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Swiss Journal of Geosciences

, Volume 111, Issue 3, pp 445–460 | Cite as

Environmental changes and carbon cycle perturbations at the Triassic–Jurassic boundary in northern Switzerland

  • Nathan Looser
  • Elke Schneebeli-Hermann
  • Heinz Furrer
  • Thomas M. Blattmann
  • Stefano M. Bernasconi
Article
  • 166 Downloads

Abstract

The Triassic–Jurassic boundary is characterized by strong perturbations of the global carbon cycle, triggered by massive volcanic eruptions related to the onset of the Central Atlantic Magmatic Province. These perturbations are recorded by negative carbon isotope excursions (CIEs) which have been reported worldwide. In this study, Triassic–Jurassic boundary sections from the southern margin of the Central European Basin (CEB) located in northern Switzerland are analyzed for organic carbon and nitrogen isotopes in combination with particulate organic matter (POM) analyses. We reconstruct the evolution of the depositional environment from Late Triassic to Early Jurassic in northern Switzerland and show that observed negative shifts in δ13C of the total organic carbon (δ13CTOC) in the sediment are only subordinately influenced by varying organic matter (OM) composition and primarily reflect global changes in the carbon cycle. Based on palynology and the stratigraphic positions of isotopic shifts, the δ13CTOC record of the studied sections is correlated with the GSSP section at Kuhjoch (Tethyan realm) in Austria and with the St. Audrie’s Bay section (CEB realm) in southwest England. We also show that in contrast to POM analyses the applicability of organic carbon/total nitrogen (OC/TN) atomic ratios and stable isotopes of total nitrogen (δ15NTN) for detecting changes in source of OM is limited in marginal depositional environments with frequent changes in lithology and OM contents.

Keywords

Triassic–Jurassic boundary Northern Switzerland Stable carbon and nitrogen isotope geochemistry Sedimentology Palynology Chemostratigraphy 

Notes

Acknowledgements

We would like to thank Stewart Bishop and Madalina Jaggi for assistance in the laboratory and Stefan Wohlwend as well as André Strasser and an anonymous reviewer for their suggestions to improve this manuscript. We would also like to thank the University of Basel and the national cooperative for the disposal of radioactive waste of Switzerland (NAGRA) for access to core material.

Supplementary material

15_2018_315_MOESM1_ESM.pdf (86 kb)
Online Resource 1: Stratigraphic column and results for the Adlerberg 3 core. Information about the palynological associations and stages are from Schneebeli-Hermann et al. (2018). Thick grey lines show three-point moving averages (PDF 86 kb)
15_2018_315_MOESM2_ESM.pdf (166 kb)
Online Resource 2: Stratigraphic column and results for the Chilchzimmersattel outcrop. Stratigraphic information is from Jordan et al. (2016). Information about the palynological associations and stages are from Schneebeli-Hermann et al. (2018). Thick grey lines show three-point moving averages (PDF 166 kb)
15_2018_315_MOESM3_ESM.pdf (90 kb)
Online Resource 3: Stratigraphic column and results for the Frick outcrop. Thick grey lines show three-point moving averages (PDF 89 kb)

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Copyright information

© Swiss Geological Society 2018

Authors and Affiliations

  1. 1.Department of Earth SciencesETH ZurichZurichSwitzerland
  2. 2.Institute and Museum of PaleontologyUniversity of ZurichZurichSwitzerland

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