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Astronomical constraints on the duration of the Early Jurassic Pliensbachian Stage and global climatic fluctuations

Ruhl, Micha; Hesselbo, Stephen P.; Hinnov, Linda; Jenkyns, Hugh C.; Xu, Weimu; Riding, James B.; Storm, Marisa S.; Minisini, Daniel; Ullmann, Clemens V.; Leng, Melanie J.

Authors

Micha Ruhl

Stephen P. Hesselbo

Linda Hinnov

Hugh C. Jenkyns

Weimu Xu

James B. Riding

Marisa S. Storm

Daniel Minisini

Clemens V. Ullmann



Abstract

The Early Jurassic was marked by multiple periods of major global climatic and palaeoceanographic change, biotic turnover and perturbed global geochemical cycles, commonly linked to large igneous province volcanism. This epoch was also characterised by the initial break-up of the super-continent Pangaea and the opening and formation of shallow-marine basins and ocean gateways, the timing of which are poorly constrained. Here, we show that the Pliensbachian Stage and the Sinemurian–Pliensbachian global carbon-cycle perturbation (marked by a negative shift in δ13Cδ13C of 2–4‰2–4‰), have respective durations of ∼8.7 and ∼2 Myr. We astronomically tune the floating Pliensbachian time scale to the 405 Kyr eccentricity solution (La2010d), and propose a revised Early Jurassic time scale with a significantly shortened Sinemurian Stage duration of 6.9±0.4 Myr6.9±0.4 Myr. When calibrated against the new time scale, the existing Pliensbachian seawater 87Sr/86Sr record shows relatively stable values during the first ∼2 Myr of the Pliensbachian, superimposed on the long-term Early Jurassic decline in 87Sr/86Sr. This plateau in 87Sr/86Sr values coincides with the Sinemurian–Pliensbachian boundary carbon-cycle perturbation. It is possibly linked to a late phase of Central Atlantic Magmatic Province (CAMP) volcanism that induced enhanced global weathering of continental crustal materials, leading to an elevated radiogenic strontium flux to the global ocean.

Citation

Ruhl, M., Hesselbo, S. P., Hinnov, L., Jenkyns, H. C., Xu, W., Riding, J. B., …Leng, M. J. (2016). Astronomical constraints on the duration of the Early Jurassic Pliensbachian Stage and global climatic fluctuations. Earth and Planetary Science Letters, 455, https://doi.org/10.1016/j.epsl.2016.08.038

Journal Article Type Article
Acceptance Date Aug 27, 2016
Online Publication Date Oct 5, 2016
Publication Date Dec 1, 2016
Deposit Date Oct 27, 2016
Publicly Available Date Oct 27, 2016
Journal Earth and Planetary Science Letters
Print ISSN 0012-821X
Electronic ISSN 0012-821X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 455
DOI https://doi.org/10.1016/j.epsl.2016.08.038
Keywords astrochronology; carbon-cycle; cyclostratigraphy; Early Jurassic; Pliensbachian; strontium isotopes
Public URL http://eprints.nottingham.ac.uk/id/eprint/38010
Publisher URL http://www.sciencedirect.com/science/article/pii/S0012821X16304678
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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