Lake Hovsgol [51o00'00"N, 100o30'00"E], located to the southeast of Lake Baikal is the second largest clear water lake in the East Asia. This is a part of the Hovsgol Drilling Project(HDP) to study and document the paleoenvironment and climate in the Asian continental interior. For the high resolution study of environmental changes, the sedimentary core GC-2-2(HDP-04) was drilled at a deep part of the lake (50o57'18.4" N, 100o21'32.7" E) in March 2004. We have collected 19 bulk sediment samples, each with a stratigraphic thickness of ca. 1 cm and weights of ca 2 gr, from the 57 cm long core for the AMS radiocarbon dating. The result of our AMS dates shows that the core, undisturbed and stratigraphically very stable, shows a deposition rate of ca 3.73 cm/ka. The bottom date converges at ca 20 ka suggesting that the lower unit of the core was deposited during the Last Glacial Maximum and matches well with some previous works.[1,2,3] Also in this paper other environmental proxy data obtained from the present core will be discussed.
1] Fedotov, A.P. et al., Changes in the volume and salinity of Lake Khubsugul (Mongolia) in response to global climate changes in the upper Pleistocene and the Holocene, Paleogeography, Paleoclimatology, Paleoecology 209, 245-257.
2] Karabanov, E. et al., Ecological collapse of Lake Baikal and Lake Hovsgol ecosystems during the Last Glacial and consequences for aquatic species diversity. Paleogeography, Paleoclimatology, Paleoecology, 209, 227-243.
3] Prokopenko, A.A. et al., Basin-wide sedimentation changes and deglacial lake-level rise in the Hovsgol basin, NW Mongolia. Quaternary International 136, 59-69.
See more of Poster Session II
See more of The 10th International Conference on Accelerator Mass Spectrometry (September 5-10, 2005)