Abstract
This chapter presents two paleomagnetic and rock–magnetic studies conducted on two sedimentary cores, BDP96-1 and BDP96-2, drilled at the Academician Ridge of Lake Baikal. The comparison of the paleomagnetic inclination records with the geomagnetic polarity time scale showed that the sedimentary sequence covers the age of the past 5 million years. The study is conducted on discrete samples and on quarter-core samples. Path-through measurement of the quarter core samples revealed detailed geomagnetic variation, such as the double polarity transitions around the B/M boundary. The average sedimentation rate from the depth-age relation is estimated to be 3.8 cm/kyr, with a correlation coefficient of 0.997–0.999. This high correlation suggests that the sedimentation at Academician Ridge during the past 5 million years is continuous in a quiet environment. Magnetic susceptibility is closely related to changes in the content of biogenic silica and shows a clear correlation with glacial–interglacial change. Susceptibility measurement is relatively quick and nondestructive, making it a valuable means of paleoclimatic study of Lake Baikal sediment, however, further study of the mechanism of the susceptibility changes in Lake Baikal associated with paleoclimate are needed.
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