10                        Be dating of former glacial Lake Naskaupi (Québec-Labrador) and timing of its discharges during the last deglaciation

Hugo Dubé-Loubert; Martin Roy; Joerg M. Schaefer; Peter U. Clark

doi:10.1016/j.quascirev.2018.05.008

¹⁰ Be dating of former glacial Lake Naskaupi (Québec-Labrador) and timing of its discharges during the last deglaciation

Hugo Dubé-Loubert
, Martin Roy
, Joerg M. Schaefer
, Peter U. Clark

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

The last deglaciation of the Laurentide Ice Sheet in northern Quebec and Labrador led to the formation of several glacial lakes that drained into Ungava Bay and the nearby Labrador Sea. Assessing the potential impact of their drainage on ocean surface conditions and climate, however, is limited by the few existing age constraints on ice retreat and associated evolution of these lakes. Here we report 21 ¹⁰ Be ages from shorelines and an outburst flood landform formed by Lake Naskaupi, one of the largest glacial lakes in this region. The results indicate that the lake drained from its full extent at 8300 ± 300 a, suggesting that it may have contributed to the freshwater forcing initiated by the drainage of Lake Agassiz-Ojibway that caused the 8.2-ka cold event. Additionally, the results provide important constraints on the position of the ice margin of the Labrador Sector during its retreat across this region.

Original language	English
Pages (from-to)	31-40
Number of pages	10
Journal	Quaternary Science Reviews
Volume	191
Early online date	26 May 2018
DOIs	https://doi.org/10.1016/j.quascirev.2018.05.008
Publication status	Published (in print/issue) - 1 Jul 2018

Funding

Logistical support for this study was obtained through a mapping program of the Ministry of Energy and Natural Resources of Quebec (MENRQ) . Assistance during fieldwork was provided by V. Daubois, S. Hébert, O. Lamarche and I. Randour. Discussions with J. Ives and J. Veillette were greatly appreciated. P.-M. Godbout assisted in the production of PDF graphs. Uplift data were kindly provided by Glenn Milne (U. of Ottawa). Financial support came from MENRQ (HDL, MR), a NSERC Discovery Grant (MR) and the Climate Center of LDEO (JMS, MR) . BCGQ external contribution no. 8449-2017-2018-08. This paper benefited from constructive comments by two anonymous reviewers. Appendix A

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SDG 13 Climate Action

Keywords

8.2-ka cold event
Cosmogenic dating
Glacial lake outburst drainage
Glacial lakes
Labrador sector
Last deglaciation
Laurentide ice sheet

Access to Document

10.1016/j.quascirev.2018.05.008

Cite this

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title = "10 Be dating of former glacial Lake Naskaupi (Qu{\'e}bec-Labrador) and timing of its discharges during the last deglaciation",

abstract = " The last deglaciation of the Laurentide Ice Sheet in northern Quebec and Labrador led to the formation of several glacial lakes that drained into Ungava Bay and the nearby Labrador Sea. Assessing the potential impact of their drainage on ocean surface conditions and climate, however, is limited by the few existing age constraints on ice retreat and associated evolution of these lakes. Here we report 21 10 Be ages from shorelines and an outburst flood landform formed by Lake Naskaupi, one of the largest glacial lakes in this region. The results indicate that the lake drained from its full extent at 8300 ± 300 a, suggesting that it may have contributed to the freshwater forcing initiated by the drainage of Lake Agassiz-Ojibway that caused the 8.2-ka cold event. Additionally, the results provide important constraints on the position of the ice margin of the Labrador Sector during its retreat across this region. ",

keywords = "8.2-ka cold event, Cosmogenic dating, Glacial lake outburst drainage, Glacial lakes, Labrador sector, Last deglaciation, Laurentide ice sheet",

author = "Hugo Dub{\'e}-Loubert and Martin Roy and Schaefer, \{Joerg M.\} and Clark, \{Peter U.\}",

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AU - Dubé-Loubert, Hugo

AU - Roy, Martin

AU - Schaefer, Joerg M.

AU - Clark, Peter U.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - The last deglaciation of the Laurentide Ice Sheet in northern Quebec and Labrador led to the formation of several glacial lakes that drained into Ungava Bay and the nearby Labrador Sea. Assessing the potential impact of their drainage on ocean surface conditions and climate, however, is limited by the few existing age constraints on ice retreat and associated evolution of these lakes. Here we report 21 10 Be ages from shorelines and an outburst flood landform formed by Lake Naskaupi, one of the largest glacial lakes in this region. The results indicate that the lake drained from its full extent at 8300 ± 300 a, suggesting that it may have contributed to the freshwater forcing initiated by the drainage of Lake Agassiz-Ojibway that caused the 8.2-ka cold event. Additionally, the results provide important constraints on the position of the ice margin of the Labrador Sector during its retreat across this region.

AB - The last deglaciation of the Laurentide Ice Sheet in northern Quebec and Labrador led to the formation of several glacial lakes that drained into Ungava Bay and the nearby Labrador Sea. Assessing the potential impact of their drainage on ocean surface conditions and climate, however, is limited by the few existing age constraints on ice retreat and associated evolution of these lakes. Here we report 21 10 Be ages from shorelines and an outburst flood landform formed by Lake Naskaupi, one of the largest glacial lakes in this region. The results indicate that the lake drained from its full extent at 8300 ± 300 a, suggesting that it may have contributed to the freshwater forcing initiated by the drainage of Lake Agassiz-Ojibway that caused the 8.2-ka cold event. Additionally, the results provide important constraints on the position of the ice margin of the Labrador Sector during its retreat across this region.

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