[MIS19-P14] Paleoenvironmental changes recorded in Orog Lake, southwestern Mongolia during MIS 3 and its relationship with Homo sapiens’s migration into northern Asia
Keywords:Lake sediments, Saline lake, Paleoenvironmental changes, Dansgaad event, Homo sapiens, Initial and Early Upper Paleolithic
In this paper, we present a new record of paleoenvironmental changes in southwestern Mongolia during MIS 3. In January 2017, we took two parallel cores (OROG01, 24 m; OROG02, 21 m) from Orog Lake, a shallow saline lake located in northwestern margin of Gobi Desert. The high-resolution major and minor element composition changes were obtained using μXRF core scanner (Cox, Itrax) at Center for Advanced Marine Core Research, Kochi University. Based on the preliminary results of OSL and 14C age dating, basal age of sediment core OROG01 yielded ca. 38 ±4 ka, nearly accordant with the basal age of ~45 ka reported in the previous study (Yu et al., 2019). On the basis of our high-resolution elemental composition data, in conjunction with previous sedimentological and palynological data (Yu et al., 2019), the paleoenvironments of southwestern Mongolia were more humid with higher lake levels during MIS 3 than Holocene. Our results also suggest periodic and higher amplitude paleoenvironmental changes in this region, which likely correspond to Dansgaard-Oeschger events. This new record would allow us to discuss potential relationship between paleoenvironmental changes and ecosystem changes in Mongolia during the IUP-EUP.