georefid:2008-124482SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G24999A.1<gco:CharacterString>Nd isotopic excursion across Cretaceous Ocean Anoxic Event 2 (Cenomanian-Turonian) in the tropical North Atlantic</gco:CharacterString>2008-01-01publicationgeorefid:2008-124482doi:10.1130/G24999A.1MacLeod, Kenneth G.University of Missouri, Department of Geological Sciences, Columbia, MO, United StatesauthorMartin, Ellen E.University of Florida, United StatesauthorBlair, Susanna W.authorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)36 (10)811-814Late Cretaceous fish debris from Demerara Rise exhibits a dramatic positive excursion of 8 epsilon (sub Nd) units during ocean anoxic event 2 (OAE2) that is superimposed on extremely low epsilon (sub Nd(t)) values (-14 to -16.5) observed throughout the rest of the studied interval. The OAE2 epsilon (sub Nd) excursion is the largest yet documented in marine sediments, and the majority of the shift is estimated to have occurred over <20 k.y. Low background epsilon (sub Nd) values on Demerara Rise are explained as the Nd isotopic signature of the South American craton, whereas eruptions of the Caribbean large igneous province or enhanced mixing of intermediate waters in the North Atlantic could have caused the excursion.completedStratigraphyIsotope geochemistryanaerobic environmentAtlantic Oceanblack shalecarbonate rocksCenomanianchalkChordataclastic rocksCretaceousDemerara Risegeochemical anomaliesgeochemistryisotope ratiosisotopesLeg 145Leg 171BLeg 207marine environmentMesozoicmetalsNd-144/Nd-143neodymiumNorth AtlanticNorthwest AtlanticOAE 2Ocean Drilling Programoceanic anoxic eventsODP Site 1050ODP Site 1258ODP Site 1259ODP Site 1260ODP Site 886Pacific Oceanpaleo-oceanographyPiscesrare earthssedimentary rocksstable isotopestropical environmentTuronianUpper CretaceousVertebrataurn:org.iodp:exp:145urnlargerWorkCitationcampaignurn:org.iodp:exp:171BurnlargerWorkCitationcampaignurn:org.iodp:exp:207urnlargerWorkCitationcampaignurn:org.iodp:exp:171B:site:1050urnlargerWorkCitationstudyurn:org.iodp:exp:171BurnlargerWorkCitationcampaignurn:org.iodp:exp:207:site:1258urnlargerWorkCitationstudyurn:org.iodp:exp:207urnlargerWorkCitationcampaignurn:org.iodp:exp:207:site:1259urnlargerWorkCitationstudyurn:org.iodp:exp:207urnlargerWorkCitationcampaignurn:org.iodp:exp:207:site:1260urnlargerWorkCitationstudyurn:org.iodp:exp:207urnlargerWorkCitationcampaignurn:org.iodp:exp:145:site:886urnlargerWorkCitationstudyurn:org.iodp:exp:145urnlargerWorkCitationcampaignEnglishgeoscientificInformation-168.1425-54.12009.160044.4123With GSA Data Repository Item 2008208