Jurassic constraints on the chaotic Mars-Earth eccentricity cycle linked to the volcanically induced Jenkyns event.

ABSTRACT: Solar system gravitational interactions are embedded in Earth's record of climate, providing a way to bypass the 60 Myr limit imposed by chaos. Presently with a 2.4 Myr period, the Mars-Earth beat cycle of orbital perihelion frequencies is particularly sensitive to chaotic diffusion, potentially varying by more than a million years. Early Mesozoic (252 to 145 Ma) strata provide some constraints on this cycle, with evidence of a swing through most of the solution space from 1.8 Myr at 210 Ma to 2.5 Myr at 190 Ma and back to 1.6 Myr at 180 Ma. However, only the 1.8 Myr cycle is corroborated by geochronologic data and the 1.6 Myr period is disputed. Here, we show that variations in land-plant-dominated stable carbon isotopic ratios (δ¹³C_org) from the lacustrine, paleo-hi

SUBMITTER: Fang Y 

PROVIDER: S-EPMC12260395 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature