Glacial dispersal train of Paleozoic erratics, central Baffin Island, N.W.T., Canada

Tippett, C R

doi:10.1139/e85-193

Cited by 32 publications

(11 citation statements)

References 17 publications

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“…Till CIA values on the Rae Craton range from 20–90 (Figure 1b) and generally decrease inland from Foxe Basin, but several plumes of higher Ca/Na ratios extend from Foxe Basin to Cambridge and Clyde Fiords and Home Bay (Figure 1c). The latter is consistent with a train of carbonate boulders [ Tippett , 1985], and all higher Ca/Na plumes correspond to a high concentration of lakes in ice‐scoured bedrock [ Andrews et al , 1985].…”

Section: Chemical Index Of Alterationmentioning

confidence: 53%

Reorganization of ice sheet flow patterns in Arctic Canada and the mid‐Pleistocene transition

Refsnider

Miller

2010

Geophysical Research Letters

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[1] Evidence for the evolution of Laurentide Ice Sheet (LIS) basal thermal regime patterns during successive glaciations is poorly preserved in the geologic record. Here we explore a new approach to constrain the distribution of cold-based ice across central Baffin Island in the eastern Canadian Arctic over many glacial-interglacial cycles by combining till geochemistry and cosmogenic radionuclide (CRN) data. Parts of the landscaped with geomorphic evidence for limited glacial erosion are covered by till characterized by high chemical index of alteration (CIA) values and CRN concentrations requiring complicated burial-exposure histories. Till from regions scoured by glacial erosion have CIA values indistinguishable from local bedrock and CRN concentrations that can be explained by simple exposure following deglaciation. CRN modeling results based on these constraints suggest that the weathered tills were deposited by 1.9 to 1.

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Section: Chemical Index Of Alterationmentioning

confidence: 53%

Reorganization of ice sheet flow patterns in Arctic Canada and the mid‐Pleistocene transition

Refsnider

Miller

2010

Geophysical Research Letters

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“…Admiralty and Milne-Navy Board Inlets probably carried ice streams, because of their large sizes, large ice catchment areas and distances of debris transport (Dyke and Hooper, 2000b). Ice also flowed northeastward to fiords on the northeast coast (Ives and Andrews, 1963), and eastward across central Baffin Island, forming a large carbonate dispersal train (Andrews et al, 1970;Tippett, 1985).…”

Section: Regional Concepts Of Last Glaciationmentioning

confidence: 99%

The Steensby Inlet Ice Stream in the context of the deglaciation of Northern Baffin Island, Eastern Arctic Canada

Dyke

2008

Earth Surf Processes Landf

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Deglaciation of northern Baffin Island involved several large ice streams with contrasting histories. Three north-flowing, marine-based ice streams were in place during the Last Glacial Maximum, but they retreated at widely varying rates during the early and middle Holocene. The Steensby Inlet Ice Stream formed in response to over-steepening of the ice front during deglaciation of Foxe Basin. It caused an abrupt change, in places a general reversal, of flow about 6 ka BP and operated across its full width for only about 500 years. Nevertheless, it left a distinct subglacial footprint, including an hourglass shaped bedform set. A dense network of till samples from the region of the ice stream reveals a sharp-sided, pluglike dispersal of carbonate debris that was sustained by erosion in the source area of about 5 mm a − − − − −1 . The ice stream devolved into valley-controlled ice streams separated by cold-based ice over interfluves. The former evacuated debris along valleys and left erosional till scarps along the sides of sliding ice. Post-ice-stream end moraines, including the large Gifford Moraine, require later cold-based flow across the drumlins formed by the ice stream.

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“…A single minor ice stream traversed central Baffin Island, northwest of Cumberland Peninsula. It exploited a low point in the topographic backbone of Baffin Island, with the prime evidence for its existence being plumes of carbonate‐bearing till derived from the western coast of Baffin Island or Foxe Basin [ Tippett , 1985].…”

Section: Source Of Heinrich Layer Sedimentsmentioning

confidence: 99%

Catastrophic ice shelf breakup as the source of Heinrich event icebergs

et al. 2004

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[1] Heinrich layers of the glacial North Atlantic record abrupt widespread iceberg rafting of detrital carbonate and other lithic material at the extreme-cold culminations of Bond climate cycles. Both internal (glaciologic) and external (climate) forcings have been proposed. Here we suggest an explanation for the iceberg release that encompasses external climate forcing on the basis of a new glaciological process recently witnessed along the Antarctic Peninsula: rapid disintegrations of fringing ice shelves induced by climate-controlled meltwater infilling of surface crevasses. We postulate that peripheral ice shelves, formed along the eastern Canadian seaboard during extreme cold conditions, would be vulnerable to sudden climate-driven disintegration during any climate amelioration. Ice shelf disintegration then would be the source of Heinrich event icebergs.

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Glacial dispersal train of Paleozoic erratics, central Baffin Island, N.W.T., Canada

Cited by 32 publications

References 17 publications

Reorganization of ice sheet flow patterns in Arctic Canada and the mid‐Pleistocene transition

Reorganization of ice sheet flow patterns in Arctic Canada and the mid‐Pleistocene transition

The Steensby Inlet Ice Stream in the context of the deglaciation of Northern Baffin Island, Eastern Arctic Canada

Catastrophic ice shelf breakup as the source of Heinrich event icebergs

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