Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey

GOURGAUD, Alain; Temel, Abidin; VAROL ALTAY, ELİF

Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey

ELİF VAROL ALTAY, (Hacettepe Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, Ankara, Türkiye)

Abidin TEMEL, (Hacettepe Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, Ankara, Türkiye)

Alain GOURGAUD (Blaise Pascal Univercity OPGC (Cantre de Recherce Volcanologique), 5 Rue Kessler, 63038 Clermont-Ferrand, France)

Turkish Journal of Earth Sciences

1 0

Yıl: 2008 Cilt: 17 Sayı: 4 Sayfa Aralığı: 709 - 727 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey

Öz:

Galatya Volkanik Provensi (Ankara, Turkiye)’nde yeralan Çamlıdere bölgesi, riyolitik, andezitik, trakitik, dasitik ve bazaltik kayaçlardan oluşmaktadır. Çalışma bölgesindeki en yaşlı volkanik kayaçar riyolitik, en genç olanlar ise bazaltik karakterdedir. Tüm volkanik kayaçlardaki fenokristaller, petrografik açıdan bazı dengesizlik özellikleri sergilemektedir: (a) ters, normal ve salınımlı zonlanmış elek dokulu veya elek dokusuz plajiyoklaz minerallerinin aynı kayaç içerisinde birarada bulunuşu; (b) feldispat fenokistallerinin %An içeriğindeki geniş bileşimsel değişimler; (c) aynı kayaç içerisinde, elek dokulu, elek dokusuz, normal ve ters zonlanmış piroksenlerin birlikte bulunması; (d) çevresi klinopiroksenle çevrilmiş bazı ortopiroksen fenokristallerinin varlığı; (e) amfibollerde gözlenen normal, ters zonlanma ve reaksiyon dokusu; (f) plajiyoklaz, piroksen gibi özşekilli fenokristallerin aynı tipteki kemirilmiş fenokristallerle birarada bulunuşu. Bu gibi özellikler, Çamlıdere volkanik kayaçlarının oluşumunda, magma odasında veya magmanın yükselimi sırasında gerçekleşen eriyiğin bileşimindeki ve/veya sıcaklığındaki değişimi göstermekte olup, bu durum magma karışımı gibi bir açık sistem sürecini düşündürmektedir. Mafik bir magmanın daha felsik bir magma içine karışımı kimyasal olarak zonlanmış bir magma odası ve bunu takip eden magma karışım sürecini meydana getirebilir. Bu süreç aynı zamanda ana element modellemesiyle de desteklenmiştir. Bununla birlikte, sadece magma karışımı süreci değil, bazaltik ana magmanın fraksiyonel kristalleşmesi de Galatya Volkanik Kayaçlarının oluşumunda etkendir.

Anahtar Kelime:

Konular: Jeoloji

Çamlıdere volkanik kayaçlarının evriminde magma karışımı için dokusal ve bileşimsel kanıt (Galatya Volkanik Provensi), Orta Anadolu, Türkiye

Öz:

The Çamlıdere area, in the Galatean Volcanic Province (Ankara), Turkey, is composed of rhyolitic, andesitic, trachytic, dacitic and locally basaltic rocks. The older volcanic rocks in the studied area are rhyolitic and the younger ones basaltic. The phenocrysts from all the volcanic rocks exhibit some petrographic disequilibrium features such as: (a) coexistence of reversely, normally and oscillatory zoned sieved or unsieved plagioclase in the same rock; (b) wide compositional variation of An% in feldspar phenocrysts; (c) sieved, unsieved, normally and reversely zoned pyroxenes occur together in a single rock; (d) some orthopyroxene phenocrysts are surrounded by clinopyroxene; (e) reaction textures, and normal and reverse zoning of amphibole; (f) euhedral phenocrysts such as plagioclase, pyroxene coexist with resorbed phenocrysts of the same type. Such features indicate that a wide change of melt composition and/or temperature occurred in the magma reservoir or conduit during the production of the Çamlıdere volcanic rocks and may reflect an open-system process such as magma mixing. Injection of mafic magma into a felsic magma could generate a chemically zoned magma chamber and subsequent magma mixing process. This process is also supported by major elements modelling. However, a simple mixing process is not consistent with the formation of all Galatean volcanic rocks, and fractionation of basaltic parental liquids led to evolved magmas.

Anahtar Kelime:

Konular: Jeoloji

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

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APA	VAROL ALTAY E, Temel A, GOURGAUD A (2008). Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. , 709 - 727.
Chicago	VAROL ALTAY ELİF,Temel Abidin,GOURGAUD Alain Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. (2008): 709 - 727.
MLA	VAROL ALTAY ELİF,Temel Abidin,GOURGAUD Alain Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. , 2008, ss.709 - 727.
AMA	VAROL ALTAY E,Temel A,GOURGAUD A Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. . 2008; 709 - 727.
Vancouver	VAROL ALTAY E,Temel A,GOURGAUD A Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. . 2008; 709 - 727.
IEEE	VAROL ALTAY E,Temel A,GOURGAUD A "Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey." , ss.709 - 727, 2008.
ISNAD	VAROL ALTAY, ELİF vd. "Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey". (2008), 709-727.

APA	VAROL ALTAY E, Temel A, GOURGAUD A (2008). Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. Turkish Journal of Earth Sciences, 17(4), 709 - 727.
Chicago	VAROL ALTAY ELİF,Temel Abidin,GOURGAUD Alain Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. Turkish Journal of Earth Sciences 17, no.4 (2008): 709 - 727.
MLA	VAROL ALTAY ELİF,Temel Abidin,GOURGAUD Alain Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. Turkish Journal of Earth Sciences, vol.17, no.4, 2008, ss.709 - 727.
AMA	VAROL ALTAY E,Temel A,GOURGAUD A Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. Turkish Journal of Earth Sciences. 2008; 17(4): 709 - 727.
Vancouver	VAROL ALTAY E,Temel A,GOURGAUD A Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey. Turkish Journal of Earth Sciences. 2008; 17(4): 709 - 727.
IEEE	VAROL ALTAY E,Temel A,GOURGAUD A "Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey." Turkish Journal of Earth Sciences, 17, ss.709 - 727, 2008.
ISNAD	VAROL ALTAY, ELİF vd. "Textural and compositional evidence for magma mixing in the evolution of the Çamlıdere volcanic rocks (Galatean Volcanic Province) , Central Anatolia, Turkey". Turkish Journal of Earth Sciences 17/4 (2008), 709-727.