YENİŞARBADEMLİ (ISPARTA, TÜRKİYE) BATISINDAKİ MAFİK-ORTAÇ DAYKLARDAKİ EPİDOTLARIN MİNERALOJİSİ VE JEOKİMYASAL KARAKTERİ

Abstract

Beydağları-Karacahisar otoktonun temelini oluşturan Bozburun şistini kesen dayklar; bazalt, bazaltik andezit ve andezit bileşimlidir. Bazalt, bazaltik andezit, ve andezit bileşimli kayaçlarda bulunan epidotların incelenmesi bu çalışmanın konusudur. Özşekilli ve yarı özşekilli epidotların, hem magmadan doğrudan kristallenmiş hem de biyotit, hornblend ve plajioklas minerallerinin alterasyonu sonucunda oluştuğu tespit edilmiştir. Magmatik epidotların, Ps içeriği %25-32 arasında olup, genellikle allanit çekirdekli ve düşük TiO2 konsantrasyonuna (<%0,02) sahiptir. İkincil epidotların da Ps değeri %0-25 arasında biyotit alterasyonu ve %33-38 arasında biyotit alterasyonunu göstermektedir (Tulloch, 1979). Genellikle bunlara klorit, apatit ve titanit mineralleri eşlik etmektedir. Dayklardaki epidotların Ps içeriği %7 ile 41,5 arasında değişmektedir. XFe+3 değeri 0,222-1,000 arasında olan epidot grubu mineraller, klinozoisit ve epidot kompozisyonludur. Magmatik epidotlarda gözlenen halkalı zonlanma, kristallenme sırasında magmanın kompozisyonunda veya oksijen fugasitesinde döngüsel bir değişim meydana geldiğinin göstergesidir. Dokusal ve kimyasal özellikleri ile Ps içerikleri göz önüne alındığında magmatik epidotların muhtemel yüksek H2O içeriğine sahip magmadan, düşük basınç ve yüksek oksijen fügasitesi altında kristallendiği belirlenmiştir.

Keywords

• Batı-Orta Toroslar
• Dayk
• Mineral Kimyası
• Epidot

MINERALOGICAL AND GEOCHEMICAL CHARACTERISTICS OF EPIDOTES IN THE MAFIC-INTERMEDIATE DYKES IN WEST OF YENİŞARBADEMLİ (ISPARTA, TURKEY)

Abstract

The dykes cutting the Bozburun schist forming the base of the Beydağları-Karacahisar autochthonous are basalt, basaltic andesite and andesite in composition. The examination of the epidotes found in these basalt, basaltic andesite and andesite rocks is the subject of this study. It has been determined that euhedral and subhedral epidotes are formed as a result of both direct crystallization from magma and alteration of biotite, hornblende and plagioclase minerals. The Ps content of magmatic epidotes is between 25-32% and generally has an allanite core and low TiO2 concentration (<0.02%). The Ps value of secondary epidotes also shows biotite alteration between 0-25% and biotite alteration between 33-38% (Tulloch, 1979). They are generally accompanied by chlorite, apatite and titanite minerals. The Ps content of epidotes in the dykes varies between 7 and 41.5%. The epidote group minerals with XFe+3 values between 0.222-1.000 are composed of clinozoisite and epidote. The oscillatory zoning observed in magmatic epidotes is an indication of a cyclic change in the composition or oxygen fugacity of the magma during crystallization. Considering their textural and chemical properties and Ps contents, it was determined that magmatic epidotes were crystallized from magma with a high H2O content, under low pressure and high oxygen fugacity.

Keywords

• West-Central Taurides
• Dyke
• Mineral Chemistry
• Epidote

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