Dinoflagellate cysts in the Oligocene to Miocene sediments of IODP Site 318-U1356A

• Main Authors: Bijl, Peter K, Houben, Alexander J P, Bruls, Anja, Pross, Jörg, Sangiorgi, Francesca
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: 318-U1356A; Achilleodinium biformoides; Achomosphaera alcicornu; Acritarcha; chorate; microgranulate; psilate sphere; reticulate; Adnatosphaeridium sp.; Adnatosphaeridium spp.; Aiora fenestrata; Aireiana verrucosa; Alisocysta circumtabulata; Alterbidinium distinctum; Angiosperms; Apectodinium spp.; Arachnodinium antarcticum; Areoligera complex; Areoligera semicirculata; Ataxodinium spp.; Batiacasphaera; Batiacasphaera compta; Batiacasphaera hirsuta; Batiacasphaera micropapillata; Batiacasphaera minuta; Batiacasphaera sp.; Batiacasphaera sphaerica; Batiacasphaera spp.; Botryococcus; Brigantedinium complex; Brigantedinium pynei; Brigantedinium simplex; Brigantedinium sp.; Cerebrocysta bartonensis; Cerebrocysta delicata; Cerebrocysta sp.; Charlesdowniea clathrata; Charlesdowniea edwardsii; Cleistosphaeridium sp.; Cooksonidium capricornum; Cordosphaeridium fibrospinosum; Cordosphaeridium funiculatum; Cordosphaeridium minutum; Corrudinium; Corrudinium? labradori; Corrudinium incompositum; Antarc*; Antarctica; East Antarctica; Southern Ocean; Wilkes Land
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.883747; https://doi.org/10.1594/PANGAEA.883747

There is growing interest in the scientific community in reconstructing the paleoceanography of the Southern Ocean during the Oligocene-Miocene because these time intervals experienced atmospheric CO2 concentrations with relevance to our future. However, it has remained notoriously difficult to put the sedimentary archives used in these efforts into a temporal framework. This is at least partially due to the fact that the bio-events recorded in organic-walled dinoflagellate cysts (dinocysts), which often represent the only microfossil group preserved, have not yet been calibrated to the international time scale. We here present dinocyst ranges from Oligocene-Miocene sediments drilled offshore the Wilkes Land continental margin, East Antarctica (Integrated Ocean Drilling Program (IODP) Hole U1356A). In addition, we apply statistical means to test a priori assumptions about whether the recorded taxa were deposited in situ or were reworked from older strata. Moreover, we describe two new dinocyst species, Selenopemphix brinkhuisii sp. nov. and Lejeunecysta adeliensis sp. nov., which are identified as important markers for regional stratigraphic analysis. Finally, we calibrate all identified dinocyst events to the international time scale using independent age control from calcareous nannoplankton and magnetostratigraphy from IODP Hole U1356A, and propose a provisional dinoflagellate cyst zonation scheme for the Oligocene-Miocene of the Southern Ocean.