Mineralogical, petrographical and geochemical characterization of chrysotile in the Arızlı ophiolitic mélange (Afyon-Şuhut, Türkiye)

Abstract

This research examines the mineralogical, geochemical, and microscopic properties of chrysotile (fibrous serpentine) mineralization in the ophiolitic mélange units of the Arızlı locality in Şuhut, Afyonkarahisar, Türkiye. A comprehensive assessment of six distinct rock samples was conducted using Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy–energy dispersive spectroscopy (SEM–EDS), and X-ray fluorescence (XRF) examination. Raman spectra exhibited specific bands indicative of chrysotile (686, 521, 376, and 230 cm⁻¹), with some samples also displaying peaks for lizardite (687, 458, 377 cm⁻¹) and antigorite. FTIR spectra exhibited significant absorption bands at 3682 cm⁻¹ (O–H), 943 cm⁻¹, and 602 cm⁻¹, corresponding to Si–O–Mg and Si–O–Si stretching vibrations. SEM examinations verified the existence of fibrous morphologies between 5 and 200 µm in length, exhibiting distinctive spiral and elongated shapes. EDS examination revealed elevated concentrations of Mg and Si, aligning with the optimal chrysotile composition (up to 43.6% MgO and 43.4% SiO₂). XRF analysis revealed MgO concentrations ranging from 35.34% to 39.21%, SiO₂ from 35.34% to 40.52%, Fe₂O₃ from 6.39% to 7.31%, and Ni levels between 1186 and 1588 ppm. The Cr₂O₃ concentration varied from 0.21% to 0.36%, suggesting an ultramafic origin. Elevated amounts of Ni and Cr indicate a potential origin from olivine-rich protoliths. The findings suggest that the chrysotile deposit in Arızlı has mineralogical and geochemical similarities to naturally occurring serpentine described in other Turkish ophiolitic regions, including Sivas, Tekirova, and Karaçam.

Keywords

• Chrysotile
• Ophiolitic mélange
• FTIR
• SEM-EDS
• Geochemistry

Arızlı (Afyon-Şuhut) ofiyolitik melanjında krizotil oluşumlarının mineralojik, petrografik ve jeokimyasal karakterizasyonu

Öz

Bu çalışma, Afyonkarahisar ili Şuhut ilçesi Arızlı mevkiindeki ofiyolitik melanj birimleri içerisinde yer alan krizotil (lifsi serpantin) mineralizasyonunun mineralojik, petrografik ve jeokimyasal özelliklerini incelemektedir. Altı farklı örnek üzerinde Raman spektroskopisi, Fourier dönüşümlü kızılötesi spektroskopisi (FTIR), taramalı elektron mikroskobu–enerji dağılımı spektroskopisi (SEM–EDS) ve X-ışını floresans (XRF) analizleri yapılmıştır. Raman analizlerinde krizotile ait karakteristik bantlar (686, 521, 376 ve 230 cm⁻¹) net şekilde gözlenmiş; bazı örneklerde lizardit (687, 458, 377 cm⁻¹) ve antigorit spektral izleri de tespit edilmiştir. FTIR spektrumlarında, OH bağlarını gösteren 3682 cm⁻¹, Si–O–Mg ve Si–O–Si gerilme titreşimlerine karşılık gelen 943 ve 602 cm⁻¹ bantları gözlenmiştir. SEM görüntülerinde, liflerin 5–200 µm arasında değişen uzunluklarda olduğu ve tipik sarmal yapılar geliştirdiği belirlenmiştir. EDS analizleri Mg (%43.6 MgO’ya kadar), Si (%43.4 SiO₂’ye kadar) ve düşük miktarda Fe ile krizotilin teorik bileşimiyle uyumludur. XRF analizlerinde MgO %35.34–39.21 ve SiO₂ %35.34–40.52 aralığında, Fe₂O₃ %6.39–7.31, Ni 1186–1588 ppm, Cr₂O₃ %0.21–0.36 oranlarında belirlenmiş olup bu değerler serpantinleşmiş ultramafik kayaçlara işaret etmektedir. Özellikle yüksek Ni ve Cr içerikleri, mineralizasyonun ultramafik kayaç kökenli olduğunu düşündürmektedir. Elde edilen tüm veriler, Arızlı’daki krizotil mineralizasyonunun Türkiye’deki Sivas, Tekirova ve Karaçam gibi benzer ofiyolitik ortamlarda tanımlanan doğal serpantin oluşumları ile mineralojik ve jeokimyasal açıdan benzerlik taşıdığını ortaya koymaktadır.

Anahtar Kelimeler

• Krizotil
• Ofiyolitik melanj
• FTIR
• SEM-EDS
• Jeokimya

Kaynakça

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