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dc.contributor.authorQuitté, G.
dc.contributor.authorRobin, E.
dc.contributor.authorLevasseur, S.
dc.contributor.authorCapmas, F.
dc.contributor.authorRocchia, R.
dc.contributor.authorBirck, J.-L.
dc.contributor.authorAllègre, C. J.
dc.date.accessioned2021-02-12T22:30:16Z
dc.date.available2021-02-12T22:30:16Z
dc.date.issued2007-01-01
dc.identifier.citationQuitté, G., Robin, E., Levasseur, S., Capmas, F., Rocchia, R., Birck, J.-L., & Allègre, C. J. (2007). Osmium, tungsten, and chromium isotopes in sediments and in Ni‐rich spinel at the K‐T boundary: Signature of a chondritic impactor. Meteoritics & Planetary Science, 42(9), 1567-1580.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2007.tb00591.x
dc.identifier.urihttp://hdl.handle.net/10150/656328
dc.description.abstractIt is now established that a large extraterrestrial object hit the Earth at the end of the Cretaceous period, about 65 Ma ago. We have investigated Re-Os, Hf-W, and Mn-Cr isotope systems in sediments from the Cretaceous and the Paleogene in order to characterize the type of impactor. Within the Cretaceous-Tertiary (K-T) boundary layer, extraterrestrial material is mixed with terrestrial material, causing a dilution of the extraterrestrial isotope signature that is difficult to quantify. A phase essentially composed of Ni-rich spinel, formed in the atmosphere mainly from melted projectile material, is likely to contain the extraterrestrial isotopic signature of the impactor. We show that the analysis of spinel is indeed the best approach to determine the initial isotope composition of the impactor, and that W and Cr isotopes confirm that the projectile was a carbonaceous chondrite.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectcarbonaceous chondrite meteorites
dc.subjectK/T boundary
dc.subjectspinels
dc.subjectisotopes
dc.titleOsmium, tungsten, and chromium isotopes in sediments and in Ni-rich spinel at the K-T boundary: Signature of a chondritic impactor
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume42
dc.source.issue9
dc.source.beginpage1567
dc.source.endpage1580
refterms.dateFOA2021-02-12T22:30:16Z


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