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dc.contributor.authorGilbert, Graham Lewis
dc.contributor.authorCable, Stefanie
dc.contributor.authorThiel, Christine
dc.contributor.authorChristiansen, Hanne H
dc.contributor.authorElberling, Bo
dc.date.accessioned2018-04-18T09:21:38Z
dc.date.available2018-04-18T09:21:38Z
dc.date.issued2017-05-30
dc.identifier.issn1994-0416en_US
dc.identifier.urihttps://hdl.handle.net/1956/17625
dc.description.abstractThe Zackenberg River delta is located in northeast Greenland (74°30′ N, 20°30′ E) at the outlet of the Zackenberg fjord valley. The fjord-valley fill consists of a series of terraced deltaic deposits (ca. 2 km2) formed during relative sea-level (RSL) fall. We investigated the deposits using sedimentological and cryostratigraphic techniques together with optically stimulated luminescence (OSL) dating. We identify four facies associations in sections (4 to 22 m in height) exposed along the modern Zackenberg River and coast. Facies associations relate to (I) overriding glaciers, (II) retreating glaciers and quiescent glaciomarine conditions, (III) delta progradation in a fjord valley, and (IV) fluvial activity and niveo-aeolian processes. Pore, layered, and suspended cryofacies are identified in two 20 m deep ice-bonded sediment cores. The cryofacies distribution, together with low overall ground-ice content, indicates that permafrost is predominately epigenetic in these deposits. Fourteen OSL ages constrain the deposition of the cored deposits to between approximately 13 and 11 ka, immediately following deglaciation. The timing of permafrost aggradation was closely related to delta progradation and began following the subaerial exposure of the delta plain (ca. 11 ka). Our results reveal information concerning the interplay between deglaciation, RSL change, sedimentation, permafrost aggradation, and the timing of these events. These findings have implications for the timing and mode of permafrost aggradation in other fjord valleys in northeast Greenland.en_US
dc.language.isoengeng
dc.publisherCopernicus Publicationsen_US
dc.rightsAttribution CC BYeng
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/eng
dc.titleCryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenlanden_US
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2017 The Author(s)en_US
dc.identifier.cristin1487859
dc.source.journalThe Cryosphere
dc.source.4011
dc.source.pagenumber1265-1282


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