Lake Baikal (Russia) and Lake Hovsgol (Mongolia) are ancient large freshwater lakes in East Eurasia, and Lake Erhel is a saline lake (S = ∼20‰) in Mongolia. Radiocarbon ages of the lake sediments were measured by Tandetron accelerator mass spectrometer at the Center for Chronological Research, Nagoya University. The linear sedimentation rate for the VER99G12 sediment core from Lake Baikal is estimated to be 18.2 cm/kyr, based on the conventional 14C ages. 14C measurements of the Lake Hovsgol sediment cores (HDP04) show that the sediment layers from 0 to 2 m depth (Core1-1) were disturbed during core sampling. The sediment layers below 2 m depth for HDP04 cores are available from past-environmental and biological investigations. The linear sedimentation rates of Lake Erhel sediment core (Erhel Core2) are 5.2 cm/kyr for cool periods (∼24-11 kyr BP) and 9.1-36.6 cm/kyr for warm periods (∼11-3 kyr BP). An abrupt increase of sedimentation rate about 11 kyr BP (from 5.2 to 31.0 cm/kyr) could be caused by climate humidification with warming.
|ジャーナル||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|出版ステータス||Published - 2007 6月|
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