Astronomical pacing of methane release in the Early Jurassic period

David B. Kemp*, Angela L. Coe, Anthony S. Cohen, Lorenz Schwark

*Corresponding author for this work

Research output: Contribution to journalArticle

260 Citations (Scopus)

Abstract

A pronounced negative carbon-isotope (δ13C) excursion of ∼5-7‰ (refs 1-7) indicates the occurrence of a significant perturbation to the global carbon cycle during the Early Jurassic period (early Toarcian age, ∼183 million years ago). The rapid release of 12C-enriched biogenic methane as a result of continental-shelf methane hydrate dissociation has been put forward as a possible explanation for this observation. Here we report high-resolution organic carbon-isotope data from well-preserved mudrocks in Yorkshire, UK, which demonstrate that the carbon-isotope excursion occurred in three abrupt stages, each showing a shift of -2‰ to -3‰. Spectral analysis of these carbon-isotope measurements and of high-resolution carbonate abundance data reveals a regular cyclicity. We interpret these results as providing strong evidence that methane release proceeded in three rapid pulses and that these pulses were controlled by astronomically forced changes in climate, superimposed upon longer-term global warming. We also find that the first two pulses of methane release each coincided with the extinction of a large proportion of marine species.

Original languageEnglish
Pages (from-to)396-399
Number of pages4
JournalNature
Volume437
Issue number7057
DOIs
Publication statusPublished - 15 Sep 2005

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Carbon Isotopes
Methane
Global Warming
Carbon Cycle
Climate Change
Carbonates
Periodicity

ASJC Scopus subject areas

  • General

Cite this

Kemp, D. B., Coe, A. L., Cohen, A. S., & Schwark, L. (2005). Astronomical pacing of methane release in the Early Jurassic period. Nature, 437(7057), 396-399. https://doi.org/10.1038/nature04037

Astronomical pacing of methane release in the Early Jurassic period. / Kemp, David B.; Coe, Angela L.; Cohen, Anthony S.; Schwark, Lorenz.

In: Nature, Vol. 437, No. 7057, 15.09.2005, p. 396-399.

Research output: Contribution to journalArticle

Kemp, DB, Coe, AL, Cohen, AS & Schwark, L 2005, 'Astronomical pacing of methane release in the Early Jurassic period', Nature, vol. 437, no. 7057, pp. 396-399. https://doi.org/10.1038/nature04037
Kemp DB, Coe AL, Cohen AS, Schwark L. Astronomical pacing of methane release in the Early Jurassic period. Nature. 2005 Sep 15;437(7057):396-399. https://doi.org/10.1038/nature04037
Kemp, David B. ; Coe, Angela L. ; Cohen, Anthony S. ; Schwark, Lorenz. / Astronomical pacing of methane release in the Early Jurassic period. In: Nature. 2005 ; Vol. 437, No. 7057. pp. 396-399.
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