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  • Küçük Resim
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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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    Geology, petrography and geochemistry of the subduction related volcanic rocks, west of Konya, Central Anatolia
    (2003) Kurt, H.; Özkan, A. M.; Koçak, K.
    Konya'nın KB'sı Neojen yaşlı volkanik breş, aglomera, tüfit, tüfve andesit, dasit ve bazaltik andezit lavlarıyla kaplıdır. Bazaltik andezitler yaklaşık olarak % 7-10 olivin, %3-5 klinopiroksen, %5-10 ortopiroksen, %60-70 plajiyoklaz ve % 5-J O opak mineral fenokrisialleri içerirken andezitik lavlar % 50-60 plajiyoklaz, % 10-15 hornblende, %5 biyotit, % 2 klinopiroksen, % l sanidin, %1 kuvars ve % 3 opak mineral oluşmaktadır. Dasitikkayaçlar%35-40 plajiyoklaz, % 10-15 kuvars, %15-20 hornblend, %10-12 biyotit, % 2-3 opak mineral, % 3 sanidin içerirler. Dasit ve andezitik kayaçlar salınım zonlanma ve elek dokusuna sahiptirler. Volkanik kayaçların bileşimi bazaltik andezitten dasite kadar değişir ve tipik bir kalkalkalin karakter gösterirler. Ana, ve iz element içeriklerinin değişimi hornblend, plajiyoklaz, piroksen, ve titanlı magnetitin fraksiyonel kristalleşmesine ileri sürmektedir. Plajiyoklaz farklılaşması zayıf negatif Eu anomalisinin gelişimi ile doğrulanmaktadır. Yüksek LREE/HREE ve LILE/HFSE oranlan çalışılan örneklerin aktif kıta kenarında dalma batma ile ilişkili bir magmadan oluştuğunu göstermektedir. Kayaçların oldukça farklılaşmış ve zengin REE grafiği bu kayaçların oluşumunda kıta kabuğunun içerildiğine işaret etmektedir.
  • Küçük Resim
    Öğe
    Petrological and source region characteristics of ophiolitic hornblende gabbros from the Aksaray and Kayseri regions, central Anatolian crystalline complex, Turkey
    (PERGAMON-ELSEVIER SCIENCE LTD, 2005) Koçak, K.; Işık, F.; Arslan, M.; Zedef, Veysel
    Many Neo-Tethyan ophiolitic bodies are well exposed as thrust-slices in Central Anatolia and are predominantly represented by massive hornblende gabbros, most of which are cut by Supra Subduction Zone (SSZ) plagiogranites. The allochthonous gabbros are distinct from their autochthonous counterparts, with their mineralogy including both igneous hornblende, relict diopside rimmed by replacement hornblende and their chemical composition corresponding mostly to gabbro rather than diorite. The results of major and trace element analyses of forty-two samples, and REE analyses of nine samples, indicate that the homblende gabbros are SSZ-type and formed from a wet magma by high-degree partial melting of peridotite possibly coupled with contamination by predominantly neighbouring-slab derived fluids within an intra-oceanic back-arc basin. The mafic magmas then underwent high-level fractional crystallization involving titaniferous magnetite, diopside, tschermakite and possibly olivine. Emplacement was followed by extensive ocean-floor metamorphism, which has induced crystallization (or recrystallization) of chlorite, biotite, amphiboles and mobilisation of most of the major elements such as alkali and alkali earth elements, and some LREE. (c) 2004 Elsevier Ltd. All rights reserved.