Abstract
The relationship between cyclic processes in the core and lithosphere in the Middle Jurassic–Paleogene (167–22 Ma) was investigated. The dynamics of cyclic processes was associated with paleointensity behavior and sea level. It is shown that variations in paleointensity and ocean level are two broadband oscillatory processes. The characteristic times of variations in geomagnetic and eustatic processes changed in different geologic ages. We discovered synchronization of variations in geomagnetic and eustatic processes that occurred in the Cretaceous–Early Paleogene (125–40 Ma) based on a spectral analysis of paleointensity and sea level data. The characteristic times of coherent variations in paleointensity and global ocean level ranged from 1 to 16 Ma. Possible reasons for the synchronization of geomagnetic and lithospheric processes have been identified. Features of geomagnetic and lithospheric processes in the interval of 125–40 Ma, expressed as sharp increases in the amplitudes of paleointensity variations and activation of magmatic effusive processes, are considered.
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