Micromorphology of periglacial sediments from the Tayara site, Qikirtaq Island, Nunavik (Canada)

Todisco, Dominique; Bhiry, Najat

doi:10.1016/j.catena.2008.08.002

Cited by 35 publications

(46 citation statements)

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“…The observed alteration (e.g., exfoliation and chloritization) of detrital minerals is typically related to cool and wet conditions in the active layer (Fitzpatrick, ; Todisco & Bhiry, ). In the study region, this type of alteration is related to the presence of organic matter in the sediment, which usually favors moisture retention and enhances frost susceptibility and the formation of segregation ice and eventual cryoturbations, especially in sediments with low silt/clay content (Bunting & Fedoroff, ; Van Vliet‐Lanoë, , ; Todisco & Bhiry, ). The disparity in the physical and chemical weathering of the grains is partially explained by the difference in the susceptibility to frost in well‐washed sand (SC) as compared to sand with fine intergranular organic content (COS, OA).…”

Section: Discussionmentioning

confidence: 99%

“…In the OA microzone, the planar voids are triggered by freeze/thaw cycles and the growth of segregated ice, both of which indicate poor drainage at the Saunitarlik site. The compact and cryoturbated appearance of the organic matter in this microzone is strongly linked to the formation of ice lenses during the progress of the freezing front (Fitzpatrick, ; Todisco & Bhiry, ). The transition between the CS and OA microzones is characterized by subhorizontal voids (Figure f).…”

Section: Discussionmentioning

confidence: 99%

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Butchering Site Evolution Induced by Past and Recent Snowmelt Runoff: The Saunitarlik Site (JiEv‐15), Aivirtuuq Peninsula, Nunavik, Canada

2016

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A geoarchaeological study of a unique Inuit site in Nunavik was undertaken in order to document the impact of humans on the Arctic environment. The Saunitarlik archaeological site is located on the Aivirtuuq peninsula near Kangiqsujuaq (Nunavik), and it was used as a butchering site by Inuit in the 19th century. It consists of an open‐air midden containing thousands of bones lying in the bed of an intermittent stream. This study documents the transformation of soil at the Saunitarlik site as a result of butchering activities by comparing them with extra‐site soils. Chronostratigraphic and sedimentological analyses of extra‐site sections show a succession of facies associated with: (1) till reworked by the sea, (2) regressive shoreline deposits, (3) surface runoff deposits, and (4) eolian deposits. Surface runoff deposits that dominate the peninsula were linked to regional climatic variations. Micromorphology analyses of intra‐ and extra‐site sediments revealed that periglacial and surface runoff were the main factors influencing site evolution. The intra‐site sections are characterized by the presence of dark, greasy, and sandy organic matter layers. Chemical analysis of these layers using gas chromatography‐mass spectrometry (GC−MS) indicated the presence of well‐preserved animal fatty acids in the sediments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Butchering Site Evolution Induced by Past and Recent Snowmelt Runoff: The Saunitarlik Site (JiEv‐15), Aivirtuuq Peninsula, Nunavik, Canada

2016

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“…Phillips () published a model for the development of ‘turbate’ structures caused by turbulent flow in the basal shear zone of debris flow. Structures similar to ‘turbates’ termed ‘microcircles’ have also been found in cryosols, and attributed to the reorientation of grains by frost action (Morozowa, ; Van Vliet‐Lanoë, , ; Todisco and Bhiry, ).…”

Section: Discussionmentioning

confidence: 99%

Macro‐ and Micromorphologic Interpretation of Relict Periglacial Slope Deposits from the Holy Cross Mountains, Poland

Pawelec

Ludwikowska-Kędzia

2015

Permafrost & Periglacial

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Relict periglacial slope cover deposits in the Holy Cross Mountains of Poland are composed of material derived from bedrock, loess and sand of polygenic origin. The aim of this study was to interpret the processes that deposited three massive coarse‐grained diamictons near the base of gentle hillslopes. Based on macroscopic and microscopic sedimentological analyses, the diamictons are attributed to deposition by three processes – active‐layer detachment, solifluction and high‐energy overland flow – due to climatic and geomorphologic factors. The use of microscopic analysis revealed the detailed texture and structure of these deposits, and was particularly important in interpreting fine‐grained sediments produced by low‐energy overland flow. This technique served as the basis for the differentiation of solifluction deposits and high‐density flow deposits. The active‐layer detachment deposit (adjacent to the slip plane) was characterised by a heterogenous texture and breccia‐type structure with domains and clasts oriented parallel to the slope. The deposit included erosional surfaces and individual slip planes. The solifluction deposit was a clayey diamicton with a banded structure oriented parallel to the slope. The low‐energy overland flow deposit was laminated and sorted with laminae oriented parallel to the slope. The high‐energy overland flow deposit was a homogeneous and massive diamicton with a silty/sandy matrix and randomly oriented clasts and grains. The following characteristics helped identify the sediment type: the degree of homogenisation, texture, sedimentary structure and fabric. Features including plasmic fabric, deformation structures and microporosity played an additional role in identifying the studied deposits. In relict slope deposits, these features may be formed as a result of depositional or postdepositional processes. Copyright © 2015 John Wiley & Sons, Ltd.

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“…By detailed recognition of elements of the soil substrate and determination of their mutual relationships in space (pedon), it is possible to evaluate changes taking place in the primary bedrock under pedogenic processes [Zaniewski, Van der Meer 2005;Todisco, Bhiry 2008]. Determining the extent of these transformations, e.g.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Groundmass Colour as a Tool for Evaluating the Extent of Pedogenic Processes in Chromic Soils

Brzychcy¹,

Zagórski²,

Sieczko³

et al. 2012

Soil Science Annual

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The aim of the investigation was to define the extend of pedogenethic processes by analysis of colour changes in groundmass of each genetic horizon. The object of the research were Chromic soils developed from red deposits of Lower Triassic (Buntsandstein) in the Holy Cross Mountains. Micromorphological studies were made with polarization microscopes Olympus BX-41 and Olympus SZX-10. Image analysis was conducted with software program AxioVision 4.5 with Auto Measure module. The application of advanced methods of digital data analysis allowed for the quantitative compilation of measurement figures in thin sections. On the basis of micromorphometrical data designated objective numerical indicators, which allowed comparison groundmass color between each genetic horizon. Statistical analysis by ANOVA test confirm that groundmass color measured in RGB scale in investigated horizons are almost the same. Obtained results evidence that characteristic red color of soil substrate in analyzed soils developed from Lower Triassic rocks originated from the bedrock color. This fact indicates low extent of the pedogenic processes.

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Micromorphology of periglacial sediments from the Tayara site, Qikirtaq Island, Nunavik (Canada)

Cited by 35 publications

References 30 publications

Butchering Site Evolution Induced by Past and Recent Snowmelt Runoff: The Saunitarlik Site (JiEv‐15), Aivirtuuq Peninsula, Nunavik, Canada

Butchering Site Evolution Induced by Past and Recent Snowmelt Runoff: The Saunitarlik Site (JiEv‐15), Aivirtuuq Peninsula, Nunavik, Canada

Macro‐ and Micromorphologic Interpretation of Relict Periglacial Slope Deposits from the Holy Cross Mountains, Poland

Analysis of Groundmass Colour as a Tool for Evaluating the Extent of Pedogenic Processes in Chromic Soils

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