Erçek Gölü’nün Holosen Palinolojisi ve Polene Dayalı Paleoiklim Yapılandırması (Doğu Anadolu, Türkiye); Kısa Dönem İklim Salınımları ve Global Paleoiklim Değişimleri ile İlişkisi; E1 ve E10 Karotlarının Sonuçları

Öz

Bu çalışma Erçek Gölü’nün (Doğu Anadolu, Türkiye) güney kesiminden alınan E1ve E10 sediment karotlarının palinolojik ve stratigrafik incelenmesini kapsamaktadır. Karot örnekleri farklı su derinliklerinden gravite karot örnekleyici kullanılarak alınmıştır. Karot örneklerinin litolojisi çoğunlukla laminalı ritmik sediman, masif ve tabakalı seviyeler ile E10 karotunda bulunan tefra seviyesi içermekte ve göl tabanının faylı oluşundan dolayı farklı zaman aralıklarını temsil etmektedir. Karot örneklerinin yaşlandırılması Van Gölü örneklerinin polen ve tefra seviyeleriyle korelasyonuna dayandırılarak belirlenmiştir. Palinolojik inceleme sonuçlarına göre, Erçek Gölü’nün, Grönlandiyen paleovejetasyonu Amaranthaceae familyası baskın halofitik vejetasyon ve yarı kurak paleoiklim koşulları ile temsil edilmektedir. Meghaliyen katı ise Poaceae familyası baskın step vejetasyonu ve antropojenik pollenlere göre artan insan etkisi ile karakterize edilmektedir. Erçek Gölü çevresinde Meghaliyen paleoiklimi Grönlandiyen’den daha nemlidir ve günümüze doğru gelindikçe maksimum yaprak döken Quercus yayılımı ile temsil edilmektedir.

Anahtar Kelimeler

• Erçek Gölü
• Holosen
• palinoloji
• paleoiklim
• Grönlandiyen
• Meghaliyen

Holocene Palynology and Pollen-Based Palaeoclimate Reconstruction of Lake Erçek (Eastern Anatolia); Short-Term Climatic Fluctuations and their Relation with Global Palaeoclimatic Change; Results of Cores E1 and E10

Öz

This study is a palynological and stratigraphical investigation of E1 and E10 core samples from the southern part of Lake Erçek (Eastern Anatolia, Turkey). Core samples were taken by a gravity corer from different water depths. Deposits in the core samples include mostly laminated rhythmic sediments, massive and graded layers and a tephra layer from E10 core, representing different time spans because of the faulted ground of the lake. Tentative time scales of the core samples are based on pollen and tephra correlation with Lake Van deposits. According to the palynological investigations, palaeovegetation of Greenlandian is represented by Amaranthaceae-dominant halophytic vegetation and semi-arid palaeoclimate conditions based on pollen analysis around Lake Erçek. The Meghalayan stage is mainly characterized by Poaceae-dominated steppe vegetation and increasing human impact according to anthropogenic pollen indicators. The Meghalayan palaeoclimate of Lake Erçek was more humid than Greenlandian and is represented by maximum deciduous Quercus expansion in recent times around the Lake Erçek area.

Anahtar Kelimeler

• Holocene
• Greenlandian
• Lake Erçek
• Meghalayan
• palynology
• palaeoclimate

Kaynakça

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