Isotopic and micropaleontological record of sediments of the Baffin Bay
The oxygen and carbon isotopic compositions of the planktonic foraminifer, Neogloboquadrina pachyderma (sinistral), were determined at 20-cm intervals through the 'composite' top ~ 22 m of sediments at ODP Site 645 (Holes 645B, 645C, 645F, and 645G) and at 10-cm intervals through a 9-m pis...
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1989
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.744850 2024-09-15T17:56:56+00:00 Isotopic and micropaleontological record of sediments of the Baffin Bay Hillaire-Marcel, Claude de Vernal, Anne Aksu, Ali E Macko, Stephen A MEDIAN LATITUDE: 70.539118 * MEDIAN LONGITUDE: -64.583372 * SOUTH-BOUND LATITUDE: 70.457000 * WEST-BOUND LONGITUDE: -64.654800 * NORTH-BOUND LATITUDE: 71.333300 * EAST-BOUND LONGITUDE: -64.266700 * DATE/TIME START: 1985-09-03T00:00:00 * DATE/TIME END: 1985-09-28T00:00:00 1989 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.744850 https://doi.org/10.1594/PANGAEA.744850 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.744850 https://doi.org/10.1594/PANGAEA.744850 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Hillaire-Marcel, Claude; de Vernal, Anne; Aksu, Ali E; Macko, Stephen A (1989): High-resolution isotopic and micropaleontological studies of Upper Pleistocene sediments at ODP Site 645, Baffin Bay. 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, 599-616, https://doi.org/10.2973/odp.proc.sr.105.138.1989 105-645 Baffin Bay COMPCORE Composite Core HUD76-029-033 HUD85-027-16 HUD85-027-16TC Hudson Bay Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP PC Piston corer TC Trigger corer dataset publication series 1989 ftpangaea https://doi.org/10.1594/PANGAEA.74485010.2973/odp.proc.sr.105.138.1989 2024-07-24T02:31:20Z The oxygen and carbon isotopic compositions of the planktonic foraminifer, Neogloboquadrina pachyderma (sinistral), were determined at 20-cm intervals through the 'composite' top ~ 22 m of sediments at ODP Site 645 (Holes 645B, 645C, 645F, and 645G) and at 10-cm intervals through a 9-m piston core (85-027-016) collected during the Hudson site survey. Quantitative analyses of palynomorphs, notably dinocysts, and of planktonic foraminifers were performed. Organic and nitrogen contents and isotopic composition of nitrogen and carbon in organic matter also were determined. These data provide a high-resolution record of changes that occurred in surface-water masses during the last glacial cycle in Baffin Bay. The basin experienced low planktonic productivity during most of the late Pleistocene, either from dilution in surface water by meltwater discharges from the surrounding ice-sheet or from the presence of a relatively dense sea-ice cover. Peaks of meltwater discharge are indicated by d18O values as low as about 1.5 per mil, correlative d13C- d18O shifts, low concentration of planktonic foraminifers, high concentrations of glacially reworked pre-Quaternary palynomorphs, and low-salinity dinocyst assemblages. As a whole, d18O values ranging between 4.5 and 2.5 per mil allow the establishment of an 18O stratigraphy spanning isotopic stages 5 to 1. Because of the poor core recovery, the general paucity of microflora and microfauna, and the possible occurrence of slumping or debris flow at Site 645, further interpretation remains problematic. Other/Unknown Material Baffin Bay Baffin Bay Baffin Hudson Bay Ice Sheet Labrador Sea Neogloboquadrina pachyderma Sea ice PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-64.654800,-64.266700,71.333300,70.457000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
105-645 Baffin Bay COMPCORE Composite Core HUD76-029-033 HUD85-027-16 HUD85-027-16TC Hudson Bay Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP PC Piston corer TC Trigger corer |
spellingShingle |
105-645 Baffin Bay COMPCORE Composite Core HUD76-029-033 HUD85-027-16 HUD85-027-16TC Hudson Bay Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP PC Piston corer TC Trigger corer Hillaire-Marcel, Claude de Vernal, Anne Aksu, Ali E Macko, Stephen A Isotopic and micropaleontological record of sediments of the Baffin Bay |
topic_facet |
105-645 Baffin Bay COMPCORE Composite Core HUD76-029-033 HUD85-027-16 HUD85-027-16TC Hudson Bay Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP PC Piston corer TC Trigger corer |
description |
The oxygen and carbon isotopic compositions of the planktonic foraminifer, Neogloboquadrina pachyderma (sinistral), were determined at 20-cm intervals through the 'composite' top ~ 22 m of sediments at ODP Site 645 (Holes 645B, 645C, 645F, and 645G) and at 10-cm intervals through a 9-m piston core (85-027-016) collected during the Hudson site survey. Quantitative analyses of palynomorphs, notably dinocysts, and of planktonic foraminifers were performed. Organic and nitrogen contents and isotopic composition of nitrogen and carbon in organic matter also were determined. These data provide a high-resolution record of changes that occurred in surface-water masses during the last glacial cycle in Baffin Bay. The basin experienced low planktonic productivity during most of the late Pleistocene, either from dilution in surface water by meltwater discharges from the surrounding ice-sheet or from the presence of a relatively dense sea-ice cover. Peaks of meltwater discharge are indicated by d18O values as low as about 1.5 per mil, correlative d13C- d18O shifts, low concentration of planktonic foraminifers, high concentrations of glacially reworked pre-Quaternary palynomorphs, and low-salinity dinocyst assemblages. As a whole, d18O values ranging between 4.5 and 2.5 per mil allow the establishment of an 18O stratigraphy spanning isotopic stages 5 to 1. Because of the poor core recovery, the general paucity of microflora and microfauna, and the possible occurrence of slumping or debris flow at Site 645, further interpretation remains problematic. |
format |
Other/Unknown Material |
author |
Hillaire-Marcel, Claude de Vernal, Anne Aksu, Ali E Macko, Stephen A |
author_facet |
Hillaire-Marcel, Claude de Vernal, Anne Aksu, Ali E Macko, Stephen A |
author_sort |
Hillaire-Marcel, Claude |
title |
Isotopic and micropaleontological record of sediments of the Baffin Bay |
title_short |
Isotopic and micropaleontological record of sediments of the Baffin Bay |
title_full |
Isotopic and micropaleontological record of sediments of the Baffin Bay |
title_fullStr |
Isotopic and micropaleontological record of sediments of the Baffin Bay |
title_full_unstemmed |
Isotopic and micropaleontological record of sediments of the Baffin Bay |
title_sort |
isotopic and micropaleontological record of sediments of the baffin bay |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.744850 https://doi.org/10.1594/PANGAEA.744850 |
op_coverage |
MEDIAN LATITUDE: 70.539118 * MEDIAN LONGITUDE: -64.583372 * SOUTH-BOUND LATITUDE: 70.457000 * WEST-BOUND LONGITUDE: -64.654800 * NORTH-BOUND LATITUDE: 71.333300 * EAST-BOUND LONGITUDE: -64.266700 * DATE/TIME START: 1985-09-03T00:00:00 * DATE/TIME END: 1985-09-28T00:00:00 |
long_lat |
ENVELOPE(-64.654800,-64.266700,71.333300,70.457000) |
genre |
Baffin Bay Baffin Bay Baffin Hudson Bay Ice Sheet Labrador Sea Neogloboquadrina pachyderma Sea ice |
genre_facet |
Baffin Bay Baffin Bay Baffin Hudson Bay Ice Sheet Labrador Sea Neogloboquadrina pachyderma Sea ice |
op_source |
Supplement to: Hillaire-Marcel, Claude; de Vernal, Anne; Aksu, Ali E; Macko, Stephen A (1989): High-resolution isotopic and micropaleontological studies of Upper Pleistocene sediments at ODP Site 645, Baffin Bay. 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, 599-616, https://doi.org/10.2973/odp.proc.sr.105.138.1989 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.744850 https://doi.org/10.1594/PANGAEA.744850 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.74485010.2973/odp.proc.sr.105.138.1989 |
_version_ |
1810433134994391040 |