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Unveiling a new oceanic anoxic event at the Norian/Rhaetian boundary (Late Triassic)
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Unveiling a new oceanic anoxic event at the Norian/Rhaetian boundary (Late Triassic)
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Journal Article
Unveiling a new oceanic anoxic event at the Norian/Rhaetian boundary (Late Triassic)
2024
Overview
The latest Triassic was characterised by protracted biotic extinctions concluding in the End-Triassic Extinction (~ 200 Ma) and a global carbon cycle perturbation. The onset of declining diversity is closely related to reducing conditions that spread globally from upper Sevatian (uppermost Norian) to across the Norian-Rhaetian boundary, likely triggered by unusually high volcanic activity. We correlate significant organic carbon cycle perturbations to an increase of CO
2
in the ocean–atmosphere system, likely outgassed by the Angayucham igneous province, the onset of which is indicated by the initiation of a rapid decline in
87
Sr/
86
Sr and
188
Os/
187
Os seawater values. A possible causal mechanism involves elevated CO
2
levels causing global warming and accelerating chemical weathering, which increased nutrient discharge to the oceans and greatly increased biological productivity. Higher export production and oxidation of organic matter led to a global O
2
decrease in marine water across the Norian/Rhaetian boundary (NRB). Biotic consequences of dysoxia/anoxia include worldwide extinctions in some fossil groups, such as bivalves, ammonoids, conodonts, radiolarians.
