Karakaya Karmaşığı’nın Düşük Dereceli Metamorfik Tarihçesine Klorit Mineralojisi ve Jeokimyası ile Yaklaşımlar

Year 2015, Volume: 58 Issue: 2, 55 - 83, 01.04.2015

Sema Tetiker Hüseyin Yalçın , Ömer Bozkaya

Abstract

Karakaya Karmaşığı’na ait farklı tektonik konum ve evrime sahip birimlerde yaygın olarak klorit mineralleri bulunmaktadır. Bu çalışmada karmaşığın diyajenetik-metamorfik evriminin yorumlanmasında ve farklı birimlerin jeolojik tarihçelerinin aydınlatılmasında kloritlerin bir parametre olarak kullanılabilirliği araştırılmıştır. Düşük-çok düşük dereceli metamorfik kayaçlarda birincil ve ikincil kökenli olabilen klorit mineralleri; mavi ve kahverengi girişim renklerine ve oldukça düşük çift kırıcılık gösteren optik izotropik görünüme sahiptirler. Kloritler kayaçların matriksinde, gözeneklerinde ve/veya podlarda levhamsı/yapraksı ve yer yer ışınsal biçimlerde görülmektedir. X-ışınları kırınımı (XRD) verilerine göre; bütünüyle IIb politipine sahip olan Mg-Fe kloritler (trioktahedral) brunsvigit-diyabantit-şamozit gibi farklı bileşimler sergilemektedir. Ayrıca, klorit mineralleri türedikleri kayaçlar bakımından felsik ve metabazik kökene karşılık gelmektedir. Benzer biçimde kloritlerin ana element içerikleri ve yapısal formülleri gibi jeokimyasal verileri de farklı bileşim ve kökene işaret etmektedir. Klorit minerallerinin iz ve özellikle nadir toprak element (NTE) içerikleri metamorfizma derecesi ile bulundukları kayaca bağlı olarak şistten sleyte doğru artmaktadır. Bu ilişki kondrit-normalize edilmiş iz element ve NTE dağılımlarında belirgin olarak fark edilebilmektedir. Bu değişimlerin klorit minerallerinin yapıları, oluşum mekanizmaları ve oluştukları tektonik ortamlar ile ilişkili olduğunu göstermektedir. Diğer bir ifadeyle, kloritlerin farklı jeolojik tarihçeye sahip birimlerin ayırt edilmesinde anahtar bir rol oynayabileceğini düşündürmektedir.

Keywords

Ana ve iz elementle, jeolojik evrim, Petrografi, XRD

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