Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf
Stable isotopic values on planktonic foraminifera in a suite of cores from basins across the SE Baffin Shelf are used to extract a record of meltwater events during Termination I deglaciation. Resolution and Hatton basins lie on the SE Baffin Shelf at water depths > 500 m, seaward of major condui...
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1991
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.727121 2024-09-15T17:57:07+00:00 Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf Andrews, John T Erlenkeuser, Helmut Evans, L W Briggs, W M Jull, A J Timothy MEDIAN LATITUDE: 61.465729 * MEDIAN LONGITUDE: -62.755594 * SOUTH-BOUND LATITUDE: 60.895000 * WEST-BOUND LONGITUDE: -65.443333 * NORTH-BOUND LATITUDE: 62.766667 * EAST-BOUND LONGITUDE: -59.366667 1991 application/zip, 17 datasets https://doi.pangaea.de/10.1594/PANGAEA.727121 https://doi.org/10.1594/PANGAEA.727121 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.727121 https://doi.org/10.1594/PANGAEA.727121 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Andrews, John T; Erlenkeuser, Helmut; Evans, L W; Briggs, W M; Jull, A J Timothy (1991): Meltwater and deglaciation, SE Baffin Shelf (NE margin Laurentide Ice Sheet) between 13.5 and 7 ka: from O and C isotopic data. Paleoceanography, 6(5), 621-637, https://doi.org/10.1029/91PA01914 Baffin Shelf HU75 HU77-148 HU77-149 HU77-150 HU77-151 HU77-152 HU77-154 HU77-156 HU84-008 PC Piston corer TC Trigger corer dataset publication series 1991 ftpangaea https://doi.org/10.1594/PANGAEA.72712110.1029/91PA01914 2024-07-24T02:31:20Z Stable isotopic values on planktonic foraminifera in a suite of cores from basins across the SE Baffin Shelf are used to extract a record of meltwater events during Termination I deglaciation. Resolution and Hatton basins lie on the SE Baffin Shelf at water depths > 500 m, seaward of major conduits for ice drainage from the eastern sector of the Laurentide Ice Sheet (LIS). Accelerator mass spectrometry 14C dates are used to constrain our chronology of events in ten cores. In Resolution Basin, three cores have 14C AMS dates on foraminifera of > 20 ka at their bases; whereas Hatton Basin cores terminate in sediments < 13 kyr. Sedimentation rates varied between 0.1 to 4.5 m/ka. Stable oxygen and carbon isotopic ratios were obtained on 146 samples of the planktonic foraminifera Neogloboquadrina pachyderma (Ehrenberg) sinistral, from seven of the ten cores. No evidence was found to indicate that test morphology or size affected delta18O. Between 7 and 13.5 ka the surface water on the shelf was on average 1 per mil lower than the open ocean signal. Significant temporal variations were found in both delta18O and delta13C. Evidence for significant low delta18O events occurred between 13 and 8 ka. The delta13C record from the planktonic foraminifera suggests a threefold division of events between 13 and 7 ka, with positive values between 10.8 and 13.0 ka, negative values between 9 and 10.8 ka, and positive values from 7 to 9 ka. The delta18O data suggest the presence of meltwater on the shelf some 3,000 years prior to the first late glacial dates on terrestrial deglaciation (at circa 10.4 ka). "Hudson Strait must be the real key to the importance of the calving process during deglaciation, because it is potentially the largest marine outlet for the Laurentide Ice Sheet and because it leads into the very center of the ice sheet.the rates of calving through Hudson Strait during the period of initial d18O rise unfortunately are unknown." W. F. Ruddiman (1987, p. 151) Other/Unknown Material Baffin Hudson Strait Ice Sheet Neogloboquadrina pachyderma Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-65.443333,-59.366667,62.766667,60.895000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Baffin Shelf HU75 HU77-148 HU77-149 HU77-150 HU77-151 HU77-152 HU77-154 HU77-156 HU84-008 PC Piston corer TC Trigger corer |
spellingShingle |
Baffin Shelf HU75 HU77-148 HU77-149 HU77-150 HU77-151 HU77-152 HU77-154 HU77-156 HU84-008 PC Piston corer TC Trigger corer Andrews, John T Erlenkeuser, Helmut Evans, L W Briggs, W M Jull, A J Timothy Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf |
topic_facet |
Baffin Shelf HU75 HU77-148 HU77-149 HU77-150 HU77-151 HU77-152 HU77-154 HU77-156 HU84-008 PC Piston corer TC Trigger corer |
description |
Stable isotopic values on planktonic foraminifera in a suite of cores from basins across the SE Baffin Shelf are used to extract a record of meltwater events during Termination I deglaciation. Resolution and Hatton basins lie on the SE Baffin Shelf at water depths > 500 m, seaward of major conduits for ice drainage from the eastern sector of the Laurentide Ice Sheet (LIS). Accelerator mass spectrometry 14C dates are used to constrain our chronology of events in ten cores. In Resolution Basin, three cores have 14C AMS dates on foraminifera of > 20 ka at their bases; whereas Hatton Basin cores terminate in sediments < 13 kyr. Sedimentation rates varied between 0.1 to 4.5 m/ka. Stable oxygen and carbon isotopic ratios were obtained on 146 samples of the planktonic foraminifera Neogloboquadrina pachyderma (Ehrenberg) sinistral, from seven of the ten cores. No evidence was found to indicate that test morphology or size affected delta18O. Between 7 and 13.5 ka the surface water on the shelf was on average 1 per mil lower than the open ocean signal. Significant temporal variations were found in both delta18O and delta13C. Evidence for significant low delta18O events occurred between 13 and 8 ka. The delta13C record from the planktonic foraminifera suggests a threefold division of events between 13 and 7 ka, with positive values between 10.8 and 13.0 ka, negative values between 9 and 10.8 ka, and positive values from 7 to 9 ka. The delta18O data suggest the presence of meltwater on the shelf some 3,000 years prior to the first late glacial dates on terrestrial deglaciation (at circa 10.4 ka). "Hudson Strait must be the real key to the importance of the calving process during deglaciation, because it is potentially the largest marine outlet for the Laurentide Ice Sheet and because it leads into the very center of the ice sheet.the rates of calving through Hudson Strait during the period of initial d18O rise unfortunately are unknown." W. F. Ruddiman (1987, p. 151) |
format |
Other/Unknown Material |
author |
Andrews, John T Erlenkeuser, Helmut Evans, L W Briggs, W M Jull, A J Timothy |
author_facet |
Andrews, John T Erlenkeuser, Helmut Evans, L W Briggs, W M Jull, A J Timothy |
author_sort |
Andrews, John T |
title |
Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf |
title_short |
Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf |
title_full |
Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf |
title_fullStr |
Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf |
title_full_unstemmed |
Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf |
title_sort |
age determination and stable isotope record of planktonic foraminifera from sediments of the baffin shelf |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.727121 https://doi.org/10.1594/PANGAEA.727121 |
op_coverage |
MEDIAN LATITUDE: 61.465729 * MEDIAN LONGITUDE: -62.755594 * SOUTH-BOUND LATITUDE: 60.895000 * WEST-BOUND LONGITUDE: -65.443333 * NORTH-BOUND LATITUDE: 62.766667 * EAST-BOUND LONGITUDE: -59.366667 |
long_lat |
ENVELOPE(-65.443333,-59.366667,62.766667,60.895000) |
genre |
Baffin Hudson Strait Ice Sheet Neogloboquadrina pachyderma Planktonic foraminifera |
genre_facet |
Baffin Hudson Strait Ice Sheet Neogloboquadrina pachyderma Planktonic foraminifera |
op_source |
Supplement to: Andrews, John T; Erlenkeuser, Helmut; Evans, L W; Briggs, W M; Jull, A J Timothy (1991): Meltwater and deglaciation, SE Baffin Shelf (NE margin Laurentide Ice Sheet) between 13.5 and 7 ka: from O and C isotopic data. Paleoceanography, 6(5), 621-637, https://doi.org/10.1029/91PA01914 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.727121 https://doi.org/10.1594/PANGAEA.727121 |
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.72712110.1029/91PA01914 |
_version_ |
1810433303971364864 |