Deep-sea hiatus record reveals orbital pacing by 2.4 Myr eccentricity grand cycles.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38472187.
- Also identified by DOI 10.1038/s41467-024-46171-5 and PMC identifier 10933315.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Astronomical forcing of Earth's climate is embedded in the rhythms of stratigraphic records, most famously as short-period (10<sup>4</sup>-10<sup>5</sup> year) Milankovitch cycles. Astronomical grand cycles with periods of millions of years also modulate climate variability but have been detected in relatively few proxy records. Here, we apply spectral analysis to a dataset of Cenozoic deep-sea hiatuses to reveal a ~2.4 Myr eccentricity signal, disrupted by episodes of major tectonic forcing. We propose that maxima in the hiatus cycles correspond to orbitally-forced intensification of deep-water circulation and erosive bottom current activity, linked to eccentricity maxima and peaks in insolation and seasonality. A prominent episode of cyclicity disturbance coincides with the Paleocene-Eocene Thermal Maximum (PETM) at ~56 Myr ago, and correlates with a chaotic orbital transition in the Solar System evident in several astronomical solutions. This hints at a potential intriguing coupling between the PETM and Solar System chaos.