10.1594/PANGAEA.744822
de Vernal, Anne
Anne
de Vernal
0000-0001-5656-724X
Mudie, Peta J
Peta J
Mudie
Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes
PANGAEA
1989
Drilling/drill rig
Leg105
Joides Resolution
Ocean Drilling Program (ODP)
1985-10-04T08:45:00/1985-10-23T18:15:00
en
Supplementary Publication Series of Datasets
10.2973/odp.proc.sr.105.134.1989
2 datasets
application/zip
Creative Commons Attribution 3.0 Unported
Pliocene and Pleistocene sediments from ODP Hole 647A in the south central Labrador Sea and Hole 646B off southwest Greenland were sampled at 1.5-m intervals for studies of terrestrial and marine palynomorphs, including pollen, spores, dinocysts, and acritarchs. The dinocyst assemblages suggest that surface-water masses were cool-temperate to subarctic during most of the Pliocene and Pleistocene. The occurrence of a few warm-temperate indicators, notably Impagidinium species and Polyspaeridium zoharyi, suggests almost continuous northward advection of warm North Atlantic Drift into the Labrador Sea. A major decrease in dinocyst diversity and abundance marks the late Pliocene to early Pleistocene interval. The abundance of acritarchs in Pliocene sediments off southwest Greenland suggests high productivity, which may reflect nutrient flux from the shelf or upwelling; productivity appears to have been much lower at the central Labrador Sea site. Pollen and spore concentrations also decrease from the late Pliocene to early Pleistocene. This diminution probably reflects the impoverishment of vegetation and southward migration of the eastern Canadian tree line at the onset of climatic cooling and glaciation.
Supplement to: de Vernal, Anne; Mudie, Peta J (1989): Pliocene and Pleistocene palynostratigraphy at ODP Sites 646 and 647, eastern and southern Labrador Sea. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 401-422
-48.3691
-45.262
53.3313
58.2093
Labrador Sea
South Atlantic Ocean