectonic significance of the Neoproterozoic ophiolite of Wadi Arais area, south Eastern Desert, Egypt. Int Geol Rev 58:687–702CrossRefGoogle Scholar
  81. Ohara Y, Stern RJ, Ishii T, Yurimoto H, Yamazaki T (2002) Peridotites from the Mariana Trough: first look at the mantle beneath an active back-arc basin. Contrib Mineral Petrol 143:1–18CrossRefGoogle Scholar
  82. Ozawa K (1994) Melting and melt segregation in the mantle wedge above a subduction zone; evidence from the chromite-bearing peridotites of the Miyamori ophiolite complex, northeastern Japan. J Petrol 35:647–678CrossRefGoogle Scholar
  83. Parkinson IJ, Arculus RJ (1999) The redox state of subduction zone: insights from arc peridotites. Chem Geol 160:409–423CrossRefGoogle Scholar
  84. Parkinson IJ, Pearce JA (1998) Peridotites from the Izu–Bonin–Mariana fore-arc (ODP Leg125): evidence for mantle melting and meltmantle interaction in a supra-subduction zone setting. J Petrol 39:1577–1618CrossRefGoogle Scholar
  85. Paulick H, Bach W, Godard M, De Hoog JCM, Suhr G, Harvey J (2006) Geochemistry of abyssal peridotites (Mid-Atlantic Ridge, 15°20′N, ODP Leg 209): implications for fluid/rock interaction in slow spreading environments. Chem Geol 234:179–210CrossRefGoogle Scholar
  86. Pearce JA, Barker PF, Edwards SJ, Parkinson IJ, Leat PT (2000) Geochemistry and tectonic significance of peridotites from the south sandwich arc-basin system, South Atlantic. Contrib Miner Petrol 139:36–53CrossRefGoogle Scholar
  87. Roeder PL (1994) Chromite from the Fiery rain of Chondrules to the Kilauea iki lava lake. Canad Mineral 32:729–746Google Scholar
  88. Rollinson H, Adetunji J (2015) The geochemistry and oxidation state of podiform chromitites from the mantle section of the Oman ophiolite: a review. Gondwana Res 27:543–554CrossRefGoogle Scholar
  89. Sack RO, Ghiorso MS (1991) Chromian spinels as petrogenetic indicators: thermodynamic and petrological applications. Am Miner 76:827–847Google Scholar
  90. Salters VJM, Stracke A (2004) Composition of the depleted mantle. Geochem Geophys Geosyst. CrossRefGoogle Scholar
  91. Sano S, Kimura JI (2007) Clinopyroxene REE geochemistry of the Red Hills peridotite, New Zealand: interpretation of magmatic processes in the upper mantle and in the Moho transition zone. J Petrol 48:113–139CrossRefGoogle Scholar
  92. Savov IP, Ryan JG, D’Antonio M, Kelley K, Mattie P (2005a) Geochemistry of serpentinized peridotites from the Mariana Forearc Conical Seamount, ODP Leg 125: implications for the elemental recycling at subduction zones. Geochem Geophys Geosyst. CrossRefGoogle Scholar
  93. Savov IP, Guggino S, Ryan JG, Fryer P, Mottl MJ (2005b) Geochemistry of serpentinite muds and metamorphic rocks from the Mariana forearc, ODP Sites 1200 and 778–779, South Chamorro and Conical Seamounts. In: Shinohara M, Salisbury MH, Richter C (eds), Proceedings of the Ocean Drilling Program, Scientific Results 195: 1–49Google Scholar
  94. Shackleton RM (1994) Review of late proterozoic sutures, ophiolitic mélanges and tectonics of eastern Egypt and northeast Sudan. Geol Rundsch 83:537–546CrossRefGoogle Scholar
  95. Shackleton RM, Ries AC, Graham RH, Fitches WR (1980) Late Precambrian ophiolitic mélange in the Eastern Desert of Egypt. Nature 285:472–474CrossRefGoogle Scholar
  96. Sharma M, Wasserburg GJ (1996) The neodymium isotopic compositions and rare earth patterns in highly depleted ultramafic rocks. Geochim Cosmochim Acta 60:4537–4550CrossRefGoogle Scholar
  97. Snow JE, Dick HJB (1995) Pervasive magnesium loss by marine weathering of peridotite. Geochim Cosmochim Acta 59:4219–4235CrossRefGoogle Scholar
  98. Song S, Su L, Niu Y, Lai Y, Zhang L (2009) CH4 inclusions in orogenic harzburgite: evidence for reduced slab fluids and implication for redox melting in mantle wedge. Geochim Cosmochim Acta 73(6):1737–1754CrossRefGoogle Scholar
  99. 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 22:319–351CrossRefGoogle Scholar
  100. Stern RJ (2004) Subduction initiation: spontaneous and induced. Earth Planet Sci Lett 226:275–292CrossRefGoogle Scholar
  101. Stern RJ, Gwinn CJ (1990) Origin of late Precambrian intrusive carbonates, Eastern Desert of Egypt and Sudan: C, O, and Sr isotopic evidence. Precambr Res 46:259–272CrossRefGoogle Scholar
  102. Stern RJ, Johanson PR, Kröner A, Yibas B (2004) Neoproterozoic ophiolites of the Arabian-Nubian Shield. In: Kusky TM (ed), Precambrian ophiolites and related rocks. Developments in Precambrian geology, vol. 13. Elsevier, Amsterdam, pp 95–128CrossRefGoogle Scholar
  103. Suita M, Strieder A (1996) Cr-spinels from Brazilian mafic–ultramafic complexes: metamorphic modifications. Int Geol Rev 38(3):245–267CrossRefGoogle Scholar
  104. Uysal I, Yalçın Ersoy E, Karslı O, Dilek Y, Burhan Sadıklar M, Ottley CJ, Tiepolo M, Meisel T (2012) Coexistence of abyssal and ultra-depleted SSZ type mantle peridotites in a Neo-Tethyan Ophiolite in SW Turkey: constraints from mineral composition, whole-rock geochemistry (major–trace–REE–PGE), Re–Os isotope systematics. Lithos 132–133:50–69CrossRefGoogle Scholar
  105. Yang S-H, Zhou M-F (2009) Geochemistry of the ~ 430‒Ma Jingbulake mafic‒ultramafic intrusion in Western Xinjiang, NM China: implications for subduction related magmatism in the South Tianshan orogenic belt. Lithos 113: 259‒273CrossRefGoogle Scholar
  106. Zimmer M, Kröner A, Jochum KP, Reischmann T, Todt W (1995) The Gabal Gerf complex: a Precambrian 600 N-MORB ophiolite in the Nubian Shield, NE Africa. Chem Geol 123:29–51CrossRefGoogle Scholar

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© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Geology Department, Faculty of ScienceZagazig UniversityZagazigEgypt
  2. 2.Geology Department, Faculty of ScienceMinia UniversityMiniaEgypt

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