Osmium, tungsten, and chromium isotopes in sediments and in Ni‐rich spinel at the K‐T boundary: Signature of a chondritic impactor
Identifieur interne : 001444 ( Istex/Corpus ); précédent : 001443; suivant : 001445Osmium, tungsten, and chromium isotopes in sediments and in Ni‐rich spinel at the K‐T boundary: Signature of a chondritic impactor
Auteurs : Ghylaine Quitté ; Eric Robin ; Sylvain Levasseur ; Françoise Capmas ; Robert Rocchia ; Jean-Louis Birck ; Claude Jean AllègreSource :
- Meteoritics & Planetary Science [ 1086-9379 ] ; 2007-09.
Abstract
Abstract— It 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.
Url:
DOI: 10.1111/j.1945-5100.2007.tb00591.x
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ISTEX:86B0BF7F16E6854613785893821386712FC9D94BLe document en format XML
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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. 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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. 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revision accepted 29 March 2007</unparsedEditorialHistory><countGroup><count type="referenceTotal" number="96"></count><count type="linksCrossRef" number="10"></count></countGroup><titleGroup><title type="main">Osmium, tungsten, and chromium isotopes in sediments and in Ni‐rich spinel at the K‐T boundary: Signature of a chondritic impactor</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1 #a3" noteRef="#fn1" corresponding="yes"><personName><givenNames>Ghylaine</givenNames><familyName>QuittÉ</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>Eric</givenNames><familyName>Robin</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a3"><personName><givenNames>Sylvain</givenNames><familyName>Levasseur</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a1"><personName><givenNames>Françoise</givenNames><familyName>Capmas</familyName></personName></creator><creator creatorRole="author" xml:id="cr5" affiliationRef="#a2"><personName><givenNames>Robert</givenNames><familyName>Rocchia</familyName></personName></creator><creator creatorRole="author" xml:id="cr6" affiliationRef="#a1"><personName><givenNames>Jean‐Louis</givenNames><familyName>Birck</familyName></personName></creator><creator creatorRole="author" xml:id="cr7" affiliationRef="#a1"><personName><givenNames>Claude Jean</givenNames><familyName>AllÈGre</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="FR"><unparsedAffiliation>Laboratoire de Géochimie‐Cosmochimie, IPGP, 4 Place Jussieu, F‐75252 Paris Cedex 05, France</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="FR"><unparsedAffiliation>Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre et Simon Laplace, CEA/CNRS/UVSQ‐UMR 1572, Avenue de la Terrasse, F‐91198 Gif‐sur‐Yvette Cedex, France</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="CH"><unparsedAffiliation>Institut für Isotopengeologie und Mineralische Rohstoffe, ETH Zentrum, Clausiusstrasse 25, CH‐8092 Zürich, Switzerland</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><p><b>Abstract—</b> It 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.</p></abstract></abstractGroup></contentMeta><noteGroup><note xml:id="fn1"><label>†</label><p>Laboratoire des Sciences de la Terre, CNRS/ENS/UCBL, 46 allée d'Italie, F‐69364 Lyon Cedex 07, France</p></note></noteGroup></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Osmium, tungsten, and chromium isotopes in sediments and in Ni‐rich spinel at the K‐T boundary: Signature of a chondritic impactor</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Osmium, tungsten, and chromium isotopes in sediments and in Ni‐rich spinel at the K‐T boundary: Signature of a chondritic impactor</title></titleInfo><name type="personal"><namePart type="given">Ghylaine</namePart><namePart type="family">QuittÉ</namePart><affiliation>Laboratoire de Géochimie‐Cosmochimie, IPGP, 4 Place Jussieu, F‐75252 Paris Cedex 05, France</affiliation><affiliation>Institut für Isotopengeologie und Mineralische Rohstoffe, ETH Zentrum, Clausiusstrasse 25, CH‐8092 Zürich, Switzerland</affiliation><description>Laboratoire des Sciences de la Terre, CNRS/ENS/UCBL, 46 allée d'Italie, F‐69364 Lyon Cedex 07, France</description><affiliation>E-mail: ghylaine.quitte@ens‐lyon.fr</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Eric</namePart><namePart type="family">Robin</namePart><affiliation>Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre et Simon Laplace, CEA/CNRS/UVSQ‐UMR 1572, Avenue de la Terrasse, F‐91198 Gif‐sur‐Yvette Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Sylvain</namePart><namePart type="family">Levasseur</namePart><affiliation>Institut für Isotopengeologie und Mineralische Rohstoffe, ETH Zentrum, Clausiusstrasse 25, CH‐8092 Zürich, Switzerland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Françoise</namePart><namePart type="family">Capmas</namePart><affiliation>Laboratoire de Géochimie‐Cosmochimie, IPGP, 4 Place Jussieu, F‐75252 Paris Cedex 05, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Robert</namePart><namePart type="family">Rocchia</namePart><affiliation>Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre et Simon Laplace, CEA/CNRS/UVSQ‐UMR 1572, Avenue de la Terrasse, F‐91198 Gif‐sur‐Yvette Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jean‐Louis</namePart><namePart type="family">Birck</namePart><affiliation>Laboratoire de Géochimie‐Cosmochimie, IPGP, 4 Place Jussieu, F‐75252 Paris Cedex 05, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Claude Jean</namePart><namePart type="family">AllÈGre</namePart><affiliation>Laboratoire de Géochimie‐Cosmochimie, IPGP, 4 Place Jussieu, F‐75252 Paris Cedex 05, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2007-09</dateIssued><edition>Received 23 January 2006; revision accepted 29 March 2007</edition><copyrightDate encoding="w3cdtf">2007</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="references">96</extent></physicalDescription><abstract>Abstract— It 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.</abstract><relatedItem type="host"><titleInfo><title>Meteoritics & Planetary Science</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">1086-9379</identifier><identifier type="eISSN">1945-5100</identifier><identifier type="DOI">10.1111/(ISSN)1945-5100</identifier><identifier type="PublisherID">MAPS</identifier><part><date>2007</date><detail type="volume"><caption>vol.</caption><number>42</number></detail><detail type="issue"><caption>no.</caption><number>9</number></detail><extent unit="pages"><start>1567</start><end>1580</end><total>14</total></extent></part></relatedItem><identifier type="istex">86B0BF7F16E6854613785893821386712FC9D94B</identifier><identifier type="DOI">10.1111/j.1945-5100.2007.tb00591.x</identifier><identifier type="ArticleID">MAPS591</identifier><accessCondition type="use and reproduction" contentType="copyright">2007 The Meteoritical Society</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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