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Andrews, John T; Erlenkeuser, Helmut; Evans, L W; Briggs, W M; Jull, A J Timothy (1991): Age determination and stable isotope record of planktonic foraminifera from sediments of the Baffin Shelf. PANGAEA, https://doi.org/10.1594/PANGAEA.727121, Supplement to: Andrews, JT et al. (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

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Abstract:
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)
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
Event(s):
HU75 * Latitude: 62.766660 * Longitude: -59.366660 * Elevation: -1057.0 m * Recovery: 6.8 m * Location: Baffin Shelf * Device: Piston corer (PC) * Comment: do not use, doublette HU75-58. Cannot be deleted because of parent set
HU77-148 * Elevation Start: -307.0 m * Elevation End: 0.0 m * Recovery: 1.54 m * Device: Piston corer (PC) * Comment: Position not given
HU77-149 * Latitude: 61.465000 * Longitude: -60.411667 * Elevation: -1317.0 m * Recovery: 1.71 m * Location: Baffin Shelf * Device: Trigger corer (TC)
Size:
17 datasets

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Datasets listed in this publication series

  1. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 2) Age determination of sediment core HU75-58. https://doi.org/10.1594/PANGAEA.55400
  2. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 2) Age determination of sediment core HU77-149. https://doi.org/10.1594/PANGAEA.713011
  3. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 2) Age determination of sediment core HU77-151. https://doi.org/10.1594/PANGAEA.713013
  4. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 2) Age determination of sediment core HU77-152. https://doi.org/10.1594/PANGAEA.713014
  5. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 2) Age determination of sediment core HU77-154. https://doi.org/10.1594/PANGAEA.713015
  6. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 2) Age determination of sediment core HU77-156. https://doi.org/10.1594/PANGAEA.713016
  7. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 2) Age determinations on sediment core HU77-150. https://doi.org/10.1594/PANGAEA.358363
  8. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU77-148. https://doi.org/10.1594/PANGAEA.358378
  9. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU77-149. https://doi.org/10.1594/PANGAEA.358379
  10. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU77-150. https://doi.org/10.1594/PANGAEA.358380
  11. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU77-151. https://doi.org/10.1594/PANGAEA.358381
  12. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU77-152. https://doi.org/10.1594/PANGAEA.358382
  13. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU77-154. https://doi.org/10.1594/PANGAEA.358383
  14. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU77-156. https://doi.org/10.1594/PANGAEA.358384
  15. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table 3) Stable isotope ratios of Neogloboquadrina pachyderma from sediment core HU84-008. https://doi.org/10.1594/PANGAEA.358385
  16. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table A1) Comparison of stable isotopic values for Neogloboquadrina pachyderma from sediment core HU84-008. https://doi.org/10.1594/PANGAEA.727118
  17. Andrews, JT; Erlenkeuser, H; Evans, LW et al. (1991): (Table A2) Comparison of stable isotopic values of Neogloboquadrina pachyderma from sediment core HU77-151. https://doi.org/10.1594/PANGAEA.727119