CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Andrews, J. T., Erlenkeuser, H., Evans, L. W., Briggs, W. M. and Jull, A. J. T.
Date : 1991
Title : Meltwater and deglaciation, SE Baffin Shelf (NE margin Laurentide Ice Sheet) between 13.5 and 7 ka: From O and C stable isotopic data
Publication : Paleoceanography
Issue : 6:
Page(s) : 621-637
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 super(14)C dates are used to constrain our chronology of events in ten cores. In resolution Basin, three cores have super(14)C 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 sinistral, from seven of the ten cores. Between 7 and 13.5 ka the surface water on the shelf was on average 1 ppt lower than the open ocean signal. Significant temporal variations were found in both partial differential super(18)O and partial differential super(13)C. Evidence for significant low partial differential super(18)O events occurred between 13 and 8 ka. The partial differential super(13)C 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.
Bibliography of Canadian Geomorphology