georefid:2012-085578SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1016/j.geobios.2011.04.001<gco:CharacterString>Gephyrocapsa occurrence during the middle Pleistocene transition in the northern Pacific Ocean (Shatsky Rise)</gco:CharacterString>2012-01-01publicationgeorefid:2012-085578doi:10.1016/j.geobios.2011.04.001Lupi, ClaudiaUniversita di Pavia, Dipartimento di Scienze della Terra e dell'Ambiente, Pavia, ItalyauthorBordiga, ManuelaauthorCobianchi, MiriamauthorElsevier on behalf of Universite Claude Bernard, Departement des Sciences de la Terre, Lyon, FrancepublisherdocumentHardcopyGeobios45 (2)209-217The gephyrocapsids, main component of the Pleistocene calcareous nannofossil assemblages, are here discussed as biostratigraphical and paleoclimate tools. The occurrence of the genus Gephyrocapsa is quantitatively analysed in the core ODP 198-1209B, collected in the NW Pacific Ocean. The studied stratigraphic succession covers a time interval including the Middle Pleistocene Transition (MPT), a highly investigated period characterized by important global climate changes. During the Pleistocene, Gephyrocapsa is extremely abundant and provides several bioevents used in biostratigraphy. In addition to the known standard events, we observe the occurrence of particular Gephyrocapsa morphogroups and significant changes in the relative abundance of G. caribbeanica. In the Early-Middle Pleistocene we identify four intervals based on the Gephyrocapsa content. Moreover, during the MPT, the stratigraphic distribution of Gephyrocapsa underlines a dominance of both the small morphogroup and the medium-sized G. caribbeanica that could be dependent on their paleoecology. Small Gephyrocapsa and G. caribbeanica seem to be more competitive than other coccolithophores during the global oceanographic variations and the re-organisation of the glacial-interglacial periodicity during the MPT. Abstract Copyright (2012) Elsevier, B.V.completedQuaternary geologyalgaebiostratigraphyCenozoicCoccolithophoraceaeGephyrocapsaLeg 198marine environmentmicrofossilsmiddle PleistocenemorphologyNorth PacificNorthwest PacificOcean Drilling ProgramODP Site 1209Pacific OceanpaleoclimatologypaleoecologypaleoenvironmentPlantaePleistoceneQuaternarySEM dataShatsky RiseWest Pacificurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:198:site:1209urnlargerWorkCitationstudyurn:org.iodp:exp:198urnlargerWorkCitationcampaignEnglishgeoscientificInformation158.3000158.310032.390032.4000Supplemental information/data is available in the online version of this article; includes 2 appendices