Petrogenesis of the Garmab area serpentinites from Ophiolite-Radiolithic zone of Kermanshah (west Iran) using chemistry of minerals and phase diagrams

Authors

1 Department of Geology, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Geology, Faculty of Science, University of Zanjan, Zanjan, Iran

3 Department of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran

Abstract

The Garmab area is located in NW of Kamyaran and belongs to the Kermanshah Ophiolite Zone. This complex is located between the Sanandaj-Sirjan and the Zagros thrust zones. Peridotite rocks in the complex were replaced by serpentinite completely or partly due to hydrothermal alteration. Petrographic studies show that the serpentines formed by hydration of both olivine and orthopyroxene minerals. Electron microprobe and X-ray diffraction (XRD) analyses of the samples indicate that the Garmab serpentinites contain all the three serpentine polymorphs (chrysotile, lizardite, antigorite). Those serpentines replacing olivines have higher SiO2 and lower Al2O3, Cr2O3 and TiO2 than those replacing orthopyroxene. This clearly demonstrates their different sources. The calculated phase diagram for the studied samples shows that serpentinites probably formed in two metamorphism events; the first one includes alteration and hydration of harzburgite in T< 200 oC and P < 4 kbar, while the second one occurred due to increasing T and P to more than 400 oC and 4 kbar.

Keywords


Agard, P., Omrani, J., Jolivet, L. Mouthereau, F., 2005. Convergence history across Zagros (Iran): constraints from collisional and earlier deformation. International Journal of Earth Science 94(3), 401- 419.
Allahyari, K., Saccani, E., Pourmoafi, M., Beccaluva, L. Masoudi, F., 2010. Petrology of mantle peridotites and intrusive mafic rocks from the Kermanshah ophiolitic complex (Zagros belt, Iran): implications for the geodynamic evolution of the Neo-Tethyan oceanic branch between Arabia and Iran. Ofioliti 35, 71-90.
Allahyari, K., Saccani, E., Rahimzadeh, B. Zeda, O., 2014. Mineral chemistry and petrology of highly magnesian ultramafic cumulates from the Sarve-Abad (Sawlava) ophiolites (Kurdistan, NW Iran): new evidence for boninitic magmatism in intra-oceanic fore-arc setting in the Neo-Tethys between Arabia and Iran. Journal of Asian Earth Sciences 79, 312–328.
Andreani, M., Boullier, A.M. Gratier, J.P., 2005. Development of schistosity by dissolution crystallization in a Californian serpentinite gouge. Journal of Structural Geology 27, 2256–2267.
Aswad, K. J., Aziz, N. R. and Koyi H. A., 2011. Cr-spinel compositions in serpentinites and their implications for the petrotectonic history of the Zagros suture zone, Kurdistan region, Iraq. Geological Magazine 148, 802- 818.
Azer M.K., Khalil A.E.S., 2005. Petrological and mineralogical studies of Pan-African serpentinites at Bir Al-Edeid area, Cenatral Eastern Desert, Egypt. Journal of African Earth Sciences, 43(5): 525–536.
Bach, W., Banerjee, N.R., Dick, H.J. Baker, E.T., 2002. Discovery of ancient and active hydrothermal systems along the ultra‚Äźslow spreading Southwest Indian Ridge 10°–16°E. Geochemistry, Geophysics, Geosystems 3, 1-14.
Baumgartner, P., 2013.Mesozoic radiolarites–accumulation as a function of sea surface fertility on Tethyan margins and in ocean basins. Sedimentology 60, 292-318.
Bellot, J.P., 2008. Natural deformation related to serpentinisation of an ultramafic inclusion within a continental shear zone: The key role of fluids. Tectonophysics 40, 133-144.
Berberian, M. King, G.C.P., 1981. Towards a paleogeography and tectonic evolution of Iran. Canadian Journal of Earth Sciences 18, 210-265.
Braud, J. Bellon, H., 1974. Donnes nouvelles sur le domaine metamorphique du Zagros (zone de Sanandaj-Sirjan) au niveau de Kermanshah- Hamadan; nature, age et interpretation des series métamorphiques et des intrusions évolution structural. Faculté des Sciences d'Orsay, Université Paris, France.
Braud, J., 1987. La suture du Zagros au niveau de Kermanshah (Kurdistan Iranian): reconstitution paléogéographique, Évolution Géodynamique, Magmatique et Structurale. Thèse Doctorat d'État, Paris, Géodiffusion Mémoire 5.
Bromiley, G.D. Pawley, A.R., 2003.The stability of antigorite in the system MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH) the effects of Al3‏ substitution on high-pressure stability. American Mineralogist 88, 99-108.
Bucher, K., Grape, R., 2011. Petrogenesis of metamorphic rocks, 8st edition, Springer Berlin, Heidelberg, 441 p.
De Capitani, C.K., 2010. Petrakakis the computation of equilibrium assemblage diagrams with Theriak/Domino software. American Mineralogist 95, 1006-1016.
Delaloye, M. Desmons, J., 1980. Ophiolites and melange terranes in Iran: a geochronological study and its paleotectonic implications. Tectonophysics 68, 83-111.
Deschamps, F., Guillot, S., Godard, M., Chauvel, C., Andréani, 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. Chemical Geology 69, 262-277.
Dilek Y., Furnes H., 2011. Ophiolite genesis and global tectonics: geochemical and tectonic fingerprinting of ancient oceanic lithosphere", Geological Society of America Bulletin 123: 387-411.
Dungan, M.A. 1979. A microprobe study of antigorite and some serpentine pseudomorphs. The Canadian Mineralogist, 17, 771-784.
Evans, B. W. 2004. The Serpentinite Multisystem Revisited: Chrysotile Is Metastable, International Geology Review 4, 479-506.
Evans, C. Hawkins, J., 1979. Mariana-arc trench system: Petrology of "seamounts" on the trench-slope break. Eos Transactions American Geophysical Union 60, 968 (Abstract).
Fabien, H. 2005. Les ophiolites de Kermanshah (Iran): Naissance dun arc intra-oceanique Eocene en fin de subduction de la Neotethys. Memori de stage de Recherche Master.
Falah, S., Ahamadi Khalaji., A., Veisinia, A., Tahmasbi, Z., Rahimzadeh, B., 2020. The study of mineral chemistry of the harzburgite in the Noorabad-Harsin ophiolite complex: An evidence from the evolution of partial melting of mantle peridotite from the deep ocean to the subduction zone. Petrology 41, 1-28.
Floyd, P.A., Yaliniz, M.K., Goncuoglu, M.C., 1998. Geochemistry and petrogenesis of intrusive and extrusive ophiolitic plagiogranites, Central Anatolian Crystalline Complex, Turkey. Lithos 42, 225-4.
Fryer, P., Ambos, E, L., Hussong, D.M., 1985. Origin and emplacement of Mariana forearc seamounts. Geology 13, 774-777.
Fyfe, W.S., Lonsdale, P., 1981. Ocean floor hydrothermal activity. In: C. Emiliani (Ed), The Sea. Wiley, New York, pp. 589-638.
Garfunkel, Z. 2006. Neotethyan ophiolites: formation and obduction within the life cycle of the host basins. In:  Robertson A.H.F., (Ed.), Tectonic Development of the Eastern Mediterranean Region. Geological Society of London Special Publication, London, pp. 301–26.
Gharib, F., De Wever, P., 2010. Radiolaires mésozoïques de la formation de Kermanshah (Iran). Comptes Rendus Palevo l9, 209-219.
Ghazi, A. M. Hassanipak, A.A., 1999. Geochemistry of sub-alkaline and alkaline extrusives from the Kermanshah ophiolite, Zagros Suture Zone, Western Iran: implications for Tethyan plate tectonics. Journal of Asian Earth Sciences 17, 319- 332.
Guillot S, Schwartz S, Reynard B, Agard P, Prigent C., 2015. Tectonic significance of serpentinites. Tectonophysics, 646: 1-19.
Hajialioghli, R., Moazzen, M., Droop, G.T.R., Oberhänsli, R., Bousquet, R., 2007. Serpentine polymorphs and P-T evolution of metaperidotites and serpentinites in the Takab area, NW Iran. Mineralogical Magazine 71, 203–222.
Haldar, S.K., Tišljar, J. 2014.Introduction to Mineralogy and Petrology, Elsevier, 354 p.
Hattori, K., Guillot, S., 2003. Volcanic fronts form as a consequence of serpentinite dehydration in the forearc mantle wedge. Geology 31, 525–528.
Hattori, K., 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. Geochemistry, Geophysics, Geosystems 9, 1-27.
Hyndman, R, D., Peacock, S., M. 2003. Serpentinization of the forearc mantle. Earth and Planetary Science Letters 212, 417-432.
Leterrier, J., 1985. Mineralogical, geochemical and isotopic evolution of two Miocene mafic intrusions from the Zagros (Iran). Lithos 18, 311–329.
Li, X.P., Rahn, M., Bucher, K., 2004. Serpentinites of the Zermatt–Saas ophiolite complex and their texture evolution. Journal of Metamorphic Geology, 22, 159-177.
Nadimi, A., 2002. Mantle flow patterns at the Neyriz Paleo-spreading center, Iran. Earth and Planetary Science Letters 203, 93- 104.
Palandri, J.L. Reed, M.H., 2004. Geochemical models of metasomatism in ultramafic systems: Serpentinization rodingitization and sea floor carbonate chimney precipitation. Geochimica et Cosmochimica Acta 68, 1115-1133.
Pearce, J.A., Robinson, P.T., 2010. The Troodos ophiolitic complex probably formed in a subduction initiation, slab edge setting. Gondwana Research 18, 60-81.
Prichard, H M., 1979. A petrographic study of the process of serpentinization in ophiolites and the Ocean crust. Contributions to Mineralogy and Petrology 68, 231-241.
Rafia, R., Shahidi, A., 1999. Geological Map of Mianrahan, scale: 1:100000. Geological survey and Mineral Exploration of Iran, Tehran, Iran.
Sabzehei M., 1998. Upper Proterozoic-Lower Paleozoic ultramafic-mafic association of southeast Iran, Product of an ophiolitic magma of komatiitic affinity. International Ophiolite Symposium Finland.
Saccani, E., Allahyari, K., Rahimzadeh, B., 2014. Petrology and geochemistry of mafic magmatic rocks from the Sarve-Abad ophiolites (Kurdistan region, Iran): evidence for interaction between MORB-type asthenosphere and OIB-type components in the southern Neo-Tethys Ocean. Tectonophysics 621, 132–147.
Scambelluri, M., Müntener, O., Ottolini, L., Pettke, T.T., Vannucci, R., 2004. The fate of B, Cl and Li in the subducted oceanic mantle and in the antigorite breakdown fluids. Earth and Planetary Science Letters 222: 217-234.
Schwartz, S., Guillot, S., Reynard, B., Lafay, R., Nicollet, C., Debret, B., Auzende, A.L., 2013. Pressure–temperature estimates of the lizardite/antigorite transition in high pressure serpentinites. Lithos, 178, 197-210.
Shafaii Moghadam, H. and Stern, S., 2011. Geodynamic evolution of Upper Cretaceous Zagros ophiolites, formation of oceanic lithosphere above a nascent subduction zone. Geological Magazine 148, 762–801.
Shahidi, M., Nazari, H., 1997. Geological map of Harsin, 1:100.000 scale. Geological survey and Mineral Exploration of Iran, Tehran, Iran.
Valinasab Zarnagh, F., Hajialioghli, R., Moazzen, M., 2014. Serpentinization of the Piranshahr peridotites: investigations on serpentine polymorphs and metamorphic evolutions of the metaperidotites. Petrology 20, 71-90 (in Persian with English abstract).
Veisinia, A. 2017. Petrology, geochemistry and tectonic setting of the Garmab peridotite complex, Kermanshah ophiolite, northeast Kamyaran. MSc thesis, University of Zanjan, Zanjan, Iran (in Persian with English abstract).
Veisinia, A., Ebrahimi, M., Mokhtari, M.A., Ahmadian, J., Azimzadeh, A.M., 2018. Mineral chemistry and tectonic setting of mantle peridotites of the Garmab ophiolitic sequence, NE Kamyaran. Kharazmi Journal of Earth Sciences 3, 241-266.
Vils, F., Müntener, O., Kalt, A., Ludwig, T., 2011. Implications of the serpentine phase transition on the behavior of beryllium and lithium–boron of subducted ultramafic rocks. Geochimica et Cosmochimica Acta 75, 1249–1271.
Viti, C., Mellini, M., 1998. Mesh textures and bastites in the Elba retrograde serpentinites. European Journal of Mineralogy 10, 1341-1359.
Whitechurch, H., Omrani, J., Agard, P., Humbert, F., Montigny, R. and Jolivet, L., 2013. Evidence for Paleocene–Eocene evolution of the foot of the Eurasian margin (Kermanshah ophiolite, SW Iran) from back–arc to arc: implications for regional geodynamics and obduction. Lithos 182-183, 11–32.
Whitney, D.L. Evans, B.W., 2010. Abbreviations for names of rock-forming minerals. American Mineralogist 95, 185–187.
Wicks, F.J., Plant A.G., 1979. Electron-microprobe and X-ray microbeam studies of serpentinite textures. Canadian Mineralogists 17, 785-830.
Zarei Sahamieh, R., Moradpour, A., Geochemistry and petrology of Harsin–Sahneh ophiolitic complex (NE of Kermanshah—west of Iran) an evidence of Southern Neo-Tethys Ocean tectonic. Aeabian Journal of Geoscience 8, 8347-8360.