Highlight-7

Highlight 7: Evolution of the g4-g3 Mars–Earth “grand eccentricity” cycle, 0-250 Ma

The Mars-Earth “grand eccentricity” cycle frequency g4-g3 for La2004 and La2010d was estimated by frequency analysis of 20-Myr-long sliding windows along the two eccentricity solutions (Fig. 1). Some data show agreement with these solutions (b and c) but also considerable mismatches (a and d). Plans are underway to produce a continuous data-derived g4-g3 curve, and similar model-data curves for the s4-s3 Mars-Earth “grand inclination” cycle. Together these curves will provide the long-sought empirical evidence for Mars–Earth eccentricity-inclination (g4-g3 : s4-s3) secular resonance evolution from the Precambrian to present.

References

De Vleeschouwer et al., 2023, North Atlantic drift sediments constrain Eocene tidal dissipation and the evolution of the Earth-Moon system. Paleoceanography and Paleoclimatology, 38, e2022PA004555, https://doi.org/10.1029/2022PA004555

Fang, Y., Olsen, P.E., Sha, J., Whiteside, J.H., Cuan, C., Ikeda, M., Zheng, D., Zhang, H., Wang, B., 2025, Jurassic constraints on the chaotic Mars–Earth eccentricity cycle linked to the volcanically induced Jenkyns event, Proceedings of the National Academy of Sciences USA,  122, 27, e2419902122, https://doi.org/10.1073/pnas.2419902122

Olsen, P.E., Laskar, J., Kent, D.V., Kinney, S.T., Reynolds, D.J., Sha, J., Whiteside, J.H., 2019, Mapping Solar System chaos with the Geological Orrery. Proceedings of the National Academy of Sciences, 116 (22) 10664-10673, https://doi.org/10.1073/pnas.1813901116

Storm, M.S., et al., 2020, Orbital pacing and secular evolution of the Early Jurassic carbon cycle. Proceedings of the National Academy of Sciences USA, 117, 3974–3982, https://doi.org/10.1073/pnas.1912094117