EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

10Be dating Cordilleran-Laurentide ice-sheet separation during the last deglaciation

Jorie Clark1, Anders Carlson2, Alberto Reyes3, and Glenn Milne4
Jorie Clark et al.
  • 1CEOAS, Oregon State University, United States of America (
  • 2Carlson Climate Consulting, Corvallis, United States of America (
  • 3University of Alberta, Edmonton, Canada (
  • 4University of Ottawa, Ottawa, Canada (

During the last glacial maximum, the Cordilleran and Laurentide ice sheets met just to the east of the Canadian Rocky Mountains, forming an ice-sheet saddle. When this saddle disappeared has implications on deglacial global sea-level rise and abrupt climate change as well as human migration patterns to the Americas. We will present new 10-Be boulder ages from six sites on a ~1100 km transect along the ice-sheet suture zone, to date Cordilleran-Laurentide ice-sheet separation. Results will directly test whether or not Cordilleran-Laurentide separation contributed to abrupt sea-level rise during meltwater pulse 1a (14.6-14.3 ka) in response to abrupt Bølling warming (14.6-14.0 ka).

How to cite: Clark, J., Carlson, A., Reyes, A., and Milne, G.: 10Be dating Cordilleran-Laurentide ice-sheet separation during the last deglaciation, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12713,, 2020