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

Author:
  • Sofie Lindström
  • Bas van de Schootbrugge
  • Karen Dybkjær
  • Gunver Krarup Pedersen
  • Jens Fiebig
  • Lars Henrik Nielsen
  • Sylvain Richoz
Publishing year: 2012-06-01
Language: English
Pages: 531-534
Publication/Series: Geology
Volume: 40
Issue: 6
Document type: Journal article
Publisher: Geological Society of America

Abstract english

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.

Other

Published
  • ISSN: 0091-7613
Sylvain Richoz
E-mail: sylvain [dot] richoz [at] geol [dot] lu [dot] se

Senior lecturer

Lithosphere and Biosphere Science

+46 46 222 78 89

Sölvegatan 12, Lund

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