Frontal advance of turf-banked solifluction lobes, Kluane Range, Yukon Territory, Canada

Kinnard, Christophe; Lewkowicz, Antoni G.

doi:10.1016/j.geomorph.2005.06.010

Cited by 32 publications

(35 citation statements)

References 38 publications

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“…L'étalonnage a été effectué à partir des datations conventionnelles, c'est-à-dire corrigées pour le fractionnement isotopique. Le temps de séjour de la matière organique dans un sol (c'est-à-dire l'âge moyen de la matière organique en décomposition constituant un horizon H) doit être considéré, les humus livrant un âge apparent qui diffère de l'âge réel du sol (Paul et al, 1964 ;Matthews, 1980 ;Kinnard et Lewkowicz, 2006). En raison de l'incertitude liée au temps de séjour et aux différents prétraitements des échantillons (Martin et Johnson, 1995 ;Wang et Hsieh, 2002), nous présumons que les datations 14 C obtenues sur les paléo-sols fournissent un âge minimal pour l'émersion des terres et un âge maximal pour l'enfouissement d'une surface donnée.…”

Section: Datations Au Radiocarboneunclassified

Émersion des terres et développement des sols bien drainés au lac Guillaume-Delisle, Québec subarctique

Lafortune

Filion

Hétu

2007

gpq

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Dans la région du lac Guillaume-Delisle, au Québec subarctique, des cônes de déjection d’âge et d’altitude variables se sont déposés tout au cours de l’Holocène sur des plages soulevées, offrant ainsi la possibilité d’étudier une chronoséquence holocène de sols. Le cadre temporel a été établi par la datation radiocarbone de 38 horizons organiques enfouis et la mise à jour de la courbe d’émersion des terres pour la région. L’émersion se serait effectuée selon un taux moyen de 5,6 m/siècle entre 8500 et 4500 années cal. BP et de 1,2 m/siècle après 4500 années cal. BP. Les analyses morphologiques et chimiques ont montré que les sols et paléosols subarctiques sableux, bien drainés et soustraits à l’influence des combes à neige, sont formés principalement par l’accumulation dans l’horizon B de matière organique humifiée combinée à de l’aluminium et du fer (podzolisation). L’enrichissement de l’horizon B en fer et en aluminium se fait lentement en suivant une fonction linéaire. La durée de pédogenèse requise pour obtenir le seuil minimal (Fep+Alp) de 0,4 % pour l’horizon Bf fixé par le Système canadien de classification des sols serait d’environ 12 400 années. Bien que théorique, cette durée indique à quel point les conditions nécessaires à la formation des podzols sont difficiles à réunir dans les sols subarctiques où la végétation demeure basse et le couvert nival peu épais.In the Lake Guillaume-Delisle area, alluvial fans of various ages and elevations were deposited throughout the Holocene over raised beach deposits, which allowed the studying of a subarctic soil chronosequence. The temporal framework is based on 38 14C dates obtained from buried organic soil horizons, and on an update of the Lake Guillaume-Delisle emersion curve. Postglacial uplift due to glacio-isostatic rebound occurred at a mean rate of 5.6 m/century from 8500 to 4500 cal. yr BP, and of 1.2 m/century after 4500 cal. yr BP. Soil morphology and chemistry showed that well-drained sandy soil and paleosoil development, when not influenced by late-lying snowpatches and snowmelt, is characterized by B horizons having a dominant accumulation product of amorphous material composed mainly of humified organic matter combined with Al and Fe (podzolisation). However, pedogenic development is weak and would take about 12 400 years to reach the minimum values of (Fep+Alp) ≥0,4% required for meeting the criteria of a Bf horizon in the Canadian system of soil classification, according to a linear function. Although theoretical, this value indicates that conditions required for Podzol formation are hard to reach in subarctic soils with low vegetation and thin snow cover

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Section: Datations Au Radiocarboneunclassified

Émersion des terres et développement des sols bien drainés au lac Guillaume-Delisle, Québec subarctique

Lafortune

Filion

Hétu

2007

gpq

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“…Both possible reasons require further analysis. High variability of organic content can be explained by the stratigraphic observations of Hugenholtz and Lewkowicz (2002), Kinnard and Lewkowicz (2006), Oliva et al (2009), who revealed buried organic horizons, overlapping and deformed layers in solifluctional forms. Consequently, organic matter and carbonate content determination as well as additioal mineralogical analyses can add further insight to the interpretation of discrepancies.…”

Section: Discussionmentioning

confidence: 99%

Comparative Grain-Size Measurements for Validating Sampling and Pretreatment Techniques in Terms of Solifluction Landforms, Southern Carpathians, Romania

Șerban

Sípos

Popescu

et al. 2015

Journal of Environmental Geography

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Grain-size distribution has become in the last years an important indicator in the analysis of periglacial processes and landforms. However, as they exhibit a complex sedimentology, careful sampling is required to draw meaningful conclusions. The aim of the present study was therefore to validate the sampling procedure carried out on solifluction forms and to evaluate the effect of sampling pretreatment during grain size analysis. A comparison between multiple measurements of grain size distribution using the laser diffraction method (LDM) was performed on 54 sediment samples collected from different solifluction landforms at different depths in the alpine area of the Southern Carpathians. The results of parallel measurements were compared using textural and statistical indicators. The received distributions reinforced the properness of field sampling procedure in most of the cases. The results of textural classification and fractional composition showed a high consistency between the two parallel measurements made on untreated and pretreated samples. An overall fining as a matter of etching was identified. Relative deviation increased and correlation decreased as pretreatment advanced. HCl etching resulted a greater deviation and variability in case of the sand fraction, H 2 O 2 rather affected the silt fraction. The greatest deviations were experienced in case of landforms developed on crystalline limestone. Pretreatment of samples introduced a major uncertainty to further comparison and interpretation. Thus, multiple LD measurements on a representative group of samples from the entire sample set were suggested before the geomorphological or environmental interpretation of results to decrease the uncertainties and to validate the processes.

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“…The apparent mean residence time (AMRT) of soils (i.e., the average age of decomposed organic matter in a dated horizon) has to be considered when using radiocarbon-dated soil samples (Paul et al, 1964;Matthews, 1980;Kinnard and Lewkowicz, 2006). Because of the uncertainty in both AMRT and laboratory results from different pre-treatments (Martin and Johnson, 1995;Wang and Hsieh, 2002), it is assumed here that radiocarbon dates correspond to the maximum age of burial.…”

Section: Radiocarbon Dating and Chronology Buildingmentioning

confidence: 99%

Impacts of Holocene climatic variations on alluvial fan activity below snowpatches in subarctic Québec

2006

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Frontal advance of turf-banked solifluction lobes, Kluane Range, Yukon Territory, Canada

Cited by 32 publications

References 38 publications

Émersion des terres et développement des sols bien drainés au lac Guillaume-Delisle, Québec subarctique

Émersion des terres et développement des sols bien drainés au lac Guillaume-Delisle, Québec subarctique

Comparative Grain-Size Measurements for Validating Sampling and Pretreatment Techniques in Terms of Solifluction Landforms, Southern Carpathians, Romania

Impacts of Holocene climatic variations on alluvial fan activity below snowpatches in subarctic Québec

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