11:15 AM - 11:30 AM
[HGM04-08] Paleo Lake level change in southern part of Mongolia
Keywords:Lake level change, OSL dating, Mongolia, Holocene
The history of lake level change is proposed based on the age, altitude of the localities, and sedimentary structure of the outcrops. Data from Boontsagaan lake, for which coarse grains were analysed, scatter, therefore the youngest age component is extracted by plotting the data on the radial plot (Galbraith, 1988, Vermeesch, 2009). Ages from Boontsagaan Lake are around ~4-9 ka, while ages from Olgoy and Orog lakes are around ~1-2 ka. Because Boontsagaan Lake is larger and deeper than other lakes, its lake level change would be less active. Besides, relative height of the locality to the current lake level is higher then other two lakes. Therefore, the lake level was very high before ~5 ka, and relatively high at ~1-2 ka. The obtained results are consistent with previously reported data from the nearby sites (Lehmkuhl et al., 2018).