Ice-flow stages and glacial bedforms in north central Ireland: a record of rapid environmental change during the last glacial termination

AM McCabe, J Knight, SG McCarron

    Research output: Contribution to journalArticle

    41 Citations (Scopus)

    Abstract

    Satellite imagery is a useful tool to assess large-scale (>103km2) geological patterns. Satellite imagery of north central Ireland shows cross-cut and overprinted subglacial bedform patterns. Bedform lineations, supported by sedimentary evidence, are used to reconstruct four ice-flow stages (named A-D) during the termination of the last (Devensian) glaciation (22 000–13 000 radiocarbon (14C) years BP). Flow stage A relates to southwesterly flow of Scottish ice across eastern Ireland. Flow stage B, during the last glacial maximum (c. 25 000–22 000 14C years BP), records southeasterly ice-flow from dispersal centres in northern parts of Ireland. Transverse subglacial ridges (Rogen moraines) formed during stage B are the largest area of this ridge type in western Europe. Flow stage C records erosional headcutting in the Rogen moraine field and sediment streamlining (drumlinization) by ice streams drawn into the Irish Sea Basin. This flow stage is constrained by AMS radiocarbon dates from marine microfaunas to around 14 500 14C years BP. Flow stage D records drumlinization from an inland centre in the Lough Neagh Basin. Overall bedform patterns can be used to reconstruct ice mass history and evaluate controls on ice activity, including millennial-scale changes in amphi-North Atlantic climate. Field evidence of bedform relationships also casts doubt on current concepts of drumlinization and the role of pervasive sediment deformation in glacial systems.
    LanguageEnglish
    Pages63-72
    JournalJournal of the Geological Society
    Volume156
    Issue numberPart 1
    DOIs
    Publication statusPublished - Feb 1999

    Fingerprint

    ice flow
    bedform
    Last Glacial
    environmental change
    ice
    satellite imagery
    Devensian
    ice stream
    accelerator mass spectrometry
    moraine
    lineation
    Last Glacial Maximum
    basin
    sediment
    glaciation
    climate
    history

    Cite this

    @article{0be51257a0874a819a4bba9da413051b,
    title = "Ice-flow stages and glacial bedforms in north central Ireland: a record of rapid environmental change during the last glacial termination",
    abstract = "Satellite imagery is a useful tool to assess large-scale (>103km2) geological patterns. Satellite imagery of north central Ireland shows cross-cut and overprinted subglacial bedform patterns. Bedform lineations, supported by sedimentary evidence, are used to reconstruct four ice-flow stages (named A-D) during the termination of the last (Devensian) glaciation (22 000–13 000 radiocarbon (14C) years BP). Flow stage A relates to southwesterly flow of Scottish ice across eastern Ireland. Flow stage B, during the last glacial maximum (c. 25 000–22 000 14C years BP), records southeasterly ice-flow from dispersal centres in northern parts of Ireland. Transverse subglacial ridges (Rogen moraines) formed during stage B are the largest area of this ridge type in western Europe. Flow stage C records erosional headcutting in the Rogen moraine field and sediment streamlining (drumlinization) by ice streams drawn into the Irish Sea Basin. This flow stage is constrained by AMS radiocarbon dates from marine microfaunas to around 14 500 14C years BP. Flow stage D records drumlinization from an inland centre in the Lough Neagh Basin. Overall bedform patterns can be used to reconstruct ice mass history and evaluate controls on ice activity, including millennial-scale changes in amphi-North Atlantic climate. Field evidence of bedform relationships also casts doubt on current concepts of drumlinization and the role of pervasive sediment deformation in glacial systems.",
    author = "AM McCabe and J Knight and SG McCarron",
    year = "1999",
    month = "2",
    doi = "10.1144/gsjgs.156.1.0063",
    language = "English",
    volume = "156",
    pages = "63--72",
    journal = "Journal of the Geological Society",
    issn = "0016-7649",
    number = "Part 1",

    }

    Ice-flow stages and glacial bedforms in north central Ireland: a record of rapid environmental change during the last glacial termination. / McCabe, AM; Knight, J; McCarron, SG.

    In: Journal of the Geological Society, Vol. 156, No. Part 1, 02.1999, p. 63-72.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Ice-flow stages and glacial bedforms in north central Ireland: a record of rapid environmental change during the last glacial termination

    AU - McCabe, AM

    AU - Knight, J

    AU - McCarron, SG

    PY - 1999/2

    Y1 - 1999/2

    N2 - Satellite imagery is a useful tool to assess large-scale (>103km2) geological patterns. Satellite imagery of north central Ireland shows cross-cut and overprinted subglacial bedform patterns. Bedform lineations, supported by sedimentary evidence, are used to reconstruct four ice-flow stages (named A-D) during the termination of the last (Devensian) glaciation (22 000–13 000 radiocarbon (14C) years BP). Flow stage A relates to southwesterly flow of Scottish ice across eastern Ireland. Flow stage B, during the last glacial maximum (c. 25 000–22 000 14C years BP), records southeasterly ice-flow from dispersal centres in northern parts of Ireland. Transverse subglacial ridges (Rogen moraines) formed during stage B are the largest area of this ridge type in western Europe. Flow stage C records erosional headcutting in the Rogen moraine field and sediment streamlining (drumlinization) by ice streams drawn into the Irish Sea Basin. This flow stage is constrained by AMS radiocarbon dates from marine microfaunas to around 14 500 14C years BP. Flow stage D records drumlinization from an inland centre in the Lough Neagh Basin. Overall bedform patterns can be used to reconstruct ice mass history and evaluate controls on ice activity, including millennial-scale changes in amphi-North Atlantic climate. Field evidence of bedform relationships also casts doubt on current concepts of drumlinization and the role of pervasive sediment deformation in glacial systems.

    AB - Satellite imagery is a useful tool to assess large-scale (>103km2) geological patterns. Satellite imagery of north central Ireland shows cross-cut and overprinted subglacial bedform patterns. Bedform lineations, supported by sedimentary evidence, are used to reconstruct four ice-flow stages (named A-D) during the termination of the last (Devensian) glaciation (22 000–13 000 radiocarbon (14C) years BP). Flow stage A relates to southwesterly flow of Scottish ice across eastern Ireland. Flow stage B, during the last glacial maximum (c. 25 000–22 000 14C years BP), records southeasterly ice-flow from dispersal centres in northern parts of Ireland. Transverse subglacial ridges (Rogen moraines) formed during stage B are the largest area of this ridge type in western Europe. Flow stage C records erosional headcutting in the Rogen moraine field and sediment streamlining (drumlinization) by ice streams drawn into the Irish Sea Basin. This flow stage is constrained by AMS radiocarbon dates from marine microfaunas to around 14 500 14C years BP. Flow stage D records drumlinization from an inland centre in the Lough Neagh Basin. Overall bedform patterns can be used to reconstruct ice mass history and evaluate controls on ice activity, including millennial-scale changes in amphi-North Atlantic climate. Field evidence of bedform relationships also casts doubt on current concepts of drumlinization and the role of pervasive sediment deformation in glacial systems.

    U2 - 10.1144/gsjgs.156.1.0063

    DO - 10.1144/gsjgs.156.1.0063

    M3 - Article

    VL - 156

    SP - 63

    EP - 72

    JO - Journal of the Geological Society

    T2 - Journal of the Geological Society

    JF - Journal of the Geological Society

    SN - 0016-7649

    IS - Part 1

    ER -