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

Year 2025, Volume: 25 Issue: 5, 1202 - 1215, 01.10.2025

Asuman Kahya , Metin Bağci

https://doi.org/10.35414/akufemubid.1599840

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.

Keywords

Geochemistry , Lower-Middle Eocene , fossilliferous limestone , paleo-redox condition , Yağlıca village , Türkye

Project Number

-

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

Abstract

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.

Keywords

jeokmya , Alt-Orta Eosen , fosilli kireçtaşı , paleoredoks koşulları , Yağlıca köyü , Aflani , Türkiye

Ethical Statement

Herhangibir çıkar çatışması yoktur.

Supporting Institution

-

Project Number

-

Thanks

MTA Genel Müdürlüğü

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