The late Quaternary environmental evolution of marine Arctic Canada: Barrow Strait to Lancaster Sound

Pieńkowski, Anna J.; England, John; Furze, Mark F.A.; MacLean, B C; Blasco, Steve

doi:10.1016/j.quascirev.2013.09.025

Cited by 22 publications

(47 citation statements)

References 111 publications

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“…ka BP (Dyke ; Dyke & Hooper ; Pieńkowski et al . ), with the elevation of marine limit declining eastwards from ~60 to ~22 m a.s.l. on Brodeur and Borden peninsulas (Baffin Island) and from ~55 to 37 m a.s.l.…”

Section: Regional Settingmentioning

confidence: 98%

“…) may also date to the YD (Pieńkowski et al . ), as may a 10 km readvance of grounded ice in Navy Board inlet (Dyke & Hooper ), although age control remains poor.…”

Section: Regional Settingmentioning

confidence: 99%

“…; Pieńkowski et al . , , ). An east−west connection through Barrow Strait and Lancaster Sound was achieved 11–10.5 cal.…”

Section: Regional Settingmentioning

confidence: 99%

“…ka BP (Pieńkowski et al . ). The opening of Nares Strait remains debated, but likely occurred after 9.8 cal.…”

mentioning

confidence: 97%

“…; Dyke ; Dyke & Hooper ; Pieńkowski et al . ), some localities are marked by late Quaternary histories that stand in contrast to the emerging regional model. For example, the glacial and deglacial history of Bylot Island (Klassen , , ), at the critical intersection of Lancaster Sound and Baffin Bay (Fig.…”

mentioning

confidence: 99%

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Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

Furze

Pieńkowski

McNeely

et al. 2017

Boreas

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Core 2011804-0010 from easternmost Lancaster Sound provides important insights into deglacial timing and style at the marine margin of the NE Laurentide Ice Sheet (LIS). Spanning 13.2-11.0 cal. ka BP and investigated for ice-rafted debris (IRD), foraminifera, biogenic silica and total organic carbon, the stratigraphy comprises a lithofacies progression from proximal grounding line and sub-ice shelf environments to open glaciomarine deposition; a sequence similar to deposits from Antarctic ice shelves. These results are the first marine evidence of a former ice shelf in the eastern Northwest Passage and are consistent with a preceding phase of ice streaming in eastern Lancaster Sound. Initial glacial float-off and retreat occurred >13.2 cal. ka BP, followed by formation of an extensive deglacial ice shelf during the Younger Dryas, which acted to stabilize the retreating margin of the NE LIS until 12.5 cal. ka BP. IRD analyses of sub-ice shelf facies indicate initial high input from source areas on northern Baffin Island delivered to Lancaster Sound by a tributary ice stream in Admiralty Inlet. After ice shelf break-up, Bylot Island became the dominant source area. Foraminifera are dominated by characteristic ice-proximal glaciomarine benthics (Cassidulina reniforme, Elphidium excavatum f. clavata), complemented by advected Atlantic water (Cassidulina neoteretis, Neogloboquadrina pachyderma) and enhanced current indicators (Lobatula lobatula). The biostratigraphy further supports the ice shelf model, with advection of sparse faunas beneath the ice shelf, followed by increased productivity underopen water glaciomarine conditions. The absence of Holocene sediments in the core suggests that the uppermost deposits were removed, most likely due to mass transport resulting from the site's proximity to modern tidewater glacier margins. Collectively, this study presents important new constraints on the deglacial behaviour of the NE Laurentide Ice Sheet, with implications for past ice sheet stability, ice-rafted sediment delivery, and iceÀocean interactions in this complex archipelago setting.

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Section: Regional Settingmentioning

confidence: 98%

“…) may also date to the YD (Pieńkowski et al . ), as may a 10 km readvance of grounded ice in Navy Board inlet (Dyke & Hooper ), although age control remains poor.…”

Section: Regional Settingmentioning

confidence: 99%

“…; Pieńkowski et al . , , ). An east−west connection through Barrow Strait and Lancaster Sound was achieved 11–10.5 cal.…”

Section: Regional Settingmentioning

confidence: 99%

“…ka BP (Pieńkowski et al . ). The opening of Nares Strait remains debated, but likely occurred after 9.8 cal.…”

mentioning

confidence: 97%

mentioning

confidence: 99%

See 3 more Smart Citations

Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

Furze

Pieńkowski

McNeely

et al. 2017

Boreas

Self Cite

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Aquatic palynomorphs from modern marine sediments in a reconnaissance transect across the Northwest Passage – Baffin Bay region

Pieńkowski¹,

Kennaway

Lang³

2020

Marine Micropaleontology

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New cetacean ΔR values for Arctic North America and their implications for marine-mammal-based palaeoenvironmental reconstructions

Furze

Pieńkowski

Coulthard

2014

Quaternary Science Reviews

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The late Quaternary environmental evolution of marine Arctic Canada: Barrow Strait to Lancaster Sound

Cited by 22 publications

References 111 publications

Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

Aquatic palynomorphs from modern marine sediments in a reconnaissance transect across the Northwest Passage – Baffin Bay region

New cetacean ΔR values for Arctic North America and their implications for marine-mammal-based palaeoenvironmental reconstructions

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