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Journals / Gümüşhane Üniversitesi Fen Bilimleri Dergisi / 2021 / Cilt: 11 - Sayı: 4

Petrographic and geochemichal characters of the Bitlis ignimbirite

Bitlis ignimbiritinin petrografik ve jeokimyasal özellikleri

Büşra ÇAKMAK
Ayşe Didem KILIÇ
Pages
1093–1102
Publication Date
2021-10-15
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The discrepancy between three levels may be due to time interval between phase stages and magmatic processes or from the devitrification.

📌 3 Key Takeaways

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Objective & Hypothesis:In this study were investigated mineralogical and geochemical properties and phase relations of Bitlis ignimbrites being product of Nemrut volcanism.
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Key Findings & Data: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.
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Conclusion & Impact:The discrepancy between three levels may be due to time interval between phase stages and magmatic processes or from the devitrification.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Anortoklaz · Devitrifikasyon · İgnimbirit

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.

Özet

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.

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Cite This Article

ÇAKMAK, B., KILIÇ, A. D. (2021). Petrographic and geochemichal characters of the Bitlis ignimbirite. Gümüşhane Üniversitesi Fen Bilimleri Dergisi, Cilt: 11 - Sayı: 4, 1093–1102. https://ajindex.com/articles/668378

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