EGU2020-20732
https://doi.org/10.5194/egusphere-egu2020-20732
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Land plants and terrestrial environmental changes during the onset of the end-Triassic event

Sofie Lindström1, Hans Peter Nytoft1, Gunver K. Pedersen1, Grzegorz Niedzwiedzki2, Karen Dybkjær1, Leif Johansson3, Henrik I. Petersen4, Hamed Sanei5, Christian Tegner5, and Rikke Weibel1
Sofie Lindström et al.
  • 1GEUS, Stratigraphy Department, Copenhagen K, Denmark (sli@geus.dk; hpn@geus.dk; gkp@geus.dk; kd@geus.dk; rwh@geus.dk)
  • 2Department of Organismal Biology, Uppsala University, Uppsala (grzegorz.niedzwiedzki@ebc.uu.se)
  • 3Department of Geology, Lund University, Sweden (leif.johansson@geol.lu.se)
  • 4Total Upstream Denmark A/S, Copenhagen, Denmark (henrik-ingermann.petersen@total.com)
  • 5Institute of Geoscience, Aarhus University, Denmark (sanei@geo.au.dk; christian.tegner@geo.au.dk)

The end-Triassic mass extinction is considered to have been caused by voluminous and repeated emissions of CO2 and/or methane and other gases from magmatic activity in the Central Atlantic Magmatic Province. Despite improved geochronological dating and correlation between the magmatic activity and the extinctions, exactly how the biotic crisis commenced remains poorly understood. Here, we compile palynological and palaeobotanical data, bulk organic δ13C, biomarkers, mercury and other geochemical proxies, charcoal, and sedimentology, from a Rhaetian terrestrial succession in southern Sweden. Our results provide an insight into the climatic, environmental and ecosystem changes that took place at the onset of the mass extinction event.

How to cite: Lindström, S., Nytoft, H. P., Pedersen, G. K., Niedzwiedzki, G., Dybkjær, K., Johansson, L., Petersen, H. I., Sanei, H., Tegner, C., and Weibel, R.: Land plants and terrestrial environmental changes during the onset of the end-Triassic event, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-20732, https://doi.org/10.5194/egusphere-egu2020-20732, 2020

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Presentation version 1 – uploaded on 04 May 2020
  • CC1: Comment on EGU2020-20732, Emilia Jarochowska, 05 May 2020

    Hi Sofie et al, this is an impressive study, I am looking forward to see how your project further develops. There is so much interest in volcanism-derived Hg - is this occurrence of spore deformation seen systematically across other episodes of volcanism?

    • AC1: Reply to CC1, Sofie Lindström, 06 May 2020

      Hej Emilia. Thank you. This needs to be tested but there are indications of malformed spores and pollen across other volcanic-related mass exttinctions. Some of the malformations have been attributed to increased UVB radiation from ozone layer depletion. And we know that both radiation and toxicity can produce malformation in spores/pollen.