georefid:2012-095623SEDIS 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=10.1144/SP373.92012-01-01publicationgeorefid:2012-095623doi:10.1144/SP373.9Firth, J. V.Integrated Ocean Drilling Program, College Station, TX, United StatesauthorEldrett, J. S.Shell Exploration and Production, United StatesauthorHarding, I. C.University of Southampton, United KingdomauthorCoxall, H. K.Cardiff University, United KingdomauthorWade, B. S.Texas A&M University, United StatesauthorGeological Society of London, London, United KingdompublisherdocumentHardcopyGeological Society Special Publications3731-2Lower Eocene to Oligocene microfossil-rich hemipelagic sediments in ODP Hole 647A, southern Labrador Sea, provide a strategic section for resolving the early history of high North Atlantic climates and ocean circulation, and for correlating with carbonate-poor lower Cenozoic sediments in the Arctic and Nordic seas. Our new, integrated palaeomagneto- and multigroup biostratigraphy (63 dinoflagellate cyst, calcareous nannofossil, planktonic foraminifer and diatom datums) significantly improves Site 647 chronostratigraphy and provides a framework for future studies. This new age model, coupled with provisional delta (super 18) O analyses, provides greater confidence in the location of significant ocean-climate events at this site, including the Eocene-Oligocene transition and the Middle Eocene Climatic Optimum. Early Eocene hyperthermals may also be present near the base of the section. Palaeomagnetic age control is significantly improved in the Eocene, but not in the Oligocene. Revised estimates of sedimentation and biogenic flux indicate changes in supply and preservation that may be climatically controlled. A Lower to Middle Eocene hiatus is more precisely constrained, with a c. 4 million year duration. Age and depth errors quantify the age uncertainties throughout the section. Our revised age model will play an important role in stratigraphic correlation between very high latitude and lower latitude sites.completedStratigraphyalgaeAtlantic OceanbiostratigraphyCenozoicchronostratigraphycorrelationdiatomsDinoflagellataForaminiferaInvertebrataLabrador SeaLeg 105magnetostratigraphymicrofossilsnannofossilsNorth AtlanticOcean Drilling ProgramODP Site 647PaleogenepaleogeographypaleolatitudepaleomagnetismpalynomorphsPlantaeProtistaTertiaryurn:org.iodp:exp:105urnlargerWorkCitationcampaignurn:org.iodp:exp:105:site:647urnlargerWorkCitationstudyurn:org.iodp:exp:105urnlargerWorkCitationcampaignEnglishgeoscientificInformation-45.1542-45.154253.195453.1954