Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampen, Joutunheimen, southern Norway.

John Matthews, Peter Wilson, Stefan Winkler, Richard Mourne, Jennifer Hill, Geraint Owen, John Hiemstra, Helen Hallang, Andrew Geary

    Research output: Contribution to journalArticle

    Abstract

    Schmidt-hammer exposure-age dating (SHD) of boulders on cryoplanation terrace
    treads and associated bedrock cliff faces revealed Holocene ages ranging from 0 ±
    825 to 8890 ± 1185 yr. The cliffs were significantly younger than the inner treads,
    which tended to be younger than the outer treads. Radiocarbon dates from the regolith
    of 3854 to 4821 cal yr BP (2σ range) indicated maximum rates of cliff recession of ~0.1
    mm/year, which suggests the onset of terrace formation prior to the last glacial
    maximum. Age, angularity and size of clasts, together with planation across bedrock
    structures and the seepage of groundwater from the cliff foot, all support a processbased
    conceptual model of cryoplanation terrace development in which frost
    weathering leads to parallel cliff recession and hence terrace extension. The
    availability of groundwater during autumn freeze-back is viewed as critical for frost
    wedging and/or the growth of segregation ice during prolonged winter frost penetration.
    Permafrost promotes cryoplanation by providing an impermeable frost table beneath
    the active layer, focusing groundwater flow, and supplying water for sediment transport
    by solifluction across the tread. Snowbeds are considered an effect rather than a
    cause of cryoplanation terraces and cryoplanation is seen as distinct from nivation.
    LanguageEnglish
    JournalQuaternary Research
    Publication statusAccepted/In press - 13 Jun 2019

    Fingerprint

    cliff
    permafrost
    terrace
    frost
    nivation
    solifluction
    planation
    groundwater
    active layer
    clast
    groundwater flow
    seepage
    bedrock
    penetration
    autumn
    Norway
    Terraces
    Holocene
    ice
    winter

    Keywords

    • cryoplanation terraces
    • Schmidt-hammer exposure-age dating
    • mountain permafrost
    • periglacial processes
    • alpine landform development
    • frost weathering
    • nivation

    Cite this

    Matthews, J., Wilson, P., Winkler, S., Mourne, R., Hill, J., Owen, G., ... Geary, A. (Accepted/In press). Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampen, Joutunheimen, southern Norway. Quaternary Research.
    Matthews, John ; Wilson, Peter ; Winkler, Stefan ; Mourne, Richard ; Hill, Jennifer ; Owen, Geraint ; Hiemstra, John ; Hallang, Helen ; Geary, Andrew. / Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampen, Joutunheimen, southern Norway. In: Quaternary Research. 2019.
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    title = "Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampen, Joutunheimen, southern Norway.",
    abstract = "Schmidt-hammer exposure-age dating (SHD) of boulders on cryoplanation terracetreads and associated bedrock cliff faces revealed Holocene ages ranging from 0 ±825 to 8890 ± 1185 yr. The cliffs were significantly younger than the inner treads,which tended to be younger than the outer treads. Radiocarbon dates from the regolithof 3854 to 4821 cal yr BP (2σ range) indicated maximum rates of cliff recession of ~0.1mm/year, which suggests the onset of terrace formation prior to the last glacialmaximum. Age, angularity and size of clasts, together with planation across bedrockstructures and the seepage of groundwater from the cliff foot, all support a processbasedconceptual model of cryoplanation terrace development in which frostweathering leads to parallel cliff recession and hence terrace extension. Theavailability of groundwater during autumn freeze-back is viewed as critical for frostwedging and/or the growth of segregation ice during prolonged winter frost penetration.Permafrost promotes cryoplanation by providing an impermeable frost table beneaththe active layer, focusing groundwater flow, and supplying water for sediment transportby solifluction across the tread. Snowbeds are considered an effect rather than acause of cryoplanation terraces and cryoplanation is seen as distinct from nivation.",
    keywords = "cryoplanation terraces, Schmidt-hammer exposure-age dating, mountain permafrost, periglacial processes, alpine landform development, frost weathering, nivation",
    author = "John Matthews and Peter Wilson and Stefan Winkler and Richard Mourne and Jennifer Hill and Geraint Owen and John Hiemstra and Helen Hallang and Andrew Geary",
    year = "2019",
    month = "6",
    day = "13",
    language = "English",
    journal = "Quaternary Research",
    issn = "0033-5894",
    publisher = "Cambridge University Press",

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    Matthews, J, Wilson, P, Winkler, S, Mourne, R, Hill, J, Owen, G, Hiemstra, J, Hallang, H & Geary, A 2019, 'Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampen, Joutunheimen, southern Norway.', Quaternary Research.

    Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampen, Joutunheimen, southern Norway. / Matthews, John; Wilson, Peter; Winkler, Stefan; Mourne, Richard; Hill, Jennifer; Owen, Geraint; Hiemstra, John; Hallang, Helen; Geary, Andrew.

    In: Quaternary Research, 13.06.2019.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Age and development of active cryoplanation terraces in the alpine permafrost zone at Svartkampen, Joutunheimen, southern Norway.

    AU - Matthews, John

    AU - Wilson, Peter

    AU - Winkler, Stefan

    AU - Mourne, Richard

    AU - Hill, Jennifer

    AU - Owen, Geraint

    AU - Hiemstra, John

    AU - Hallang, Helen

    AU - Geary, Andrew

    PY - 2019/6/13

    Y1 - 2019/6/13

    N2 - Schmidt-hammer exposure-age dating (SHD) of boulders on cryoplanation terracetreads and associated bedrock cliff faces revealed Holocene ages ranging from 0 ±825 to 8890 ± 1185 yr. The cliffs were significantly younger than the inner treads,which tended to be younger than the outer treads. Radiocarbon dates from the regolithof 3854 to 4821 cal yr BP (2σ range) indicated maximum rates of cliff recession of ~0.1mm/year, which suggests the onset of terrace formation prior to the last glacialmaximum. Age, angularity and size of clasts, together with planation across bedrockstructures and the seepage of groundwater from the cliff foot, all support a processbasedconceptual model of cryoplanation terrace development in which frostweathering leads to parallel cliff recession and hence terrace extension. Theavailability of groundwater during autumn freeze-back is viewed as critical for frostwedging and/or the growth of segregation ice during prolonged winter frost penetration.Permafrost promotes cryoplanation by providing an impermeable frost table beneaththe active layer, focusing groundwater flow, and supplying water for sediment transportby solifluction across the tread. Snowbeds are considered an effect rather than acause of cryoplanation terraces and cryoplanation is seen as distinct from nivation.

    AB - Schmidt-hammer exposure-age dating (SHD) of boulders on cryoplanation terracetreads and associated bedrock cliff faces revealed Holocene ages ranging from 0 ±825 to 8890 ± 1185 yr. The cliffs were significantly younger than the inner treads,which tended to be younger than the outer treads. Radiocarbon dates from the regolithof 3854 to 4821 cal yr BP (2σ range) indicated maximum rates of cliff recession of ~0.1mm/year, which suggests the onset of terrace formation prior to the last glacialmaximum. Age, angularity and size of clasts, together with planation across bedrockstructures and the seepage of groundwater from the cliff foot, all support a processbasedconceptual model of cryoplanation terrace development in which frostweathering leads to parallel cliff recession and hence terrace extension. Theavailability of groundwater during autumn freeze-back is viewed as critical for frostwedging and/or the growth of segregation ice during prolonged winter frost penetration.Permafrost promotes cryoplanation by providing an impermeable frost table beneaththe active layer, focusing groundwater flow, and supplying water for sediment transportby solifluction across the tread. Snowbeds are considered an effect rather than acause of cryoplanation terraces and cryoplanation is seen as distinct from nivation.

    KW - cryoplanation terraces

    KW - Schmidt-hammer exposure-age dating

    KW - mountain permafrost

    KW - periglacial processes

    KW - alpine landform development

    KW - frost weathering

    KW - nivation

    M3 - Article

    JO - Quaternary Research

    T2 - Quaternary Research

    JF - Quaternary Research

    SN - 0033-5894

    ER -