georefid:2006-083958SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G22882.12006-01-01publicationgeorefid:2006-083958doi:10.1130/G22882.1Dumitrescu, MirelaIndiana University, Biogeochemical Laboratories, Bloomington, IN, United StatesauthorBrassell, Simon C.Royal Netherlands Institute for Sea Research (NIOZ), NetherlandsauthorSchouten, StefanauthorHopmans, Ellen C.authorSinninghe Damste, Jaap S.authorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)34 (10)833-836The Cretaceous has long been recognized as a time when greenhouse conditions were fueled by elevated atmospheric CO (sub 2) and accompanied by perturbations of the global carbon cycle described as oceanic anoxic events (OAEs). Yet, the magnitude and frequency of temperature change during this interval of warm and equable climate are poorly constrained. Here we present a high-resolution record of sea-surface temperatures (SSTs) reconstructed using the TEX (sub 86) paleothermometer for a sequence of early Aptian organic-rich sediments deposited during the first Cretaceous OAE (OAE1a) at Shatsky Rise in the tropical Pacific. SSTs range from approximately 30 to approximately 36 degrees C and include two prominent cooling episodes of approximately 4 degrees C. The cooler temperatures reflect significant temperature instability in the tropics likely triggered by changes in carbon cycling induced by enhanced burial of organic matter. SST instability recorded during the early Aptian in the Pacific is comparable to that reported for the late Albian-early Cenomanian in the Atlantic, suggesting that such climate perturbations may have recurred during the Cretaceous with concomitant consequences for biota and the marine environment.completedStratigraphyalgaeAptianbacteriaC-13/C-12carboncarbon cyclecoolingCretaceousDeep Sea Drilling ProjectDSDP Site 463geochemical cyclegeochemistrygeologic thermometryhigh-resolution methodsInvertebrataIPODisotope ratiosisotopesLeg 198Leg 62lower AptianLower Cretaceousmarine environmentmarine sedimentsMesozoicmicrofossilsNorth PacificNorthwest PacificOcean Drilling Programoceanic anoxic eventsODP Site 1207organic carbonPacific Oceanpaleo-oceanographypaleoclimatologypaleoecologypaleotemperaturePlantaeProtistaRadiolariasea-surface temperaturesedimentsShatsky Risestable isotopesTEX86tropical environmentWest Pacificurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:62urnlargerWorkCitationcampaignurn:org.iodp:exp:62:site:463urnlargerWorkCitationstudyurn:org.iodp:exp:62urnlargerWorkCitationcampaignurn:org.iodp:exp:198:site:1207urnlargerWorkCitationstudyurn:org.iodp:exp:198urnlargerWorkCitationcampaignEnglishgeoscientificInformation162.4500174.400421.210137.4800