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OSL, IRSL and radiocarbon chronology of Late Olgoi sediments, Mongolia, and implication to the glacier retreat events in Khangai mountain range

Igarashi, Yudai*; Udaanjargal, U.*; Kokubu, Yoko   ; Fujita, Natsuko  ; Hasegawa, Hitoshi*; Niiden, I.*; Katsuta, Nagayoshi*; Davaadorj, D.*; Hasebe, Noriko*

Lake Olgoy locates in the "Valley of the Gobi lakes" in southern Mongolia, on the southern slope of Khangai Mountain range. The 10.5m core was collected from Lake Olgoy in the winter of 2017. This study measured quartz OSL, feldspar IRSL and radiocarbon ages. Quartz OSL ages range in 0.6$$pm$$0.1 ka to 10.7$$pm$$2.5 ka, feldspar IRSL in 1.1$$pm$$0.1 ka to 52.9$$pm$$5.0 ka and radiocarbon ages in 1.4 ka to 48.6 ka. Based on the comparison of ages by three methods, the age-depth model of the core was proposed. Together with other analytical data from the core, glacier melting events in Khangai Mountains will be discussed.

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