Dinoflagellate and other palynomorph abundance in sediments from ODP Leg 189 sites ...

• Main Authors: Sluijs, Appy, Brinkhuis, Henk, Stickley, Catherine E, Warnaar, Jeroen, Williams, Graham L, Fuller, Michael D
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2003
• Subjects: Drilling/drill rig; Leg189; Joides Resolution; Ocean Drilling Program ODP; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.779998; https://doi.pangaea.de/10.1594/PANGAEA.779998

At Ocean Drilling Program (ODP) Leg 189 Sites 1170-1172, the climatologically critical Eocene-Oligocene (E-O) transition is barren of any calcareous microfossils but contains rich marine organic walled dinoflagellate cyst (dinocyst) and diatom assemblages, suitable for detailed biostratigraphic and paleoenvironmental analysis. The resulting first-ever integrated dinocyst/diatom magnetostratigraphy allows confident correlation of the E-O interval between all Leg 189 sites, including Site 1168. Our correlations indicate that the (deep) opening of the Tasmanian Gateway occurred quasi-synchronously throughout the Tasmanian region, starting at ~35.5 Ma. At Sites 1170-1172, quantitatively, three distinct dinocyst assemblages may be distinguished that reflect the relatively rapid and pronounced stepwise environmental changes associated with the E-O transition in the Tasmanian region, from a pro-deltaic setting to a deep marine pelagic setting. Moreover, synchronous with the deepening of the gateway, at the southern ... : Supplement to: Sluijs, Appy; Brinkhuis, Henk; Stickley, Catherine E; Warnaar, Jeroen; Williams, Graham L; Fuller, Michael D (2003): Dinoflagellate cysts from the Eocene-Oligocene transition in the Southern Ocean: results from ODP Leg 189. In: Exon, NF; Kennett, JP; Malone, MJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 189, 1-42 ...