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Journals / Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi / 2026 / Cilt: 25 Sayı: 5

Geochemistry of Lower-Middle Eocene aged fossiliferous limestones in Eflani area (Karabük): Depositional Environment and Paleotemperature Characteristics

Eflani yöresi (Karabük) Alt-Orta Eosen yaşlı fosilli kireçtaşlarının Jeokimyası: Çökelme Ortamı ve Paleosıcaklık Özellikleri

Asuman Kahya(MTA Genel Müdürlüğü)0000-0002-1691-3387
Metin Bağci(AFYON KOCATEPE ÜNİVERSİTESİ, MÜHENDİSLİK FAKÜLTESİ, JEOLOJİ MÜHENDİSLİĞİ BÖLÜMÜ, JEOLOJİ MÜHENDİSLİĞİ PR.)0000-0002-1056-2854
Pages
1202–1215
Publication Date
2025-10-01
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AI Summary & Key Takeaways

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

The palaeoclimate index ∑(Fe + Mn + Cr + Ni + V + Co)/∑(Ca + Mg + Sr +Ba + K + Na) ranges from 0.087 to 0.09 indicating an arid condition during the sedimentation of the limestone.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The geochemistry of Lower-Middle Eocene fossiliferous limestone of Yağlıca village (Eflani, Karabük) was studied using major, trace elements and stable isotopes to investigate paleo redox condition, depositional environment, and paleoclimate.
📊
Key Findings & Data:Based on the average -1.85 Mn* value, it was determined that the fossiliferous limestones in the study area occurred under reducing conditions.
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Conclusion & Impact:The palaeoclimate index ∑(Fe + Mn + Cr + Ni + V + Co)/∑(Ca + Mg + Sr +Ba + K + Na) ranges from 0.087 to 0.09 indicating an arid condition during the sedimentation of the limestone.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:jeokmya · Alt-Orta Eosen · fosilli kireçtaşı

Abstract

The geochemistry of Lower-Middle Eocene fossiliferous limestone of Yağlıca village (Eflani, Karabük) was studied using major, trace elements and stable isotopes to investigate paleo redox condition, depositional environment, and paleoclimate. The fossiliferous limestones in the study area indicate an oxic condition according to the V/Cr, V/Sc, U/Th, Ni/Co ratios, and disoxide environment according to the V/(V+Ni) ratio. Based on the average -1.85 Mn* value, it was determined that the fossiliferous limestones in the study area occurred under reducing conditions. The Ce anomaly value is between 0.47 and 0.59, indicating that it precipitates from seawater under oxidizing conditions. The palaeoclimate index ∑(Fe + Mn + Cr + Ni + V + Co)/∑(Ca + Mg + Sr +Ba + K + Na) ranges from 0.087 to 0.09 indicating an arid condition during the sedimentation of the limestone.

Özet

Yağlıca köyü (Eflani, Karabük)’nde yer alan Alt-Orta Eosen yaşlı fosilli kireçtaşından oluşan Safranbolu Formasyonu’nun jeokimyası, paleoredoks koşulları, çökelme ortamı ve paleoiklim koşulları ana, eser ve iz elementler değerleri ile incelenmiştir. Çalışma alanındaki fosilli kireçtaşının V/Cr, V/Sc, U/Th, Ni/Co oranlarına göre oksik koşulları, V/(V+Ni) oranına göre disoksit ortamı ifade etmektedir. Ortalama -1.85 olan Mn* değerine göre çalışma alanındaki fosilli kireçtaşının indirgen koşullarda oluştuğu belirlenmiştir. Ce anomali değeri ise 0,47 ile 0,59 arasında değişmekte olup, oksitleyici koşullar altında deniz suyundan itibaren çökeldiğini ifade etmektedir. 0,038 ila 0,04 arasında değişen paleoiklim indeksi (∑ (Fe + Mn + Cr + Ni + V + Co)/∑ (Ca + Mg + Sr +Ba + K + Na) değerlerine göre, fosilli kireçtaşının çökelmesi sırasında ortamın kurak olduğunu belirtmektedir.

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Cite This Article

Kahya, A., Bağci, M. (2025). Geochemistry of Lower-Middle Eocene aged fossiliferous limestones in Eflani area (Karabük): Depositional Environment and Paleotemperature Characteristics. Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi, Cilt: 25 Sayı: 5, 1202–1215. https://doi.org/10.35414/akufemubid.1599840

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