Cosmogenic 10Be and 26Al ages for the Last Glacial Maximum, eastern Baffin Island, Arctic Canada

Marsella, Kimberly A.; Bierman, Paul R.; Davis, P. Thompson; Caffee, Marc W.

doi:10.1130/0016-7606(2000)112<1296:cbaaaf>2.0.co;2

Cited by 77 publications

(53 citation statements)

References 71 publications

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“…The location of the margin of the southward glacier that drained Nares Strait is debated (Blake et al, 1996, Kelly et al, 1999. Baffin Island in the eastern Canadian Arctic also may have been glaciated more extensively than previously believed (Marsella et al, 2000). Further south, studies of the submarine Quaternary geology off Newfoundland indicate that grounded ice extended to the shelf edge during the Last Glacial Maximum, in contrast to earlier reconstructions where the ice margin was placed just offshore from the coast (Shaw et al, 2001).…”

Section: Discussionmentioning

confidence: 41%

Chronology of the last recession of the Greenland Ice Sheet

Bennike

Björck

2002

J Quaternary Science

166

138

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A new deglaciation chronology for the ice-free parts of Greenland, the continental shelf and eastern Ellesmere Island (Canada) is proposed. The chronology is based on a new compilation of all published radiocarbon dates from Greenland, and includes crucial new material from southern, northeastern and northwestern Greenland. Although each date provides only a minimum age for the local deglaciation, some of the dates come from species that indicate ice-proximal glaciomarine conditions, and thus may be connected with the actual ice recession. In addition to shell dates, dates from marine algae, lake sediments, peat, terrestrial plants and driftwood also are included. Only offshore and in the far south have secure late-glacial sediments been found. Other previous reports of late-glacial sediments (older than 11.5 cal. kyr BP) from onshore parts of Greenland need to be confirmed. Most of the present ice-free parts of Greenland and Nares Strait between Greenland and Ellesmere Island were not deglaciated until the early Holocene.

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Section: Discussionmentioning

confidence: 41%

Chronology of the last recession of the Greenland Ice Sheet

Bennike

Björck

2002

J Quaternary Science

166

138

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“…In northern Labrador, Clark and Josenhans (1990) combined marine and terrestrial evidence to suggest that LGM ice was more extensive than previously mapped, with the ice limit extending onto the continental shelf. Cosmogenic exposure dating (Marsella et al, 2000) also confirmed extensive Late Wisconsinan outlet glaciers in the fiords of Cumberland Peninsula.…”

Section: Extent and Thickness Of The Lis At Its Local Last Glacial Mamentioning

confidence: 78%

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Stokes

2017

CIG

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ABSTRACT. The last deglaciation of the Laurentide Ice Sheet (LIS) was associated with major reorganisations in the ocean-climate system and its retreat also represents a valuable analogue for understanding the rates and mechanisms of ice sheet collapse. This paper reviews the characteristics of the LIS at its Last GlacialMaximum (LGM) La deglaciación del inlandsis Lauréntide desde el Último Máximo Glaciar RESUMEN. La última deglaciación del inlandsis Lauréntide (LIS) estuvo relacionada con grandes reorganizaciones en el océano-clima y su retroceso representa un valioso ejemplo para comprender las tasas y mecanismos del colapso del inlandsis. Este artículo revisa las características del LIS en su Último Máximo Glaciar (LGM) y su consiguiente deglaciación, con especial énfasis en

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“…Rather than forming a single, normally distributed population, exposure ages from boulders in 33 polar regions often form multi-modal distributions (Marsella et al, 2000), consistent with 34 exposure during different numbers of interglacial periods as till was repeatedly reworked (Briner 35 et al, 2005;Corbett et al, 2015). When multiple nuclides with different half lives are analyzed 36 in the same sample, they can (but do not always) yield discordant exposure ages and isotopic 37 ratios indicative of at least one period of burial following initial exposure .…”

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confidence: 99%

Constraining multi-stage exposure-burial scenarios for boulders preserved beneath cold-based glacial ice in Thule, northwest Greenland

Corbett

Bierman

Rood

2016

Earth and Planetary Science Letters

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Boulders and landscapes preserved beneath cold-based, nonerosive glacial ice violate assumptions associated with simple cosmogenic exposure dating. In such a setting, simple single isotope exposure ages over estimate the latest period of surface exposure; hence, alternate approaches are required to constrain the multi-stage exposure/burial histories of such samples. Here, we report 28 paired analyses of 10Be and 26Al in boulder samples from Thule, northwest Greenland. We use numerical models of exposure and burial as well as Monte Carlo simulations to constrain glacial chronology and infer process in this Arctic region dominated by cold-based ice. We investigate three specific cases that can arise with paired nuclide data: (1) exposure ages that are coeval with deglaciation and 26Al/10Be ratios consistent with constant exposure; (2) exposure ages that pre-date deglaciation and 26Al/10Be ratios consistent with burial following initial exposure; and (3) exposure ages that predate deglaciation and 26Al/10Be ratios consistent with constant exposure. Most glacially-transported boulders in Thule have complex histories; some were exposed for tens of thousands of years and buried for at least hundreds of thousands of years, while others underwent only limited burial. These boulders were recycled through different generations of till over multiple glacial/interglacial cycles, likely experiencing partial or complete shielding during interglacial periods due to rotation or shallow burial by sediments. Our work demonstrates that the landscape in Thule, like many high-latitude landscapes, was shaped over long time durations and multiple glacial and interglacial periods throughout the Quaternary. January 28, 2016To the Editor:After performing a second set of revisions from two reviewers, we are resubmitting our manuscript, Constraining Multi-Stage Exposure-Burial Scenarios for Boulders Preserved Beneath Cold-Based Glacial Ice in Thule, Northwest Greenland, for publication in Earth and Planetary Science Letters.We appreciated the additional comments from the two Reviewers who revisited the manuscript and are glad to hear that our first round of revisions was effective. During this second round, we focused on making the minor wording changes suggested and providing additional information about quantification of Al in samples. Attached, you will find a list of the reviewers' suggestions and details about how we incorporated those suggestions.We are optimistic that these minor revisions have finished polishing the manuscript to ready it for publication. Thank you in advance for considering our revised draft. Thank you for the re-submission of this paper and for dealing so thoroughly with the comments of the previous reviewers. As I suggested I would in my decision letter last time, I sent the revision to two of the previous reviewers. Both or these are very happy with the revision and have only minor comments.Please could you attend to the final points listed below on your revised manuscript, and then I will be able to ...

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Cosmogenic 10Be and 26Al ages for the Last Glacial Maximum, eastern Baffin Island, Arctic Canada

Cited by 77 publications

References 71 publications

Chronology of the last recession of the Greenland Ice Sheet

Chronology of the last recession of the Greenland Ice Sheet

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Constraining multi-stage exposure-burial scenarios for boulders preserved beneath cold-based glacial ice in Thule, northwest Greenland

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