georefid:2009-020473SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-07-06T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G25025A.12009-01-01publicationgeorefid:2009-020473doi:10.1130/G25025A.1Lopes, CrisLaboratorio de Energia e Geologia, Departamento de Geologia Marinha, Amadora, PortugalauthorMix, A. C.Oregon State University, United StatesauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)37 (1)79-82Massive discharges of freshwater from the glacial lake Missoula to the Northeast Pacific Ocean are thought to have sculpted the Channeled Scablands of eastern Washington and debouched via the Columbia River near 46 degrees N. The dynamics and timing of these events and their impact on northeast Pacific circulation remain uncertain. Here we date marine records of anomalous freshwater inputs to the ocean based on freshwater diatoms, oxygen isotopes in foraminifera, and radiocarbon data. Low-salinity plumes from the Columbia River reduced sea-surface salinities by as much as 6 psu (practical salinity units) more than 400 km away between 16 and 31 cal (calendar) ka B.P. Anomalously high abundances of freshwater diatoms in marine sediments from the region precede generally accepted dates for the existence of glacial Lake Missoula, implying that large flooding or freshwater routing events were common during the advance of the Cordilleran Ice Sheet and that such events require multiple sources.completedQuaternary geologyabsolute agealgaebiostratigraphyC-14carbonCenozoicChanneled ScablandColumbia RiverCordilleran ice sheetdatesdiatomsdischargeEast Pacificeastern WashingtonfloodsForaminiferafresh-water environmentglacial extentglacial featuresglacial geologyglacial lakesice movementInvertebrataisotopesLake MissoulalakesLeg 167marine sedimentsmegafloodsmicrofossilsNorth PacificNortheast PacificOcean Drilling ProgramODP Site 1019OregonPacific Oceanpaleo-oceanographypaleoecologypaleohydrologypaleosalinityPlantaePleistoceneProtistaQuaternaryradioactive isotopessalinitysea-surface salinitysedimentsUnited StatesWashingtonurn:org.iodp:exp:167urnlargerWorkCitationcampaignurn:org.iodp:exp:167:site:1019urnlargerWorkCitationstudyurn:org.iodp:exp:167urnlargerWorkCitationcampaignEnglishgeoscientificInformation-130.0000-120.000038.000050.0000With GSA Data Repository Item 2009018