Neogene and Quaternary dinoflagellate cyst biostratigraphy and paleoclimatology of the Karl-1 borehole, Central Trough in the Danish North Sea area

摘要

The dinoflagellate cysts of Miocene-Quaternary beds of the Karl-1 borehole, Danish North Sea sector were studied for biostratigraphy and paleoecology. This report provide a revision of the dinoflagellate cyst biozonation for the Neogene-Quaternary of Costa and Manum. The revised dinoflagellate cyst zonation is used in the biostratigraphic description of the Karl-1 borehole. Paleoecological interpretations (paleodepth, paleotemperature, paleosalinity) based on dinoflagellate cysts are described in detail for the sidewall cores within the interval 6200-4200 feet. The Miocene was found to have been deposited in an outer neritic-oceanic paleoenvironment; the sea level apparently rose to a maximum near the Tortonian-Messinian boundary. The sea temperatures in the Early-Middle Miocene were subtropical, whereas the Late Miocene shows falling sea temperatures. (JT) (2 maps., 62 refs.)