Anomalies in the marine nutrient cycle triggering biotic crises on continental shelves during oceanic anoxic events

Dubicka Zofia, Danuta Peryt, Marcin Barski & Maciej Bojanowski
The widespread expansion of the oxygen minimum zone onto shelves has been commonly regarded as a primary cause of benthos extinction in epicratonic sea ecosystems during the Cenomanian–Turonian boundary event (CTBE). However, neither lithology, geochemical proxies, nor micropaleontological data support this hypothesis. Instead, our integrated foraminiferal and dinoflagellate cyst study corroborated by δ13Corg and δ15Norg data indicate well oxygenated oligotrophic environment and a collapse of primary productivity in an epicontinental basin that have apparently left...
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