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Decoupling δ13Ccarb and δ13Corg at the onset of the Ireviken Carbon Isotope Excursion : Δ13C and organic carbon burial (forg) during a Silurian oceanic anoxic event

Hartke, Emma R. ; Cramer, Bradley D. ; Calner, Mikael LU orcid ; Melchin, Michael J. ; Barnett, Bruce A. ; Oborny, Stephan C. and Bancroft, Alyssa M. (2021) In Global and Planetary Change 196.
Abstract

Paired records of δ13Ccarb and δ13Corg across the Llandovery-Wenlock boundary demonstrate asynchronous behavior during the onset of the Ireviken Biogeochemical Event (IBE). The extremely high-resolution data produced from the Altajme Core, drilled from Gotland, Sweden, capture a negative excursion in δ13Corg during the initiation of the Ireviken Extinction Event (IEE) and prior to the onset of the Ireviken positive δ13Ccarb Excursion (ICIE). The record of carbon isotopic changes through this interval illustrate that both Δ13C (the difference between δ13Ccarb and δ13Corg) as well as the relative... (More)

Paired records of δ13Ccarb and δ13Corg across the Llandovery-Wenlock boundary demonstrate asynchronous behavior during the onset of the Ireviken Biogeochemical Event (IBE). The extremely high-resolution data produced from the Altajme Core, drilled from Gotland, Sweden, capture a negative excursion in δ13Corg during the initiation of the Ireviken Extinction Event (IEE) and prior to the onset of the Ireviken positive δ13Ccarb Excursion (ICIE). The record of carbon isotopic changes through this interval illustrate that both Δ13C (the difference between δ13Ccarb and δ13Corg) as well as the relative flux of organic carbon burial (forg) vary in unique ways and at different times during the progression of the IBE. Both process-oriented variables within the global carbon cycle (Δ13C and forg) track a series of events that help to demonstrate potential causative mechanisms of both the extinction and carbon cycle perturbation. The sequence of events demonstrated here largely mirror the cascade of events that took place during the Cretaceous Oceanic Anoxic Event 2 (OAE2) and a detailed comparison between the two events is provided here for the first time. The unique insight into the IBE presented in this work results primarily from the novel, nearly Neogene-scale resolution of the paired isotope data, which demonstrates the critical importance of high-resolution chemostratigraphic research to evaluating ancient perturbations to the Earth-life system. Additional data sets of equal or greater resolution through this interval will be critical to evaluate the global synchroneity of these short-lived events during the IBE, and similar high-resolution studies of other Paleozoic biogeochemical events may shed light on potentially similar causative mechanisms.

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Contribution to journal
publication status
published
subject
in
Global and Planetary Change
volume
196
article number
103373
publisher
Elsevier
external identifiers
  • scopus:85096645713
ISSN
0921-8181
DOI
10.1016/j.gloplacha.2020.103373
language
English
LU publication?
yes
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4641a466-6ded-4634-a8a9-fd103ac60c20
date added to LUP
2020-12-03 10:52:41
date last changed
2023-03-16 00:00:37
@article{4641a466-6ded-4634-a8a9-fd103ac60c20,
  abstract     = {{<p>Paired records of δ<sup>13</sup>C<sub>carb</sub> and δ<sup>13</sup>C<sub>org</sub> across the Llandovery-Wenlock boundary demonstrate asynchronous behavior during the onset of the Ireviken Biogeochemical Event (IBE). The extremely high-resolution data produced from the Altajme Core, drilled from Gotland, Sweden, capture a negative excursion in δ<sup>13</sup>C<sub>org</sub> during the initiation of the Ireviken Extinction Event (IEE) and prior to the onset of the Ireviken positive δ<sup>13</sup>C<sub>carb</sub> Excursion (ICIE). The record of carbon isotopic changes through this interval illustrate that both Δ<sup>13</sup>C (the difference between δ<sup>13</sup>C<sub>carb</sub> and δ<sup>13</sup>C<sub>org</sub>) as well as the relative flux of organic carbon burial (f<sub>org</sub>) vary in unique ways and at different times during the progression of the IBE. Both process-oriented variables within the global carbon cycle (Δ<sup>13</sup>C and f<sub>org</sub>) track a series of events that help to demonstrate potential causative mechanisms of both the extinction and carbon cycle perturbation. The sequence of events demonstrated here largely mirror the cascade of events that took place during the Cretaceous Oceanic Anoxic Event 2 (OAE2) and a detailed comparison between the two events is provided here for the first time. The unique insight into the IBE presented in this work results primarily from the novel, nearly Neogene-scale resolution of the paired isotope data, which demonstrates the critical importance of high-resolution chemostratigraphic research to evaluating ancient perturbations to the Earth-life system. Additional data sets of equal or greater resolution through this interval will be critical to evaluate the global synchroneity of these short-lived events during the IBE, and similar high-resolution studies of other Paleozoic biogeochemical events may shed light on potentially similar causative mechanisms.</p>}},
  author       = {{Hartke, Emma R. and Cramer, Bradley D. and Calner, Mikael and Melchin, Michael J. and Barnett, Bruce A. and Oborny, Stephan C. and Bancroft, Alyssa M.}},
  issn         = {{0921-8181}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Global and Planetary Change}},
  title        = {{Decoupling δ<sup>13</sup>C<sub>carb</sub> and δ<sup>13</sup>C<sub>org</sub> at the onset of the Ireviken Carbon Isotope Excursion : Δ<sup>13</sup>C and organic carbon burial (f<sub>org</sub>) during a Silurian oceanic anoxic event}},
  url          = {{http://dx.doi.org/10.1016/j.gloplacha.2020.103373}},
  doi          = {{10.1016/j.gloplacha.2020.103373}},
  volume       = {{196}},
  year         = {{2021}},
}