Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes
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...
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1989
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.744822 2023-05-15T16:28:06+02:00 Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes de Vernal, Anne Mudie, Peta J MEDIAN LATITUDE: 55.770300 * MEDIAN LONGITUDE: -46.815550 * SOUTH-BOUND LATITUDE: 53.331300 * WEST-BOUND LONGITUDE: -48.369100 * NORTH-BOUND LATITUDE: 58.209300 * EAST-BOUND LONGITUDE: -45.262000 * DATE/TIME START: 1985-10-04T08:45:00 * DATE/TIME END: 1985-10-23T18:15:00 1989-08-30 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.744822 https://doi.org/10.1594/PANGAEA.744822 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.744822 https://doi.org/10.1594/PANGAEA.744822 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.2973/odp.proc.sr.105.134.1989 105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP Dataset 1989 ftpangaea https://doi.org/10.1594/PANGAEA.744822 https://doi.org/10.2973/odp.proc.sr.105.134.1989 2023-01-20T07:31:53Z 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. Dataset Greenland Labrador Sea North Atlantic Subarctic PANGAEA - Data Publisher for Earth & Environmental Science Greenland ENVELOPE(-48.369100,-45.262000,58.209300,53.331300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP de Vernal, Anne Mudie, Peta J Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes |
topic_facet |
105-646B 105-647A DRILL Drilling/drill rig Joides Resolution Labrador Sea Leg105 North Atlantic Ocean Ocean Drilling Program ODP |
description |
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. |
format |
Dataset |
author |
de Vernal, Anne Mudie, Peta J |
author_facet |
de Vernal, Anne Mudie, Peta J |
author_sort |
de Vernal, Anne |
title |
Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes |
title_short |
Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes |
title_full |
Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes |
title_fullStr |
Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes |
title_full_unstemmed |
Pliocene and Pleistocene palynomorphs in ODP Leg 105 holes |
title_sort |
pliocene and pleistocene palynomorphs in odp leg 105 holes |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.744822 https://doi.org/10.1594/PANGAEA.744822 |
op_coverage |
MEDIAN LATITUDE: 55.770300 * MEDIAN LONGITUDE: -46.815550 * SOUTH-BOUND LATITUDE: 53.331300 * WEST-BOUND LONGITUDE: -48.369100 * NORTH-BOUND LATITUDE: 58.209300 * EAST-BOUND LONGITUDE: -45.262000 * DATE/TIME START: 1985-10-04T08:45:00 * DATE/TIME END: 1985-10-23T18:15:00 |
long_lat |
ENVELOPE(-48.369100,-45.262000,58.209300,53.331300) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Labrador Sea North Atlantic Subarctic |
genre_facet |
Greenland Labrador Sea North Atlantic Subarctic |
op_source |
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, https://doi.org/10.2973/odp.proc.sr.105.134.1989 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.744822 https://doi.org/10.1594/PANGAEA.744822 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.744822 https://doi.org/10.2973/odp.proc.sr.105.134.1989 |
_version_ |
1766017733696159744 |