Constraining the age of the last interglacial–glacial transition in the Hudson Bay lowlands (Canada) using U–Th dating of buried wood

Allard, G.; Roy, Martin; Ghaleb, Bassam; Richard, Pierre J. H.; Larouche, Alayn C.; Veillette, J J; Parent, Michel

doi:10.1016/j.quageo.2011.09.004

Cited by 25 publications

(36 citation statements)

References 39 publications

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“…The application of U-series dating to fossil wood is difficult because of the lack or very negligible content of uranium in the structure of living trees (Allard et al, 2012). Our data testify that despite the low specific activity of uranium isotopes, they are present in measurable concentrations and show that modern wood is able to incorporate uranium from the groundwater while excluding thorium.…”

Section: Radiocarbon Dating Resultssupporting

confidence: 54%

“…In the case of our study, however, geochemically open behavior in 5 samples precluded the application of these corrections. Comparison between the uncorrected and corrected ages of fossil wood indicates that the magnitude of the correction is often less than the analytical errors derived for samples contained negligible Th contamination (Allard et al, 2012).…”

Section: Discussionmentioning

confidence: 98%

“…On the basis of the isochron approach described by Maksimov and Kuznetsov (2010) we have obtained a number of 230 Th/U ages for the middle and upper Pleistocene organic-rich deposits from Siberia and Europe (Arslanov et al, 2004;Maksimov et al, 2006Maksimov et al, , 2010aMaksimov et al, , 2010bGaigalas et al, 2007;Laukhin et al, 2008aLaukhin et al, , 2008b. These Pleistocene sediments commonly contain wood remnants, but few results of their dating by the 230 Th/U method have been published up to now (de Vernal et al, 1986;Oschadleus et al, 1996;Allard et al, 2012). Wood remnants are found in so-called stump layers, but occur as trunk and branch fragments as well.…”

Section: Introductionmentioning

confidence: 99%

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Comparative 230Th/U and 14C Dating of a Buried Stump Layer (Western Siberia)

et al. 2015

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Dating of late Pleistocene sediments remains a challenge in Quaternary chronology, due to the inherent limitations of the 14 C and OSL methods. The 230 Th/U radioisotope method is theoretically applicable to wood remnants contained within Pleistocene sediments, but few results have been published to date and in some cases, the age data are ambiguous. This paper tests the use of 230 Th/U dating of fossil wood remnants dated earlier by radiocarbon method. We analyzed a buried larch trunk from a well-known stump layer in the Lipovka outcrop, located on the Tobol River bank in Western Siberia. The stump layer is preserved in situ. We determined the specific activities of U and Th isotopes in samples of both modern pine and fossil larch and proposed a model for the incorporation and distribution of U and Th in the buried wood during aging. Complications related with the recognition of geochemical closed systems with respect to U did not allow obtaining completely reliable 230 Th/U age. Despite this the 230 Th/U age obtained for the uppermost heartwood sample and 14 C ages of the same larch trunk and other wood and vegetation remnants gave consistent results. These age data in combination with previously obtained pollen data testify the stump layer formation during the late cooling stage of the Karganian time (MIS-3, Middle Valdai).

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Section: Radiocarbon Dating Resultssupporting

confidence: 54%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Comparative 230Th/U and 14C Dating of a Buried Stump Layer (Western Siberia)

et al. 2015

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“…Kleman et al, 2010) that have survived modification and, in some places, been dated to periods prior to the LGM (e.g. Allard et al, 2012;Dalton et al, 2016).…”

Section: Inception and Build-up To Its Last Glacial Maximummentioning

confidence: 99%

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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“…dating that was then undetected -anomalous fading (Huntley and Lamothe 2001), which has the main pitfall of yielding age underestimates. Recently, U-series dating was applied to fossil logs of an extensive nonglacial unit east of James Bay (Allard et al 2012). The analyses revealed that these fossil logs were part of a geochemical system suitable for Th-U dating, yielding 230 Th/U ages ranging from 119 to 99 ka, thus indicating that one of the nonglacial units present in the James Bay basin belongs to the last interglaciation sensu stricto (i.e., MIS 5e; ϳ130-114 ka).…”

Section: James Bay Lowlands Stratigraphy and The Labrador-quebec Sectormentioning

confidence: 99%

Glacial and nonglacial events in the eastern James Bay lowlands, Canada

et al. 2013

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Marine and continental records indicate that the Laurentide Ice Sheet (LIS) was highly dynamic throughout the last glacial cycle, with significant reorganizations of its ice divide system. The extensive depositional record of the Hudson Bay lowlands (HBL) is particularly important for the study of ice sheet dynamics because this region was once located near two important ice domes of the LIS. However, important stratigraphic issues remain in the HBL, notably regarding the chronology of nonglacial units and the direction and extent of the ice-flow events recognized. Here we focus on the northeastern sector of the LIS by documenting the provenance of tills and dating nonglacial deposits in sedimentary sequences east of James Bay. Our investigations indicate that the regional stratigraphy comprises at least five distinct tills and an important unit of glaciolacustrine rhythmites. This glacial sequence lies on massive lacustrine clay and fluvial sand containing abundant organic debris and wood fragments. The clast lithology and matrix geochemistry of tills show significant variations that are consistent with the ice-flow movements deduced from clast fabric measurements. Taken together, the till compositional and fabric data suggest an early westward ice flow, followed by a counterclockwise shift to a west-southwest, southwest, and then south-southeast ice flows. Luminescence dating of waterlaid sediments outlines a complex and fragmentary stratigraphic record, which comprises two distinct nonglacial units belonging to the last and penultimate interglaciations. These results and stratigraphic considerations indicate that the documented ice-flow rearrangements likely occurred during the last glacial cycle.Résumé : Les données géologiques marines et continentales indiquent que l'inlandsis Laurentidien était très dynamique durant le dernier cycle glaciaire et qu'il a été marqué par d'importantes modifications de la géométrie de ses lignes de partage des glaces. Les nombreux enregistrements sédimentaires des basses terres de la baie d'Hudson sont particulièrement importants pour l'étude de la dynamique des inlandsis puisque cette région a déjà été située à proximité de deux grands dômes de glace de l'inlandsis. Toutefois, il reste des questions stratigraphiques significatives dans les basses terres de la baie d'Hudson, notamment en ce qui concerne la chronologie des unités non glaciaires ainsi que la direction et l'étendue des écoulements glaciaires reconnus. Nous ciblons ici le secteur nord-est de l'inlandsis Laurentidien en documentant la provenance des tills et en datant les dépôts non glaciaires dans les séquences sédimentaires à l'est de la baie James. Nos recherches indiquent que la stratigraphie régionale comporte au moins cinq tills distincts et une unité importante de rythmites glacio-lacustres. Cette séquence glaciaire repose sur une argile lacustre massive et du sable fluviatile contenant d'abondants débris organiques et fragments de bois. La lithologie des clastes et la géochimie de la matrice des tills montre...

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Constraining the age of the last interglacial–glacial transition in the Hudson Bay lowlands (Canada) using U–Th dating of buried wood

Cited by 25 publications

References 39 publications

Comparative <sup>230</sup>Th/U and <sup>14</sup>C Dating of a Buried Stump Layer (Western Siberia)

Comparative <sup>230</sup>Th/U and <sup>14</sup>C Dating of a Buried Stump Layer (Western Siberia)

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Glacial and nonglacial events in the eastern James Bay lowlands, Canada

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