Petrographic and geochemichal characters of the Bitlis ignimbirite

Year 2021, Volume: 11 Issue: 4, 1093 - 1102, 15.10.2021

Büşra Çakmak , Ayşe Didem Kılıç

https://doi.org/10.17714/gumusfenbil.920804

Abstract

In this study were investigated mineralogical and geochemical properties and phase relations of Bitlis ignimbrites being product of Nemrut volcanism. The Bitlis ignimbirite have different colors and composition ratios. Its mineralogical composition is a pyroclastic rock sequence consisting of plagioclase, sanidine, anorthoclase, augite, olivine, biotite, hematite, quartz and ilmenite. The Bitlis ignimbrite is formed as a result of eruption of magma in trachyh-riolite composition formed in volcanic arcs, back-arc or intra-continental areas or contamination of magma during rising in intra-continental fracture. There are differences in component ratio, chemical composition and color between ignimbrite levels. This unit showed pre-caldera period and shows mainly pumice, rock fragments, oriented fiammes, features such as sepiolytic particles together with conversion to sanidine mineral indicate at least two phases and the devitrication partially causes color difference. Mineral alterations and high Ba/Sr (1.48-1.92), Ba/Ta (33.0-34.6), Th/La (0.24-0.25), Ba/La (11.2-15) ratios indicates metamorphism or crustal contamination post or during formation of ignimbrite. The geochemical features of the Bitlis ignimbrite partly show a small volume silicic volcanism. The discrepancy between three levels may be due to time interval between phase stages and magmatic processes or from the devitrification.

Keywords

Anortoclase, Devitrification, Ignimbirite, Trace element geochemistry, Fe-Ti oxides, The Nemrut

Project Number

Fübap-MF-19.11

Bitlis ignimbiritinin petrografik ve jeokimyasal özellikleri

Abstract

Bu çalışmada Nemrut volkanizması ürünü Bitlis ignimbiritlerin mineralojik ve jeokimyasal özellikleri ile faz ilişkileri incelenmiştir. Bitlis ignimbiriti, farklı renk ve bileşim oranına sahiptir. Mineralojik bileşimi plajiyoklaz, sanidin, anortoklaz, ojit, olivin, biyotit, hematit, kuvars ve ilmenitten oluşan piroklastik bir kayaç istifidir. Bitlis ignimbiriti volkanik yay, yay gerisi veya kıta içi alanlarda oluşan, trakit- riyolit bileşimindeki magmanın püskürmesi veya kıta içi çatlaklarda magmanın yükselimi sırasında kirlenmesi sonucu oluşur. İgnimbirit seviyeleri arasında bileşen oranı, kimyasal bileşim ve renk farklılığı vardır. Kaldera öncesi dönemi temsil eden ve başlıca pomza, kayaç parçaları, yönlü fiammeler, sepiolitik parçacıklar ile sanidin mineraline dönüşüm gibi özellikler en az iki fazı işaret eder ve devitrikasyonda kısmen renk farklılığına sebep olur. Mineral alterasyonları ve yüksek Ba/Sr (1.48-1.92), Ba/Ta (33.0-34.6), Th/La (0.24-0.25), Ba/La (11.2-15) oranlarından ignimbiritin oluşumu sırasında veya sonrasında, metamorfizma veya kabuksal kirlenmenin geliştiğini gösterir. Bitlis ignimbiritinin jeokimyasal özellikleri kısmen küçük hacimli silisik bir volkanizmayı gösterir. Üç farklı seviye arasındaki farklılık, magmatik süreçler ve faz evreleri arasındaki zaman aralığı veya devitrifikasyondan kaynaklanabilir.

Keywords

Anortoklaz, Devitrifikasyon, İgnimbirit, İz element jeokimyası, Fe-Ti oksit, Nemrut

Supporting Institution

Fırat Üniversitesi

Project Number

Fübap-MF-19.11

Thanks

Bu çalışma, Fırat Üniversitesi Bilimsel Araştırma Projeleri (FÜBAP) Birimi tarafından, Fübap-MF-19.11 no’lu yüksek lisans tez projesi kapsamında desteklenmiş ve projelendirilmiştir. Mali kaynak sağlayan, üniversitemiz FÜBAP birimine teşekkür ederiz.

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