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No causal link between terrestrial ecosystem change and methane release during the end-Triassic mass extinction

Lindström, Sofie LU ; van de Schootbrugge, Bas ; Dybkjær, Karen ; Pedersen, Gunver Krarup ; Fiebig, Jens ; Nielsen, Lars Henrik and Richoz, Sylvain LU (2012) In Geology 40(6). p.531-534
Abstract

Profound changes in both marine and terrestrial biota during the end-Triassic mass extinction event and associated successive carbon cycle perturbations across the Triassic-Jurassic boundary (T-J, 201.3 Ma) have primarily been attributed to volcanic emissions from the Central Atlantic Magmatic Province and/or injection of methane. Here we present a new extended organic carbon isotope record from a cored T-J boundary succession in the Danish Basin, dated by high-resolution palynostratigraphy and supplemented by a marine faunal record. Correlated with reference C-isotope and biotic records from the UK, it provides new evidence that the major biotic changes, both on land and in the oceans, commenced prior to the most prominent negative... (More)

Profound changes in both marine and terrestrial biota during the end-Triassic mass extinction event and associated successive carbon cycle perturbations across the Triassic-Jurassic boundary (T-J, 201.3 Ma) have primarily been attributed to volcanic emissions from the Central Atlantic Magmatic Province and/or injection of methane. Here we present a new extended organic carbon isotope record from a cored T-J boundary succession in the Danish Basin, dated by high-resolution palynostratigraphy and supplemented by a marine faunal record. Correlated with reference C-isotope and biotic records from the UK, it provides new evidence that the major biotic changes, both on land and in the oceans, commenced prior to the most prominent negative C-isotope excursion. If massive methane release was involved, it did not trigger the end-Triassic mass extinction. Instead, this negative C-isotope excursion is contemporaneous with the onset of floral recovery on land, whereas marine ecosystems remained perturbed. The decoupling between ecosystem recovery on land and in the sea is more likely explained by long-term flood basalt volcanism releasing both SO2 and CO2 with short- and long-term effects, respectively.

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author
; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
in
Geology
volume
40
issue
6
pages
4 pages
publisher
Geological Society of America
external identifiers
  • scopus:84864294441
ISSN
0091-7613
DOI
10.1130/G32928.1
language
English
LU publication?
no
id
5bf4fb12-fac4-4a59-a158-2929b92a7e13
date added to LUP
2019-05-09 15:20:55
date last changed
2020-12-22 04:06:53
@article{5bf4fb12-fac4-4a59-a158-2929b92a7e13,
  abstract     = {<p>Profound changes in both marine and terrestrial biota during the end-Triassic mass extinction event and associated successive carbon cycle perturbations across the Triassic-Jurassic boundary (T-J, 201.3 Ma) have primarily been attributed to volcanic emissions from the Central Atlantic Magmatic Province and/or injection of methane. Here we present a new extended organic carbon isotope record from a cored T-J boundary succession in the Danish Basin, dated by high-resolution palynostratigraphy and supplemented by a marine faunal record. Correlated with reference C-isotope and biotic records from the UK, it provides new evidence that the major biotic changes, both on land and in the oceans, commenced prior to the most prominent negative C-isotope excursion. If massive methane release was involved, it did not trigger the end-Triassic mass extinction. Instead, this negative C-isotope excursion is contemporaneous with the onset of floral recovery on land, whereas marine ecosystems remained perturbed. The decoupling between ecosystem recovery on land and in the sea is more likely explained by long-term flood basalt volcanism releasing both SO<sub>2</sub> and CO<sub>2</sub> with short- and long-term effects, respectively.</p>},
  author       = {Lindström, Sofie and van de Schootbrugge, Bas and Dybkjær, Karen and Pedersen, Gunver Krarup and Fiebig, Jens and Nielsen, Lars Henrik and Richoz, Sylvain},
  issn         = {0091-7613},
  language     = {eng},
  month        = {06},
  number       = {6},
  pages        = {531--534},
  publisher    = {Geological Society of America},
  series       = {Geology},
  title        = {No causal link between terrestrial ecosystem change and methane release during the end-Triassic mass extinction},
  url          = {http://dx.doi.org/10.1130/G32928.1},
  doi          = {10.1130/G32928.1},
  volume       = {40},
  year         = {2012},
}