Home – Home – Jornals – Russian Geology and Geophysics 2001 number 1-2

An attempt is made to study the cyclicity (periodicity) of the Earth's evolution processes, which may be expressed in the structure and state of geological section. A particular purpose of this work was to reveal periodical changes in the environment and climate of Central Asia by analyzing the logs obtained from the boreholes drilled in the Baikal bottom sediments (International Baikal Drilling Project). A basic method for revealing the cyclic structure of the signal was the body of wavelet analysis. The obtained analytical data correspond to the known periods recognized by M. Milankovitch and suggest that the Central Asian climate varied to show cycles of 13-14, 16-27, 35-57, and 75-120 ka.