Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations

Ian D. Goodwin, Jason L. Roberts, David M. Etheridge, John Hellstrom, Andrew D. Moy, Marta Ribo, Andrew M. Smith

    Research output: Chapter in Book/Report/Conference proceedingChapter

    3 Citations (Scopus)

    Abstract

    Rare jökulhlaup events, also known as subglacial lake outburst flood events, have been observed at the Law Dome ice margin and provide an insight into the physical characteristics of subglacial meltwater and drainage. The subglacial topography based on data from the BEDMAP2 and ICECAP projects, together with subsurface transects of the ice margin obtained using groundpenetrating radar, reveal several lakes and lake-like depressions and the drainage pathways of two jökulhlaup events. Oxygen isotope typing of the meltwater during the most recent (2014) jökulhlaup event, combined with ice margin stratigraphy, enable the identification of ice tunnel melt pathways that exploit the 30–90° dipping basal ice layering. The presence of subglacial meltwater beneath Law Dome during the Holocene to Glacial periods is confirmed by the dendritic drainage pattern in the subglacial morphology and extensive layers of basal regelation ice and subglacial carbonate precipitate deposits found within the Løken Moraines sediments. These subglacial carbonates, including ooid layers, formed from the mixing of glacial meltwater and seawater at 72 ka BP. The combined evidence indicates that the ocean discharge of subglacial meltwater may be variable and/or is periodically blocked by basal freezing events near the ice sheet terminus.
    Original languageEnglish
    Title of host publicationExploration of subsurface Antarctica
    Subtitle of host publicationuncovering past changes and modern processes
    EditorsM. J. Siegert, S. S. R. Jamieson, D. A. White
    Place of PublicationLondon
    PublisherGeological Society of London
    Pages215-230
    Number of pages16
    Volume461
    ISBN (Electronic)9781786203427
    ISBN (Print)9781786203229
    DOIs
    Publication statusPublished - 2018

    Publication series

    NameGeological Society special publications
    PublisherGeological Society Publishing House
    ISSN (Print)0305-8719

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