A geological view of drumlins in Ireland

AM MCCABE, GF DARDIS

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    Facies modelling of the internal structure of drumlins has resulted in recognition of five major facies associations within the Irish drumlin belt. The facies associations are linked with a sequence of depositional events during the last deglacial phase (ca. 20-16 ka BP). Drumlin sediments were formed by basal till deposition, subglacial fluvial-lacustrine sedimentation, sheet flow, debris flow and subglacial cavity deposition. Subglacial deposition was initiated by the infilling and blocking of subglacial networks which caused a reduction in hydraulic transmissibility at the base of the ice sheet prior to drumlinisation. Drumlins then formed as subglacial erosional forms during surge-type events when subglacial hydraulic transportational processes were active and sediment fluxes to the ice margins were high. It is argued on geologic evidence that basal boundary conditions of this type coupled with high rates of ice wastage by calving at the ice margin contributed to rapid disintegration of the last ice sheet in western Britain.
    LanguageEnglish
    Pages169-177
    JournalQUATERNARY SCIENCE REVIEWS
    Volume8
    Issue number2
    DOIs
    Publication statusPublished - 1989

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    drumlin
    ice margin
    last ice sheet
    hydraulics
    sheet flow
    debris flow
    sediment
    ice sheet
    cavity
    boundary condition
    sedimentation
    ice
    modeling

    Cite this

    MCCABE, AM ; DARDIS, GF. / A geological view of drumlins in Ireland. 1989 ; Vol. 8, No. 2. pp. 169-177.
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    abstract = "Facies modelling of the internal structure of drumlins has resulted in recognition of five major facies associations within the Irish drumlin belt. The facies associations are linked with a sequence of depositional events during the last deglacial phase (ca. 20-16 ka BP). Drumlin sediments were formed by basal till deposition, subglacial fluvial-lacustrine sedimentation, sheet flow, debris flow and subglacial cavity deposition. Subglacial deposition was initiated by the infilling and blocking of subglacial networks which caused a reduction in hydraulic transmissibility at the base of the ice sheet prior to drumlinisation. Drumlins then formed as subglacial erosional forms during surge-type events when subglacial hydraulic transportational processes were active and sediment fluxes to the ice margins were high. It is argued on geologic evidence that basal boundary conditions of this type coupled with high rates of ice wastage by calving at the ice margin contributed to rapid disintegration of the last ice sheet in western Britain.",
    author = "AM MCCABE and GF DARDIS",
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    MCCABE, AM & DARDIS, GF 1989, 'A geological view of drumlins in Ireland', vol. 8, no. 2, pp. 169-177. https://doi.org/10.1016/0277-3791(89)90005-X

    A geological view of drumlins in Ireland. / MCCABE, AM; DARDIS, GF.

    Vol. 8, No. 2, 1989, p. 169-177.

    Research output: Contribution to journalArticle

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    AU - MCCABE, AM

    AU - DARDIS, GF

    PY - 1989

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    AB - Facies modelling of the internal structure of drumlins has resulted in recognition of five major facies associations within the Irish drumlin belt. The facies associations are linked with a sequence of depositional events during the last deglacial phase (ca. 20-16 ka BP). Drumlin sediments were formed by basal till deposition, subglacial fluvial-lacustrine sedimentation, sheet flow, debris flow and subglacial cavity deposition. Subglacial deposition was initiated by the infilling and blocking of subglacial networks which caused a reduction in hydraulic transmissibility at the base of the ice sheet prior to drumlinisation. Drumlins then formed as subglacial erosional forms during surge-type events when subglacial hydraulic transportational processes were active and sediment fluxes to the ice margins were high. It is argued on geologic evidence that basal boundary conditions of this type coupled with high rates of ice wastage by calving at the ice margin contributed to rapid disintegration of the last ice sheet in western Britain.

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