GEOCHEMICAL PROPERTIES AND RODINGITIZATION OF DIABASE DYKES CUTTING PERIDOTITES IN YÜKSEKOVA COMPLEX (ÖZALP, VAN - TURKEY)

In this study, the geology of diabase dikes which cut peridotites of Yüksekova Complex (Özalp, Van, Turkey) and the effects of Ca metasomatism that caused the metamorphism of these peridotites were investigated. Within the light of mineralogical and petrographical studies and geochemical data; it was determined that diabase dykes that cut peridotites in Yüksekova Complex had shown rodingitization in various degrees due to Ca metasomatism. Depending on this metasomatism, Ca-Al-Mg rich silicates were formed. The mineralogy of rodingitized dikes with ophitic texture is composed of diopside, plagioclase, hydrogrossularite, chlorite, epidote and in minor amounts phlogopite, prehnite, apatite, calcite, opaque minerals. Metasomatism caused enrichment of Ca and depletion of SiO2in whole rock major oxides of dikes in tholeiitic character. So, dikes were divided into three different subgroups. The first group is formed from high grade rodingitized diabase dikes (~38.0–42.0 wt.% in SiO2; 19.0–26.0 wt. % in CaO). The grade of rodingitization in diabase dikes forming the second group is relatively low (~42.5–43.0 wt. % in SiO; 14.5–15.0 wt. % in CaO). However, the effect of rodingitization has not been encountered due to results of both petrographical and geochemical analyses in diabase dikes which form the third group (~47.0–50.0 wt. % in SiO; 10.0–12.0 wt. % in CaO). It is considered that in rodingitized dykes of which are enriched by trace and REE (Rare Earth Element) contents, the fluids affecting the metasomatic source have developed as a result of interactions with other rocks which were enriched more in these elements. It is also contemplated that the local geology, tectonical structure of the environment and the heat, oxygen fugacity and chemical composition in fluids which would develop due to those factors are significant in this interaction

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  • Austrheim, H. and Prestvik, T., 2008, Rodingi- tization and hydration of the oceanic lithosphere as developed in the Leka ophiolite, north-central Norway. Lithos, 104, 177–198.
  • Bach, W. and Klein, F., 2009, The petrology of seafloor geochemical reaction path modelling. Lithos, 112, 103–117. insights from
  • Barazangi, M., Sandvol, E. and Seber, D., 2006, Structure and tectonic evolution of the Anatolian plateau in eastern Turkey, in Dilek, Y. and Pavlides, S., eds., Post collisional tectonics and magmatism in the Mediterranean region and Asia: GSA Spesial Paper, 409, 463-474.
  • Barth, M.G., Mason, P.R.D., Davies, G.R., Dijkstra, A.H. and Drury, M.R., 2003, Geochemistry of the Othris ophiolite, Greece: evidence for refertilization?, Journal of Petrology, 44, 1759–1785.
  • Bassaget, J.P., Michel, R. and Richard, F., 1967, Les rodingites et les ophisherites du massif ultrabasique de la province de Muğla (Taurus occidental, Turquie). Com- paraison avee les analyses ehimiques re”eentes de rodingites des Alpes. Trav, Lab. Geol. Grenoble, 43, 23-39.
  • Bozkurt, E., 2001, Neotectonics of Turkey – a synthesis. Geodinamica Acta, 14, 3–30.
  • Bizimis, M., Salters, V.J.M. and Bonatti, E., 2000, Trace and REE content of clinopyroxenes from supra-subduction zone peridotites, Implications for melting and enrichment processes in island arcs, Chemical Geology, 165, 67–85.
  • Cawood A.P., Kröner A., Collins J.W., Kusy M.T., Mooney D.W. and Windley F.B., 2009, Accretionary orogens through Earth history, Geological Society, London, Special Publications 2009; v. 318; 1-36.
  • Cann, J.R., 1970, Rb, Sr, Y, Zr and Nb in some ocean floor basaltic rocks, Earth and Planetary Science Letters, 10, 7–11.
  • Coish, R.A., 1977, Ocean floor metamorphism in the Betts Cove Ophiolite, Newfoundland, Contributions to Mineralogy and Petrology, 60, 277–302.
  • Coleman, R.G., 1967, Low-temperature reaction zones and alpine ultramafic rocks of California, Oregon, and Washington, U.S. Geological Survey Bulletin, 1247, 1–49.
  • ————,1977, Ophiolites, Springer-Verlag, Berlin (1977), 229.
  • Çakır, Ü., 2009, Structural and geochronological relationships of metamorphic soles of eastern Mediterrranean ophiolites to surrounding units: Indicators of intra- oceanic subduction and emplacement, International Geology Review, Vol. 51, pp.189-215.
  • Çoğulu, E. and Vuagnat, M., 1965, Sur l’existence de rogingites dans les serpentinites des environs de Mihaliççik, (Vilayet d’Eskişehir, Turquie), Bull, suisse Mineral, P6tr, 45, 17-20.
  • Dilek, Y., Furnes, H. and Shallo, M., 2008, Geochemistry of the Jurassic Mirdita Ophiolite (Albania) and the MORB to SSZ evolution of a marginal basin oceanic crust, Lithos100, 174–209.
  • ———— and ————, 2009, Structure and geochemistry of Tethyan ophiolites and their petrogenesis in subduction rollback systems, Lithos, 113 (2009), 1–20.
  • Dubinska E, 1995, Rodingites of the eastern part of massif, Lower Silesia, Poland, Canadian Mineralogist, 1995, 33: .3585-3608.
  • ————, 1997, Rodingites and amphibolites from the serpentinites surrounding Göry Sowie block (Lower Silesia, Poland): record of supra-subduction zone magma- tism and serpentinization, Neues Jahrbuch für Mineralogie Abhandlungen, 171, 239– 279.
  • Elitok, Ö. and Dolmaz, M.N., 2008, Mantle flow- induced crustal thinning in the area between the easternmost part of the Anatolian plate and the Arabian Foreland (E. Turkey) deduced from the geological and geophysical data, Gondwana Research, 13, 3, 302-318.
  • Elthon, D., 1979, High magnesia liquids as the parental magma for ocean floor basalts: Nature, v. 278, 514-518.
  • Frost, R.B. and Beard, A.S., 2007, On silica activity and serpentinization, Journal of Petrology, 48, 1351–1368.
  • Floyd, P.A. and Winchester, J.A., 1975, Magma type and tectonic setting discrimination using inactive elements, Earth and Planetary Science, Letters, 27, 211–18.
  • Göncüoğlu, M.C., Dirik, K. and Kozlu, H., 1997, Pre-Alpine and Alpine Terranes in Turkey: explanatory notes to the terrane map of Turkey, Annales Geologique de Pays Hellenique, 37, 515–536.
  • Grant, J. A., 1986, The Isocon diagram a simple solution to Gresens’ equation for metasomatic alteration, Economic Geology, 81, 1976– 1982.
  • Hopf, S., 1993, Behaviour of rare earth elements in geothermal systems of New Zealand, Journal of Geochemical Exploration, 47,
  • Humphris S.E. 1984, The mobility of the rare earth elements in the crust. In: Henderson P. (ed.), Rare earth element geochemistry, Elsevier, Amsterdam, 315-341.
  • —————, and Thompson G., 1978, Hydro- thermal alteration of oceanic basalts by sea water, Geochim., Cosmochrn.Acte, 42, 107-125.
  • Keskin, M., 2005, Domal uplift and volcanism in a collision zone without a mantle plume: Evidence from Eastern Anatolia, URL: http://www.mantleplumes.org/Anatolia.html
  • Koçyiğit, A., Yılmaz, A., Adamia, S. and Kuloshvili, S., 2001, Neotectonics of East Anatolian Plateau (Turkey) and Lesser Caucasus: implication for transition from thrusting Geodinamica Acta, 14 (2001), 177–195. faulting,
  • Koutsovitis P., Magganas A. and Pomonis P., 2008, Rodingites within scattered ophiolitic occurrences from the northern and eastern Othrys area, Greece, RMS DPI 2008-1-52-1 http://www.minsoc.ru/2008- 1-52-1.
  • Li, X.P., Rahn, M. and Bucher, K., 2008, Eclogite facies metarodingites - phase relations in the system, SiO2–Al2O3–Fe2O3–FeO– MgO–CaO–CO2–H2O: an example from the Zermatt–Saas ophiolite, Journal of Metamorphic Geology, 26, 347–364.
  • Michard A., 1989, Rare earth element syste- matics in hydrothermal fluids. Geochim., Cosmochim., Acta, 53, 745-750.
  • Normand, C. and Williams-Jones, A.E., 2007, Physicochemical conditions and timing of rodingite formation: evidence from rodingite hosted fluid inclusions in the JM Asbestos mine, Asbestos. Québec. Geochemical Transactions, 8, 11p.
  • Okay, I.A. and Tüysüz, O., 1999, Tethyan sutures of northern Turkey. Geological Society, London, Special Publication, v. 156; 475-515.
  • Palandri, J.L. and Reed, M.H., 2004, Geoche- mical models of metasomatism in ultra- mafic systems: Serpentinization, rodin- gitization and seafloor carbonate chimney precipitation, Geochimica et Cosmochi- mica Acta 68, 1115-1133.
  • Pearce, J.A., 1975, Basalt geochemistry used to investigate past tectonic environments on Cyprus, Tectonophysics, 25, 41-67.
  • ————,1982, Trace element characteristics from destructive plate boundaries. In: R.S. Thorpe (Ed.), Andesites: Orogenic andesites and related rocks. John Wiley, Chichester, 525-548.
  • ————, 1983, The role of sub-continental lithosphere in magma genesis at destructive plate margins, In: C.J. Hawkesworth, and M.J. Norry (eds), Continental Basalts and Mantle Xenoliths, pp. 230-249.
  • ———— and Cann, J.R., 1973, Tectonic setting of basic volcanic rocks determined using trace element analyses: Earth and Planetary Science Letters, v. 19, 290– 300.
  • Pearce, J.A. and Norry, M.J., 1979, Petrogenetic implications of Ti, Zr, Y and Nb variations in volcanic rocks, Contributions to Mineralogy and Petrology, 69, 33–47.
  • ————, Alabaster, T., Shelton, A.W. and Searle, M.P., 1981, The Oman ophiolite as a Cretaceous arc-basin complex: evidence and implications, Phil. Trans. R. Soc., Lond. A 300, 299-317.
  • ———— and Stern, R.J., 2006, Back-Arc Spreading Systems: Geological, Biological, Chemical, and Physical Interactions Geophysical Monograph Series, 166, Published in 2006 by the American Geophysical Union,10.1029 /166GM06.
  • Pişkin Ö., 1975, Çelikhan Çevresi Ultrabazikleri içindeki Rodenjitler ve Kimyasal Analizleri, Türkiye Jeoloji Bülteni, 17-21.
  • Puga, E., Nieto, J.M., Diaz de Federico, A., Bodinier, J.L. and Morten, L., 1999, Petrology and metamorphic evolution of ultramafic rocks and dolerite dykes of the Betic ophiolitic association (Mulhacen Complex, SE Spain): evidence of Neo- Alpine subduction following an ocean- floor metasomatic process, Lithos 49, pp.23-56.
  • Putnis A., and Austrheim H., 2010, Fluid-induced processes: metasomatism ano metamorphism, Geofluids 10, 254-269.
  • Robertson, A.H.F. and Dixon, J.E., 1984, Introduction: aspects of the geological evolution of the Eastern Mediterranean. In: Dixon, J.E., Robertson, A.H.F. (Eds.), The Geological Evolution of the Eastern Mediterranean. Geological Society, London, Special Publication, 17, 1–74.
  • Saunders, R.S., Roth, L.E., Downs, G.S. and Schubert, G., 1980, Early volcanic– tectonic province: Coprates region of Mars, In: Reports of Planetary Geology Program, NASA Tech. Memo., 81,776, 74–75.
  • Shervais, J.W., 2001, Birth, death, and resurrection: The life cycle of supra subduction zone ophiolites: Geoche- mistry, Geophysics, Geosystems, v. 2, paper number 2000GC000080.
  • Spear, F.S., 1981, An experimental study of hornblende stability and compositional variability in amphibolite, American Journal of Science, 281, 697–734.
  • Staudigel, H.T., Plank, W., White, W. and H.U. Schmincke, 1996, Geochemical fluxes during seafloor alteration of the basaltic upper oceanic crust: DSDP Sites in Subduction Top to Bottom. G.E. Bebout, D.W. Scholl, S.H. Kirby, and J.P. Platt, eds, American Geophysical Union Monograph Series 96, Washington, DC 417–418 (Overview). 19–38.
  • Sun, S.S. and McDonough, W.F., 1989, Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders, A.D., Norry, M.J. (Eds.), Magmatism in Ocean Basins, Geological Society of London Special Publications, vol. 42,
  • Şenel, M., 2002, 1/500.000 Türkiye Jeoloji Haritası Van Paftası, Maden Tetkik Arama Genel Müdürlüğü, Ankara, Turkey.
  • Şengör, A.M.C. and Yılmaz, Y., 1981, Tethyan Evolution of Turkey: a plate tectonic approach: Tectonophysics, 75, 181-241.
  • ————, Özeren, S., Zor, E. and Genç, T., 2003, Doğu Anadolu Litosfer Mekaniğine Yeni Bir Yaklaşım, İTÜ Avrasya Yerbilimleri Enstitüsü, Kuvaterner Çalıştayı IV, 101- 110.
  • ————, Özeren, M.S., Keskin, M., Sakınç, M., Özbakır, A.D. and Kayan, İ., 2008, Eastern Turkish high plateau as a small Turkic- type orogen: Implications for post- collisional crust-forming processes in Turkic-type orogens, Earth-Science Reviews, 90, 1–48.
  • Tsikouras, B., Karipi, S., Rigopoulos, I., Perraki, M., Pomonis, P. and Hatzipanagiotou, K., 2009, Geochemical processes and petrogenetic evolution of rodingite dykes in the ophiolite complex of Othrys (Central Greece): Lithos, 113, 540–554.
  • Tüysüz, N. and Erler, A., 1993, Geochemistry and Evolution of Listwaenites in the Kağızman Region (Kars, NE-Turkey): Chem., Erde 53, 319p.
  • Uçurum, A., Koptagel, O. and Lechler, P.J., 2006, Main-Component Geochemistry and Platinum-Group-Element Potential of Turkish Chromite Deposits, with Emphasis on the Muğla Area: International Geology Review, v. 48, 241–254.
  • Ustaömer, T. and Robertson, A.H.F., 1997, Tectonic-sedimentary evolution of the north Tethyan margin in the Central Pontides of northern Turkey. In: Robinson, A.G. (Ed.), Regional and Petroleum geology of the Black Sea and Surrounding Region. Memoir-American Association of Petroleum Geologists, vol. 68, 255–290.
  • Yilmaz, Y., 1993, New evidence and model on the evolution of the Southeast Anatolia Orogen, Geologial Society of America Bulleting 105, 251– 271.
  • Winchester J.A. and Floyd, P.A., 1976, Geochemical magma type discrimination; application to altered and metamorphosed basic igneous rocks. Earth and Planetary, Science Letters, 28, 459-469.
  • ———— and ————,1977, Geochemical discrimination of different magma series and their differentiation products using inactive elements: Chemical Geology, v. 20, 325-343.
  • Wood, D.A., 1980, The application of a Th-Hf-Ta diagram to problems of tectonomagnetic classification and to establish the nature of crustal contamination of basaltic lavas of the British Tertiary volcanic provence. Earth and Planetary Science Letters, 50, 11-30.