Geochemical records of the end-Triassic Crisis preserved in a deep marine section of the Budva Basin, Dinarides, Montenegro.

Sietze J. de Graaff, Lawrence M.E. Percival, Pim Kaskes, Thomas Déhais, Niels J. de Winter, Max N. Jansen, Jan Smit, Matthias Sinnesael, Johan Vellekoop, Honami Sato, Akira Ishikawa, Simo Spassov, Philippe Claeys, Steven Goderis

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Abstract

The end-Triassic extinction event (∼ 201.5 Ma) is one of the five major mass extinction events in Earth's history, however, considerable discussion continues on the exact causes and timing of the event. This is because, whilst certain geochemical data on T-J sections appears to be largely comparable globally, with for example a significant (up to 6‰) negative carbon-isotope (δ13C) excursion at the extinction horizon, more often than not other geochemical variations are neither uniform nor fully consistent between sections. Critical to this discussion is that the majority of the studied sections containing the end-Triassic extinction event are limited to shallow marine or terrestrial sections, which are prone to discontinuities and hiatuses. In this study, we present carbon isotopes (δ13Ccarb), total organic carbon (TOC), major and trace, mercury (Hg) and highly siderophile elements (HSE), osmium-isotope compositions and paleomagnetic data of a relatively less studied deep-marine T-J succession in the Budva Basin, Čanj, Montenegro. At Čanj, deep-marine Triassic limestones are abruptly interrupted by a ∼ 6 cm finely laminated clay layer, before transitioning to more argillaceous Jurassic red beds. The clay layer is interpreted to represent the end-Triassic extinction interval and is characterized by a negative carbon isotope excursion, relative heavy rare earth element (HREE) enrichment, Hg increase, HSE enrichment and a sharp shift to unradiogenic osmium-isotopic ratios. This establishes the Čanj section as a unique and well-preserved outcrop that exquisitely encapsulates the end-Triassic extinction in the Tethyan marine realm. The distinct geochemical markers recorded at Čanj are consistent with the Central Atlantic Magmatic Province as the main driver behind the end-Triassic extinction.
Original languageEnglish
Article number111250
Pages (from-to)1-16
Number of pages16
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume606
DOIs
Publication statusPublished - 2022

Bibliographical note

Funding Information:
We thank the Barringer Family Fund for Meteorite Impact Research for graciously funding this research, without it, this study could not have taken place. SJG is supported by Research Foundation Flanders (FWO; project G0A6517N ) and the Belgian Federal Science Policy Office (BELSPO). NJW, LMEP, MS, PK and JV would like to thank the FWO for Junior Postdoctoral Fellowship grant ID 12ZB220N and 12P4519N, PhD fellowship FWOTM782 and 11E6621N, and Senior Postdoctoral Fellowship (grant ID 12Z6621N) respectively. NJW thanks the European Commission for a MSCA-IF postdoctoral Fellowship (UNBIAS, grant ID 843011). MS is funded by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Advanced Grant AstroGeo-885250). HS and AI thank the JSPS KAKENHI Grant Numbers JP20K04113 and JP19H01998 . PC and SG thank the Excellence of Science project “ET-HoME” and the VUB Strategic Research Program for support. Shuzhong Shen is thanked for editorial handling, and we thank Špela Goričan and two anonymous reviewers for their constructive feedback on the manuscript. Friendly discussion with Pim de Graaff helped strengthen the manuscript. Kind thanks are presented to the people of Čanj and the owners of Apartmani Zec-Rabbit for providing a warm stay during our field campaign.

Publisher Copyright:
© 2022 Elsevier B.V.

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