Large subglacial lake beneath the Laurentide Ice Sheet inferred from sedimentary sequences

Poul Christoffersen, Slawek Tulaczyk, Nigel J. Wattrus, Justin Peterson, Nadine Quintana-Krupinski, Chris D. Clark, Charlotte Sjunneskog

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Subglacial lakes identified beneath the Antarctic Ice Sheet belong to a rare category of unexplored environments on Earth's surface. The key to understanding the origin and longevity of subglacial lakes is likely contained in their sedimentary sequences. Here we explore the nature of a sedimentary succession in a deep tectonic trough identified as a prime candidate for a large subglacial paleolake. The trough is the 100-km-long, 620-m-deep Christie Bay, located in the east arm of the Great Slave Lake, Canada. High-resolution seismic reflection data and short sediment cores collected in the deep trough show a 150-m-thick sequence of fine-grained sedimentary lake fill separating glacial ice-contact deposits from draped Holocene lake sediments. We interpret this sequence to consist of sediments that accumulated in a subglacial lake that covered an area larger than 130 km2. The inferred presence of a subglacial paleolake is supported by results from hydrologic modeling of drainage pathways beneath the Laurentide Ice Sheet during the last glacial maximum. Our data point toward the existence of a dynamic subglacial lake environment where sediments were delivered by discharge of meltwater a subglacial water system. A core sample of the sedimentary lake fill in Christie Bay may elucidate whether living organisms exist in subglacial lakes.

Original languageEnglish (US)
Pages (from-to)563-566
Number of pages4
Issue number7
StatePublished - 2008


  • Basal water
  • Hydrology
  • Ice sheet
  • Sediment
  • Subglacial lake


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