Rapid retreat of the southwestern Laurentide Ice Sheet during the Bolling-Allerod interval
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10449372" target="_blank" >RIV/00216208:11310/22:10449372 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uFZJVUz1UR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uFZJVUz1UR</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1130/G49493.1" target="_blank" >10.1130/G49493.1</a>
Alternative languages
Result language
angličtina
Original language name
Rapid retreat of the southwestern Laurentide Ice Sheet during the Bolling-Allerod interval
Original language description
The timing of Laurentide Ice Sheet deglaciation along its southwestern margin controlled the evolution of large glacial lakes and has implications for human migration into the Americas. Accurate reconstruction of the ice sheet's retreat also constrains glacial isostatic adjustment models and is important for understanding ice-sheet sensitivity to climate forcing. Despite its significance, retreat of the southwestern Laurentide Ice Sheet (SWLIS) is poorly constrained by minimum-limiting C-14 data. We present 26 new cosmogenic Be-10 exposure ages spanning the western Interior Plains, Canada. Using a Bayesian framework, we combine these data with geomorphic mapping, Be-10, and high-quality minimum-limiting C-14 ages to provide an updated chronology. This dataset presents an internally consistent retreat record and indicates that the initial detachment of the SWLIS from its convergence with the Cordilleran Ice Sheet began by ca. 15.0 ka, concurrent with or slightly prior to the onset of the Bolling-Allerod interval (14.7-12.9 ka) and retreated >1200 km to its Younger Dryas (YD) position in similar to 2500 yr. Ice-sheet stabilization at the Cree Lake Moraine facilitated a meltwater drainage route to the Arctic from glacial Lake Agassiz within the YD, but not necessarily at the beginning. Our record of deglaciation and new YD constraints demonstrate deglaciation of the Interior Plains was similar to 60% faster than suggested by minimum C-14 constraints alone. Numerical modeling of this rapid retreat estimates a loss of similar to 3.7 m of sea-level equivalent from the SWLIS during the Bolling-Allerod interval.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10508 - Physical geography
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geology
ISSN
0091-7613
e-ISSN
1943-2682
Volume of the periodical
50
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
5
Pages from-to
417-421
UT code for WoS article
000775048900007
EID of the result in the Scopus database
2-s2.0-85122268559