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HPF-09 Marine and non-marine Jurassic; Global correlation and major geological events

Palynological evidence of synchronous changes within the terrestrial and marine realm at the Triassic/Jurassic boundary (Csõvár section, Hungary)

Annette Götz, Technische Universität Darmstadt (Germany)
Katrin Ruckwied, Shell International Exploration and Production B.V. (Netherlands)
József Pálfy, Hungarian Natural History Museum (Hungary)
János Haas, Hungarian Academy of Sciences-Eötvös University (Hungary)
 

The palynofacies of the Csõvár section (Hungary) was studied with the aim to infer climatic changes within the Triassic/Jurassic boundary interval. The studied section represents a continuous marine key section of the NW Tethyan realm, yielding a typical Late Rhaetian to Hettangian microflora. Previous studies constrained the Triassic/Jurassic boundary using ammonoid, conodont, radiolarian and foraminiferan biostratigraphy. The most striking feature in our study of the boundary interval is the synchronous peaks of prasinophytes and trilete spores, corresponding to the previously documented prominent negative carbon isotope excursion. The co-occurrence of both signals, the marine and terrestrial, are described for the first time from a marine boundary section and is proposed as a powerful correlation tool. The inferred major perturbation of marine and terrestrial ecosystems is probably related to the intense volcanism of the Central Atlantic Magmatic Province.