georefid:2013-008066SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/2011PA0021982012-01-01publicationgeorefid:2013-008066doi:10.1029/2011PA002198Murphy, Daniel P.Texas A&M University, Department of Oceanography, College Station, TX, United StatesauthorThomas, Deborah J.authorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentHardcopyPaleoceanography27 (1)The role that meridional overturning circulation (MOC) patterns played in poleward heat transport during the extreme warmth of the Early to Late Cretaceous is a fundamental and unresolved question in climate dynamics. In order to address this question we must determine where deep waters formed, and how they may have circulated during periods of extreme warmth. Here we present late Albian through Maastrichtian (105 to 65 Ma) Nd isotope records from Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) sites in the proto-Indian Ocean and the tropical Pacific. Comparison of these data with previously published records indicates deep-water formation in the Indian sector of the Southern Ocean began at least approximately 105 Ma, extending the record of high-latitude convection back into the Early Cretaceous prior to the peak warmth of the mid-Cretaceous. The growing body of data supports a mode of MOC in part characterized by high-latitude downwelling during the peak of greenhouse warmth of the Mesozoic and Cenozoic. However, this mode of MOC likely was characterized by numerous locations of deep convection that were regionally important, but not significant in terms of a globally overturning circulation due to paleogeographic and bathymetric barriers.completedStratigraphyIsotope geochemistryAlbianArgo abyssal plainclimate changeCretaceousdeep-water environmentExmouth PlateauGascoyne abyssal plaingreenhouse effectIndian Oceanisotope ratiosisotopesKerguelen PlateauLeg 122Leg 123Leg 183Leg 198Lower CretaceousMaestrichtianmarine environmentmass spectraMesozoicmetalsNd-144/Nd-143neodymiumNorth PacificNorthwest Pacificocean circulationOcean Drilling ProgramODP Site 1138ODP Site 1208ODP Site 763ODP Site 765ODP Site 766Pacific Oceanpaleo-oceanographypaleobathymetrypaleoclimatologypaleoenvironmentpaleogeographypaleolatituderare earthsShatsky RiseSouthern Oceanspectrastable isotopesthermal ionization mass spectratracersUpper CretaceousWest Pacificurn:org.iodp:exp:122urnlargerWorkCitationcampaignurn:org.iodp:exp:123urnlargerWorkCitationcampaignurn:org.iodp:exp:183urnlargerWorkCitationcampaignurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:183:site:1138urnlargerWorkCitationstudyurn:org.iodp:exp:183urnlargerWorkCitationcampaignurn:org.iodp:exp:198:site:1208urnlargerWorkCitationstudyurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:122:site:763urnlargerWorkCitationstudyurn:org.iodp:exp:122urnlargerWorkCitationcampaignurn:org.iodp:exp:123:site:765urnlargerWorkCitationstudyurn:org.iodp:exp:123urnlargerWorkCitationcampaignurn:org.iodp:exp:123:site:766urnlargerWorkCitationstudyurn:org.iodp:exp:123urnlargerWorkCitationcampaignEnglishgeoscientificInformation112.1231112.1232-20.3512-20.3511