Abstract
Cyclostratigraphy and astrochronology are now at the forefront of geologic timekeeping. While this technique heavily relies on the accuracy of astronomical calculations, solar system chaos limits how far back astronomical calculations can be performed with confidence. High-resolution paleoclimate records with Milankovitch imprints now allow reversing the traditional cyclostratigraphic approach: Middle Eocene drift sediments from Newfoundland Ridge are well-suited for this purpose, due to high sedimentation rates and distinct lithological cycles. Per contra, the stratigraphies of Integrated Ocean Drilling Program Sites U1408–U1410 are highly complex with several hiatuses. Here, we built a two-site composite and constructed a conservative age-depth model to provide a reliable chronology for this rhythmic, highly resolved (<1 kyr) sedimentary archive. Astronomical components (g-terms and precession constant) are extracted from proxy time-series using two different techniques, producing consistent results. We find astronomical frequencies up to 4% lower than reported in astronomical solution La04. This solution, however, was smoothed over 20-Myr intervals, and our results therefore provide constraints on g-term variability on shorter, million-year timescales. We also report first evidence that the g4–g3 “grand eccentricity cycle” may have had a 1.2-Myr period around 41 Ma, contrary to its 2.4-Myr periodicity today. Our median precession constant estimate (51.28 ± 0.56″/year) confirms earlier indicators of a relatively low rate of tidal dissipation in the Paleogene. Newfoundland Ridge drift sediments thus enable a reliable reconstruction of astronomical components at the limit of validity of current astronomical calculations, extracted from geologic data, providing a new target for the next generation of astronomical calculations.
| Original language | English |
|---|---|
| Article number | e2022PA004555 |
| Number of pages | 22 |
| Journal | Paleoceanography and Paleoclimatology |
| Volume | 38 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2023 |
Bibliographical note
Funding Information:This research used samples and data provided by the International Ocean Discovery Program (IODP) and its predecessors, a program sponsored by NSF and participating countries under the management of Joint Oceanographic Institutions. XRF core-scanning was made possible thanks to the instrumentation and support of the SIO Geological Collections at the Scripps Institution of Oceanography, University of California San Diego (managed by A. Hangsterfer). We warmly thank all shipboard and on-shore scientists that contributed to XRF core scanning in Bremen and San Diego. Financial support was provided by the National Science Foundation (NSF) to PMH (NSF Award #1335261) and JCZ (NSF Award #1334209) and the Belgian American Educational Foundation (B.A.E.F.) and the Fulbright Commission of Belgium and Luxemburg to SD. B. Erkkila, M. Wint, L. Elder and numerous students of the Yale Analytical and Stable Isotope Center, D. Andreasen of the UCSC Stable Isotope Laboratory, Megan Wilding and Bastian Hambach of the NOCS stable isotope lab, and Henning Kuhnert and the team of the MARUM isotope lab are thanked for assistance with isotopic analyses. All Bayesian Morkov Chain Monte Carlo analyses were run on the PALMA-II High Performance Computing cluster provided by the University of Münster. Open Access funding enabled and organized by Projekt DEAL.
Funding Information:
This research used samples and data provided by the International Ocean Discovery Program (IODP) and its predecessors, a program sponsored by NSF and participating countries under the management of Joint Oceanographic Institutions. XRF core‐scanning was made possible thanks to the instrumentation and support of the SIO Geological Collections at the Scripps Institution of Oceanography, University of California San Diego (managed by A. Hangsterfer). We warmly thank all shipboard and on‐shore scientists that contributed to XRF core scanning in Bremen and San Diego. Financial support was provided by the National Science Foundation (NSF) to PMH (NSF Award #1335261) and JCZ (NSF Award #1334209) and the Belgian American Educational Foundation (B.A.E.F.) and the Fulbright Commission of Belgium and Luxemburg to SD. B. Erkkila, M. Wint, L. Elder and numerous students of the Yale Analytical and Stable Isotope Center, D. Andreasen of the UCSC Stable Isotope Laboratory, Megan Wilding and Bastian Hambach of the NOCS stable isotope lab, and Henning Kuhnert and the team of the MARUM isotope lab are thanked for assistance with isotopic analyses. All Bayesian Morkov Chain Monte Carlo analyses were run on the PALMA‐II High Performance Computing cluster provided by the University of Münster. Open Access funding enabled and organized by Projekt DEAL.
Publisher Copyright:
© 2023. The Authors.
Funding
This research used samples and data provided by the International Ocean Discovery Program (IODP) and its predecessors, a program sponsored by NSF and participating countries under the management of Joint Oceanographic Institutions. XRF core-scanning was made possible thanks to the instrumentation and support of the SIO Geological Collections at the Scripps Institution of Oceanography, University of California San Diego (managed by A. Hangsterfer). We warmly thank all shipboard and on-shore scientists that contributed to XRF core scanning in Bremen and San Diego. Financial support was provided by the National Science Foundation (NSF) to PMH (NSF Award #1335261) and JCZ (NSF Award #1334209) and the Belgian American Educational Foundation (B.A.E.F.) and the Fulbright Commission of Belgium and Luxemburg to SD. B. Erkkila, M. Wint, L. Elder and numerous students of the Yale Analytical and Stable Isotope Center, D. Andreasen of the UCSC Stable Isotope Laboratory, Megan Wilding and Bastian Hambach of the NOCS stable isotope lab, and Henning Kuhnert and the team of the MARUM isotope lab are thanked for assistance with isotopic analyses. All Bayesian Morkov Chain Monte Carlo analyses were run on the PALMA-II High Performance Computing cluster provided by the University of Münster. Open Access funding enabled and organized by Projekt DEAL. This research used samples and data provided by the International Ocean Discovery Program (IODP) and its predecessors, a program sponsored by NSF and participating countries under the management of Joint Oceanographic Institutions. XRF core‐scanning was made possible thanks to the instrumentation and support of the SIO Geological Collections at the Scripps Institution of Oceanography, University of California San Diego (managed by A. Hangsterfer). We warmly thank all shipboard and on‐shore scientists that contributed to XRF core scanning in Bremen and San Diego. Financial support was provided by the National Science Foundation (NSF) to PMH (NSF Award #1335261) and JCZ (NSF Award #1334209) and the Belgian American Educational Foundation (B.A.E.F.) and the Fulbright Commission of Belgium and Luxemburg to SD. B. Erkkila, M. Wint, L. Elder and numerous students of the Yale Analytical and Stable Isotope Center, D. Andreasen of the UCSC Stable Isotope Laboratory, Megan Wilding and Bastian Hambach of the NOCS stable isotope lab, and Henning Kuhnert and the team of the MARUM isotope lab are thanked for assistance with isotopic analyses. All Bayesian Morkov Chain Monte Carlo analyses were run on the PALMA‐II High Performance Computing cluster provided by the University of Münster. Open Access funding enabled and organized by Projekt DEAL.
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 13 Climate Action
Keywords
- Middle eocene
- Astronomical calibration
- Insolation quantities
- Solar-system
- Timescale
- Cyclostratigraphy
- Circulation
- Stability
- History
- Climate
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