georefid:2000-002262SEDIS Publication Catalogue
ana.macario@awi.de
http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2000-002262<gco:CharacterString>Late Eocene microkrystites and microtektites at Maud Rise (Ocean Drilling Project Hole 689B; Southern Ocean) suggest a global extension of the approximately 35.5 Ma Pacific impact ejecta strewn field</gco:CharacterString>1999-01-01publicationgeorefid:2000-002262Vonhof, H. B.Free University of Amsterdam, Faculty of Earth Sciences, Amsterdam, NetherlandsauthorSmit, J.authorMeteoritical Society, Fayetteville, AR, United StatespublisherdocumentHardcopyMeteoritics & Planetary Science34 (5)747-755Late Eocene microtektites and microkrystites recovered from Ocean Drilling Project Hole 689B at Maud Rise (Southern Ocean) are stratigraphically and geochemically compared to spherules from the North American and Pacific strewn fields, and to devitrified spherules from the Eocene-Oligocene global stratotype section and point section in Massignano, Italy. The ODP 689B microkrystites compare well to the Pacific strewn field microkrystites, which suggests that the geographic extent of the Pacific strewn field was much larger than previously documented. The elemental composition of microtektites of ODP Hole 689B is comparable to tektites of the North American strewn field. Their (super 87) Sr/ (super 86) Sr ratio, however, is different. We tentatively interpret this to reflect geochemical heterogeneity within the North American strewn field but can not exclude the option that the chemical discrepancies result from the existence of a third late Eocene impact site.completedPetrology of meteorites and tektitesIsotope geochemistryalkaline earth metalsAntarctic OceanCenozoicchemical compositionejectaEoceneEuropeisotope ratiosisotopesItalyLeg 113magnetostratigraphyMassignano ItalyMaud Risemetalsmicrokrystitesmicroprobe datamicrotektitesmineral compositionOcean Drilling ProgramODP Site 689Pacific OceanPaleogeneSEM dataSouthern EuropeSouthern OceanspherulesSr-87/Sr-86stable isotopesstratotypesstrewn fieldsstrontiumtektitesTertiarytexturesupper EoceneWeddell Seaurn:org.iodp:exp:113urnlargerWorkCitationcampaignurn:org.iodp:exp:113:site:689urnlargerWorkCitationstudyurn:org.iodp:exp:113urnlargerWorkCitationcampaignEnglishgeoscientificInformation3.05593.0600-64.3101-64.3100