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The Jurassic/Cretaceous transition was accompanied by significant changesin palaeoceanography and palaeoenvironments in the Tethyan Realm, butoutside the Tethys such data are very scarce. Here we present results of a studyof the most complete section in the Panboreal Superrealm, the Nordviksection. Belemnite d18O data show an irregular decrease from values reachingup to  1.6  in the Middle Oxfordian and from  0.8 to  1.7  in the basalRyazanian, indicating a prolonged warming. The biodiversity changes werestrongly related to sea-level oscillations, showing a relatively low belemniteand high ammonite diversity during sea-level rise, accompanied by a decreaseof the macrobenthos taxonomical richness. The most prominent sea-level riseis marked by the occurrence of open sea ammonites with Pacific affinities. Peakabundances of spores and prasinophytes correlate with a negative excursion inorganic carbon d13C near the J/K boundary and could reflect blooms of greenalgae caused by disturbance of the marine ecosystem.Web of Science33art. no. 1971

polar research

Palaeoenvironments and palaeoceanography changes across the Jurassic/Cretaceous boundary in the Arctic realm: case study of the Nordvik section (north Siberia, Russia)