The Quaternary Lancaster Sound trough-mouth fan, NW Baffin Bay
Article first published online: 31 MAY 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 26, Issue 5, pages 511–522, July 2011
How to Cite
Li, G., Piper, D. J.W. and Calvin Campbell, D. (2011), The Quaternary Lancaster Sound trough-mouth fan, NW Baffin Bay. J. Quaternary Sci., 26: 511–522. doi: 10.1002/jqs.1479
- Issue published online: 24 JUN 2011
- Article first published online: 31 MAY 2011
- Manuscript Accepted: 9 DEC 2010
- Manuscript Revised: 26 NOV 2010
- Manuscript Received: 19 AUG 2010
- glacigenic debris flow;
- trough-mouth fan;
- stacking patterns;
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. Copyright © 2011 John Wiley & Sons, Ltd.