georefid:2007-005643SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/2004PA001082<gco:CharacterString>Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene</gco:CharacterString>2005-01-01publicationgeorefid:2007-005643doi:10.1029/2004PA001082Anderson, L. D.University of California at Santa Cruz, Institute of Marine Sciences, Santa Cruz, CA, United StatesauthorDelaney, M. L.authorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentDigitalPaleoceanography20 (3)Ocean Drilling Program (ODP) Site 1090, on the Agulhas Ridge in the South Atlantic sector of the Southern Ocean, is ideally located to capture changes in Southern Ocean circulation patterns. Using samples taken from cored sediments, we construct multiproxy records of productivity (biogenic barium (Ba (sub ex) ), opal, and CaCO (sub 3) mass accumulation rates (MARs)), nutrient and organic carbon burial, and redox conditions (U and Mn enrichments) to investigate hydrographic conditions associated with climatic shifts from the Oligocene through the early Miocene. Orbitally induced cyclicity in U and Mn enrichments (100 kyr) suggests shifts in deepwater characteristics. However, CaCO (sub 3) dissolution coincident with low U and Mn enrichments does not indicate low-oxygen, corrosive waters similar to modern conditions. (mod. journ. abst.)completedStratigraphyIsotope geochemistryactinidesAgulhas RidgeAntarctic Circumpolar Currentcalcium carbonateCenozoicclimate forcingForaminiferaInvertebrataisotope ratiosisotopesLeg 177manganesemarine environmentmetalsmicrofossilsMioceneNeogeneO-18/O-16Ocean Drilling ProgramODP Site 1090Oligoceneorbital forcingoxygenpaleo-oceanographypaleoclimatologypaleoenvironmentPaleogeneProtistaSouthern Oceanstable isotopesTertiaryuraniumurn:org.iodp:exp:177urnlargerWorkCitationcampaignurn:org.iodp:exp:177:site:1090urnlargerWorkCitationstudyurn:org.iodp:exp:177urnlargerWorkCitationcampaignEnglishgeoscientificInformation8.53598.5359-42.5449-42.5449application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.agu.org/journals/pa/pa0503/2004PA001082/2004PA001082.pdfdownload