georefid:2007-120377SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.3133/of2007-1047.srp020<gco:CharacterString>Antarctic ice-rafted detritus (IRD) in the South Atlantic; indicators of iceshelf dynamics or ocean surface conditions?</gco:CharacterString>2007-01-01publicationgeorefid:2007-120377doi:10.3133/of2007-1047.srp020Nielsen, Simon H. H.University of Florida, Department of Geological Sciences, Gainesville, FL, United StatesauthorHodell, D. A.authorU. S. Geological Survey, Reston, VA, United StatespublisherdocumentDigitalIn: Cooper, Alan (editor), Raymond, Carol (editor), Antarctica; a keystone in a changing world; online proceedings for the Tenth international symposium on Antarctic earth sciencesOF 2007-1047Ocean sediment core TN057-13PC4/ODP1094, from the Atlantic sector of the Southern Ocean, contains elevated lithogenic material in sections representing the last glacial period compared to the Holocene. This ice-rafted detritus is mainly comprised of volcanic glass and ash, but has a significant input of what was previously interpreted as quartz during peak intervals (Kanfoush et al., 2000, 2002). Our analysis of these clear mineral grains indicates that most are plagioclase, and that South Sandwich Islands is the predominant source, similar to that inferred for the volcanic glass (Nielsen et al., in review). In addition, quartz and feldspar with possible Antarctic origin occur in conjunction with postulated episodes of Antarctic deglaciation. We conclude that while sea ice was the dominant ice rafting agent in the Polar Frontal Zone of the South Atlantic during the last glacial period, the Holocene IRD variability may reflect Antarctic ice sheet dynamics.completedOceanographyQuaternary geologyAtlantic OceanCenozoicdetritusdynamicselectron probe dataglacial geologyHoloceneice raftingice shelvesLeg 177marine sedimentsmineral compositionOcean Drilling Programpaleo-oceanographyQuaternarysediment transportsedimentationsedimentsSouth AtlanticSouthern OceanUSGSurn:org.iodp:exp:177urnlargerWorkCitationcampaignEnglishgeoscientificInformation5.000014.0000-54.0000-40.5600application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://pubs.usgs.gov/of/2007/1047/srp/srp020/of2007-1047srp020.pdfdownload