ORIGIN OF MAGNESITE OCCURENCES IN SÜLEYMANÝYE, MÝHALLIÇIK, ESKÝÞEHÝR, TÜRKÝYE

Year 2008, Volume: 136 Issue: 136, 16 - 17, 01.05.2008

Asuman Yılmaz Mustafa Kuşcu

Abstract

In this study, the approaches on the origin of magnesite occurences which are developed related to altered ultramafic
rocks in the peridotites of Tavþanlý Zone have been implemented with isotopic data in addition to geological
and mineralogical data. Cryptocrystalline textured magnesites display two different type of formation as both
individual veins at the fractures and cracks of ultramafic rocks and stockworks. In order to determine carbon
source in magnesite composition and formation of magnesite, C13 and O18 isotope studies have been done.
C13 (PDB) values in magnesite vary between -2.71 and -7.69 ‰. On the other hand, O18 (SMOW) values vary
between 27.35 and 29.43 ‰. These isotopic data indicate that magnesites are formed as mixing of both CO2 from
atmospheric origin of carbon for magnesite occurrences is the result of mixing CO2 from atmospheric origin and
CO2 released during decarbonization of organic rich sediments. Volcanogenic CO2 are also effective in the formation.The
mineralization of Süleymaniye magnesites probably occured after serpentinization of ultramafic rocks
under near surface and low temperature conditions. 

Keywords

Magnesite, isotope, Süleymaniye, Turkey

References

• Abu-Jaber, N.S. ve Kimberley, M.M., 1992. Origin of ultramafic-hosted magnesite on Margarita Island, Venezuella. Mineralium Deposita 27, 234-241.
• Barnes, L., ve O'Neil, J.R., 1996. The Relationship between fluids in some fresh Alpine-type ultra- mafics and possible modern serpentinization, Western United States. Geological Society of America Bulletin, 80, 1947-1960.
• Bau, M. ve Möller, P. 1992. Rare earth element frac- tionation in metamorphogenetic hydrothermal calcite, magnesite and siderite. Mineralogy Petrology, 45, 231-246
• Brydie, J.R., Fallick, A.E., Ilich, M., Maliotis, G. ve Russell, M. J., 1993. A stable isotopic study of magnesite deposits in the akamas area, N.W. Cyprus: Institution Of Mining And Metallurgy Transactions, V. 102, Sec.B, P. B50-B53.
• Bodenlos, A.J., 1950, Geology of the Red Mountain magnesite district, Santa Clara and Stanislaus Counties, California: California Jour. Mines and Geology, 46, 223-278.
• Cengiz, O. ve Kuşcu, M., 2003. Madenli (Gelendost- Isparta) manyezit cevherleşmesinin jeoloji ve jeokimyasal özellikleri: Geosound Yerbilimleri Dergisi, 43, 45-61.
• Curtis, C.D., 1978. Possible links between sandstone diagenesis and depth related geochemical reactions occurring in enclosing mudstone. Journal of Geological Society of London, 135, 107-117.
• Collins, A.S., ve Robertson, A.H.F., 1998. Processes of Late Cretaceous to Late Miocene episodic thrust-sheet translation in the Lycian Taurides, SW Turkey. Journal of Geological Society of London, 155, 759-712.
• Dabitzias, S. 1980 Petrology and genesis of the Vavdos cryptocrystalline magnesite deposits, Chalkidiki peninsula, northern Greece. Econo- mic Geology 75, 1138-1151.
• Emergy, D., ve Robinson, A., 1993. Inorganic geo- chemistry: Applications to petroleum geology. London, Blackwell, 254 p.
• Fallick, A.E., Ilich, M. ve Russell, M.J., 1991. A Stable isotope study of the magnesite deposits asso- ciated with the Alpine-type ultramafic rocks of Yugoslavia. Economic Geology, 86, 847- 861.
• Field., C.W., ve Fifarek, R.H., 1985. Light stable-iso- tope systematics in the epithermal environ- ment. Society of Economic Geologists Reviews in Geology, 2, 99-128.
• Göncüoðlu M.C., Yalınız, M.K. ve Tekin, U.K., 2006. Geochemistry, Tectono - magmatic discrimina- tion and radiolarian ages of basic extrusives within the Izmir-Ankara Suture Belt (NW Tur- key): Time constraints for the Neotethyan evo- lution, Ofioliti, 31 (1), 25-38.
• Gözler, Z., Cevher,F., Erdem, E. ve Asutay H.J, 1996. Orta Sakarya ve güneyinin Jeolojisi. MTA Genel Müdürlüðü, Rapor No: 9973, Ankara (ya- yımlanmamış).
• Ilich, M., 1968. Problems of the genesis and genetic classification of magnesite deposits. Geologica Carpatica. 19. 149 -160.
• Jedrysek, M.O., ve Halas, S., 1990. The origin of mag- nesite deposits from the Polish Foresudetic Block ophiolites; Preliminary 13C and 18O investigations. Terra Nova, 2, 154-156.
• Kralik, M., Aharon, P., Scroll, E., ve Zachmnn, D., 1989, Carbon and Oxygen isotope systematics of magnesites. In: Miller, P., (ed), A review on the formation of magnesite. Berlin, Geobrüder Borntrager, 28, 197-223.
• Möller. P, 1989. Minor and trace elements in magne- site Monograph Series On Mineral Deposits 28. 173-195. Gebrüder Borntrager. Berlin-Stutgart.
• O' Neil, J.R. ve Barnes, I., 1971. C13 and O18 compo- sition in some fresh-water carbonate associa- ted with ultramafic rocks. Western United States: Geochimica Cosmochimica Acta, 35, 687-697.
• Okay, A.I., 1984. Kuzeybatı Anadoluda yer alan meta- morfik kuşaklar. Ketin Sempozyumu, Türkiye Jeoloji Kurumu Yay. 83-92.
• Pohl, W., 1990. Genesis of magnesite deposits-mo- dels and trends. Geologiche Rundschau 79; 291- 99.
• Rao, B.K., Sethumadhv, M.S., Prasad, M.H., Mahaba- leshwar, T.D. ve Rao, A.V., 1999. Features and Genesis of vein-type magnesite deposits in the Doddakanya area of Karnataka, India. Journal of the Geological Society of India, 54/5, 449- 465.
• Salomons, W., ve Mook, W.G., 1986. Isotopic geo- chemistry of carbonates in the weathering zone. In: Fritz, P., and Fontes, J.C. (eds), Handbook of environmental isotope geoche- mistry: New York, Elsevier, p.239-270.
• Scroll. E., 2002. Genesis of magnesite deposits in the view of isotope geochemistry. Boletim Para- naense de Geociencias, 50, 59-68.
• Wenner, D.B., ve Taylor, H.P.,1974. D/H and O18/O16 studies of serpentinization of ultramafic rocks. Geochimica, Cosmochimica Acta, 38;1255- 1286.
• Yılmaz, A. ve Kuşcu, M., 2007. Süleymaniye (Mihalıcçık-Eşkişehir) bölgesindeki manyezitle- rin Jeolojisi ve Jeokimyasal özellikleri. Türkiye Jeoloji Bülteni, 50/2, 95-107.
• Zachmann, D.W. ve Johannes, W., 1989. Crypto- crystalline magnesite: In: Möller,P., (ed), A re- view, on the formation of magnesite: Berlin, Gebruder Borntraeer, 28, 15-28.
• Zedef, V., Russell, M.J. ve Fallick, A. E., 2000. Genesis of vein stockwork and sedimentary Magnesite and hydromagnesite deposits in the ultramafic Terranes of Southwestern Turkey: A stable Isotope Study. Economic Geology, 95,429-446