Manicouagan, Canada

Flamini, Enrico; Coletta, Alessandro; Battagliere, Maria Libera; Virelli, Maria

doi:10.1007/978-3-030-05451-9_151

Cited by 1 publication

(2 citation statements)

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“…Construction of the artificial Daniel-Johnson dam in the south of the reservoir between 1962 and 1965 closed the outflow of the two lakes into the Manicouagan River (Manikuakanishtiku, according to Innu toponymy) (Figure 1B). As a result, the lake level rose by ∼140 m and the two lakes were connected, giving the Manicouagan Reservoir an annular shape (Flamini et al, 2019). In this paper, we focus on the eastern crescent-shaped former lake of the reservoir, Lake Manicouagan.…”

Section: Study Area and Settingsmentioning

confidence: 99%

“…The Manicouagan Reservoir is located in northeastern Canada in the subarctic province of Québec ~540 km north‐east of Québec City (Figure 1A). The reservoir is easily identified in satellite photographs due to its annular shape and a diameter of about 65 km (Dence, 1977, Phinney et al, 1978, Flamini et al, 2019). The Manicouagan Reservoir is between 2 and 10 km wide and it completely surrounds the Île‐René‐Levasseur (Figure 1B).…”

Section: Introductionmentioning

confidence: 99%

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Valley morphology and Quaternary seismic stratigraphy of the Manicouagan impact crater lake (Eastern Canada)

Lenz

Gebhardt

Lajeunesse

et al. 2023

J Quaternary Science

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Lakes in formerly glaciated regions can provide valuable paleoclimate archives. Lake Manicouagan (Manikuakan, according to Innu toponymy), formed in the basin of the ~214‐Ma Manicouagan impact crater of eastern Québec, is a key area for reconstructing long‐term environmental change, as it was directly affected by the Pleistocene glaciations and the waxing and waning of the Laurentide Ice Sheet. Here, we present high‐resolution seismic data revealing an overdeepened bedrock valley filled with a sedimentary sequence. We assess its potential to serve as a paleoclimate archive. The varying shape of the overdeepened valley indicates complex erosional processes. A lower narrow V‐shaped gorge is indicative of either pressurized subglacial meltwater or pre‐Quaternary fluvial erosion, or a combination of both. Three scenarios are discussed regarding deposition of the sedimentary sequence: (i) deposition only during and after retreat of the last glacial episode; (ii) deposition during multiple glacial–interglacial cycles; and (iii) deposition mainly during a subglacial lake stage. We suggest subglacial followed by proglacial sedimentation as the most probable scenario for deposition of the sedimentary succession. We recommend considering the sediments of Lake Manicouagan as a paleoclimate archive reaching back at least to 7.5 ka, but the lake also probably contains sediments deposited before the last deglacial period.

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Section: Study Area and Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%