Facies of subglacial channel sedimentation in late-Pleistocene drumlins, Northern Ireland

GF DARDIS, AM MCCABE

    Research output: Contribution to journalArticle

    39 Citations (Scopus)

    Abstract

    The sedimentology of three sand-cored drumlins in central Ulster. Northern Ireland is described. The sand-cores of the drumlins consist of complex sequences of cohesive sediment gravity forms, grain-flow deposits, turbiditic sands and deltaic sands and gravels, showing complex fades relationships. The bulk of the sediments formed in water-filled cavities associated with a major subglacial meltwater escape route excavated in bedrock. The sand-cores are overlain by a streamlined carapace of basal melt-out till. A model is presented to account for spatial variations in faeies arrangement within the sand-cores. Three specific meltwater depositional subenvironments were recognised: (1) main channel axis, (2) main channel flank, and (3) minor tributary channel. The sand-cores formed prior to the main phase of basal melt-out till deposition and before drumlin streamlining.
    LanguageEnglish
    Pages263-278
    JournalBoreas
    Volume12
    Issue number4
    DOIs
    Publication statusPublished - Dec 1983

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    drumlin
    Pleistocene
    sedimentation
    sand
    meltwater
    melt
    cohesive sediment
    sand and gravel
    sedimentology
    tributary
    bedrock
    cavity
    spatial variation
    gravity
    sediment

    Cite this

    DARDIS, GF ; MCCABE, AM. / Facies of subglacial channel sedimentation in late-Pleistocene drumlins, Northern Ireland. In: Boreas. 1983 ; Vol. 12, No. 4. pp. 263-278.
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    abstract = "The sedimentology of three sand-cored drumlins in central Ulster. Northern Ireland is described. The sand-cores of the drumlins consist of complex sequences of cohesive sediment gravity forms, grain-flow deposits, turbiditic sands and deltaic sands and gravels, showing complex fades relationships. The bulk of the sediments formed in water-filled cavities associated with a major subglacial meltwater escape route excavated in bedrock. The sand-cores are overlain by a streamlined carapace of basal melt-out till. A model is presented to account for spatial variations in faeies arrangement within the sand-cores. Three specific meltwater depositional subenvironments were recognised: (1) main channel axis, (2) main channel flank, and (3) minor tributary channel. The sand-cores formed prior to the main phase of basal melt-out till deposition and before drumlin streamlining.",
    author = "GF DARDIS and AM MCCABE",
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    Facies of subglacial channel sedimentation in late-Pleistocene drumlins, Northern Ireland. / DARDIS, GF; MCCABE, AM.

    In: Boreas, Vol. 12, No. 4, 12.1983, p. 263-278.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Facies of subglacial channel sedimentation in late-Pleistocene drumlins, Northern Ireland

    AU - DARDIS, GF

    AU - MCCABE, AM

    PY - 1983/12

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    N2 - The sedimentology of three sand-cored drumlins in central Ulster. Northern Ireland is described. The sand-cores of the drumlins consist of complex sequences of cohesive sediment gravity forms, grain-flow deposits, turbiditic sands and deltaic sands and gravels, showing complex fades relationships. The bulk of the sediments formed in water-filled cavities associated with a major subglacial meltwater escape route excavated in bedrock. The sand-cores are overlain by a streamlined carapace of basal melt-out till. A model is presented to account for spatial variations in faeies arrangement within the sand-cores. Three specific meltwater depositional subenvironments were recognised: (1) main channel axis, (2) main channel flank, and (3) minor tributary channel. The sand-cores formed prior to the main phase of basal melt-out till deposition and before drumlin streamlining.

    AB - The sedimentology of three sand-cored drumlins in central Ulster. Northern Ireland is described. The sand-cores of the drumlins consist of complex sequences of cohesive sediment gravity forms, grain-flow deposits, turbiditic sands and deltaic sands and gravels, showing complex fades relationships. The bulk of the sediments formed in water-filled cavities associated with a major subglacial meltwater escape route excavated in bedrock. The sand-cores are overlain by a streamlined carapace of basal melt-out till. A model is presented to account for spatial variations in faeies arrangement within the sand-cores. Three specific meltwater depositional subenvironments were recognised: (1) main channel axis, (2) main channel flank, and (3) minor tributary channel. The sand-cores formed prior to the main phase of basal melt-out till deposition and before drumlin streamlining.

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