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

Year 2019, Volume: 5 Issue: 2, 261 - 277, 19.12.2019

Fırat Şengün

https://doi.org/10.28979/comufbed.578769

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

Supporting Institution

Çanakkale Onsekiz Mart Üniversitesi, Bilimsel Araştırma Koordinasyon Birimi

Project Number

FBA-2018-2453

Thanks

Bu çalışma Çanakkale Onsekiz Mart Üniversitesi Bilimsel Araştırma Koordinasyon Birimi tarafından FBA-2018-2453 no’lu projeyle ve TÜBİTAK 2219 Yurt Dışı Doktora Sonrası Araştırma Burs Programı kapsamında desteklenmiştir. Bu çalışma özgün araştırma makalesi niteliğindedir

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

Project Number

FBA-2018-2453

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