Long period astronomical cycles from the Triassic to Jurassic bedded chert sequence (Inuyama, Japan); Geologic evidences for the chaotic behavior of solar planets

Astronomical theory predicts that similar to 2 Myr eccentricity cycle have changed its periodicity and amplitude through time because of the chaotic behavior of solar planets, especially Earth-Mars secular resonance. Although the similar to 2 Myr eccentricity cycle has been occasionally recognized in geological records, their frequency transitions have never been reported. To explore the frequency evolution of similar to 2 Myr eccentricity cycle, we used the bedded chert sequence in Inuyama, Japan, of which rhythms were proven to be of astronomical origin, covering the similar to 30 Myr long spanning from the Triassic to Jurassic. The frequency modulation of similar to 2 Myr cycle between similar to 1.6 and similar to 1.8 Myr periodicity detected from wavelet analysis of chert bed thickness variation are the first geologic record of chaotic transition of Earth-Mars secular resonance. The frequency modulation of similar to 2 Myr cycle will provide new constraints for the orbital models. Additionally, similar to 8 Myr cycle detected as chert bed thickness variation and its amplitude modulation of similar to 2 Myr cycle may be related to the amplitude modulation of similar to 2 Myr eccentricity cycle through non-linear process(es) of Earth system dynamics, suggesting possible impact of the chaotic behavior of Solar planets on climate change.