georefid:2011-087669SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1002/jqs.14792011-01-01publicationgeorefid:2011-087669doi:10.1002/jqs.1479Li GangNanjing University, Key Laboratory of Coastal and Island Development, Nanjing, ChinaauthorPiper, David J. W.Geological Survey of Canada (Atlantic), CanadaauthorCalvin Campbell, D.authorJohn Wiley and Sons for the Quaternary Research Association, Chichester, United KingdompublisherdocumentHardcopyJQS. Journal of Quaternary Science26 (5)511-522The 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.completedQuaternary geologyApplied geophysicsArctic OceanBaffin BayCanadaCenozoicclastic sedimentscoresEastern Canadageophysical methodsgeophysical profilesgeophysical surveysglacial environmentglacial extentglaciationglaciomarine environmentLancaster SoundLeg 105lithostratigraphymarine environmentmarine sedimentsNunavutOcean Drilling ProgramODP Site 645paleoenvironmentPleistoceneQuaternarysedimentsseismic methodsseismic profilesseismic stratigraphysubmarine fanssurveystillurn:org.iodp:exp:105urnlargerWorkCitationcampaignurn:org.iodp:exp:105:site:645urnlargerWorkCitationstudyurn:org.iodp:exp:105urnlargerWorkCitationcampaignEnglishgeoscientificInformation-73.0000-64.392470.273073.3000Supplemental information/data is available in the online version of this article