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.
Fig. 1. The g4-g3 Mars–Earth “grand eccentricity” cycle, 0 to 250 Ma (from Fig. 6 in Fang et al., 2025). Blue and black curves: La2010d (blue) and La2004 (black) solar system solutions are compared with selected cyclostratigraphy. a: Continental Jurassic (193-175 Ma) Sangonghe Formation (China) (Fang et al., 2025). b: Marine Jurassic (202-193 Ma) Mochras Farm (Wales) (Storm et al., 2020). c: Continental Triassic (225-202 Ma) Newark-Hartford (USA)(Olsen et al., 2019). d: Marine middle Eocene (43-39 Ma) ODP U1408-U1410 (North Atlantic) (De Vleeschouwer et al., 2023). e: The Neogene.
References
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