(Table 1) Dinoflagellate cysts and acritarchs in upper Pliocene and Pleistocene sediments from ODP Hole 151-911A

• Main Authors: Matthiessen, Jens, Brenner, Wolfram W
• Format: Dataset
• Language: English
• Published: PANGAEA 1996
• Subjects: 151-911A; Achomosphaera spp.; Acritarch sp.; Algidasphaeridium minutum; Ataxiodinium choane; Bitectatodinium tepikiense; Brigantedinium simplex; Brigantedinium spp.; DEPTH; sediment/rock; Dinoflagellate cyst; Dinoflagellate cyst indeterminata; Dinoflagellate cyst per unit mass; Dinoflagellate zone; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Filisphaera filifera; Habibacysta tectata; Impagidinium aculeatum; Impagidinium cf. strialatum; Impagidinium pallidum; Impagidinium paradoxum; Impagidinium patulum; Impagidinium sp.; Impagidinium spp.; Joides Resolution; Leg151; Lejeunecysta communis; Lejeunecysta mariae; Lejeunecysta sp.; Lejeunecysta spp.; Lingulodinium machaerophorum; Nematosphaeropsis labyrinthus; North Greenland Sea; Ocean Drilling Program; ODP; Operculodinium centrocarpum; Operculodinium crassum; Operculodinium psilatum; Operculodinium sp.; Pentapharsodinium cf. dalei; Protoperidinium spp.; Sample code/label; Selenopemphix nephroides; Selenopemphix quanta; Spiniferites elongatus; Spiniferites mirabilis; Spiniferites spp.; Stelladinium stellatum; Arctic; Arctic Ocean; Greenland; Norwegian Sea; Yermak Plateau; Greenland Sea; North Greenland; Sea ice; Yermak plateau
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.761371; https://doi.org/10.1594/PANGAEA.761371

Pliocene and Pleistocene sediments from Ocean Drilling Program Leg 151, Hole 911 A, drilled on the innermost Yermak Plateau (Eastern Arctic Ocean), were studied for their dinoflagellate cyst content. Three assemblage zones were tentatively defined, characterized by the predominance of few species. The composition of the assemblages changed markedly, even within single assemblage zones, during the last 2.6 to 2.8 m.y., reflecting the variable influence of warmer water from the Norwegian Sea, fluctuations in the influence of cold polar water masses, and the extent of sea-ice cover. Polar to subpolar surface water masses prevailed on the Yermak Plateau during the late Pliocene, when the eastern Arctic Ocean was probably isolated from the Norwegian-Greenland Sea. Intrusions of warmer water are recorded since the latest Pliocene, alternating with colder periods and a prolonged seasonal sea-ice cover. The composition of the dinoflagellate cyst assemblages has also changed considerably since the middle Pleistocene, reflecting the establishment of stronger fluctuations in surface water mass conditions than before at Yermak Plateau.