SEDIS - Publications
Li Gang et al. (2011): The Quaternary Lancaster Sound trough-mouth fan, NW Baffin Bay
ODP 105 645
Nanjing University, Key Laboratory of Coastal and Island Development, Nanjing, China
Piper, David J. W.
Geological Survey of Canada (Atlantic), Canada
Calvin Campbell, D.
The Quaternary Lancaster Sound trough-mouth fan, NW Baffin Bay
JQS. Journal of Quaternary Science
John Wiley and Sons for the Quaternary Research Association, Chichester, United Kingdom
The development of the Lancaster Sound Trough Mouth Fan (TMF) and glacial history in Arctic Canada were studied using a high-resolution seismic profile across the entire fan and two piston cores. Stacked tills separated by erosion surfaces on the shelf pass seaward through till deltas into thick transparent glacigenic debris flow (GDF) deposits on the slope, separated by thin, well-stratified glaciomarine layers. An age model was built by ties to the Ocean Drilling Program Site 645. The deepest GDF on the seismic profile was indicative of the onset of shelf-crossing glaciation in the early Pleistocene. The transition of the growth of Lancaster Sound TMF from an aggradational sequence (unit M) to an aggradational-progradational sequence (unit F) occurred at the middle Pleistocene transition in glacial cyclicity. In the most recent glacial cycle, GDF sheets were deposited during Heinrich events 4 and 2 according to the correlation of the main detrital carbonate beds in two piston cores. The outmost till wedge reflects the maximum advance of the grounding glacier, far seaward of previously proposed Last Glacial Maximum ice extent. Abstract Copyright (2010), John Wiley & Sons, Ltd.
Quaternary geology; Applied geophysics; Arctic Ocean; Baffin Bay; Canada; Cenozoic; clastic sediments; cores; Eastern Canada; geophysical methods; geophysical profiles; geophysical surveys; glacial environment; glacial extent; glaciation; glaciomarine environment; Lancaster Sound; Leg 105; lithostratigraphy; marine environment; marine sediments; Nunavut; Ocean Drilling Program; ODP Site 645; paleoenvironment; Pleistocene; Quaternary; sediments; seismic methods; seismic profiles; seismic stratigraphy; submarine fans; surveys; till;
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