Abstract
Abstract The Toarcian oceanic anoxic event (T-OAE; 183 Ma) was accompanied by severe biotic and geochemical perturbations that are considered as some of the most severe of the Mesozoic era. Nevertheless, paleoceanographic conditions during the T-OAE in the Tethyan domain remain poorly understood owing to the relatively low number of marine successions from this area investigated so far. In this study, we report new geochemical, palynological and pyrite framboid size data from Zazriva, northwestern Slovakia, a Lower Toarcian marine succession recording organic-rich sedimentation at the margin of the NW-European shelf. The lowermost Serpentinum ammonite Zone records high total organic carbon (TOC) contents (2 to 5 wt%) and very low organic carbon isotope values (from −30 to −32‰) characteristic of the T-OAE negative carbon isotope excursion in coeval sites. The size of the pyrite framboids, the high S contents independent on TOC, low sulfur isotope values (δ34S
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