georefid:2003-069537SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/2001PA000659<gco:CharacterString>Biogeochemical changes within the Benguela Current upwelling system during the Matuyama diatom maximum; nitrogen isotope evidence from Ocean Drilling Program sites 1082 and 1084</gco:CharacterString>2002-01-01publicationgeorefid:2003-069537doi:10.1029/2001PA000659Robinson, Rebecca S.University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United StatesauthorMeyers, Philip A.authorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentDigitalPaleoceanography17 (4)The Matuyama Diatom Maximum (MDM) is a time of peak opal accumulation from 2.6 to 2.0 Ma within the Benguela Current upwelling system that was initiated by increased influence of Southern Ocean water on the eastern South Atlantic. This study measured opal, total organic carbon (TOC), and CaCO (sub 3) fluxes and C and N stable isotopes in sediments deposited from 2.4 to 1.95 Ma at Sites 1082 and 1084 to explore the biogeochemical dynamics within the Benguela region. The infusion of Southern Ocean water delivered dissolved nutrients and Southern Ocean flora and fauna. The bulk sediment (super 15) N records are taken to reflect changes in the (super 15) N of nitrate in the incoming water, where lower values at 2.4 Ma reflect less nitrate utilization in the Antarctic. (modified journ. abst.)completedStratigraphyIsotope geochemistryalgaeAtlantic OceanBenguela Currentbiogenic processesCenozoicdiatomsframework silicatesgeochemistryhydrochemistryisotope ratiosisotopesLeg 175Matuyama ChronmicrofossilsN-15/N-14NeogenenitrogenOcean Drilling ProgramODP Site 1082ODP Site 1084opalorganic compoundspaleo-oceanographypaleocirculationpaleocurrentsPlantaePliocenesea watersilica mineralssilicatesSouth AtlanticSouthern Oceanstable isotopesTertiarytotal organic carbonupper Cenozoicurn:org.iodp:exp:175urnlargerWorkCitationcampaignurn:org.iodp:exp:175:site:1082urnlargerWorkCitationstudyurn:org.iodp:exp:175urnlargerWorkCitationcampaignurn:org.iodp:exp:175:site:1084urnlargerWorkCitationstudyurn:org.iodp:exp:175urnlargerWorkCitationcampaignEnglishgeoscientificInformation-180.0000180.0000-90.000075.0000Atlantic OceanSouthern Oceanapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.agu.org/journals/pa/pa0204/2001PA000659/2001PA000659.pdfdownload