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Astronomical pacing of late Palaeocene to early Eocene global warming events - Nature

  • ️Raffi, Isabella
  • ️Wed Jun 08 2005
  • Letter
  • Published: 08 June 2005

Nature volume 435, pages 1083–1087 (2005)Cite this article

Abstract

At the boundary between the Palaeocene and Eocene epochs, about 55 million years ago, the Earth experienced a strong global warming event, the Palaeocene–Eocene thermal maximum1,2,3,4. The leading hypothesis to explain the extreme greenhouse conditions prevalent during this period is the dissociation of 1,400 to 2,800 gigatonnes of methane from ocean clathrates5,6, resulting in a large negative carbon isotope excursion and severe carbonate dissolution in marine sediments. Possible triggering mechanisms for this event include crossing a threshold temperature as the Earth warmed gradually7, comet impact8, explosive volcanism9,10 or ocean current reorganization and erosion at continental slopes11, whereas orbital forcing has been excluded12. Here we report a distinct carbonate-poor red clay layer in deep-sea cores from Walvis ridge13, which we term the Elmo horizon. Using orbital tuning, we estimate deposition of the Elmo horizon at about 2 million years after the Palaeocene–Eocene thermal maximum. The Elmo horizon has similar geochemical and biotic characteristics as the Palaeocene–Eocene thermal maximum, but of smaller magnitude. It is coincident with carbon isotope depletion events in other ocean basins, suggesting that it represents a second global thermal maximum. We show that both events correspond to maxima in the ∼405-kyr and ∼100-kyr eccentricity cycles that post-date prolonged minima in the 2.25-Myr eccentricity cycle, implying that they are indeed astronomically paced.

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Acknowledgements

This research used samples and data provided by the Ocean Drilling Program (ODP). This work was supported by the Netherlands Organisation for Scientific Research (L.J.L., A.S. and D.K.), Utrecht Biogeology Centre (A.S.), Deutsche Forschungsgemeinschaft (U.R.), and the National Science Foundation (J.C.Z., E.T. and J.B.). We thank the scientific and non-scientific crew of ODP Leg 208, J. Suhonen in particular, and G. Ittman, A. E. van Dijk, G. M. Ganssen, S. J. A. Jung, H. B. Vonhof, P. L. Koch, H. Brinkhuis, F. J. Hilgen, T. Kouwenhoven and J. W. Zachariasse for technical support, advice and comments.

Author information

Authors and Affiliations

  1. Faculty of Geosciences, Department of Earth Sciences,

    Lucas J. Lourens

  2. Laboratory of Palaeobotany and Palynology, Department of Palaeoecology, Utrecht University, Budapestlaan 4, 3584 CD, Utrecht, The Netherlands

    Appy Sluijs

  3. Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands

    Dick Kroon

  4. Earth Science Department, University of California, Santa Cruz, Earth and Marine Sciences Building, 95064, Santa Cruz, California, USA

    James C. Zachos

  5. Department of Earth and Environmental Sciences, Wesleyan University, 265 Church Street, Middletown, Connecticut, 06459-0139, USA

    Ellen Thomas

  6. Center for the Study of Global Change, Department of Geology and Geophysics, Yale University, PO Box 208109, Connecticut, 06520-8109, New Haven, USA

    Ellen Thomas

  7. DFG Research Center for Ocean Margins (RCOM), University of Bremen, Leobener Strasse, 28359, Bremen, Germany

    Ursula Röhl

  8. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, 9500 Gilman Drive, MC0208, California, 92093, USA

    Julie Bowles

  9. Facoltà di Scienze, Dipartimento Scienze della Terra., Università “G. d'Annunzio” di Chieti, Campus Universitario Madonna delle Piane, Via dei Vestini 31, 66013, Chieti Scalo, Italy

    Isabella Raffi

Authors

  1. Lucas J. Lourens

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  2. Appy Sluijs

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  3. Dick Kroon

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  4. James C. Zachos

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  5. Ellen Thomas

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  6. Ursula Röhl

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  7. Julie Bowles

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  8. Isabella Raffi

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Correspondence to Lucas J. Lourens.

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Supplementary information

Supplementary Notes

Supplementary Figures S1-S6, additional references and extended description of methods used and discussion on: magnetobiostratigraphy; magnetic susceptibility and CaCO3 weight% scales shown in Figure 1; spectral results and astronomical phase relations; and global significance of the Elmo horizon/ETM2 event. (PDF 3096 kb)

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Lourens, L., Sluijs, A., Kroon, D. et al. Astronomical pacing of late Palaeocene to early Eocene global warming events. Nature 435, 1083–1087 (2005). https://doi.org/10.1038/nature03814

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  • Received: 17 November 2004

  • Accepted: 10 May 2005

  • Published: 08 June 2005

  • Issue Date: 23 June 2005

  • DOI: https://doi.org/10.1038/nature03814

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