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Journals / Maden Tetkik ve Arama Dergisi / 2026 / Cilt: 158 Sayı: 158

Mineralogy, petrography and origin of hydrothermal alteration in Eocene magmatites in Central Anatolia (Sivas-Turkey)

Zeynel Başıbüyük(Ahi Evran Üniversitesi Mühendislik Mimimarlık Fakültesi Jeoloji Mühendisliği Bölümü Kırşehir)0000-0003-2845-148X
Hüseyin Yalçın(Cumhuriyet Üniversitesi Mühendislik Fakültesi Jeoloji Mühendisliği Bölümü Sivas)0000-0001-9539-2817
Pages
141–164
Publication Date
2019-04-25
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AI Summary & Key Takeaways

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

Kaolinite (T) is mostly in the form of pseudohexagonal platies, I-S (R1, R3 as argillic alteration origins, 1Md, 2M1, 1M and R3 as sericitic alteration origins) forming fi ber-acicular bundles parallel to each other.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Three different types of hydrothermal alterations have occurred in the Eocene magmatics of the northern part of Sivas-Turkey which include propylitic phyllic / sericitic and argillic.
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Key Findings & Data:The clay formations are concentrated in two major zones; extending in NE-SW direction and intersecting both plutonic and volcanic rocks with circular opening cracks within the volcanics parallel to the plutonic-volcanic contact.
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Conclusion & Impact:Kaolinite (T) is mostly in the form of pseudohexagonal platies, I-S (R1, R3 as argillic alteration origins, 1Md, 2M1, 1M and R3 as sericitic alteration origins) forming fi ber-acicular bundles parallel to each other.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:plutonic · volcanic · XRD

Abstract

Three different types of hydrothermal alterations have occurred in the Eocene magmatics of the northern part of Sivas-Turkey which include propylitic phyllic / sericitic and argillic. Hydrothermal alteration affected both Karataş volcanites and Kösedağ syenite. The clay formations are concentrated in two major zones; extending in NE-SW direction and intersecting both plutonic and volcanic rocks with circular opening cracks within the volcanics parallel to the plutonic-volcanic contact. Hypogene and supergene hydrothermal alteration products occurring on surface and/or near surface conditions represent the primary and secondary minerals that develop directly and mostly from feldspars with the mechanisms of neoformation and/or degradation. The hypogene minerals are formed in two stages of early (kaolinite, pyrophyllite, illite, I-S (illite-smectite), smectite, quartz and opal-CT) and late (barite, ore minerals, alunite, goyazite, jarosite, chlorite and C-S). Tourmaline, epidote and carbonates (calcite, dolomite, azurite and malachite) are considered as metasomatic and supergeneous minerals, respectively. The most common mineral paragenesis are kaolinite + quartz + goethite + goyazite or alunite, kaolinite + quartz + jarosite + feldspar ± goethite and/or goyazite in the argillic alteration zone, I-S + quartz + jarosite ± goethite ± feldspar as well as I-S + quartz + feldspar minerals in the sericitic alteration zone. Kaolinite (T) is mostly in the form of pseudohexagonal platies, I-S (R1, R3 as argillic alteration origins, 1Md, 2M1, 1M and R3 as sericitic alteration origins) forming fi ber-acicular bundles parallel to each other.

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Cite This Article

Başıbüyük, Z., Yalçın, H. (2019). Mineralogy, petrography and origin of hydrothermal alteration in Eocene magmatites in Central Anatolia (Sivas-Turkey). Maden Tetkik ve Arama Dergisi, Cilt: 158 Sayı: 158, 141–164. https://doi.org/10.19111/bulletinofmre.461255

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