Mescitli (Torul/Gümüşhane) ve Çevresindeki Eosen Yaşlı Volkanik Kayaçların Petrografik, Jeokimyasal ve Petrolojik Özellikleri

Yıl 2016, Cilt: 6 Sayı: 2, 89 - 116, 31.07.2016

Abdullah Kaygusuz Kübra Şahin

https://doi.org/10.17714/gufbed.2016.06.010

Cited By: 4

Öz

Doğu Pontid’lerin Güney Zonunda Mescitli (Torul/Gümüşhane) ve çevresinde yüzeylenen Eosen yaşlı volkanik kayaçlar mineralojik, petrografik ve jeokimyasal olarak incelenmiştir. Mescitli volkanitleri bazaltik andezit, bazaltik traki andezit, traki andezit, andezit, dasit ve riyolit bileşiminde olup, başlıca plajiyoklas, alkali feldispat, kuvars, hornblend, ojit ve biyotit minerallerinden oluşurlar. Volkanitler kalk-alkali karakterli olup, orta-yüksek K içeriğine sahiptirler. Büyük iyon yarıçaplı litofil elementler ve hafif nadir toprak elementlerce zenginleşmiş, yüksek çekim alanlı elementler bakımından tüketilmişlerdir. Kondrite normalize edilmiş nadir toprak element dağılımları, düşük-orta derecede zenginleşmeyle konkav şekilli olup (La_N/Lu_N=5-14), volkanitleri oluşturan kayaçların benzer kaynaktan itibaren oluştuklarını gösterirler. Volkanitlerin gelişiminde başlıca ayrımlaşma, daha az oranda da özümleme ± magma karışımı rol oynamıştır. Tüm bu veriler, volkanitlerin köken magmasının muhtemelen daha önce yitimle ilişkili olaylardan türeyen sıvıların metazomatizması yoluyla zenginleşmiş, yarı kıtasal litosferik manto kaynağı olabileceğini gösterir.

Anahtar Kelimeler

Doğu Pontidler, Eosen, Jeokimya, Mescitli volkanitleri, Petroloji, Torul

Kaynakça

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