Age determinations of sediment cores from the Baffin Shelf ...

• Main Authors: Andrews, John T, Evans, L W, Williams, Kerstin M, Briggs, W M, Jull, A J Timothy, Erlenkeuser, Helmut, Hardy, Iris A
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1990
• Subjects: Piston corer; Briggs; Northwest Territories; Baffin; Ice Sheet; Labrador Sea; Planktonic foraminifera; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.727068; https://doi.pangaea.de/10.1594/PANGAEA.727068

Cores HU82-034-057 and HU84-035-008, Resolution Basin, SE Baffin Shelf, contain 200 and 450 cm, respectively, of sediment that spans the Younger Dryas chron. In both cores the interval is bracketed by 14C dates on foraminifera or molluscs. These sites were close to the margin of the late Wisconsin (Foxe) ice sheet as it flowed toward the Labrador Sea. Prior to 11 ka, both cores record moderate to high accumulations of foraminifera, relatively high del 18O values in planktonic foraminifera, and low values of detrital carbonate. The diatom and percent opal records imply occasional seasonally open water conditions. During part of the Younger Dryas chron both the diatom and opal analyses imply a shutoff of biogenic silica production, suggesting surface water conditions affected by increased sea ice and/or reduced nutrients. In addition, the Younger Dryas interval is marked by an increase in coarse sand and detrital carbonate, a decrease in total organic carbon and foraminifera, and high rates of sediment ... : Supplement to: Andrews, John T; Evans, L W; Williams, Kerstin M; Briggs, W M; Jull, A J Timothy; Erlenkeuser, Helmut; Hardy, Iris A (1990): Cryosphere/ocean interactions at the margin of the Laurentide ice sheet during the Younger Dryas chron: SE Baffin Shelf, Northwest Territories. Paleoceanography, 5(6), 921-935 ...