Tuncay ERCAN, Gianni BIGAZZI, Zehra YEĞİNGİL, Mustafa ÖZDOĞAN, Michel ODDONE

Age determination of obsidian bearing volcanics in Eastern Anatolia using the fission track dating method

Doğu Anadolu'daki bir çok volkanik bölgedeki obsidiyen örnekleri "fizyon track" (FT) yöntemiyle yaşlandırılmıştır. Bu çalışmada, volkanikleri gösteren jeoloji haritaları toplanıp derlenmiştir. Bu haritalar, FT yaşlarındaki gibi |0.03 Ma'dan 6.09 Ma'ya kadar) Doğu Anadolu'daki obsidiyen içeren volkaniklerin anlaşılmasında net bir destek sunarlar. Daha önceki yayımlanmış ölçümlerle birlikte genç zamanlar (1 Ma), Van Gölü'nün batı ve kuzey kıyıları boyunca yer alan Pleistosen volkanlarının üzerinde belirtilmiştir. Obsidyenler, Üst Miyosen-Pliyosen yaşlı NE (Kars)'den S W (Bingöl) doğrultusunda uzanan düzgün bir yay boyunca dağılmışlardır. Sonraki patlamalar için daha önce belirtilmiş sadece iki K-Ar yaşı vardır; bunlardan çoğu çok yakın zamanda onaylanmıştır.

Doğu Anadolu'daki obsidiyen içeren volkaniklerin "fizyon track" yöntemiyle yaş tayini

Obsidian samples from several volcanic fields located in eastern Anatolia (namely: Nemrut Dağı, Süphan Dağı, Meydan Dağı, Kars, Erzurum, Pasinler, Sarıkamış, Muş, Bingöl), have been dated by the fission track (FT) method. Geological maps showing the volcanics studied in this work have also been compiled. These maps as well as the FT ages shown in this work (from 0.03 Ma up to 6.9 Ma), represent a solid contribution towards the understanding of the obsidian bearing volcanics of eastern Anatolia. Young dates (< 1 Ma), in agreement with published measurements, were determined on the west and north coasts of Lake Van. Obsidians distributed along an ideal arc extending from NE (Kars) to SW (Bingöl) gave Upper Miocene-Pliocene ages. Two previous K-Ar ages only were available for the latter outcrops; several of them were only very recently recognised.

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