Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey

TOPUZ, Gültekin

Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey

Gültekin TOPUZ (İstanbul Teknik Üniversitesi, Avrasya Yer Bilimleri Enstitüsü, İstanbul, Türkiye)

Turkish Journal of Earth Sciences

4 0

Yıl: 2006 Cilt: 15 Sayı: 1 Sayfa Aralığı: 75 - 94 Metin Dili: İngilizce İndeks Tarihi: 29-07-2022

Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey

Öz:

Eosen yaşlı Saraycık granodiyoriti, Bayburt, Doğu Pontidler, tektonizma sonrası yerleşmiş küçük bir sokulum kütlesi olup (yaklaşık 11 km2), tektonik olarak yanyana getirilmiş farklı nitelik ve yaştaki metamorfik ve metamorfik olmayan kayaçları kesmektedir. Sokulum sonucunda çevreleyen kayaçlarda -0.8-1 km genişliğinde bir dokanak başkalaşım halesi gelişmiştir. Bütün litolojilerde ince kesit ölçeğinde dengesizlik dokuları, başkalaşım halesinin iç zonlarında bile, yaygınca gözlenmektedir. Dokanak başkalaşımının koşulları, metapelitlerde bariz bir dengesizlik belirtisi göstermeyen mikro-alanlara uygulanan faz dengeleri ile tahmin edildi: Dokanak başkalaşımı sonucunda oluşan mineral toplulukları (sözgelimi, andaluzit + korund + K-feldspat), granodiyoritin içerdiği hornblendlerin Al içeriklerine dayalı olarak yapılan basınç tahmini ve andaluzit durağanlık alanında bölümsel ergime sığ yerleşim derinliklerine işaret etmektedir (0.21 ±0.05 GPa = $sim$5-8 km). Dokanak başkalaşımı sırasında, doruk sıcaklıkları dokanaktan 400 m uzakta 430-520 °C'den dokanağın bitişiğinde $geq$730 °C'ye kadar değişmektedir. Sokulum dokanağından $leq$30 m uzaklıklarda pelitik litolojiler, gerek andaluzit gerekse sillimanit durağanlık alanlarında bölümsel ergimeye uğramış olduklarının izlerini taşımaktadır. Bazik litolojiler genelde yapraklanmaya paralel uzanan, 2-50 mm kalınlığında ve skarnlara benzer mineraloji sunan seviyeler içermektedir. Bu seviyeler olasılıkla akışkanların bazik litolojilerle etkileşimi sonucunda oluşmuştur. Dengesizlik dokuların yaygınlığı baskın olarak dokanak başkalaşımı öncesi aşamadan kalıntı varlığından ziyade, dokanak başkalaşımı sırasında sıcaklık ve/veya akışkan kimyasının zamansal değişimiyle bağlantılıdır.

Anahtar Kelime:

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	TOPUZ G (2006). Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. , 75 - 94.
Chicago	TOPUZ Gültekin Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. (2006): 75 - 94.
MLA	TOPUZ Gültekin Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. , 2006, ss.75 - 94.
AMA	TOPUZ G Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. . 2006; 75 - 94.
Vancouver	TOPUZ G Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. . 2006; 75 - 94.
IEEE	TOPUZ G "Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey." , ss.75 - 94, 2006.
ISNAD	TOPUZ, Gültekin. "Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey". (2006), 75-94.

APA	TOPUZ G (2006). Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. Turkish Journal of Earth Sciences, 15(1), 75 - 94.
Chicago	TOPUZ Gültekin Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. Turkish Journal of Earth Sciences 15, no.1 (2006): 75 - 94.
MLA	TOPUZ Gültekin Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. Turkish Journal of Earth Sciences, vol.15, no.1, 2006, ss.75 - 94.
AMA	TOPUZ G Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. Turkish Journal of Earth Sciences. 2006; 15(1): 75 - 94.
Vancouver	TOPUZ G Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey. Turkish Journal of Earth Sciences. 2006; 15(1): 75 - 94.
IEEE	TOPUZ G "Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey." Turkish Journal of Earth Sciences, 15, ss.75 - 94, 2006.
ISNAD	TOPUZ, Gültekin. "Contact metamorphism around the Eocene Saraycık granodiorite, Eastern Pontides, Turkey". Turkish Journal of Earth Sciences 15/1 (2006), 75-94.