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X-ray fluorescent analysis

Bottom sediments of the Lake Karakyol reveal a 2000-year climate variability in the Western Caucasus


  • Mr. Mikhail ALEXANDRIN

Primary authors



Two sediment cores were retrieved from the Lake Karakyol (Teberda, Western Caucasus) during the field expeditions of 2010 and 2014. The cores (depths 20-85 cm and 0-60 cm, respectively) were combined to create a joint master-chronology using the results of high-resolution scanning SR XRF analysis carried out within the facilities of BINP SB RAS. In addition, traditional sedimentary analyses (loss-on-ignition, grain size, magnetic susceptibility) were performed at an increment of 1-2 cm. The chronology was constrained by the eight 14C AMS dates that ensured a reliable age-depth relation for the last 2000 years. The results witness several distinctive warm and cold periods in the Caucasus during the last two millennia and help to constrain regional timeframes of such events as the Medieval Warm Period and the Little Ice age. The research funded by the RFBR grant # 17-35-50134