Solar System chaos and the Paleocene-Eocene boundary age constrained by geology and astronomy.

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ID: 28188
2019
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Abstract
Astronomical calculations reveal the Solar System's dynamical evolution, including its chaoticity, and represent the backbone of cyclostratigraphy and astrochronology. An absolute, fully calibrated astronomical time scale has hitherto been hampered beyond ~50 million years before the present (Ma) because orbital calculations disagree before that age. Here, we present geologic data and a new astronomical solution (ZB18a) showing exceptional agreement from ~58 to 53 Ma. We provide a new absolute astrochronology up to 58 Ma and a new Paleocene-Eocene boundary age (56.01 ± 0.05 Ma). We show that the Paleocene-Eocene Thermal Maximum (PETM) onset occurred near a 405-thousand-year (kyr) eccentricity maximum, suggesting an orbital trigger. We also provide an independent PETM duration (170 ± 30 kyr) from onset to recovery inflection. Our astronomical solution requires a chaotic resonance transition at ~50 Ma in the Solar System's fundamental frequencies.
Reference Key
zeebe2019solarscience Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zeebe, Richard E;Lourens, Lucas J;
Journal Science
Year 2019
DOI
10.1126/science.aax0612
URL
Keywords Keywords not found

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