scholarly journals Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

Boreas ◽  
2017 ◽  
Vol 47 (1) ◽  
pp. 271-296 ◽  
Author(s):  
Mark F. A. Furze ◽  
Anna J. Pieńkowski ◽  
Morgan A. McNeely ◽  
Robbie Bennett ◽  
Alix G. Cage
Keyword(s):  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet ◽  
Ice Shelf

scholarly journals Routing of meltwater from the Laurentide Ice Sheet during the Younger Dryas cold episode

Nature ◽  
1989 ◽  
Vol 341 (6240) ◽  
pp. 318-321 ◽  
Author(s):  
Wallace S. Broecker ◽  
James P. Kennett ◽  
Benjamin P. Flower ◽  
James T. Teller ◽  
Sue Trumbore ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet ◽  
Cold Episode

scholarly journals Younger Dryas Interval and outflow from the Laurentide Ice Sheet

2000 ◽  
Vol 15 (1) ◽  
pp. 4-18 ◽  
Author(s):  
T. C. Moore ◽  
J. C. G. Walker ◽  
D. K. Rea ◽  
C. F. M. Lewis ◽  
L. C. K. Shane ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet

scholarly journals Calving Bay dynamics and ice sheet retreat up the St. Lawrence Valley system

2011 ◽  
Vol 31 (3-4) ◽  
pp. 347-356 ◽  
Author(s):  
R. H. Thomas
Keyword(s):  
Continental Shelf ◽  
Ice Sheet ◽  
Lake Ontario ◽  
Complete Removal ◽  
Laurentide Ice Sheet ◽  
Ice Shelf ◽  
Ice Streams ◽  
Geological Evidence ◽  
Grounding Line ◽  
Flow Through

Ice streams that drain marine ice sheets are particularly susceptible to catastrophic retreat because they flow through bedrock troughs, and grounding line migration would produce a calving bay filled either with an ice shelf or with icebergs. Geological evidence suggests that a calving bay formed in the Laurentian Channel and the St. Lawrence valley after the late-Wisconsin maximum. Retreat rates in this calving bay are calculated for a variety of possible models assuming that locally the late-Wisconsin Laurentide ice sheet extended to the edge of the continental shelf. If an ice shelf forms in front of the retreating grounding line, and the shear stress between the ice shelf and its margins is one bar, retreat continues for only 150 km. Further retreat requires lubrication by ice with a strain-dependent preferred crystal fabric that develops between the ice shelf and its sides, or by complete removal of the ice shelf. Under these conditions the first 300 km of retreat takes at least 3000 to 6000 years. Thereafter, further retreat is rapid until, if a lubricated ice shelf is present, a new equilibrium grounding line is established about 1100 km from the edge of the continental shelf. If massive calving of icebergs occurred at, or near the grounding line, then retreat would continue up the St. Lawrence valley through to Lake Ontario. Of the various models considered, the minimum time taken for retreat from a point 300 km inland from the edge of the continental shelf through to Lake Ontario is about 2000 years.

Environment and paleoecology of a 12 ka mid-North American Younger Dryas forest chronicled in tree rings

2008 ◽  
Vol 70 (3) ◽  
pp. 433-441 ◽  
Author(s):  
Irina P. Panyushkina ◽  
Steven W. Leavitt ◽  
Todd A. Thompson ◽  
Allan F. Schneider ◽  
Todd Lange
Keyword(s):  
Tree Ring ◽  
Lake Michigan ◽  
Black Spruce ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet ◽  
Tree Ring Chronology ◽  
Water And Sediment ◽  
Ice Floes ◽  
Insight Into

AbstractUntil now, availability of wood from the Younger Dryas abrupt cooling event (YDE) in N. America ca. 12.9 to 11.6 ka has been insufficient to develop high-resolution chronologies for refining our understanding of YDE conditions. Here we present a multi-proxy tree-ring chronology (ring widths, “events” evidenced by microanatomy and macro features, stable isotopes) from a buried black spruce forest in the Great Lakes area (Liverpool East site), spanning 116 yr at ca. 12,000 cal yr BP. During this largely cold and wet period, the proxies convey a coherent and precise forest history including frost events, tilting, drowning and burial in estuarine sands as the Laurentide Ice Sheet deteriorated. In the middle of the period, a short mild interval appears to have launched the final and largest episode of tree recruitment. Ultimately the tops of the trees were sheared off after death, perhaps by wind-driven ice floes, culminating an interval of rising water and sediment deposition around the base of the trees. Although relative influences of the continental ice sheet and local effects from ancestral Lake Michigan are indeterminate, the tree-ring proxies provide important insight into environment and ecology of a N. American YDE boreal forest stand.

scholarly journals Correction to “Cryosphere/Ocean Interactions at the Margin of the Laurentide Ice Sheet during the Younger Dryas Chron: SE Baffin Shelf, Northwest Territories”

1991 ◽  
Vol 6 (2) ◽  
pp. 291-291 ◽  
Author(s):  
J. T. Andrews ◽  
L. W. Evans ◽  
K. M. Williams ◽  
W. M. Briggs ◽  
A. J. T. Jull ◽  
...  
Keyword(s):  
Northwest Territories ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet

scholarly journals Beryllium-10 dating of the Foothills Erratics Train in Alberta, Canada, indicates detachment of the Laurentide Ice Sheet from the Rocky Mountains at ~15 ka

2019 ◽  
Vol 92 (2) ◽  
pp. 469-482 ◽  
Author(s):  
Martin Margold ◽  
John C. Gosse ◽  
Alan J. Hidy ◽  
Robin J. Woywitka ◽  
Joseph M. Young ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Rocky Mountain ◽  
Laurentide Ice Sheet ◽  
Exposure Dating ◽  
Mountain Front ◽  
Ice Retreat ◽  
Cordilleran Ice Sheet ◽  
Latitudinal Trend

AbstractThe Foothills Erratics Train consists of large quartzite blocks of Rocky Mountains origin deposited on the eastern slopes of the Rocky Mountain Foothills in Alberta between ~53.5°N and 49°N. The blocks were deposited in their present locations when the western margin of the Laurentide Ice Sheet (LIS) detached from the local ice masses of the Rocky Mountains, which initiated the opening of the southern end of the ice-free corridor between the Cordilleran Ice Sheet and the LIS. We use 10Be exposure dating to constrain the beginning of this decoupling. Based on a group of 12 samples well-clustered in time, we date the detachment of the western LIS margin from the Rocky Mountain front to ~14.9 ± 0.9 ka. This is ~1000 years later than previously assumed, but a lack of a latitudinal trend in the ages over a distance of ~500 km is consistent with the rapid opening of a long wedge of unglaciated terrain portrayed in existing ice-retreat reconstructions. A later separation of the western LIS margin from the mountain front implies higher ice margin–retreat rates in order to meet the Younger Dryas ice margin position near the boundary of the Canadian Shield ~2000 years later.

Cryosphere/ocean interactions at the margin of the Laurentide Ice Sheet during the Younger Dryas Chron: SE Baffin Shelf, northwest Territories

1990 ◽  
Vol 5 (6) ◽  
pp. 921-935 ◽  
Author(s):  
J. T. Andrews ◽  
L. W. Evans ◽  
K. M. Williams ◽  
W. M. Briggs ◽  
A. J. T. Jull ◽  
...  
Keyword(s):  
Northwest Territories ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet
Sign in / Sign up

Export Citation Format

Share Document