Brinkhuis, Henk; Sengers, S.; Sluijs, A.; Warnaar, J.; Williams, G. L. (2004): Latest Cretaceous-earliest Oligocene and Quaternary dinoflagellate cysts, ODP Site 1172, east Tasman Plateau. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Exon, Neville F., Kennett, James P., Malone, Mitchell J., Brinkhuis, Henk, Chaproniere, George C. H., Ennyu, Atsuhito, Fothergill, Patrick, Fuller, Michael D., Grauert, Marianne, Hill, Peter J., Janecek, Thomas R., Kelly, Daniel C., Latimer, Jennifer C., Nees, Stefan, Ninnemann, Ulysses S., Nuernberg, Dirk, Pekar, Stephen F., Pellaton, Caroline C., Pfuhl, Helen A., Robert, Christian M., Roessig, Kristeen L. McGonigal, Roehl, Ursula, Schellenberg, Stephen A., Shevenell, Amelia E., Stickley, Catherine E., Suzuki, Noritoshi, Touchard, Yannick, Wei, Wuchang, White, Timothy S., Proceedings of the Ocean Drilling Program; scientific results; the Tasmanian gateway; Cenozoic climatic and oceanographic development; covering Leg 189 of the cruises of the drilling vessel JOIDES Resolution; Hobart, Tasmania, to Sydney, Australia; Sites 1168-1172; 11 March-6 May 2000, 189, georefid:2005-011449

Abstract:
Palynomorphs were studied in samples from Ocean Drilling Program (ODP) Leg 189, Holes 1172A and 1172D (East Tasman Plateau; 2620 m water depth). Besides organic walled dinoflagellate cysts (dinocysts), broad categories of other palynomorphs were quantified in terms of relative abundance. In this contribution, we provide an overview of the dinocyst distribution from the Maastrichtian to lowermost Oligocene and Quaternary intervals and illustrate main trends in palynomorph distribution. The uppermost Cretaceous-lowermost Oligocene succession of Site 1172 has a confident biomagnetostratigraphy, enabling us to tie early Paleogene Southern Hemisphere dinocyst events to the geomagnetic polarity timescale for the first time. Dinocyst species from the Maastrichtian to earliest Oligocene at Site 1172 are largely endemic ("Transantarctic Flora") or bipolar; cosmopolitan taxa are present in the background as well. The Maastrichtian-early late Eocene dinocyst assemblages are indicative of shallow-marine to restricted marine, pro-deltaic conditions, closely tied to a massive siliciclastic sequence. By middle late Eocene times ( approximately 35.5 Ma), the siliciclastic sequence gave way to a thin glauconitic unit, considered to reflect the deepening of the Tasmanian Gateway. This transition coincides with the most prominent change in dinocyst associations of the Paleogene. The turnover is inferred to reflect a change from marginal marine to more offshore conditions, with increased winnowing and oxidation. Overlying pelagic carbonate ooze of middle early Oligocene and younger age is virtually barren of organic microfossils, although Quaternary assemblages have been recovered. This aspect is taken to reflect average low sedimentation rates and well-oxygenated water masses during most of the Oligocene and Neogene. The few palynologically productive samples from the Oligocene-Quaternary interval have a stronger cosmopolitan to subtropical signature, with warm-water species being common to abundant.
Coverage:
West: 149.5500 East: 149.5600 North: -43.5700 South: -43.5800
Relations:
Expedition: 189
Site: 189-1172
Supplemental Information:
Available only on CD-ROM in PDF format and on the Web in PDF or HTML
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.189.106.2003 (c.f. for more detailed metadata)
Data download: application/pdf
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