The effect of olivine serpentinization on uniaxial compressive strength and apparent porosity in basalts

Year 2024, Volume: 14 Issue: 1, 197 - 207, 15.03.2024

Kadir Karaman , Hasan Kolaylı , Yaşar Çakır , Erdoğan Timurkaynak

https://doi.org/10.17714/gumusfenbil.1337324

Abstract

In this study, a relationship was observed between increasing rate of serpentinization with rock’s uniaxial compressive strength (UCS) and apparent porosity, and the reasons for serpentinization were investigated. The study area, which is stratigraphically at different elevation levels, is divided into three classes (A1, M2 and M3) according to the alteration zones. Petrographic thin section studies and Scanning Electron Microscopy (SEM) analyses were also carried out. According to the thin section analysis, serpentinization of olivine was obtained 8.25% for A1 basalts, while this value was 75.5% for M3. SEM analyses indicated that the samples have some microstructural defects such as micro-cracks especially in M2 and M3 basalts. The correlation degree between serpentinization rate with UCS and n (%) of basalts varied between 0.96-0.97 both for dry and saturated samples. However, the average values (serpentinization rate, UCS, n (%)) of A1, M2 and M3 exhibited the higher correlation coefficients (r ≈1). The proximity of the volcanic cone and the fault line of M3, as well as its higher stratigraphical elevations, were considered to be the important factors causing serpentinization.

Keywords

Apparent porosity, Serpentinization rate, Uniaxial compressive strength

Bazaltlarda olivin serpantinleşmesinin tek eksenli basınç dayanımına ve görünür gözenekliliğe etkisi

Abstract

Bu çalışmada, artan serpantinleşme oranı ile kayanın tek eksenli basınç dayanımı (UCS) ve görünür gözenekliliği arasında bir ilişki gözlemlenmiş ve serpantinleşmenin sebepleri araştırılmıştır. Stratigrafik olarak farklı kot seviyelerinde bulunan çalışma alanı, alterasyon zonlarına göre üç sınıfa (A1, M2 ve M3) ayrılmıştır. Ayrıca, petrografik ince kesit çalışmaları ve Taramalı Elektron Mikroskobu (SEM) analizleri yapılmıştır. İnce kesit analizine göre olivinin serpantinleşmesi A1 bazaltları için %8.25 iken, bu değer M3 bazaltları için %75.5'tir. SEM analizleri, numunelerin özellikle M2 ve M3 bazaltlarında mikro çatlaklar gibi bazı mikro-yapısal kusurlara sahip olduklarını göstermiştir. Serpantinleşme oranı ile UCS ve n (%) arasındaki korelasyon derecesi hem kuru hem de doygun numuneler için 0.96-0.97 arasında değişmiştir. Ancak A1, M2 ve M3'ün ortalama değerleri (serpantinleşme oranı, UCS, n (%)) daha yüksek korelasyon katsayıları (r ≈1) sergilemiştir. M3'ün volkan konisi ve fay hattına yakınlığı ile stratigrafik olarak daha yüksek kotlardaki konumu serpantinleşmeye neden olan önemli faktörler olarak değerlendirilmiştir.

Keywords

Görünür gözeneklilik, Serpantinleşme oranı, Tek eksenli basınç dayanımı

Thanks

Yazarlar, SEM analizlerindeki yardımları için Öğr. Gör. Ümit Özsandık’a teşekkür ederler.

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