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

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Авторы: Zakharov V.A.     Rogov M.A.     Dzyuba O.S.   (ИНГГ СО РАН)   Zak K.     Kostak M.     Pruner P.     Skupien P.     Chadima M.     Mazuch M.     Nikitenko B.L.   (ИНГГ СО РАН)  
дата публикации: 2014
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 δ18 O data show an irregular decrease from values reaching up to +1.6 parts per thousand in the Middle Oxfordian and from +0.8 to -1.7 parts per thousand 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 δ C-13 near the J/K boundary and could reflect blooms of green algae caused by disturbance of the marine ecosystem
первоисточник: Polar Research
страницы: 19714-19714 (19 pg.)
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