georefid:2001-079995georefid:2001-079986SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2001-079995<gco:CharacterString>Astronomical calibration of the Danian time scale</gco:CharacterString>2001-01-01publicationgeorefid:2001-079995Roehl, UrsulaBremen University, Geosciences Department, Bremen, Federal Republic of GermanyauthorOgg, James G.Woods Hole Oceanographic Institution, United StatesauthorGeib, Tricia L.Ocean Drilling Program, United StatesauthorWefer, GeroldPurdue University, United StatesauthorGeological Society of London, London, United KingdompublisherdocumentHardcopyIn: Kroon, Dick (editor), Norris, Richard D. (editor), Klaus, A. (editor), Western North Atlantic Palaeogene and Cretaceous palaeoceanography183163-183Ocean Drilling Program Sites 1001A (Caribbean Sea) and 1050C (western North Atlantic) display obliquity and precession cycles throughout polarity zone C27 of the late Danian stage (earliest Cenozoic time). Sliding-window spectra analysis and direct cycle counting on downhole logs and high-resolution Fe variations at both sites yield the equivalent of 35-36 obliquity cycles. This cycle-tuned duration for polarity chron C27 of 1.45 Ma (applying a modern mean obliquity period of 40.4 ka) is consistent with trends from astronomical tuning of early Danian polarity chron C29 and (super 40) Ar/ (super 39) Ar age calibration of the Campanian-Maastrichtian magnetic polarity time scale. The cycle-tuned Danian stage (sensu Berggren et al. 1995, in SEPM Special Publications, 54, 129-212) spans 3.65 Ma (65.5-61.85 Ma). Spreading rates on a reference South Atlantic synthetic profile display progressive slowing during the Maastrichtian to Danian stages, then remained relatively constant through late Palaeocene and early Eocene time.completedGeochronologyStratigraphyAtlantic OceancalibrationCenozoicDaniangeochronologyLeg 165Leg 171Blower PaleoceneNorth AtlanticNorthwest AtlanticOcean Drilling ProgramODP Site 1001ODP Site 1050paleo-oceanographyPaleocenepaleoclimatologyPaleogeneTertiarytime scalesurn:org.iodp:exp:165urnlargerWorkCitationcampaignurn:org.iodp:exp:171BurnlargerWorkCitationcampaignurn:org.iodp:exp:165:site:1001urnlargerWorkCitationstudyurn:org.iodp:exp:165urnlargerWorkCitationcampaignurn:org.iodp:exp:171B:site:1050urnlargerWorkCitationstudyurn:org.iodp:exp:171BurnlargerWorkCitationcampaignEnglishgeoscientificInformation-83.0000-65.000010.300030.0900