High-resolution ammonite and carbon isotope stratigraphy across the Triassic-Jurassic boundary at New York Canyon (Nevada)

摘要: The Triassic–Jurassic boundary is generally considered as one of the major extinctions in history Phanerozoic. high-resolution ammonite correlations and carbon isotope marine record New York Canyon area allow to distinguish two negative excursions across this with different paleoenvironmental meanings. Late Rhaetian excursion related extinction regressive phase. Early Hettangian δ13Corg associated a floristic turnover radiolarian radiation. The end-Triassic extinction–Early Jurassic recovery fully compatible volcanism-triggered crisis, probably Central Atlantic Magmatic Province. main environmental stress might have been generated by repeated release SO2 gas, heavy metals emissions, darkening, subsequent cooling. This phase was followed long-term CO2 accumulation during development nutrient-rich waters favouring productivity deposition black shales.