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Asynchronous δ13Ccarb and δ13Corg records during the onset of the Mulde (Silurian) positive carbon isotope excursion from the Altajme core, Gotland, Sweden

Biebesheimer, Ellie J. ; Cramer, Bradley D. ; Calner, Mikael LU orcid ; Barnett, Bruce A. ; Oborny, Stephan C. and Bancroft, Alyssa M. (2021) In Chemical Geology 576.
Abstract

High-resolution paired analyses of δ13Ccarb and δ13Corg from a new drill core from Gotland, Sweden, demonstrate asynchronous positive change in the carbon isotope records during the onset of one of the major Silurian biogeochemical events known as the Mulde Event or “Big Crisis”. The detailed carbon isotope record presented here provides Δ13C (the difference between δ13Ccarb and δ13Corg) and allows the calculation of changes in organic carbon burial (forg) throughout the late Wenlock. The paired data suggest a ~ 38% increase in forg during the peak of the positive δ13Ccarb excursion and the... (More)

High-resolution paired analyses of δ13Ccarb and δ13Corg from a new drill core from Gotland, Sweden, demonstrate asynchronous positive change in the carbon isotope records during the onset of one of the major Silurian biogeochemical events known as the Mulde Event or “Big Crisis”. The detailed carbon isotope record presented here provides Δ13C (the difference between δ13Ccarb and δ13Corg) and allows the calculation of changes in organic carbon burial (forg) throughout the late Wenlock. The paired data suggest a ~ 38% increase in forg during the peak of the positive δ13Ccarb excursion and the high-resolution record reveals several short-lived inflections in Δ13C that have not been previously identified. When combined with sedimentological and sequence stratigraphic data from multiple paleocontinents, the new data presented here provide strong evidence for a transient global decrease in CO2, in support of previous interpretations of regression and global cooling coinciding with the Mulde Extinction Event.

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type
Contribution to journal
publication status
published
subject
in
Chemical Geology
volume
576
article number
120256
publisher
Elsevier
external identifiers
  • scopus:85105014095
ISSN
0009-2541
DOI
10.1016/j.chemgeo.2021.120256
language
English
LU publication?
yes
id
625a934c-4b7d-41da-aa94-3be71e43bd93
date added to LUP
2021-05-17 13:40:03
date last changed
2023-03-07 22:31:44
@article{625a934c-4b7d-41da-aa94-3be71e43bd93,
  abstract     = {{<p>High-resolution paired analyses of δ<sup>13</sup>C<sub>carb</sub> and δ<sup>13</sup>C<sub>org</sub> from a new drill core from Gotland, Sweden, demonstrate asynchronous positive change in the carbon isotope records during the onset of one of the major Silurian biogeochemical events known as the Mulde Event or “Big Crisis”. The detailed carbon isotope record presented here provides 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>) and allows the calculation of changes in organic carbon burial (f<sub>org</sub>) throughout the late Wenlock. The paired data suggest a ~ 38% increase in f<sub>org</sub> during the peak of the positive δ<sup>13</sup>C<sub>carb</sub> excursion and the high-resolution record reveals several short-lived inflections in Δ<sup>13</sup>C that have not been previously identified. When combined with sedimentological and sequence stratigraphic data from multiple paleocontinents, the new data presented here provide strong evidence for a transient global decrease in CO<sub>2</sub>, in support of previous interpretations of regression and global cooling coinciding with the Mulde Extinction Event.</p>}},
  author       = {{Biebesheimer, Ellie J. and Cramer, Bradley D. and Calner, Mikael and Barnett, Bruce A. and Oborny, Stephan C. and Bancroft, Alyssa M.}},
  issn         = {{0009-2541}},
  language     = {{eng}},
  month        = {{08}},
  publisher    = {{Elsevier}},
  series       = {{Chemical Geology}},
  title        = {{Asynchronous δ<sup>13</sup>C<sub>carb</sub> and δ<sup>13</sup>C<sub>org</sub> records during the onset of the Mulde (Silurian) positive carbon isotope excursion from the Altajme core, Gotland, Sweden}},
  url          = {{http://dx.doi.org/10.1016/j.chemgeo.2021.120256}},
  doi          = {{10.1016/j.chemgeo.2021.120256}},
  volume       = {{576}},
  year         = {{2021}},
}