High-resolution multichannel seismic profiles from Lake Manicouagan, Canada ...

• Main Authors: Lenz, Kai-Frederik, Gebhardt, Catalina, Lajeunesse, Patrick, Lohrberg, Arne, Gross, Felix, Krastel, Sebastian
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Canada; glacial geomorphology; high-resolution reflection seismic; Lake Manicouagan; Laurentide Ice Sheet; paleoclimate archive; subglacial lake; Event label; Date/Time of event; Latitude of event; Longitude of event; Date/Time of event 2; Latitude of event 2; Longitude of event 2; Binary Object; Binary Object File Size; Seismic reflection profile; Lake_Manic; Louis-Edmond-Hamelin; Ice Sheet
• Online Access: https://dx.doi.org/10.1594/pangaea.946132; https://doi.pangaea.de/10.1594/PANGAEA.946132

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: deposition only during and after retreat of the last glacial episode; (ii) deposition during multiple glacial–interglacial cycles; ...