Browsing by Author "Kaya, Raziye Merve"

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    Article
    Chemical and Mineralogical Characteristics of the Microscopic-Sized Epidotes in the Metamorphic Basement Rocks Within the Late Cretaceous Hatip Ophiolitic Melange in Konya (central Southern Turkey)
    (2019) Koçak, Kerim; Kaya, Raziye Merve
    At the base of the Neotethyan ophiolitic melange, widespread epidote crystals formed in metamafic rocks of the metamorphic basement, which were experienced a regional metamorphism in green-schist facies conditions. The epidote crystals is subhedral to euhedral, with high Al2O3 (26-30 %) and low Fe2O3 (5–8%) contents. It is predominantly zoisite (Xcz = 0.46 to 0.72) and subordinate epidote (Xep =0.27-0.53) in composition, with typical compositional zoning due to variable substitution of Fe3+ and Al3+ on octahedral sites and sector-zoning. The epidote is suggested to have a possible igneous origin, and to be crystallised from a wet (H2O>5 wt %) magma under low fO2 and intermediate pressure conditions during initial stage crystallisation on the basis of its petrographical and mineralogical characteristics.
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    Conference Object
    Crystallisatıon Conditions of Igneous Epidote in a Metamorphıc Sole From Neotethyan Ophiolitic Melange, Konya, Central Southern Turkey
    (GEOBALCANICA, 2019) Koçak, Kerim; Kaya, Raziye Merve
    Subhedral to euhedral epidote occurs with compositional and sector zoning in a metamorphic sole at the bottom of a Neotethyan ophiolitic mélange. The epidote is characterised by low Fe2O3 (5–8%) , high Al2O3 (26-30 %), and minor TiO2 (0.05-0.18 wt%), MnO (0.01-0.1 wt%) and MgO (0-0.12 wt%) contents. Petrographical and mineralogical characteristics and various aluminium-in- hornblende geobarometry estimates suggest that the amphibole associated with epidote was possibly crystallized from a wet tholeiitic/alkaline magma between ~3.5-7 kb pressure conditions.