Deglacial reservoir age and implications, Foxe Peninsula, Baffin Island

• Published in: Journal of Quaternary Science
• Main Authors: Vickers, Kayla J., Ward, Brent C., Utting, Daniel J., Telka, Alice M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2010
• Subjects: Arctic; Baffin Island; Canada; Foxe Basin; Foxe Peninsula; Hudson; Hudson Strait; Baffin; Ice Sheet
• Online Access: http://dx.doi.org/10.1002/jqs.1419; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1419; https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1419

Abstract Marine reservoir age is reported for Foxe Basin, Canada, during deglaciation of the Laurentide Ice Sheet. Radiocarbon ( 14 C) measurements were made on pairs of contemporaneous molluscs and Salix (willow) macrofossils, yielding a mean marine reservoir age of 985 ± 10 14 C a. Mean regional Δ R is calculated to be 615 ± 20 14 C a relative to a mean global reservoir age of ca. 400 14 C a. Previous studies in the Canadian Arctic that have been conducted on modern pre‐bomb molluscs give Δ R values of ca. 100–300 14 C a. The difference between modern and deglacial reservoir ages indicates that Δ R in Foxe Basin has changed over time, which has implications for the reconstruction of past events based on marine 14 C dates. We recalculate the timing of deglaciation of Hudson Strait with this new reservoir age and relate this to the 8.2 cal. ka event. We recommend that local Δ R be determined for the time period being examined whenever possible, and that in cases where this is impossible a Δ R value of 615 14 C a be applied when calibrating marine samples from Foxe Basin and vicinity during deglaciation. Copyright © 2010 John Wiley & Sons, Ltd.