ORBITAL SIGNALS FOUND IN PHYSICAL AND CHEMICAL-PROPERTIES OF BOTTOM SEDIMENTS FROM LAKE BAIKAL

Physical and chemical properties of two 100 m sediment cores (BDP-93-1 , 93-2) obtained from the Buguldeika saddle of Lake Baikal in the east ern Siberia and a C-14-based age scale for the core show that the core bottom is about 400 000 years ago and that the changes in the sedimen tological environment of the area during the interval were that compar atively coarse and high C/N ratio sediments accumulated in the lake du ring interglacial periods, and fine material and low C/N ratio during glacial periods. The tentative age scale suggests that the first excur sion in the earth's magnetic field at about 26 m (BDP-93-1 and 93-2) f rom the sediment surface corresponds to the Blake event. Statistical a nalyses of the data-sets for the some properties show that the fluctua tions have distinct periods; 20 000 years, 40 000 years and 100 000 ye ars, that are related to the Milankovitch parameters and support that the tentative age scale is approximately acceptable.