Kapadokya volkanik provensi'ne ait Göllüdağ obsidiyenlerin mineralojisi
Küçük Resim Yok
Tarih
2010
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Niğde Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışma Kapadokya Volkanik Provensi'ne (KVP) ait Göllüdağ obsidiyenlerinin mineralojik incelemesini kapsamaktadır.Siyah obsidiyen Göllüdağ volkanizmasının tipik bir ürünüdür. Birim genellikle asidik karakterli volkanizma ürünü olan tüf, tüfit, perlit, pomza, obsidiyen, riyolit ve andezitlerden oluşmaktadır.Parlak kesitlerin mikroskobik incelemelerinde öz, yarı öz şekilli limonitleşmiş konsantrik kabuklu pirit psödomorfları, obsidiyenlerin bazı kesimlerinde zenginleşmiş, oksitlenerek obsidiyenleri boyamış, yer yer de dissemine olarak dağılım gösteren demir hidroksitler çok sık gözlemlenmektedir.Obsidiyenlerin ince kesitlerinin mikroskobik incelemelerinde, camsı hamur maddesi içerisinde ince çubuksu zeolit, feldispat gibi kristalin mikrolitlerin yönlenmesiyle akma dokuları, ve mikrolitlerin ve fenokristallerin de yer aldığı vitrofirik dokular hakimdir. Obsidiyenler volkanik camdan oluşan hamur içerisinde bulunan fenokristalleri; mikroklin, sanidin, anortoklas, diyopsit, biyotit ve perlit mineralleridir.Obsidiyenler üzerinde yapılan SEM analizleri sonucunda, Tuz (Halit) ve bor mineralleri, alkali feldspat (anortoklas, sanidin ve mikroklin), biyotit den oluşan fenokristaller, cevher minerali olarak da hematit belirlenmiştir.Orta Anadolu obsidiyenlerinin majör element analiz sonuçlarından onların riyolitik bileşimde ve kalkalkalen nitelikte oldukları anlaşılmıştır.Anahtar sözcükler: Kapadokya Volkanik Provensi(KVP), Göllüdağ, obsidiyen, perlit.
This study contains mineralogical investigation of Quaternary aged Obsidians (Çiftlik ?Niğde) that belong to the Cappadocia Volcavic Province (CVP).Black obsidian is a typical product of Göllüdağ volcanism. This unit generally consists of tuff, tuffite, perlite, pumic, obsidian, rhyolite and andesite with acidic characteristic of volcanism products.In microscopic investigation of polished sections, pseudomorph pyrite with limonitised concentric shell in pure and semi-pure shape, iron hydroxsides that are rich in some parts of obsidians which colored the obsidians by oxidation, are frequently observed.In the microscopic investigation of thin section of obsidians, flow banding textures directed by direction of thin bar shaped zeolite and feldspar within the glassy groundmass and vitrophyric textures formed by microlite and phenocrystals were dominant. The obsidians consist of phenocrystals, microlites, sanidine, orthoclase, diopsite, biotite and perlite minerals found in groundmass formed by volcanic glass.From the analysis of Scanning Electron Microscope (SEM) of Obsidians, salt (halite), and bor minerals, phenocrystals consisting of alkaline feldspar (orthoclase, sanidine and microline) biotite as silicate minerals and hematite as ore minerals have been determined.From the results of major element analysis of Central Anatolian obsidians, They it is understood that have been in rhyolitic composition and in the calc-alkaline character.Key words: Volcanic Province of Cappadocia, Göllüdağ, 0bsidian, perlite.
This study contains mineralogical investigation of Quaternary aged Obsidians (Çiftlik ?Niğde) that belong to the Cappadocia Volcavic Province (CVP).Black obsidian is a typical product of Göllüdağ volcanism. This unit generally consists of tuff, tuffite, perlite, pumic, obsidian, rhyolite and andesite with acidic characteristic of volcanism products.In microscopic investigation of polished sections, pseudomorph pyrite with limonitised concentric shell in pure and semi-pure shape, iron hydroxsides that are rich in some parts of obsidians which colored the obsidians by oxidation, are frequently observed.In the microscopic investigation of thin section of obsidians, flow banding textures directed by direction of thin bar shaped zeolite and feldspar within the glassy groundmass and vitrophyric textures formed by microlite and phenocrystals were dominant. The obsidians consist of phenocrystals, microlites, sanidine, orthoclase, diopsite, biotite and perlite minerals found in groundmass formed by volcanic glass.From the analysis of Scanning Electron Microscope (SEM) of Obsidians, salt (halite), and bor minerals, phenocrystals consisting of alkaline feldspar (orthoclase, sanidine and microline) biotite as silicate minerals and hematite as ore minerals have been determined.From the results of major element analysis of Central Anatolian obsidians, They it is understood that have been in rhyolitic composition and in the calc-alkaline character.Key words: Volcanic Province of Cappadocia, Göllüdağ, 0bsidian, perlite.
Açıklama
Fen Bilimleri Enstitüsü, Jeoloji Mühendisliği Ana Bilim Dalı
Anahtar Kelimeler
Jeoloji Mühendisliği, Geological Engineering
