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Constraints on the numerical age of the Paleocene/Eocene boundary

Constraints on the numerical age of the Paleocene/Eocene boundary
Constraints on the numerical age of the Paleocene/Eocene boundary
Here we present combined radio-isotopic dating (U-Pb zircon) and cyclostratigraphic analysis of the carbon isotope excursion at the Paleocene/Eocene (P/E) boundary in Spitsbergen, to determine the numerical age of the boundary. Incorporating the total uncertainty from both radio-isotopic and cyclostratigraphic datasets gives an age ranging from 55.728-55.964 Ma, within error of a recently proposed astronomical age of ~55.93 Ma. Combined with the assumption that the Paleocene Epoch spans twenty-five 405 kyr cycles, our new age for the boundary suggests an age of ~66 Ma for the Cretaceous/Paleogene (K/Pg) boundary. Furthermore, our P/E boundary age is consistent with the hypothesis that the onset of the Paleocene-Eocene thermal maximum (PETM) at the boundary occurred on the falling limb of a 405 kyr cycle, suggesting the event was initiated by a different mechanism to that which triggered the other early Eocene hyperthermals.
1525-2027
Q0AA17
Charles, Adam J.
dfed4bbd-ea2a-4ff9-81f5-de2af563943b
Condon, Daniel J.
badc146b-cda6-444a-866b-1d78a0e12ad9
Harding, Ian C.
5d63b829-a9a7-447f-aa3f-62e8d0e715cb
Pälike, Heiko
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Marshall, John E.A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Cui, Ying
5c157b47-a961-44cf-b1d6-0156818d5963
Kump, Lee
8ad0745b-4acc-449a-9449-e903d6609a32
Croudace, Ian W.
24deb068-d096-485e-8a23-a32b7a68afaf
Charles, Adam J.
dfed4bbd-ea2a-4ff9-81f5-de2af563943b
Condon, Daniel J.
badc146b-cda6-444a-866b-1d78a0e12ad9
Harding, Ian C.
5d63b829-a9a7-447f-aa3f-62e8d0e715cb
Pälike, Heiko
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Marshall, John E.A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Cui, Ying
5c157b47-a961-44cf-b1d6-0156818d5963
Kump, Lee
8ad0745b-4acc-449a-9449-e903d6609a32
Croudace, Ian W.
24deb068-d096-485e-8a23-a32b7a68afaf

Charles, Adam J., Condon, Daniel J., Harding, Ian C., Pälike, Heiko, Marshall, John E.A., Cui, Ying, Kump, Lee and Croudace, Ian W. (2011) Constraints on the numerical age of the Paleocene/Eocene boundary. Geochemistry, Geophysics, Geosystems, 12 (6), Q0AA17. (doi:10.1029/2010GC003426).

Record type: Article

Abstract

Here we present combined radio-isotopic dating (U-Pb zircon) and cyclostratigraphic analysis of the carbon isotope excursion at the Paleocene/Eocene (P/E) boundary in Spitsbergen, to determine the numerical age of the boundary. Incorporating the total uncertainty from both radio-isotopic and cyclostratigraphic datasets gives an age ranging from 55.728-55.964 Ma, within error of a recently proposed astronomical age of ~55.93 Ma. Combined with the assumption that the Paleocene Epoch spans twenty-five 405 kyr cycles, our new age for the boundary suggests an age of ~66 Ma for the Cretaceous/Paleogene (K/Pg) boundary. Furthermore, our P/E boundary age is consistent with the hypothesis that the onset of the Paleocene-Eocene thermal maximum (PETM) at the boundary occurred on the falling limb of a 405 kyr cycle, suggesting the event was initiated by a different mechanism to that which triggered the other early Eocene hyperthermals.

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Accepted/In Press date: March 2011
Published date: 7 June 2011
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 178361
URI: https://eprints.soton.ac.uk/id/eprint/178361
ISSN: 1525-2027
PURE UUID: d3626917-152e-4448-94ce-19c15e67304d
ORCID for Ian C. Harding: ORCID iD orcid.org/0000-0003-4281-0581
ORCID for John E.A. Marshall: ORCID iD orcid.org/0000-0002-9242-3646

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Date deposited: 24 Mar 2011 11:07
Last modified: 17 Jan 2019 01:38

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Contributors

Author: Adam J. Charles
Author: Daniel J. Condon
Author: Ian C. Harding ORCID iD
Author: Heiko Pälike
Author: Ying Cui
Author: Lee Kump
Author: Ian W. Croudace

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