New data for the Last Glacial Maximum in Great Britain and Ireland

DQ Bowen, FM Phillips, AM McCabe, PC Knutz, GA Sykes

    Research output: Contribution to journalArticle

    235 Citations (Scopus)

    Abstract

    Understanding the history of the British and Irish Ice Sheet (BIIS) at the Last Glacial Maximum (LGM) has been advanced by new approaches, in particular, by cosmogenic nuclide surface-exposure dating, aminostratigraphy of `shelly' glacial deposits, AM S radiocarbon dating, and the evidence from continental margin marine cores, all of which supersede the previously weak geochronologic control. It was formerly believed that Great Britain and Ireland was largely ice free between the last interglacial (oxygen isotope sub-stage 5e) and the Late Devensian, when the LGM occurred. As such the BIIS was effectively out of phase with Laurentide and Scandinavian ice sheets, as well as inferences of ice volume from oxygen isotope stratigraphy. The BIIS during the Late Devensian maximum was also perceived as having been relatively stationary. New evidence shows that the LGM was an important event during the evolution of an earlier BIIS when the extent of ice was greater. Repeated iceberg rafting events over the past 50 ka are shown by marine cores, while the derivative inference of numerous corresponding glacial advances is supported by several clusters of Cl-36 ages on glaciated surfaces and glacial boulders, that are indicative of deglacial events between 40 and 12 ka. These appear to be associated with Heinrich events, the earliest being inferred as Heinrich 4 at about 40 ka. During this advance, the BIIS and Scandinavian Ice Sheet (SIS) were in contact and all of Ireland was glaciated. The ice sheet appears to have fluctuated several times between 40 and 25 ka, although evidence for this is poorly preserved. But the Cl-36 and C-14 evidence is clear that the BIIS reached its LGM maximum size about 22 ka, soon after Heinrich Event 2, when the BIIS and SIS were not in contact. One cluster of Cl-36 and C-14 ages, at 21.4 +/- 1.3 ka, records an initial pulse of deglaciation that was followed by extensive deglaciation about 17.4 +/- 0.4 ka, just before Heinrich Event 1, when the ice sheet readvanced. Contrary to previous views, the BITS probably existed throughout much of Devensian time as a mobile and sensitive ice sheet, during which the LGM advance was but one important event. In places, glacial deposits of the earlier Devensian glaciation have previously been incorrectly identified as products of the later LGM glaciation.
    LanguageEnglish
    Pages89-101
    JournalQuaternary Science Reviews
    Volume21
    Issue number1-3
    DOIs
    Publication statusPublished - Jan 2002

    Fingerprint

    Last Glacial Maximum
    ice sheet
    Devensian
    Scandinavian Ice Sheet
    Heinrich event
    glacial deposit
    deglaciation
    ice
    glaciation
    oxygen isotope
    Laurentide Ice Sheet
    Last Interglacial
    iceberg
    radiocarbon dating
    continental margin
    stratigraphy
    history

    Cite this

    Bowen, DQ., Phillips, FM., McCabe, AM., Knutz, PC., & Sykes, GA. (2002). New data for the Last Glacial Maximum in Great Britain and Ireland. Quaternary Science Reviews, 21(1-3), 89-101. https://doi.org/10.1016/S0277-3791(01)00102-0
    Bowen, DQ ; Phillips, FM ; McCabe, AM ; Knutz, PC ; Sykes, GA. / New data for the Last Glacial Maximum in Great Britain and Ireland. In: Quaternary Science Reviews. 2002 ; Vol. 21, No. 1-3. pp. 89-101.
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    Bowen, DQ, Phillips, FM, McCabe, AM, Knutz, PC & Sykes, GA 2002, 'New data for the Last Glacial Maximum in Great Britain and Ireland', Quaternary Science Reviews, vol. 21, no. 1-3, pp. 89-101. https://doi.org/10.1016/S0277-3791(01)00102-0

    New data for the Last Glacial Maximum in Great Britain and Ireland. / Bowen, DQ; Phillips, FM; McCabe, AM; Knutz, PC; Sykes, GA.

    In: Quaternary Science Reviews, Vol. 21, No. 1-3, 01.2002, p. 89-101.

    Research output: Contribution to journalArticle

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