Investigations on olivine and spinel mineral chemistry and tectonic setting of peridotites from north west Piranshahr ophiolite, NW Iran

Abstract

According to the olivine and spinel chemistry, two types of peridotite were identified from west north Piranshahr ophiolite. Peridotite rocks are classified based on chemistry of spinel and olivine. Average number of Cr in spinels (Cr#[(100*Cr/(Cr+Al))]) and Mg-number (Mg#[100*Mg/(Mg+Fe)]) in dunite are 0.63 and 0.51 respectively. In harzburgite, Cr# is 0.33 and Mg# is 0.67 and in spinel from serpentinite Cr# is 0.45 and Mg# is 0.55. Also in dunite, Cr/Al is 1.6, in harzburgite Cr/Al is 0.49 and in spinel from serpentinite Cr/Al is 0.81. According to chemistry of spinel and olivine, there are two types of peridotite with different tectonic setting in the Piranshahr ophiolite (which age is upper cretaceous). Discriminant diagrams indicate that dunite is supra-subduction peridotite with a forearc setting, whereas harzburgite and serpentinite are abyssal peridotite. Two different tectonic settings in peridotites of this region are comparable with the Oman ophiolite in Oman-Zagros ophiolitic belt.

Keywords


[1] Michael P., "Diagnostic features and processes in the construction and evolution of Oman- Zagros- Himalayan- Karakoram- and Tibetan-type orogenic belts", Geological Society of America Memoirs 200 (2007), 41-61

[2] Reilinger R., Mcclusky S., Vernant P., Lawrence S., Ergintav S., Cakmak R., Ozener H., Kadirov F., Guilev I., Stepanyan R., HAadariy M., Hahubia G., Mahmoud S., Sakr K., Arrajehi A., Paradissis D., Al-Aydrus A., Prilepin M., Guseva



T., Evren E., Dmitrosta A., Filikov S.V., Gomez F., Al-Ghazzi R., Kaaram G., "GPS constraints on continental deformation in the Africa-Arabia-Eurasia continental collision zone and implications for the dynamics of plate interactions", Journal of Geophysical Research: Solid Earth 26 (2006), 1978-2012.

[3] Shafaii Moghaddam H., Stern R., "Geodynamic evolution of Upper Cretaceous Zagros ophiolites: formation of oceanic lithosphere above a nascent subduction zone", Geological Magazine 148 (2011), 762–801.

[4] Irvine T.N., "Chromian spinel as a petrogenetic indicator; part II, Petrologic applications. Canadian", Journal of Earth Sciences 4 (1967), 71-103.

[5] Dick H.J.B., Bullent., "Chromian spinel as a petrogenetic indicator in abyssal and alpine type peridotites and spatially associated lavas", Contributions to Mineralogy and Petrology 86 (1984), 54-76.

[6] Henry J.B., Dick HJB., Henry TB., "Chromian spinel as a petrogenetic indicator in abyssal and alpine-type peridotites and spatially associated lavas", Contributions to Mineralogy and Petrology 86 (1984), 54-76

[7] Kamenetsky V. S., Crawford A. J., Meffre S., "Factors controlling chemistry of magmatic spinel: An empirical study of associated olivine, Cr-spinel and melt inclusions from primitive rocks", Journal Petrology 42 (2001), 655–671.

[8] Arai S., "Chemistry of chromian spinel in volcanic rocks as a potential guide to magma chemistry", Mineralogical Magazine, 56, (1992), 173–184.

[9] Beccaluva L., Girolamo D., Maciotta G., Morra V., "Magma affinities and fractionation trends in ophiolites", Ofioliti 8 (1983), 307–324.

[10] Arai S., "Characterization of spinel peridotites by olivine-spinel compositional relationships: Review and interpretation", Chemical Geology 113 (1994), 191-204.

[11] Arai S., Kadoshimak K., Morishitat T., "Widespread arc-related melting in the mantle section of the northern Oman ophiolite as inferred from detrital chromian spinels", Journal of Geological Society 163 (2006), 869-79.

[12] خدابنده ع. ا.، "سازمان زمین شناسی و اکتشافات کشور، نقشه زمین شناسی100000/1 نقده"، (1383)

[13] Kretz, "Symbols for rock-forming minerals", American Mineralogist 68 (1983), 277-279.

[14] Kimball K.L., "Hydrothermal alteration of peridotite from the Galicia margin, Iberian Peninsula", Proceedings of the Ocean Drilling Program, Scientific Results 103 (1988), 241-251.

[15] Dilek Y., Furnes H., "Ophiolite genesis and global tectonics: Geochemical and tectonic fingerprinting of ancient oceanic lithosphere", Geological Society of America Bulletin, 123 (2011), 387-411.

[16] Parkinson I.J., Pearce J.A., "Peridotites of the Izu-Bonin-Mariana forearc, Effects of hydrothermal alteration on the compositions of chromian spinel (ODP Leg 125) evidence for mantle melting and melt–mantle interactions in a suprasubduction zone setting", Journal of Petrology 39 (1998), 1577–1618.

[17] Parkinson I.J., Pearce J.A., Thirwall M.F., Johnson K.T.M., Ingram G., "Trace element geochemistry of peridotites from the Izu–Bonin–Mariana forearc", Proceedings of the Ocean Drilling Program, Scientific Results Leg 125 (1992), 487-506.

[18] Pearce J.A., Barker P.F., Edwards S.J., Parkinson I.J., Leat P.T., "Geochemistry and tectonic significance of peridotites from the South Sandwich arc-basin system, South Atlantic", Contributions to Mineralogy and Petrology 139 (2000), 36–53.

[19] Ernewein M., "Histoire magmatique d'un segment de croûte océanique téthysienne: Pétrologie de la séquence plutonique du massif ophiolitique de Salahi (nappe de Semail, Oman)", Thèse d'université, Université Louis Pasteur 205 (1987), 171-188.

[20] Barnes S.J., Roeder P.L., "The range of spinel compositions in terrestrial mafic and ultramafic rocks", Journal of Petrology 42 (2001), 2279–2302.

[21] Stern R.J., Johanson P.R., Kroner A., Yibas B., "Neoproterozoic ophiolites of the Arabian–Nubian Shield. In: Kusky TM (ed) Precambrian ophiolites and related rocks", Developments in Precambrian Geology, Elsevier, Amsterdam 13 (2004), 95-128.

[22] Azer M.K., Stern R.J., "Neoproterozoic (835–720 Ma) serpentinites in the Eastern Desert, Egypt: fragments of forearc mantle", Geology 115 (2007), 457-472.

[23] Hamdy M.M., Harraz H.Z., Aly G.A., "Pan-African (intraplate and subduction-related?) metasomatism in the Fawakhir ophiolitic serpentinites, Central Eastern Desert of Egypt: mineralogical and geochemical evidences", Arabian Journal of Geoscience 36 (2013), 13-33.

[24] Conrad W.K., Kay R.W., "Ultramafic and Mafic Inclusions from Adak Island: Crystallization History, and Implications for the Nature of Primary Magmas and Crustal Evolution in the Aleutian Arc", Journal of Petrology 25 (1984), 88-125.

[25] Bloomer S.H., Hawkins J.W., "Gabbroic and ultramafic rocks from the Mariana trench: an island arc ophiolite. In: Hayes, D.E. (Ed.)", The Tectonics and Geologic Evolution of Southeast Asian Seas and Islands: Part II. AGU Geophysical Monograph, American Geophysical :union:, (1983), 294–317.

[26] Ishii T., Robinson P.T., Maekawa H., Fiske R., "Petrological studies of peridotites from diapiric serpentinite seamounts in The Izu–Ogasawara–Mariana forearc", LEG125. In: Fryer, P., Pearce, J.A., Stokking, L.B. (Eds.), "Proceedings of the Ocean Drilling Program. Scientific Results", vol. 125.Ocean Drilling Program, College Station, Texas, pp. (1992), 445–485.

[27] Le Mée L., Girardeau J., Monnier C., "Mantle segmentation along the Oman ophiolite fossil mid-ocean ridge", Nature 432, (2004), 167–172

[28] Akihiro Tamura, Shoji Arai, "Harzburgite–dunite–orthopyroxenite suite as a record of supra-subduction zone setting for the Oman ophiolite mantle", Lithos 90 (2006), 43–56

[29] Ibrahim Uysal, A. Dündar Şen, E. Yalçın Ersoy, Yildirim Dilek, Samet Saka, Federica Zaccarini, Monica Escayola, Orhan Karslı, "Geochemical make-up of oceanic peridotites from NW Turkey and the multi-stage melting history of the Tethyan upper mantle", Mineralogy and petrology, Original paper (2013), 1-29.

[30] Hirose K., Kawamoto T., "Hydrous partial melting of lherzoliteat 1 GPa: the effect of H2O on the genesis of basaltic magmas", Earth and Planetary Science Letters 133 (1995), 463–473.

[31] Matsukage K., Kubo K., "Chromian spinel during melting experiments of dry peridotite (KLB-1) at 1.0–2.5 GPa", AmericanMineralogist 88 (2003), 1271–1278.

[32] Matsukage K., Arai S., Abe N., Yurimoto H., "Two contrasting melting styles of mantle peridotite in the northern Oman ophiolite: an indication of a switch of their tectonic setting", Research Report of JSPS Grants-in-Aid for Science Research, (2001) 19–32.