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Carbon isotope anomaly and other geochemical changes at the Triassic-Jurassic boundary from a marine section in Hungary

¹ Museum für Naturkunde, Universität zu Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany
² Laboratory for Geochemical Research, Hungarian Academy of Sciences, Budaörsi út 45, H-1112 Budapest, Hungary
³ Geological Research Group, Hungarian Academy of Sciences, Múzeum krt 4/a, H-1088 Budapest, Hungary
⁴ University of Szeged, Department of Mineralogy, Geochemistry and Petrology, POB 651, H-6701 Szeged, Hungary
⁵ Geological Survey of Canada, 101-605 Robson Street, Vancouver, British Columbia V6B 5J3, Canada
⁶ Hungarian Geological Institute, Stefánia út 14, H-1143 Budapest, Hungary

Most mass extinctions are linked with carbon isotope excursions, implying that biotic crises are coupled with changes in the global carbon cycle. The isotopic evolution during the end-Triassic extinction is far less documented than that for the other major Phanerozoic extinctions. Here we report a sharp and short-lived –3.5 excursion in carbon isotope values for carbonate (¹³C_carb) corresponding to a –2 excursion in the isotopic composition of marine organic matter (¹³C_org) and other geochemical changes from the topmost Triassic in the Csovár section in Hungary. The Triassic- Jurassic boundary is defined by ammonoid and conodont biostratigraphy in a marine limestone sequence. A decline in primary productivity, release of methane through dissociation of gas hydrates, or a combination of the two may account for the correlative biotic and isotopic events.

Key Words: Triassic • Jurassic • extinction • stable isotopes • carbon cycle

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