Geochemical and indicator mineral reconnaissance survey of surficial sediments, Southampton Island, Nunavut

Ross, M.; Kosar, Kevin G. A.

doi:10.4095/247643

Cited by 2 publications

(4 citation statements)

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“…A 30–35 g aliquot of each sample was analysed at Activation Laboratories Ltd (Actlabs, Ancaster, Ontario) by Instrumental Neutron Activation Analysis (INAA) and Induced Coupled Plasma‐Mass Spectrometry (ICP‐MS) techniques. Further details on sampling techniques and analytical procedures, as well as the entire sample database, may be found in Ross & Kosar (2009).…”

Section: Methodsmentioning

confidence: 99%

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The subglacial record of northern Hudson Bay: insights into the Hudson Strait Ice Stream catchment

Ross

Lajeunesse

Kosar

2010

Boreas

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Ross, M., Lajeunesse, P. & Kosar, K. G. A. 2010: The subglacial record of northern Hudson Bay: insights into the Hudson Strait Ice Stream catchment. Boreas, 10.1111/j.1502‐3885.2010.00176.x. ISSN 0300‐9483. In this paper, we present new insights into the glacial dynamics and potential configuration of the Hudson Strait Ice Stream catchment in the northern Hudson Bay–western Hudson Strait region. Our reconstruction is based on new field observations and till compositional data from Southampton Island, remote sensing imagery and multibeam bathymetric data from the Hudson Bay sea floor, as well as on a re‐examination of previously published data from this vast region. Our findings suggest that, during the late Quaternary, the HSIS catchment consisted of a number of ice‐stream tributaries feeding a curvilinear trunk that potentially extended into western Hudson Bay. In contrast to previous interpretations, the occurrence of fluted bedrock hills, over‐deepened basins, Dubawnt erratics and carbonaceous till on the islands at the head of Hudson Strait is taken to imply that cold‐based conditions did not prevail on these islands. The upland area of Southampton Island and the surrounding channels played an important role in controlling the location of the main tributaries, with the higher central terrain forming a large inter‐ice‐stream zone lacking carbonate detritus. Coats Island contains abundant evidence of vigorous ice flow, such as mega‐scale glacial lineations (MSGLs). MSGLs also occur on the sea floor southwest of Coats Island but the sea‐floor imprint is highly discontinuous. Observations on the western Hudson Bay mainland show evidence of southeastward fast ice flow that is spatially consistent with the Dubawnt dispersal train. Despite the geomorphological discontinuities, this may indicate that the HSIS onset zone extended far inside the Laurentide Ice Sheet and across contrasting geological domains.

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Section: Methodsmentioning

confidence: 99%

“…In this paper, we use data from two extensive field surveys of the Quaternary geology of Southampton Island (Ross & Kosar 2009) as well as from a series of recent research cruises investigating the sea-floor geomorphology and Quaternary stratigraphy of Hudson Bay. We also integrate these new data sets with relevant published data (cf.…”

Section: Methodsmentioning

confidence: 99%

The subglacial record of northern Hudson Bay: insights into the Hudson Strait Ice Stream catchment

Ross

Lajeunesse

Kosar

2010

Boreas

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“…They describe a fragmentary record of ice-flow patterns and two paleo-ice streams limited by sharp boundaries on Southampton Island. More recently, Ross and Kosar (2009) and Ross et al (2011) presented field-based ice-flow indicators and till compositional data for Southampton Island as well as additional mapped glacial landforms. From this work, it appears that the upland area of Southampton Island and the surrounding channels (e.g.…”

Section: Glacial Geology and Deglaciation Historymentioning

confidence: 99%

“…One possible explanation for this discrepancy may be differences in the local geological settings between the two study areas. The samples from this study are from the outer fringe of the uplands of Southampton Island, an area consisting of Precambrian rocks and till with very low carbonate content (Ross and Kosar, 2009;Ross et al, 2011), whereas samples of Vickers et al (2010) are from an area characterized by more widespread calcareous till. Additionally, the 14 C dilution from carbonate rocks (ageing effect) may have been more important for samples from the vicinity of Foxe Peninsula than around the uplands of Southampton Island because of differing glaciomarine conditions, for example higher sediment concentrations.…”

Section: Regional Marine Reservoir Effectmentioning

confidence: 99%

Early Holocene deglaciation of northern Hudson Bay and Foxe Channel constrained by new radiocarbon ages and marine reservoir correction

et al. 2012

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Radiocarbon ages from Southampton Island (Canada) provide new chronological control on the deglaciation of Foxe Channel and northern Hudson Bay, a strategic area for understanding the demise of a marine-based portion of the Laurentide Ice Sheet. A regional marine reservoir age of 630 ± 45 yr and a reservoir offset (ΔR) of 263 ± 48 yr were calculated from two early to mid-Holocene terrestrial/marine radiocarbon age pairs. These values are consistent with corrections based on early 20th century mollusks suggesting that following deglaciation the oceanic conditions controlling the regional reservoir effect rapidly became similar to those of modern times. However, our ΔR value is 352 ± 52 yr less than another correction from eastern Foxe Basin, which may be affected by 14 C dilution from carbonate rocks. Our ΔR value is used to calibrate new marine radiocarbon ages which help further develop the deglaciation history of Southampton Island, especially along the north coast where deglaciation of Foxe Channel appears to have been completed by 8100–7800 cal yr BP (2σ). This provides key chronological constraints on the development of a long marine ice margin in southern Foxe Basin prior to the final breakup of the Foxe ice dome.

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Geochemical and indicator mineral reconnaissance survey of surficial sediments, Southampton Island, Nunavut

Cited by 2 publications

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The subglacial record of northern Hudson Bay: insights into the Hudson Strait Ice Stream catchment

The subglacial record of northern Hudson Bay: insights into the Hudson Strait Ice Stream catchment

Early Holocene deglaciation of northern Hudson Bay and Foxe Channel constrained by new radiocarbon ages and marine reservoir correction

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