Sediment dynamics in the Eurasian Arctic Ocean during the last deglaciation : The clay mineral group smectite perspective

摘要: Abstract This study focuses on sedimentological investigations of sediment cores recovered during the international Arctic′91, expeditions with German research ice breaker RV “Polarstern” to European sector Arctic Ocean. Here, we deduce last glacial/interglacial changes in transport mechanism and sedimentation from clay mineral group smectite. We choose smectites as an example how mineralogy can be linked particular source regions (the Kara Laptev seas), distinct (sea surface currents) processes. Smectite contents sediments discussed for two time slices, including Last Glacial Maximum (LGM), deglaciation (Termination I), reveal highest variability subsequent retreat Eurasian sheets. Our results show that smectite anomalies Basin are associated meltwater pulses occurred around 13.5–13.0 14C ka B.P. Compelling evidence is provided these deduced sea-ice entrained eastern Sea entered Ocean after ice-sheet break-up eventually flooding Sea. propose utilized identify deglacial events help decipher configurations The identification maxima along modern edge further indicates biologically enhanced melting sea allowing reconstruction seasonally open water region. Hence, considering poor preservation conditions primary paleoceanographic proxies Ocean, contents, particularly group, may one alternative tool paleoclimatic Basin.