Orbital pacing and secular evolution of the Early Jurassic carbon cycle
dc.contributor.author | Storm, MS | |
dc.contributor.author | Hesselbo, SP | |
dc.contributor.author | Jenkyns, HC | |
dc.contributor.author | Ruhl, M | |
dc.contributor.author | Ullmann, CV | |
dc.contributor.author | Xu, W | |
dc.contributor.author | Leng, MJ | |
dc.contributor.author | Riding, JB | |
dc.contributor.author | Gorbanenko, O | |
dc.date.accessioned | 2020-02-11T11:50:10Z | |
dc.date.issued | 2020-02-10 | |
dc.description.abstract | Global perturbations to the Early Jurassic environment (∼201 to ∼174 Ma), notably during the Triassic–Jurassic transition and Toarcian Oceanic Anoxic Event, are well studied and largely associated with volcanogenic greenhouse gas emissions released by large igneous provinces. The long-term secular evolution, timing, and pacing of changes in the Early Jurassic carbon cycle that provide context for these events are thus far poorly understood due to a lack of continuous high-resolution δ13C data. Here we present a δ13CTOC record for the uppermost Rhaetian (Triassic) to Pliensbachian (Lower Jurassic), derived from a calcareous mudstone succession of the exceptionally expanded Llanbedr (Mochras Farm) borehole, Cardigan Bay Basin, Wales, United Kingdom. Combined with existing δ13CTOC data from the Toarcian, the compilation covers the entire Lower Jurassic. The dataset reproduces large-amplitude δ13CTOC excursions (>3‰) recognized elsewhere, at the Sinemurian–Pliensbachian transition and in the lower Toarcian serpentinum zone, as well as several previously identified medium-amplitude (∼0.5 to 2‰) shifts in the Hettangian to Pliensbachian interval. In addition, multiple hitherto undiscovered isotope shifts of comparable amplitude and stratigraphic extent are recorded, demonstrating that those similar features described earlier from stratigraphically more limited sections are nonunique in a long-term context. These shifts are identified as long-eccentricity (∼405-ky) orbital cycles. Orbital tuning of the δ13CTOC record provides the basis for an astrochronological duration estimate for the Pliensbachian and Sinemurian, giving implications for the duration of the Hettangian Stage. Overall the chemostratigraphy illustrates particular sensitivity of the marine carbon cycle to long-eccentricity orbital forcing. | en_GB |
dc.description.sponsorship | Natural Environment Research Council (NERC) | en_GB |
dc.description.sponsorship | Shell International Exploration & Production B.V. | en_GB |
dc.description.sponsorship | International Continental Scientific Drilling Program | en_GB |
dc.identifier.citation | Published online 10 February 2020 | en_GB |
dc.identifier.doi | 10.1073/pnas.1912094117 | |
dc.identifier.grantnumber | NE/N018508/1 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/40823 | |
dc.language.iso | en | en_GB |
dc.publisher | National Academy of Sciences | en_GB |
dc.rights | © 2020 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY). | en_GB |
dc.subject | astrochronology | en_GB |
dc.subject | δ13CTOC | en_GB |
dc.subject | global carbon cycle | en_GB |
dc.subject | Early Jurassic | en_GB |
dc.title | Orbital pacing and secular evolution of the Early Jurassic carbon cycle | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2020-02-11T11:50:10Z | |
dc.identifier.issn | 0027-8424 | |
dc.description | This is the final version. Available on open access from the National Academy of Sciences via the DOI in this record | en_GB |
dc.description | Data Availability Statement. All data discussed in the paper will be made available in the SI Appendix and Dataset S1. | en_GB |
dc.identifier.journal | Proceedings of the National Academy of Sciences | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2020-01-03 | |
exeter.funder | ::Natural Environment Research Council (NERC) | en_GB |
exeter.funder | ::Natural Environment Research Council (NERC) | en_GB |
exeter.funder | ::University of Oxford | en_GB |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2020-02-10 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2020-02-11T11:47:30Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2020-02-11T11:50:13Z | |
refterms.panel | B | en_GB |
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This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).