Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey)

GÜNGÖR, Yıldırım; AYSAL, NAMIK; Yılmaz Şahin, Sabah

Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey)

Sabah Yılmaz ŞAHİN, (İstanbul Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, İstanbul, Türkiye)

Namık AYSAL, (İstanbul Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, İstanbul, Türkiye)

Yıldırım GÜNGÖR (İstanbul Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, İstanbul, Türkiye)

Turkish Journal of Earth Sciences

6 0

Yıl: 2012 Cilt: 21 Sayı: 6 Sayfa Aralığı: 1029 - 1045 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey)

Öz:

Çavuşbaşı granodiyoriti, İstanbul Zonu’nun (KB Türkiye) batısında yer alır ve Ordovisyen yaşlı sedimanter kayaçlar içerisine sokulum yapar. İntrüzyon, başlıca, granodiyorit, seyrek olarak da tonalit ve kuvars diyorit bileşimindedir. Granitik kayaçlar genellikle tanesel dokuludur ve antirapakivi, bıçağımsı biyotit, iğnemsi apatit ve plajiyoklazlarda süngerimsi hücreli çözünme/erime dokuları gibi bazı özel ‘mixing’ dokuları da gösterirler. Ana mafik mineraller hornblend ve biyotittir. Birime ait iki örneğin zirkon minerallerinde yapılan SHRIMP U-Pb yaşlandırmasında ~68 My yaşı elde edilmiş olup, plütonun Geç Kretase döneminde sokulum yaptığını göstermektedir. Çavuşbaşı granodiyoriti jeokimyasal olarak, yüksek Sr/Y ve La/Yb oranları ile düşük Y, HREE ve Eu anomalisinin olmaması ile adakitik kayaçlara benzemektedir. Plüton %63.4 >SiO2 içeren, I-tipi, metalüminolu, orta-K’lu, kalk-alkalin özelliklere sahiptir. Bu adakitik kayaçlar yüksek MgO (% 0.77–2.56 ağırlık), Mg# (45.3–59.3), LIL (Rb, K, Ba, Sr, vb.) element oranlarını içerir. İlksel εNd ve 87Sr/86Sr oranları sırasıyla 3.2–3.7 ve 0.7035–0.7036’ dır. Neo-Tetis okyanusunun kuzey kolunun kapanmasıyla ilgili İzmir-Ankara-Erzincan ve Intra-Pontid sütürları boyunca var olan dalma-batma olayının varlığı temel alındığında, adakitik magmaların dalan okyanusal dilimin amfibol-eklojit fasiyesi koşulları altında kısmi erimesi ile oluşmuş olabileceği ileri sürülebilir.

Anahtar Kelime:

Konular: Jeoloji

İstanbul Zonu’ndaki Geç Kretase yaşlı adakitik magmatizmanın petrojenezi (Çavuşbaşı granodiyoriti, KB Türkiye)

Öz:

The Çavuşbaşı granodiorite intrudes Ordovician sedimentary rocks in the western part of the İstanbul Zone (NW Turkey). The intrusion is made up mainly of granodiorite, and subordinate tonalite and quartz diorite, and has a granular texture and some special mixing textures such as antirapakivi, blade-shaped biotite, acicular apatite, spongy cellular dissolution/melting plagioclase textures. The main mafic minerals are hornblende and biotite. U-Pb in-situ dating of zircons from two samples via SHRIMP yielded weighted age values of ~68 Ma, suggesting emplacement during the Late Cretaceous. Geochemically the Çavuşbaşı granodiorite resembles adakites with high Sr/Y and La/Yb ratios, low Y and HREE contents and no Eu anomaly. It contains 63.4 (wt%) >SiO2, and is I-type, metaluminous, middle-K calc-alkaline. These adakitic rocks have high values of MgO (0.77–2.56 wt%), Mg# (45.3–59.3) and LILE (e.g., Rb, K, Ba, Sr). Initial εNd and 87Sr/86Sr values are 3.2–3.7 and 0.7035–0.7036, respectively. Based on the continuing subduction along the İzmir-Ankara and Intra-Pontide Neo-Tethyan oceanic domains and depleted Sr-Nd isotopic signatures, we suggest that the adakitic magmas may be derived from the partial melting of an oceanic slab under amphibole-eclogite facies conditions.

Anahtar Kelime:

Konular: Jeoloji

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

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APA	Yılmaz Şahin S, AYSAL N, GÜNGÖR Y (2012). Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). , 1029 - 1045.
Chicago	Yılmaz Şahin Sabah,AYSAL NAMIK,GÜNGÖR Yıldırım Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). (2012): 1029 - 1045.
MLA	Yılmaz Şahin Sabah,AYSAL NAMIK,GÜNGÖR Yıldırım Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). , 2012, ss.1029 - 1045.
AMA	Yılmaz Şahin S,AYSAL N,GÜNGÖR Y Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). . 2012; 1029 - 1045.
Vancouver	Yılmaz Şahin S,AYSAL N,GÜNGÖR Y Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). . 2012; 1029 - 1045.
IEEE	Yılmaz Şahin S,AYSAL N,GÜNGÖR Y "Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey)." , ss.1029 - 1045, 2012.
ISNAD	Yılmaz Şahin, Sabah vd. "Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey)". (2012), 1029-1045.

APA	Yılmaz Şahin S, AYSAL N, GÜNGÖR Y (2012). Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). Turkish Journal of Earth Sciences, 21(6), 1029 - 1045.
Chicago	Yılmaz Şahin Sabah,AYSAL NAMIK,GÜNGÖR Yıldırım Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). Turkish Journal of Earth Sciences 21, no.6 (2012): 1029 - 1045.
MLA	Yılmaz Şahin Sabah,AYSAL NAMIK,GÜNGÖR Yıldırım Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). Turkish Journal of Earth Sciences, vol.21, no.6, 2012, ss.1029 - 1045.
AMA	Yılmaz Şahin S,AYSAL N,GÜNGÖR Y Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). Turkish Journal of Earth Sciences. 2012; 21(6): 1029 - 1045.
Vancouver	Yılmaz Şahin S,AYSAL N,GÜNGÖR Y Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey). Turkish Journal of Earth Sciences. 2012; 21(6): 1029 - 1045.
IEEE	Yılmaz Şahin S,AYSAL N,GÜNGÖR Y "Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey)." Turkish Journal of Earth Sciences, 21, ss.1029 - 1045, 2012.
ISNAD	Yılmaz Şahin, Sabah vd. "Petrogenesis of Late Cretaceous adakitic magmatism in the İstanbul Zone (Çavuşbaşı granodiorite, NW Turkey)". Turkish Journal of Earth Sciences 21/6 (2012), 1029-1045.