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

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dc.contributor.authorGoodwin, IDen_AU
dc.contributor.authorRoberts, JLen_AU
dc.contributor.authorEtheridge, DMen_AU
dc.contributor.authorHellstrom, JCen_AU
dc.contributor.authorMoy, ADen_AU
dc.contributor.authorRibo, Men_AU
dc.contributor.authorSmith, AMen_AU
dc.date.accessioned2022-06-02T20:30:59Zen_AU
dc.date.available2022-06-02T20:30:59Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2022-05-18en_AU
dc.description.abstractRare 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 ground-penetrating 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. © 2018 The Author(s). Published by The Geological Society of London.en_AU
dc.identifier.booktitleExploration of subsurface Antarctica: uncovering past changes and modern processesen_AU
dc.identifier.citationGoodwin, I. D., Roberts, J. L., Etheridge, D. M., Hellstrom, J., Moy, A. D., Ribo, M., & Smith, A. M. (2018). Modern to Glacial Age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations. In Siegert, M. J., Jamieson, S. S. R., & White, D. A. (Eds.), Exploration of subsurface Antarctica: uncovering past changes and modern processes, (Vol. 461, pp. 215-230). Geological Society: London. doi:10.1144/SP461.16en_AU
dc.identifier.editorsSiegert, M. J., Jamieson, S. S. R., & White, D. A.en_AU
dc.identifier.isbn9781786203229en_AU
dc.identifier.issn2041-4927en_AU
dc.identifier.pagination215-230en_AU
dc.identifier.placeofpublicationLondon, UKen_AU
dc.identifier.urihttps://doi.org/10.1144/SP461.16en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13259en_AU
dc.identifier.volume461en_AU
dc.language.isoenen_AU
dc.publisherThe Geological Society of Londonen_AU
dc.relation.ispartofseriesSpecial Publications;461en_AU
dc.subjectAntarcticaen_AU
dc.subjectLakesen_AU
dc.subjectGlaciersen_AU
dc.subjectFloodsen_AU
dc.subjectDrainageen_AU
dc.subjectSedimentsen_AU
dc.subjectTopographyen_AU
dc.titleModern to Glacial Age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observationsen_AU
dc.typeBook chapteren_AU
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