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 |
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Pages (from-to) | 31-40 |
Number of pages | 10 |
Journal | Quaternary Science Reviews |
Volume | 191 |
Early online date | 26 May 2018 |
DOIs | |
Publication status | Published (in print/issue) - 1 Jul 2018 |
Keywords
- 8.2-ka cold event
- Cosmogenic dating
- Glacial lake outburst drainage
- Glacial lakes
- Labrador sector
- Last deglaciation
- Laurentide ice sheet