Deglacial and postglacial evolution of the Pingualuit Crater Lake basin, northern Québec (Canada)

Desiage, Pierre‐Arnaud; Lajeunesse, Patrick; St‐Onge, Guillaume; Normandeau, Alexandre; Ledoux, Grégoire; Guyard, Hervé; Pienitz, Reinhard

doi:10.1016/j.geomorph.2015.07.023

Cited by 6 publications

(4 citation statements)

References 43 publications

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“…This arcuate mound is thus the surface expression of a buried MMD that was triggered during the early to middle Holocene in a glacimarine to marine setting. In general, lakes located within former glacial environments exhibit numerous MMDs dated to deglacial times that are triggered in response to glacio-isostatic rebound [e.g., Beck, 2009;Desiage et al, 2015;Normandeau et al, 2013;Brooks, 2016]. The low abundance of MMDs during glacio-isostatic rebound in the Cape Bounty's lakes is rather surprising but could be attributed to slow postglacial emergence in the region [Nixon et al, 2014] and to insufficient sedimentation rates in the lakes that prevented failure [e.g., Wilhelm et al, 2015].…”

Section: Chronology Of Mass Movementsmentioning

confidence: 99%

Sediment dynamics in paired High Arctic lakes revealed from high‐resolution swath bathymetry and acoustic stratigraphy surveys

et al. 2016

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High Arctic lakes are commonly used for paleoclimatic reconstructions because they are particularly sensitive to climate variability. However, the processes leading to sediment deposition and distribution in these lakes are often poorly understood. Here for the first time in the Canadian High Arctic, we present original data resulting from swath bathymetry and subbottom surveys carried out on two lakes at Cape Bounty, Melville Island. The results reveal the dynamic nature of the lakes, in which mass movement deposits and bedforms on the deltas reflect frequent slope instabilities and hyperpycnal flow activity. The analysis of the mass movement deposits reveals that small blocky debris flows/avalanches, debris flows, and a slide occurred during the Holocene. These mass movements are believed to have been triggered by earthquakes and potentially by permafrost thawing along the shoreline. Altogether, these mass movement deposits cover more than 30% of the lake floors. Additionally, the river deltas on both lakes were mapped and reveal the presence of several gullies and bedforms. The presence of gullies along the delta front indicates that hyperpycnal flows generated at the river mouth can transport sediment in different trajectories downslope, resulting in a different sediment accumulation pattern and record. The dynamic nature of these two lakes suggests that further analysis on sediment transport and distribution within Arctic lakes is required in order to improve paleoclimatic reconstructions.

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Section: Chronology Of Mass Movementsmentioning

confidence: 99%

Sediment dynamics in paired High Arctic lakes revealed from high‐resolution swath bathymetry and acoustic stratigraphy surveys

et al. 2016

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“…Rim dissection and the development of outflow channels have been recognized in volcanic caldera lakes (e.g., Lake Taupo, New Zealand; Manville et al., 1999) and in terrestrial impact structures (Grant & Schultz, 1993; Komatsu et al., 2014), including the Pingualuit Structure in Northern Quebec (Desiage et al., 2015). Grant and Schultz (1993) examined degradation processes at three young terrestrial impact structures (Meteor, Lonar and Talemzane craters) and compared them with selected Martian examples.…”

Section: Discussionmentioning

confidence: 99%

3‐D geophysical modeling of a buried, simple impact crater: Holleford impact structure, Ontario, Canada

Armour,

Boyce,

Shulman

et al. 2023

Meteorit & Planetary Scien

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Holleford Crater is a deeply buried, 2.35 km diameter late Proterozoic‐early Cambrian (550 ± 50 Ma) simple impact crater located in southeastern Ontario, Canada. Exploration drilling in the 1950–60s indicated a >450 m deep, simple impact structure with an infill stratigraphy of Cambro‐Ordovician clastic and carbonate sediments and a −2.2 mGal gravity anomaly. We conducted new ground‐based geophysical surveys (magnetics, gravity) and potential field modeling to better resolve the buried impact structure depth, subsurface geometry, and postimpact modification. Geophysical surveys reveal a well‐defined ~3 mGal Bouguer gravity low and <20 nT residual magnetic anomaly over the crater basin. The lack of a well‐defined magnetic anomaly is due to the low magnetic contrast between Mesoproterozoic metasedimentary target rocks and Paleozoic infill sediments. The modeled basement surface shows a deeply buried (>400 m), eroded simple impact structure with a rim‐to‐rim diameter (D) of 1.8–2 km, a residual rim height of about 30 m and a true depth (dt) >400 m. The modeled diameter is smaller than the previous estimate (2.35 km) based on the surface outcrop pattern of Paleozoic strata, which overestimates the buried impact structure dimensions. The modeled basement surface identifies a rim breach and a possible fluvial outflow channel in the southeast impact structure rim. The channel is up to 150 m deep and 400 m in width and has morphology similar to outlet channels produced by fluvial rim dissection of terrestrial impact structures and “tadpole craters” on Mars.

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“…These paleoclimate archives provide important constraints for climate modeling, in particular for the reconstruction of the behavior of ice sheets during a warming climate. However, the potential of long‐term sedimentary archives in lakes is often constrained by numerous factors such as low sedimentation rates or non‐deposition (Desiage et al, 2015, Lajeunesse et al, 2017), or simply because most lakes worldwide only formed following the end of the last glacial, hence being younger than 20 ka (Kelts 1988). In addition, missing accommodation space, drystand periods (De Cort et al, 2021) or absent sediment preservation in a lake result in a sedimentary hiatus.…”

Section: Introductionmentioning

confidence: 99%

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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Deglacial and postglacial evolution of the Pingualuit Crater Lake basin, northern Québec (Canada)

Cited by 6 publications

References 43 publications

Sediment dynamics in paired High Arctic lakes revealed from high‐resolution swath bathymetry and acoustic stratigraphy surveys

Sediment dynamics in paired High Arctic lakes revealed from high‐resolution swath bathymetry and acoustic stratigraphy surveys

3‐D geophysical modeling of a buried, simple impact crater: Holleford impact structure, Ontario, Canada

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

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