Alt Kretase çamurtaşlarında organik madde birikimini kontrol eden paleoortamsal faktörler: Karabük bölgesi (Batı Pontidler)

Yıl 2026, Cilt: 15, 1 - 18, 15.01.2026

Zeynep Doner

https://doi.org/10.28948/ngumuh.1816402

https://izlik.org/JA38XA64PP

Öz

Alt Kretase dönemi, küresel ölçekte önemli petrol ve doğal gaz rezervlerinin oluştuğu ve kaynak kaya gelişiminin yaygın olduğu bir dönemdir. Bu çalışmanın amacı, Batı Pontidler’de Çukurca-Karabük bölgesi civarında yüzeyleyen alt Kretase yaşlı organik madde içeren çamurtaşlarında organik madde birikimini kontrol eden çökelme ortamı koşullarını ortaya koymaktadır. Çalışmada köken-tektonik ortam, paleoiklim, paleotuzluluk, detritik girdi, sedimantasyon hızı, paleoüretkenlik ve paleoredoks koşulları değerlendirilmiştir. Bulgular, çamurtaşlarının acı su–tuzlu denizel koşulların egemen olduğu sığ kenar havza–şelf geçiş zonunda çökelmiş olduğunu göstermektedir. Çökelmede yarı nemli–yarı kurak iklim koşulları ve orta dereceli kimyasal ayrışma etkili olmuştur. Paleoiklim ve değişken paleoüretkenlik faktörlerinin organik madde birikiminde birincil bir rol oynamadığı, oksik–suboksik redoks koşulları altında gelişen epizodik oksijen eksikliğinin organik madde korunmasına katkı sağladığı belirlenmiştir. Sedimantasyon hızındaki dalgalanmalar organik maddeyi hem seyreltmiş hem de oksidatif bozunmayı artırmıştır. Bununla birlikte, organik madde ve iz elementlerin birikimini kontrol eden baskın mekanizmaların tanımlanması, farklı oşinografik süreçlerin eşzamanlı ve karmaşık etkileşimi nedeniyle güçlüğünü korumaktadır.

Anahtar Kelimeler

Alt Kretase çamurtaşları , Organik madde zenginleşmesi , İz elementler , Paleoortam , Karabük bölgesi (Batı Pontidler)

Paleoenvironmental controls on organic matter accumulation in Lower Cretaceous mudstones: Karabük area (Western Pontides)

https://izlik.org/JA38XA64PP

Öz

The lower Cretaceous period marks a global interval of extensive source rock development and significant oil-natural gas accumulation. The aim of this study is to reveal the depositional controls on organic matter enrichment in lower Cretaceous organic-bearing mudstones exposed around the Çukurca–Karabük area (western Pontides). In this study, origin, tectonic setting, paleoclimate, paleosalinity, detrital input, sedimentation rate, paleoproductivity, and paleoredox conditions were assessed. The findings indicate that the mudstones were deposited in the shallow marginal basin-shelf transition zone where brackish-saltwater marine conditions dominated. Semi-humid-semi-arid climate conditions and moderate chemical weathering were effective in deposition. It has been determined that paleoclimate and variable paleoproductivity factors do not play a primary role in organic matter accumulation, episodic oxygen deficiency developing under oxic–suboxic redox conditions contributes to the preservation of organic matter. Fluctuations in sedimentation rate both diluted the organic matter and increased oxidative degradation. However, identifying the dominant mechanisms controlling the organic matter accumulation and trace elements remains challenging due to the simultaneous and complex interaction of different oceanographic processes.

Anahtar Kelimeler

Lower Cretaceous mudstones , Organic matter enrichments , Trace elements , Paleoenvironment , Karabük area (Western Pontides)

Teşekkür

The author thanks the Istanbul Technical University (ITU) Geochemistry Research Laboratories (ITU/JAL) team for their valuable contributions to the geochemical analyses.

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