A model for the demise of large, glacial Lake Ojibway, Ontario and Quebec

Stroup, Justin S.; Lowell, Thomas V.; Breckenridge, Andy

doi:10.1007/s10933-013-9707-9

Cited by 18 publications

(22 citation statements)

References 32 publications

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“…However, this interpretation is difficult to fully reconcile with the δ 18 O results obtained (discussed below), whereas other factors may explain the increase in detrital carbonate of the silt bed. Stroup et al 2013). Carbonate minerals and rocks are ultimately broken down to silt-size particles through the process of glacial comminution that takes place during glacial erosion and transport (cf.…”

Section: Discussionmentioning

confidence: 99%

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The drainage of Lake Ojibway in glaciolacustrine sediments of northern Ontario and Quebec, Canada

Daubois

Roy

Veillette

et al. 2014

Boreas

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Physical evidence for the drainage of glacial lakes remains relatively rare in depositional records, giving rise to much debate on the location of outlets and discharge pathways, as well as on the climate impact of the attendant meltwater forcing. Lake Ojibway developed following the withdrawal of the Laurentide Ice Sheet in northern Ontario and Quebec, Canada. The late-stage evolution of this large ice-dammed lake was influenced by the complex dynamics of the retreating ice margin, which highly complicates the identification of the termination of Lake Ojibway in glaciolacustrine sediment records. Here, we document the composition of sections of rhythmites that contain in their upper part an anomalously thick and whitish bed (10-15 cm) that is in turn overlain by ∼1 m of faintly bedded rhythmites. Grain-size analyses showed that the thick whitish bed consists primarily of fine to coarse silt (2-63 μm), contrasting with the lower and upper rhythmites that are largely dominated by clay (<2 μm). The detrital carbonate content of the thick silt bed is characterized by consistently high values (2.5 to 2.8%), whereas the bounding rhythmites show lower and highly variable values. Oxygen isotope measurements further show a marked change going from typical glacial meltwater values (∼ −29.6 to −27.7‰; VSMOW) for the lower rhythmites and the silt bed to modern-like meteoric values (−18.4 to −14.6‰) for the uppermost rhythmites. These data suggest that this marker bed may be associated with a major drawdown event that possibly corresponds to the final drainage of Lake Ojibway. AMS radiocarbon dating of ostracods extracted from the drainage bed also documents an important hardwater effect within the Ojibway basin.

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Section: Discussionmentioning

confidence: 99%

“…Stroup et al (2013) associated the disappearance of the lake to a marked compositional change in sediment cores of northeastern Ontario that show a transition from Ojibway sedimentation to the sudden onset of postglacial lake deposition. ice margin prior to the lake drainage.…”

Section: Background On Lake Ojibwaymentioning

confidence: 99%

The drainage of Lake Ojibway in glaciolacustrine sediments of northern Ontario and Quebec, Canada

Daubois

Roy

Veillette

et al. 2014

Boreas

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“…11. et al, 2012). The second was the 8.2 ka complete drainage of Lake Agassiz-Ojibway (Barber et al, 1999;Breckenridge et al, 2012;Stroup et al, 2013) that is associated with collapse of the Laurentide Ice Sheet saddle that connected the Keewatin and Québec-Labrador domes (Gregoire et al, 2012). High carbonate concentrations and low δ 18 O in sediments indicate consistent high discharge, even between these events, from the start of the Noble Inlet Advance at 9.7 ka until ∼ 8.0 ka .…”

Section: Drainage Histories By Rivermentioning

confidence: 99%

“…Notes on the geologic record can be found in Fig. 11. ridge et al, 2012), and 8.2 ka, when the ice saddle in Hudson Bay collapsed, causing a massive flood that resulted in seasurface freshening and the brief cooling of the 8.2 ka event (Barber et al, 1999;Roy et al, 2011;Hoffman et al, 2012;Gregoire et al, 2012;Breckenridge et al, 2012;Stroup et al, 2013). While this ended meltwater inputs to the Saint Lawrence River, meltwater from the Québec-Labrador dome flowed down the Manicouagan River and into the Gulf of Saint Lawrence until ∼ 7.8 ka (Occhietti et al, 2004).…”

Section: Drainage Histories By Rivermentioning

confidence: 99%

“…ICE-3G has altogether too much ice retreat. ICE-5G, ICE-6G, and ANU have a drainage divide that splits the east-west Saint Lawrence drainage basin, which at this time extended west to the Canadian Rockies (Teller and Leverington, 2004;Breckenridge et al, 2012;Stroup et al, 2013). G12 has this continuous drainage basin, but instead of flowing into the Saint Lawrence River, water in its drainage reconstruction flows to the Arctic Ocean via a gap at the Manitoba-Saskatchewan border along the southwestern corner of the retreating ice sheet (Fig.…”

Section: Comparison Of Data and Models For Drainage Basin Extentsmentioning

confidence: 99%

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Reconstruction of North American drainage basins and river discharge since the Last Glacial Maximum

Wickert

2016

Earth Surf. Dynam.

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Abstract. Over the last glacial cycle, ice sheets and the resultant glacial isostatic adjustment (GIA) rearranged river systems. As these riverine threads that tied the ice sheets to the sea were stretched, severed, and restructured, they also shrank and swelled with the pulse of meltwater inputs and time-varying drainage basin areas, and sometimes delivered enough meltwater to the oceans in the right places to influence global climate. Here I present a general method to compute past river flow paths, drainage basin geometries, and river discharges, by combining models of past ice sheets, glacial isostatic adjustment, and climate. The result is a time series of synthetic paleohydrographs and drainage basin maps from the Last Glacial Maximum to present for nine major drainage basins -the Mississippi, Rio Grande, Colorado, Columbia, Mackenzie, Hudson Bay, Saint Lawrence, Hudson, and Susquehanna/Chesapeake Bay. These are based on five published reconstructions of the North American ice sheets. I compare these maps with drainage reconstructions and discharge histories based on a review of observational evidence, including river deposits and terraces, isotopic records, mineral provenance markers, glacial moraine histories, and evidence of ice stream and tunnel valley flow directions. The sharp boundaries of the reconstructed past drainage basins complement the flexurally smoothed GIA signal that is more often used to validate ice-sheet reconstructions, and provide a complementary framework to reduce nonuniqueness in model reconstructions of the North American ice-sheet complex.

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Influence of provenance and transport process on the geochemistry and radiogenic (Hf, Nd, and Sr) isotopic composition of Pleistocene glacial sediments, Minnesota, USA

et al. 2020

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A model for the demise of large, glacial Lake Ojibway, Ontario and Quebec

Cited by 18 publications

References 32 publications

The drainage of Lake Ojibway in glaciolacustrine sediments of northern Ontario and Quebec, Canada

The drainage of Lake Ojibway in glaciolacustrine sediments of northern Ontario and Quebec, Canada

Reconstruction of North American drainage basins and river discharge since the Last Glacial Maximum

Influence of provenance and transport process on the geochemistry and radiogenic (Hf, Nd, and Sr) isotopic composition of Pleistocene glacial sediments, Minnesota, USA

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