Quaternary Stratigraphy Along Pelly River in Glenlyon and Carmacks map Areas, Yukon Territory

Ward, Barbara

doi:10.4095/127500

Cited by 2 publications

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“…Radiocarbon ages from wood and fossils underlying McConnell till indicate that the McConnell glaciation began after 29,600±300 14 C yr BP (Matthews et al, 1990), but glaciers did not advance into major valleys before 26,350±280 14 C yr BP (Jackson and Harington, 1991), and a fully developed CIS did not exist until after 23,900±1140 14 C yr BP (Lowdon and Blake, 1981). Published radiocarbon ages indicate that the St. Elias lobe of the CIS was in retreat by 13,660±180 14 C yr BP (Rampton, 1971) and the Selwyn lobe by 12,590±120 14 C yr BP (Ward, 1989) (Fig. 2).…”

Section: The Cordilleran Ice Sheetmentioning

confidence: 99%

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Investigating the glacial history of the northern sector of the Cordilleran Ice Sheet with cosmogenic 10Be concentrations in quartz

Stroeven

Fabel

Codilean

et al. 2010

Quaternary Science Reviews

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Section: The Cordilleran Ice Sheetmentioning

confidence: 99%

“…2 and 4) was flanked by the CIS, which extended up many valleys in the range but left much of the uplands ice-free (Campbell, 1967;Ward andJackson, 1992, 2000). Based on descriptions (Campbell, 1967), surficial geology maps (Ward and Jackson, 1992, Fig.…”

Section: Glenlyon Rangementioning

confidence: 99%

Investigating the glacial history of the northern sector of the Cordilleran Ice Sheet with cosmogenic 10Be concentrations in quartz

Stroeven

Fabel

Codilean

et al. 2010

Quaternary Science Reviews

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“…This indicates that retreat from the terminal position had begun in this area before that time. Shell from marl 120 km inboard from the terminus of the Selwyn lobe in the PeIIy River basin yielded an age of 12,590 ± 120 (TO-931; Ward, 1989) indicating extensive retreat by this time. This age must be regarded with caution since freshwater shells have been shown to provide unreliable radiocarbon ages (Clague, 1982).…”

Section: Chronology Of the Last Cordilleran Ice Sheetmentioning

confidence: 99%

The Last Cordilleran Ice Sheet in Southern Yukon Territory

Jackson¹,

Ward²,

Duk-Rodkin³

et al. 2007

gpq

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The Cordilleran Ice Sheet in Yukon radiated from ice-divides in the Selwyn, PeIIy1 Cassiar, and eastern Coast Mountains and was contiguous with a piedmond glacier complex from the St. Elias Mountains. Expansion of glaciers in divide areas could have been underway by 29 ka BP but these did not merge to form the ice sheet until after 24 ka BP. The firn line fell to approximately 1500 m at the climax of McConnell Glaciation. Flow within the ice sheet was more analogous to a complex of merged valley glaciers than to that of extant ice sheets: topographic relief was typically equal to or exceeded ice thickness, and strongly influenced ice flow. Surface gradients on the ice sheet were fractions of a degree. Steeper ice-surface gradients occurred locally along the digitate ice margin. Retreat from the terminal moraine was initially gradual as indicated by recessional moraines within a few tens of kilometres of the terminal moraine. Small magnitude readvances occurred locally. The ice sheet eventually disappeared through regional stagnation and downwasting in response to a rise in the firn line to above the surface of the ice sheet. Regional déglaciation was complete prior to approximately 10 ka BP.L'Inlandsis de la Cordillère a progressé dans le Yukon à partir des lignes de partage des glaces des monts Selwyn, PeIIy et Cassiar et de l'est de la chaîne Côtière; il était contigu à un glacier de piémont complexe en provenance des monts St. Elias. Les glaciers ont pu se développer dans les régions de partage des glaces à partir de 29 ka BP, mais ils ne se sont fusionnés pour former un inlandsis qu'à partir de 24 ka BP. À l'optimum de la Glaciation de McConnell, la ligne de névé s'est abaissée à environ 1500 m. L'écoulement à l'intérieur de l'inlandsis ressemblait davantage à celui d'un complexe de glaciers de vallées coalescents qu'à celui des inlandsis actuels: le relief rejoignait l'épaisseur de glace ou la dépassait et influençait grandement l'écoulement glaciaire. Sur l'inlandsis, les gradients du profil topographique se mesuraient en fractions de degrés, mais le long de la marge digitée, les gradients étaient par endroits plus prononcés. Le retrait à partir de la moraine frontale a au départ été graduel comme l'indiquent les moraines de retrait à quelques dizaines de kilomètres de la moraine frontale. Il y eut localement quelques récurrences mineures. L'inlandsis disparut avec le temps par stagnation à une échelle régionale et fonte en réponse à une hausse de la ligne de névé au-dessus de la surface de l'inlandsis. À l'échelle régionale, la déglaciation était terminée avant 10kaBP environ.Die Kordilleren-Eisdecke in Yukon breitete sich strahlenfôrmig von den Eisscheiden der Seywyn-, Pelley- und Cassiar-Berge und den ôstlichen Kùstenbergen aus und grenzte an einen Vorlandgletscher von den St. Elias-Bergen. Die Ausdehnung der Gletscher in den Eisscheiden-Gebieten kônnte schon um 29 ka v.u.Z. eingesetzt haben; doch sind sie erst nach 24 ka v.u.Z. zu der Eisdecke verschmolzen. Die Firn-Linie sank auf etwa 1500m wâhrend des...

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Quaternary Stratigraphy Along Pelly River in Glenlyon and Carmacks map Areas, Yukon Territory

Cited by 2 publications

References 0 publications

Investigating the glacial history of the northern sector of the Cordilleran Ice Sheet with cosmogenic 10Be concentrations in quartz

Investigating the glacial history of the northern sector of the Cordilleran Ice Sheet with cosmogenic 10Be concentrations in quartz

The Last Cordilleran Ice Sheet in Southern Yukon Territory

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