georefid:2012-073228SEDIS 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=10.1666/11027.12012-01-01publicationgeorefid:2012-073228doi:10.1666/11027.1Birch, Heather S.Cardiff University, School of Earth and Ocean Sciences, Cardiff, United KingdomauthorCoxall, Helen K.authorPearson, Paul N.authorPaleontological Society, Lawrence, KS, United StatespublisherdocumentHardcopyPaleobiology38 (3)374-390The carbon stable isotope (delta (super 13) C) composition of the calcitic tests of planktonic foraminifera has an important role as a geochemical tracer of ocean carbon system changes associated with the Cretaceous/Paleogene (K/Pg) mass extinction event and its aftermath. Questions remain, however, about the extent of delta (super 13) C isotopic disequilibrium effects and the impact of depth habitat evolution on test calcite delta (super 13) C among rapidly evolving Paleocene species, and the influence this has on reconstructed surface-to-deep ocean dissolved inorganic carbon (DIC) gradients. A synthesis of new and existing multispecies data, on the relationship between delta (super 13) C and delta (super 18) O and test size, sheds light on these issues. Results suggest that early Paleocene species quickly radiated into a range of depths habitats in a thermally stratified water column. Negative delta (super 18) O gradients with increasing test size in some species of Praemurica suggest either ontogenetic or ecotypic dependence on calcification temperature that may reflect depth/light controlled variability in symbiont photosynthetic activity. The pattern of positive delta (super 13) C test-size correlations allows us to (1) identify metabolic disequilibrium delta (super 13) C effects in small foraminifera tests, as occur in the immediate aftermath of the K/Pg event, (2) constrain the timing of evolution of foraminiferal photosymbiosis to 63.5 Ma, approximately 0.9 Myr earlier than previously suggested, and (3) identify the apparent loss of symbiosis in a late-ranging morphotype of Praemurica. These findings have implications for interpreting delta (super 13) C DIC gradients at a resolution appropriate for incoming highly resolved K/Pg core records.completedInvertebrate paleontologyIsotope geochemistryAtlantic Oceanbiologic evolutionC-13/C-12carbonCenozoicDeep Sea Drilling ProjectdepthDSDP Site 384DSDP Site 528DSDP Site 577faunal listfaunal studiesForaminiferahabitatInvertebrataIPODisotope ratiosisotopesLeg 208Leg 43Leg 74Leg 86lower PaleocenemicrofossilsMorozovellamorphologyNorth AtlanticNorth PacificNorthwest PacificO-18/O-16Ocean Drilling ProgramODP Site 1262oxygenPacific OceanPaleocenepaleoecologypaleoenvironmentPaleogenepelagic environmentplanktonic taxaPraemuricaProtistaSEM dataShatsky RisesizeSouth Atlanticstable isotopessymbiosisTertiarytestsWalvis RidgeWest Pacificurn:org.iodp:exp:208urnlargerWorkCitationcampaignurn:org.iodp:exp:43urnlargerWorkCitationcampaignurn:org.iodp:exp:74urnlargerWorkCitationcampaignurn:org.iodp:exp:86urnlargerWorkCitationcampaignurn:org.iodp:exp:43:site:384urnlargerWorkCitationstudyurn:org.iodp:exp:43urnlargerWorkCitationcampaignurn:org.iodp:exp:74:site:528urnlargerWorkCitationstudyurn:org.iodp:exp:74urnlargerWorkCitationcampaignurn:org.iodp:exp:86:site:577urnlargerWorkCitationstudyurn:org.iodp:exp:86urnlargerWorkCitationcampaignurn:org.iodp:exp:208:site:1262urnlargerWorkCitationstudyurn:org.iodp:exp:208urnlargerWorkCitationcampaignEnglishgeoscientificInformation-51.3948157.4324-28.310040.2139Supplemental information/data is available in the online version of this article