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Journals / Fırat Üniversitesi Mühendislik Bilimleri Dergisi / 2026 / Cilt: 38 Sayı: 2

Interpretation of Larger Benthic Foraminifera of the Alatarla Village Sequence of the Kırkgeçit Formation Using Stable Isotope Data, Elazığ, Türkiye

Kırkgeçit Formasyonu’nun Alatarla Köyü İstifinin İri Bentik Foraminiferlerinin Duraylı İzotop Verileriyle Yorumlanması, Elazığ, Türkiye

Sibel Kayğılı(FIRAT ÜNİVERSİTESİ)0000-0002-7124-1501
Ercan Aksoy(FIRAT ÜNİVERSİTESİ)0000-0001-5078-7217
Muhammed El Ömer(FIRAT ÜNİVERSİTESİ)0009-0008-2337-7501
Pages
755–764
Publication Date
2026-09-30
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AI Summary & Key Takeaways

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

Based on the larger benthic foraminifera content and stable isotope analysis findings, it has been assessed that the unit was deposited in a shallow and warm environment.

📌 3 Key Takeaways

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Objective & Hypothesis:This study was conducted on the outcropping of the Kırkgeçit Formation in Alatarla village, located approximately 21 km northwest of Elazığ city center.
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Key Findings & Data:In thin sections prepared from samples taken along two measured stratigraphic sections named Alatarla 1 and Alatarla 2 determined larger benthic foraminifera such as Sphaerogypsina globulus, Asterigerina rotula, Gyroidinella magna, Halkyardia minima, Fabiania cassis, Chapmanina gassinensis, Silvestrella tetraedra, Nummulites sp., Assilina sp., Heterostegina sp., Operculina sp., Alveolina sp., Gypsina sp., and orthophragminid.
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Conclusion & Impact:Based on the larger benthic foraminifera content and stable isotope analysis findings, it has been assessed that the unit was deposited in a shallow and warm environment.
🔬Design:Experimental Field Trial
📍Scope:Comprehensive Sample
⚙️Variables:İri bentik foraminifer · Kırkgeçit Formasyonu · Elazığ

Abstract

This study was conducted on the outcropping of the Kırkgeçit Formation in Alatarla village, located approximately 21 km northwest of Elazığ city center. In thin sections prepared from samples taken along two measured stratigraphic sections named Alatarla 1 and Alatarla 2 determined larger benthic foraminifera such as Sphaerogypsina globulus, Asterigerina rotula, Gyroidinella magna, Halkyardia minima, Fabiania cassis, Chapmanina gassinensis, Silvestrella tetraedra, Nummulites sp., Assilina sp., Heterostegina sp., Operculina sp., Alveolina sp., Gypsina sp., and orthophragminid. Based on the larger benthic foraminifera identified, the unit has been dated to late Bartonian-early Priabonian. Stable isotope analyses (δ13C and δ18O) were performed on 13 benthic foraminifera and 2 rock samples. According to these analysis results, δ13C values ranged from 0,35 to 2,60, while δ18O values ranged from -1,79 to -3,76. Based on δ18O values, the paleotemperature ranges between 18-27 °C, and the average temperature is calculated as 21,69°C. The decrease in δ18O values indicates that the environment is becoming shallower and the paleotemperature is increasing. Low 13C values indicate high nutrient uptake. When stable isotope values in rock samples and loose samples were compared, the presence of diagenesis effects was determined in the rock samples; therefore, these values were not taken into account in the calculations. Based on the larger benthic foraminifera content and stable isotope analysis findings, it has been assessed that the unit was deposited in a shallow and warm environment.

Özet

Bu çalışma Kırkgeçit Formasyonu’nun Elazığ il merkezinin yaklaşık 21 km kuzeybatısında yer alan Alatarla köyündeki yüzeylemesinde gerçekleştirilmiştir. Alatarla 1 ve Alatarla 2 olarak adlandırılan iki ölçülü stratigrafik kesit boyunca alınan örneklerden hazırlanan ince kesitlerde Sphaerogypsina globulus, Asterigerina rotula, Gyroidinella magna, Halkyardia minima, Fabiania cassis, Chapmanina gassinensis, Silvestrella tetraedra, Nummulites sp., Assilina sp., Heterostegina sp., Operculina sp., Alveolina sp., Gypsina sp. ve orthophragminid gibi iri bentik foraminiferler tayin edilmiştir. Belirlenen bu iri bentik foraminiferlere göre birime geç Bartoniyen-erken Priyaboniyen yaşı verilmiştir. 13 bentik foraminifer kavkısı ve 2 kayaç örneğinden duraylı izotop analizleri (&13C ve &18O) yaptırılmış olup bu analiz sonuçlarına göre δ13C değerleri 0,35 ile 2,60 arasında iken, δ18O değerleri ise -1,79 ile -3,76 arasındadır. δ18O değerleri esas alınarak paleosıcaklık değeri 18-27 0C arasında değişmekte olup ortalama sıcaklık 21,69 0C olarak hesaplanmıştır. δ18O değerlerindeki azalış ortamın sığlaştığını ve paleosıcaklık değerinin arttığını göstermektedir. Düşük 13C değerleri yüksek besin gelimini işaret etmektedir. Kayaç örnekleri ile tane örneklerindeki duraylı izotop değerleri kıyaslandığında, kayaç örneklerindeki değerlerde diyajenez etkisinin varlığı belirlendiğinden, hesaplamalarda bu değerler dikkate alınmamıştır. İri bentik foraminifer içeriği ve duraylı izotop analiz bulguları esas alınarak birimin sığ ve sıcak bir ortamda çökeldiği değerlendirilmiştir.

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Cite This Article

Kayğılı, S., Aksoy, E., Ömer, M. E. (2026). Interpretation of Larger Benthic Foraminifera of the Alatarla Village Sequence of the Kırkgeçit Formation Using Stable Isotope Data, Elazığ, Türkiye. Fırat Üniversitesi Mühendislik Bilimleri Dergisi, Cilt: 38 Sayı: 2, 755–764. https://doi.org/10.35234/fumbd.1880072

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