Preliminary Ages of Granitic Rocks in the Northwest of Gönen (Biga Peninsula), NW Anatolia

Abstract

U-Pb analyses of zircon grains from the granitic rocks exposed on the northwestern of Gönen in the Biga Peninsula (NW Anatolia) were performed by LA-ICPMS. NE-SW-trending granites have brownish yellow color and feldspar, quartz minerals are visible within granitic rocks. These granitic rocks are unconformably overlain by Jurassic sandstones of the Bayırköy Formation and gray-colored Bilecik limestone. The main mineral assemblage of granites is composed of orthoclase, plagioclase, quartz, biotite, muscovite and chlorite. Zircon and apatite minerals occur as accessory minerals. Most zircon grains have oscillatory zoning showing the magmatic origin. U-Pb analyses of zircon minerals from granitic rocks yielded the concordia age of 323.6±1.7 Ma and this concordia age state the crystallization age of granites. U-Pb zircon age show that Early Carboniferous magmatism is present in the Sakarya Zone, which is related to subduction event resulted from the amalgamation of tectonic units during the Variscan orogeny. The Variscan evolution of the Sakarya Zone resembles the Carboniferous events in the Balkans, Pelagonian Zone, Rhodope Massif and central Europe in terms of Carboniferous magmatism, metamorphism and geological evolution.

Keywords

• U-Pb,zircon,granite,Carboniferous magmatism,NW Anatolia

Gönen (Biga Yarımadası) Kuzeybatısında Yer Alan Granitin Yaşına İlişkin İlk Bulgular, KB Anadolu

Abstract

Biga Yarımadası’nda (KB Anadolu) Gönen’in kuzeybatısında yüzlek veren granitik kütlenin içerisindeki zirkon tanelerinden LA-ICPMS ile U-Pb izotop analizleri yapılmıştır. KD-GB yönelime sahip granit sarımsı kahve renkli olup feldspat ve kuvars mineralleri gözle ayırt edilebilmektedir. Granitik kütlenin üzerine uyumsuz bir dokanakla Jurasik yaşlı Bayırköy Formasyonuna ait kumtaşları ve gri, bej renkli Bilecik kireçtaşı gelmektedir. Granitlerin genel mineral bileşimi ortoklas, plajiyoklas, kuvars, biyotit, muskovit ve klorit minerallerinden oluşmaktadır. Aksesuar mineral olarak ise zirkon ve apatit mineralleri gözlenmektedir. Zirkon tanelerinin tamamı magmatik kökeni gösteren zonlanmaya sahiptir. Granit içerisindeki zirkon minerallerinden elde edilen U-Pb analizleri 323.6±1.7 My konkordiya yaşını vermiştir ve bu yaş granitlerin kristalizasyon yaşını ifade etmektedir. U-Pb yaşları Sakarya Zonu’nda Erken Karbonifer’de bir magmatizmanın olduğunu göstermektedir. Bu Erken Karbonifer magmatizması Variskan orojenezi sırasında tektonik birimlerin bir araya gelmesine neden olan yitim olayı ile ilgilidir. Sakarya Zonu’nun Variskan evrimi Karbonifer magmatizması, metamorfizması ve jeolojik evrimi bakımından Balkanlar’da, Pelagoniyan Zonu’nda, Rodop Masifi’nde ve orta Avrupa’da gelişen Karbonifer olaylarına benzerlik göstermektedir.

Keywords

• KB Anadolu,U-Pb,zirkon,granit,Karbonifer magmatizması

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