Podrobnosti záznamu

Název
    Palaeoenvironments and palaeoceanography changes across the Jurassic/Cretaceous boundary in the Arctic realm: case study of the Nordvik section (north Siberia, Russia)
Autor
    Chadima, Martin
    Dzyuba, O. S.
    Košťák, M.
    Mazuch, M.
    Nikitenko, B. L.
    Pruner, Petr
    Rogov, M. A.
    Skupien, P.
    Zakharov, V. A.
    Žák, Karel
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Polar Research
Svazek/č.
    Roč. 33, 25 March
Rok
    2014
Poznámky
    Projekt: GA205/07/1365, GA ČR3cav_un_auth*0228750
    Rozsah: 19 s. : E
    Výzkumný záměr: CEZ:AV0Z30130516
Předmětová kategorie
    Arctic Realm
    biodiversity
    J/K boundary
    palaeoceanography
    stable isotopes
Klíčové slovo
    Across
    Arctic
    Boundary
    Case
    Changes
    Jurassic/Cretaceous
    Nordvik
    North
    Palaeoceanography
    Palaeoenvironments
    Realm
    Russia
    Section
    Siberia
    Study
Abstrakt (anglicky)
   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 δ18O 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 δ13C near the J/K boundary and could reflect blooms of green algae caused by disturbance of the marine ecosystem.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014