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    Chemical and physical properties of the Kizildag olivines. A giant olivine deposit, Antalya, SW Turkey
    (OFIOLITI, 2004) Zedef, Veysel; Doyen, A.; Öncel, M. S.; Söğüt, A. R.; Köseleli, T; Koçak, K.
    The Kizildag olivine deposit is found within the Kizildag ultramafics. The main source of the olivine are the dunites, which are located in the ultramafics. The chemical and mineralogical composition and the physical properties of the studied samples are relatively uniform. The main component of the dunites is forsteritic olivine (Mg2SiO4), which consists of 48.75% MgO, 42.31% silica and 7.21% Fe2O3, The average expansion rate and ignition loss is 1.18% and 0.96% respectively. These percentages satisfy the requirements of the iron and steel industry, as well as meeting acceptable refractory standards. The reserve of the Kizildag olivine deposits is estimated to be 9 billion (9,000,000,000) tons, which is comparable to the largest known olivine deposits of Aheim (Norway). The olivine of Kizildag can be exported to international markets, for the port of Antalya is situated 120 km from the deposits. The main disadvantage is the failure of the domestic market to recognize the olivine as a valuable resource.
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    The economic importance of the Kizilda? ultramafic rocks, Kizildag, Akseki, SW Turkey
    (2006) Doyen, A.; Zedef, Veysel
    The ultramafic rocks around Kizildag have very important economic reserves of chromite and olivine. The ultramafic rocks are mainly composed of dunites and in lesser amount diabases. The dunites are mainly made of forsteritic olivine which is about 90% of the rock mass. The chemical composition of the rock is as follows: MgO 52.25%, SiO2 37.5% and Fe2O3 8.3%. These mineralogical and chemical characteristics are met the need of iron-steel and refractory industry. The olivine deposits of Kizildag with 9 billion (9,000,000,000) tons of reserve is one of the largest olivine resource in the world (The largest deposit is found in Aheim, Norway). The ultramafic rocks are also the host rocks for chromite deposits which can be counted as important. Between the years of 1990 and 2000, approximately 100,000 tons of chromite was exploited. After the year of 2000, economical disadvantages of the chromite mining in the region, the extraction of chromite were ended since the olivine mining was found much more profitable in the mass. The chromitiferous ore is in lentile shape in general and sometimes banded and disseminated. The grade of chromite ore is about 50.54% as Cr2O3. The chromites can be classified as Al-rich, ferrous chromite ore according to their chemical composition. The geological and chemical features of the chromites can be compared to the well known Alpine type chromite deposits. © 2006. International Scientific Conference SGEM.