Metamorfizma Basınç ve Sıcaklık Koşullarının Belirlenmesi (Jeotermobarometre): Yıldızeli (Sivas Batısı) Yöresinde Bir Uygulama

Yıl 1995, Cilt: 19 Sayı: 1, 1 - 27, 15.05.1995

Musa Alpaslan Durmuş Boztug

Öz

Metamorfik kayaçların çalışılmasında günümüze kadar kullanılagelen klasik petrografik incelemeler sonucu elde edilen izograd haritaları yardımıyla, çalışılan bölgedeki metamorfizmanın basınç ve sıcaklık koşullarına bir yaklaşımda bulunulabilmektedir. Buna karşın, jeokimyasal analiz tekniklerinin gelişmesiyle birlikte bir kayaç içerisindeki tek bir mineralin ve çevresinde yer alan diğer minerallerin kimyasal birleşimlerinin belirlenmesi olanaklı olmuştur. Dolayısıyla, bir kayaç içerisindeki minerallerin kimyasal bileşimlerinin belirlenmesi ve bunlar arasındaki reaksiyon dokularının çalışılması, metamorfik petrografinin ileri ve temel unsurları arasında yerini almıştır. Bu analizlerin gerçekleştirilmesi için ise Elektron Prob Mikro Analiz (EPMA veya EMA) yöntemi olarak isimlendirilen nokta analiz yöntemleri kullanılmaktadır. Metamorfizmada etkin olan basıncın belirlenmesi jeobarometre olarak isimlendirilmekte ve met dönüşüm reaksiyonlarından gidilerek hesaplanmaktadır. Metamorfizmanın sıcaklık koşullarının her ikisinin birden belirlenmesi yöntemi kısaca Jeotermobarometre olarak isimlendirilmektedir.

Anahtar Kelimeler

Jeotermobarometre, Jeobarometre, Metamorfizma

Kaynakça

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