georefid:2002-014638SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2002-014638<gco:CharacterString>Deep-sea paleotemperature record of extreme warmth during the Cretaceous</gco:CharacterString>2002-01-01publicationgeorefid:2002-014638Huber, Brian T.Smithsonian Institution, Department of Paleobiology, Washington, DC, United StatesauthorNorris, Richard D.Woods Hole Oceanographic Institution, United StatesauthorMacLeod, Kenneth G.University of Missouri at Columbia, United StatesauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)30 (2)123-126Oxygen isotope analyses of well-preserved foraminifera from Blake Nose (30 degrees N paleolatitude, North Atlantic) and globally distributed deep-sea sites provide a long-term paleotemperature record for the late Albian-Maastrichtian interval that is difficult to reconcile with the existence of significant Cretaceous ice sheets. Given reasonable assumptions about the isotopic composition of Cretaceous seawater, our results suggest that middle bathyal water temperatures at Blake Nose increased from approximately 12 degrees C in the late Albian through middle Cenomanian to a maximum of 20 degrees C during the latest Cenomanian and earliest Turonian. Bottom waters were again approximately 12 degrees C during the middle Campanian and cooled to a minimum of 9 degrees C during the Maastrichtian. Correlative middle bathyal foraminifera from other ocean basins yield paleotemperature estimates that are very similar to those from Blake Nose. Comparison of global bottom-water temperatures and latitudinal thermal gradients suggests that global climate changed from a warm greenhouse state during the late Albian through late Cenomanian to a hot greenhouse phase during the latest Cenomanian through early Campanian, then to cool greenhouse conditions during the mid-Campanian through Maastrichtian.completedStratigraphyAntarctic OceanAtlantic Oceanbenthic taxabiochemistryBlake NoseBlake Plateauclimate changecoresCretaceousDeep Sea Drilling Projectdeep-sea environmentDSDP Site 511Foraminiferageochemistrygreenhouse effectInvertebrataIPODisotope ratiosisotopesLeg 113Leg 171BLeg 71marine environmentmarine sedimentsMesozoicmicrofossilsNorth AtlanticO-18/O-16Ocean Drilling ProgramODP Site 1050ODP Site 690oxygenpaleo-oceanographypaleocirculationpaleoclimatologypaleoecologypaleogeographypaleolatitudepaleomagnetismpaleotemperatureplanktonic taxaProtistasedimentsstable isotopesurn:org.iodp:exp:113urnlargerWorkCitationcampaignurn:org.iodp:exp:171BurnlargerWorkCitationcampaignurn:org.iodp:exp:71urnlargerWorkCitationcampaignurn:org.iodp:exp:71:site:511urnlargerWorkCitationstudyurn:org.iodp:exp:71urnlargerWorkCitationcampaignurn:org.iodp:exp:171B:site:1050urnlargerWorkCitationstudyurn:org.iodp:exp:171BurnlargerWorkCitationcampaignurn:org.iodp:exp:113:site:690urnlargerWorkCitationstudyurn:org.iodp:exp:113urnlargerWorkCitationcampaignEnglishgeoscientificInformation-76.14061.1218-65.093830.0600With GSA Data Repository Item 200208