Kuzeydoğu Anadolu’da Küçük Buzul Çağı’nın Sonu: Aygır Gölü Sedimanlarının Çoklu Proksi Paleo-Limnolojik İncelemesi (Kars, KD Anadolu)

Öz

Aygır Gölü’nden (KD Anadolu) alınan sediman karotunun (AY karotu) sedimantolojik, jeokimyasal ve duraylı izotop analizleri son ~500 yıldaki iklim değişikliklerin kanıtlarını ortaya koymaktadır. Siltli kilden oluşan Aygır Gölü sedimanlarının modellenen sedimantasyon hızı ~0,16 cm/yıldır. Detritik olarak çökelmiş proksi elementlerin tabandan yüzeye dağılımına göre yapılan çoklu proksi analizlerine göre, toplam kalsiyum karbonat, organik karbon ve duraylı izotop verileri Küçük Buzul Çağı’ndan (KBÇ; 1350-1850 MS) Endüstriyel Dönem’e (ED, 18-19 yy) geçişi temsil eder ve bu dönem düşük ayrışma hızı ve kurak koşulları açıklayacak şekilde toplam organik karbon, Ca, Sr değerlerindeki düşüşle temsil edilir. Karotun üst kısımları ise (192 yıl öncesinden günümüze) kırıntılardaki artış ve yüksek Fe, Ti, K, Rb ve Zr konsantrasyonları yanı sıra yüksek δ¹⁸O ve δ¹³C değerleri ile temsil edilir ve Endüstri Çağı’nın sıcak koşullarını açıklar.

Anahtar Kelimeler

• Aygır Gölü
• Duraylı izotop
• Kuzeydoğu Anadolu
• Paleoiklim
• Sediman karotu

Termination of Little Ice Age in Northeastern Anatolia: A Multi-proxy Paleolimnology Study of Lake Aygır Sediments, (Kars, NE Anatolia)

Öz

Sedimentary, geochemical and stable isotope analyses of a sediment core (core AY) recovered from Lake Aygır (NE Anatolia) provide evidence of the climatic shifts during the last ~500 yrs. Sediments in Lake Aygırare composed of silty clay with a modeled ~0.16 cm/yr sedimentation rate. Multi-proxy analyses of the downcore distribution of detritally-deposited proxy elements, total calcium carbonate, organic carbon and stable isotopes reveal climatic records of the Industrial Epoch (IE; 18th-19th centuries) and the termination of the Little Ice Age (LIA; AD 1350 to 1850), represented by fluctuating Total Organic Carbon (TOC), Ca, Sr and relatively low detrital precursors (Fe, Ti, K, Rb, Zr), indicating low chemical weathering and dry conditions. The upper part of the core (192 cal yrs BP to present), identified with high detrital input, contains an increasing trend of Fe, Ti, K, Rb, and Zr together with high δ¹⁸O and δ¹³C values, indicating warmer conditions during the IE.

Anahtar Kelimeler

• Sediment coring
• Stable isotope
• Lake Aygır
• NE Anatolia
• Paleoclimate.

Kaynakça

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