Controls on the sedimentary architecture of a single event englacial esker: Skeiðarárjökull, Iceland

Matthew John Burke, John Woodward, Andrew J. Russell, P. Jay Fleisher, Palmer Bailey

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Eskers have been used to infer the dynamics and palaeo-hydrology of large ice sheets yet there are few suitable contemporary analogues for esker sedimentation during Quaternary glaciations. Consequently, models of esker sedimentation have been derived from morpho-sedimentary analyses of Quaternary eskers, but these lack rigorous constraints on their depositional timescales. We identify the controls on the large-scale sedimentary architecture of a large (>700 m long, 10°) inclined reflections, interpreted as backset accretion associated with large-scale bedform development; (4) down-flow dipping high-angle (>15°) inclined reflections, interpreted as foreset accretion associated with macroform progradation; (5) quasi-hyperbolic reflections, interpreted as zones of boulder clustering; and (6) zones of enhanced noise and EM signal attenuation, bounded on the upper surface by a continuous reflection sub-parallel to the ground surface, interpreted as buried ice associated with the conduit/channel base. These data suggest that deposition took place within a non-uniform englacial conduit, which has resulted in major up-flow to down-flow variations in sedimentary architecture. The complexities observed are a direct consequence of variations in sediment supply and the within-event evolution of conduit geometry. This study provides the first detailed insight into the large-scale sedimentary architecture of a single event jökulhlaup proto-esker.
Original languageEnglish
Pages (from-to)1829-1847
JournalQuaternary Science Reviews
Volume27
Issue number19-20
DOIs
Publication statusPublished - 2008

Fingerprint Dive into the research topics of 'Controls on the sedimentary architecture of a single event englacial esker: Skeiðarárjökull, Iceland'. Together they form a unique fingerprint.

Cite this