Late Holocene solifluction history reconstructed using tephrochronology

Martin P. Kirkbride, Andrew J. Dugmore

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Phases of activity of four solifluction lobes at an altitude of 750-800 m are dated by tephrochronology at Snaefell, central eastern Iceland (64°48'N 15°33' E). The sample includes sorted lobes with tread gradients of 3-11° and unsorted (turf-banked terraces) in slope-foot locations. Trenches through lobe fronts reveal detailed internal structures picked out by multiple tephra layers. The tephras V1717, V1477, Ö1362, V870, Hekla-3 (2900 years BP) and Hekla-4 (3800 years BP) provide isochronous surfaces of known age whose deformation and disturbance indicate mass movement and/or cryoturbation of the soil cover. Undisturbed soil including the Hekla-3 tephra indicates an absence of solifluction prior to 2900 years BP. Several centuries after Hekla-3, gravel-rich horizons mark widespread frost heave and solifluction of hillslopes. Later stabilization of these lobes allowed the accumulation of aprons of aeolian sediment below lee-side risers. These aprons contain in situ mediaeval tephras, dating the inception of solifluction to a considerable time prior to Norse settlement. The likely period of this first phase of solifluction is the Later Bog Period of the Subatlantic, c. 2500-1000 years BP. The aprons are currently being overridden and deformed by solifluction lobes reactivated in the Little Ice Age.
    Original languageEnglish
    Pages (from-to)145-155
    Number of pages11
    JournalSpecial Publications. Geological Society of London
    Volume242
    DOIs
    Publication statusPublished - 2005

    Fingerprint

    tephrochronology
    solifluction
    Holocene
    Soils
    Gravel
    history
    Ice
    Sediments
    Stabilization
    tephra
    cryoturbation
    frost heave
    riser
    soil cover
    mass movement
    Medieval
    bog
    hillslope
    terrace
    trench

    Cite this

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    abstract = "Phases of activity of four solifluction lobes at an altitude of 750-800 m are dated by tephrochronology at Snaefell, central eastern Iceland (64°48'N 15°33' E). The sample includes sorted lobes with tread gradients of 3-11° and unsorted (turf-banked terraces) in slope-foot locations. Trenches through lobe fronts reveal detailed internal structures picked out by multiple tephra layers. The tephras V1717, V1477, {\"O}1362, V870, Hekla-3 (2900 years BP) and Hekla-4 (3800 years BP) provide isochronous surfaces of known age whose deformation and disturbance indicate mass movement and/or cryoturbation of the soil cover. Undisturbed soil including the Hekla-3 tephra indicates an absence of solifluction prior to 2900 years BP. Several centuries after Hekla-3, gravel-rich horizons mark widespread frost heave and solifluction of hillslopes. Later stabilization of these lobes allowed the accumulation of aprons of aeolian sediment below lee-side risers. These aprons contain in situ mediaeval tephras, dating the inception of solifluction to a considerable time prior to Norse settlement. The likely period of this first phase of solifluction is the Later Bog Period of the Subatlantic, c. 2500-1000 years BP. The aprons are currently being overridden and deformed by solifluction lobes reactivated in the Little Ice Age.",
    author = "Kirkbride, {Martin P.} and Dugmore, {Andrew J.}",
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    Late Holocene solifluction history reconstructed using tephrochronology. / Kirkbride, Martin P.; Dugmore, Andrew J.

    In: Special Publications. Geological Society of London, Vol. 242, 2005, p. 145-155.

    Research output: Contribution to journalArticle

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    PY - 2005

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