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170 years and for the Labrador Shelf and adjacent areas
140 ± 73 years [Hillaire-Marcel et al., 2007]. Lewis et al.
[2009] have concurred with the suggestion of Hillaire-
Marcel et al. [2007] that, along the Labrador margin and
Newfoundland margins, the
Δ
R may range from 200 to 300
years, depending on the duration of the sea ice cover.
data resolution since Rashid et al. [2003a] have allowed us to
confidently identify H0 in cores Hu97-16 and Hu97-09 on
the basis of bracketing radiocarbon ages, high carbonate,
increase in IRD, and sedimentary structures (Figures 2 and
3). Three ages of 11.99, 13.02, and 12.96 ka bracket H0 in
core Hu97-09, whereas a basal date of 13.25 ka at 461 cm
and a date of 11.14 ka at 301 cm allowed us to clearly
identify H0 in Hu97-16. The sedimentological features of
H0 are similar to those described by Rashid et al. [2003a]
from H1 and H2. At the base of H0 is a 10 to 30 cm thick
sediment unit exhibiting a gradual upward increase in ran-
domly oriented dropstones in hemipelagic sediments. The
middle unit comprises sediments similar to those interpreted
as nepheloid-flow deposits by Rashid et al. [2003a], which
4. RESULTS
4.1. H0 Records Seaward of Hudson Strait
On the continental slope immediately south of the mouth
of the Hatton Basin transverse trough, a thick H0 bed is
present in two cores. New
14
C-AMS dates and increases in
Figure 2.
Core Hu97-16 from the slope seaward of Hudson Strait, with down-core plots of (a) sediment facies,
(b) carbonate (%), (c)
18
OinNeogloboquadrina pachyderma (s), and (d)
14
C-AMS (ka) versus depth (m). It was
collected from 1085 m water depth. The
14
C-AMS dates were used to constrain the age model and were converted to
calendar years (B.P.) using the CALIB 6.0.1 program [Reimer et al., 2009] (see text for details). Horizontal gray bars
represent H0, H1, and H2 events [Rashid et al., 2003a]. LGM is Last Glacial Maximum.
δ
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