Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites
Identifieur interne : 001A06 ( Istex/Corpus ); précédent : 001A05; suivant : 001A07Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites
Auteurs : Jean-Pierre Lorand ; Jean-Alix Barrat ; Vincent Chevrier ; Violaine Sautter ; Sylvain PontSource :
- Meteoritics & Planetary Science [ 1086-9379 ] ; 2012-11.
Abstract
NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal‐saturated Fe‐Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.
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DOI: 10.1111/maps.12015
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ISTEX:ED600750FCC7F42ABBBF680C57301D93FD6A169DLe document en format XML
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Keck Laboratory for Space and Planetary Simulation, Arkansas Center for Space and Planetary Science, MUSE 202, University of Arkansas, Fayetteville, Arkansas 72701, USA</mods:affiliation></affiliation></author><author><name sortKey="Sautter, Violaine" sort="Sautter, Violaine" uniqKey="Sautter V" first="Violaine" last="Sautter">Violaine Sautter</name><affiliation><mods:affiliation>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</mods:affiliation></affiliation></author><author><name sortKey="Pont, Sylvain" sort="Pont, Sylvain" uniqKey="Pont S" first="Sylvain" last="Pont">Sylvain Pont</name><affiliation><mods:affiliation>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Meteoritics & Planetary Science</title><idno type="ISSN">1086-9379</idno><idno type="eISSN">1945-5100</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2012-11">2012-11</date><biblScope unit="volume">47</biblScope><biblScope unit="issue">11</biblScope><biblScope unit="page" from="1830">1830</biblScope><biblScope unit="page" to="1841">1841</biblScope></imprint><idno type="ISSN">1086-9379</idno></series><idno type="istex">ED600750FCC7F42ABBBF680C57301D93FD6A169D</idno><idno type="DOI">10.1111/maps.12015</idno><idno type="ArticleID">MAPS12015</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1086-9379</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal‐saturated Fe‐Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Jean‐Pierre LORAND</name><affiliations><json:string>Laboratoire de Planétologie et Géodynamique de Nantes, Université de Nantes and Centre National de la Recherche Scientifique (UMR 6112), 2 Rue La Houssinière, BP 92208, 44322 Nantes, Cédex 3, France</json:string></affiliations></json:item><json:item><name>Jean‐Alix BARRAT</name><affiliations><json:string>Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané Cedex, France</json:string></affiliations></json:item><json:item><name>Vincent CHEVRIER</name><affiliations><json:string>W.M. Keck Laboratory for Space and Planetary Simulation, Arkansas Center for Space and Planetary Science, MUSE 202, University of Arkansas, Fayetteville, Arkansas 72701, USA</json:string></affiliations></json:item><json:item><name>Violaine SAUTTER</name><affiliations><json:string>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</json:string></affiliations></json:item><json:item><name>Sylvain PONT</name><affiliations><json:string>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</json:string></affiliations></json:item></author><articleId><json:string>MAPS12015</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal‐saturated Fe‐Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.</abstract><qualityIndicators><score>7.484</score><pdfVersion>1.3</pdfVersion><pdfPageSize>595.276 x 790.866 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>1533</abstractCharCount><pdfWordCount>6901</pdfWordCount><pdfCharCount>45604</pdfCharCount><pdfPageCount>12</pdfPageCount><abstractWordCount>207</abstractWordCount></qualityIndicators><title>Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites</title><genre><json:string>article</json:string></genre><host><volume>47</volume><publisherId><json:string>MAPS</json:string></publisherId><pages><total>12</total><last>1841</last><first>1830</first></pages><issn><json:string>1086-9379</json:string></issn><issue>11</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1945-5100</json:string></eissn><title>Meteoritics & Planetary Science</title><doi><json:string>10.1111/(ISSN)1945-5100</json:string></doi></host><publicationDate>2012</publicationDate><copyrightDate>2012</copyrightDate><doi><json:string>10.1111/maps.12015</json:string></doi><id>ED600750FCC7F42ABBBF680C57301D93FD6A169D</id><score>0.02900446</score><fulltext><json:item><original>true</original><mimetype>application/pdf</mimetype><extension>pdf</extension><uri>https://api.istex.fr/document/ED600750FCC7F42ABBBF680C57301D93FD6A169D/fulltext/pdf</uri></json:item><json:item><original>false</original><mimetype>application/zip</mimetype><extension>zip</extension><uri>https://api.istex.fr/document/ED600750FCC7F42ABBBF680C57301D93FD6A169D/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/ED600750FCC7F42ABBBF680C57301D93FD6A169D/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><availability><p>© The Meteoritical Society, 2012</p></availability><date>2012</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites</title><author xml:id="author-1"><persName><forename type="first">Jean‐Pierre</forename><surname>LORAND</surname></persName><note type="correspondence"><p>Correspondence: Corresponding author. E‐mail:</p></note><affiliation>Laboratoire de Planétologie et Géodynamique de Nantes, Université de Nantes and Centre National de la Recherche Scientifique (UMR 6112), 2 Rue La Houssinière, BP 92208, 44322 Nantes, Cédex 3, France</affiliation></author><author xml:id="author-2"><persName><forename type="first">Jean‐Alix</forename><surname>BARRAT</surname></persName><affiliation>Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané Cedex, France</affiliation></author><author xml:id="author-3"><persName><forename type="first">Vincent</forename><surname>CHEVRIER</surname></persName><affiliation>W.M. Keck Laboratory for Space and Planetary Simulation, Arkansas Center for Space and Planetary Science, MUSE 202, University of Arkansas, Fayetteville, Arkansas 72701, USA</affiliation></author><author xml:id="author-4"><persName><forename type="first">Violaine</forename><surname>SAUTTER</surname></persName><affiliation>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</affiliation></author><author xml:id="author-5"><persName><forename type="first">Sylvain</forename><surname>PONT</surname></persName><affiliation>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</affiliation></author></analytic><monogr><title level="j">Meteoritics & Planetary Science</title><idno type="pISSN">1086-9379</idno><idno type="eISSN">1945-5100</idno><idno type="DOI">10.1111/(ISSN)1945-5100</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2012-11"></date><biblScope unit="volume">47</biblScope><biblScope unit="issue">11</biblScope><biblScope unit="page" from="1830">1830</biblScope><biblScope unit="page" to="1841">1841</biblScope></imprint></monogr><idno type="istex">ED600750FCC7F42ABBBF680C57301D93FD6A169D</idno><idno type="DOI">10.1111/maps.12015</idno><idno type="ArticleID">MAPS12015</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2012</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal‐saturated Fe‐Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.</p></abstract></profileDesc><revisionDesc><change when="2012-11">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/ED600750FCC7F42ABBBF680C57301D93FD6A169D/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1945-5100</doi><issn type="print">1086-9379</issn><issn type="electronic">1945-5100</issn><idGroup><id type="product" value="MAPS"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="METEORITICS AND PLANETARY SCIENCE">Meteoritics & Planetary Science</title></titleGroup></publicationMeta><publicationMeta level="part" position="11111"><doi origin="wiley">10.1111/maps.2012.47.issue-11</doi><numberingGroup><numbering type="journalVolume" number="47">47</numbering><numbering type="journalIssue" number="11">11</numbering></numberingGroup><coverDate startDate="2012-11">November 2012</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="10" status="forIssue"><doi origin="wiley">10.1111/maps.12015</doi><idGroup><id type="unit" value="MAPS12015"></id></idGroup><countGroup><count type="pageTotal" number="12"></count></countGroup><titleGroup><title type="tocHeading1">Articles</title></titleGroup><copyright>© The Meteoritical Society, 2012</copyright><eventGroup><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:3.1.9 mode:FullText" date="2012-12-20"></event><event agent="SPS" date="2012-12-20" type="xmlCorrected"></event><event type="publishedOnlineEarlyUnpaginated" date="2012-11-26"></event><event type="firstOnline" date="2012-11-26"></event><event type="publishedOnlineFinalForm" date="2012-12-21"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:4.0.1" date="2014-03-20"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.3.4 mode:FullText" date="2015-02-25"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="1830">1830</numbering><numbering type="pageLast" number="1841">1841</numbering></numberingGroup><correspondenceTo> Corresponding author. E‐mail: <email normalForm="jean-pierre.lorand@univ-nantes.fr">jean-pierre.lorand@univ-nantes.fr</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:MAPS.MAPS12015.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>(Received 05 June 2012; revision accepted 01 October 2012)</unparsedEditorialHistory><countGroup><count type="figureTotal" number="5"></count><count type="tableTotal" number="2"></count></countGroup><titleGroup><title type="main">Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites</title><title type="shortAuthors">J.‐P. Lorand et al.</title><title type="short">Metal‐saturated sulfide assemblages in NWA 2737</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1" corresponding="yes"><personName><givenNames>Jean‐Pierre</givenNames><familyName>LORAND</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>Jean‐Alix</givenNames><familyName>BARRAT</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a3"><personName><givenNames>Vincent</givenNames><familyName>CHEVRIER</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a4"><personName><givenNames>Violaine</givenNames><familyName>SAUTTER</familyName></personName></creator><creator creatorRole="author" xml:id="cr5" affiliationRef="#a4"><personName><givenNames>Sylvain</givenNames><familyName>PONT</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="FR"><unparsedAffiliation>Laboratoire de Planétologie et Géodynamique de Nantes, Université de Nantes and Centre National de la Recherche Scientifique (UMR 6112), 2 Rue La Houssinière, BP 92208, 44322 Nantes, Cédex 3, France</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="FR"><unparsedAffiliation>Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané Cedex, France</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="US"><unparsedAffiliation>W.M. Keck Laboratory for Space and Planetary Simulation, Arkansas Center for Space and Planetary Science, MUSE 202, University of Arkansas, Fayetteville, Arkansas 72701, USA</unparsedAffiliation></affiliation><affiliation xml:id="a4" countryCode="FR"><unparsedAffiliation>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract–</title><p>NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal‐saturated Fe‐Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the <i>f</i>O<sub>2</sub> conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Metal‐saturated sulfide assemblages in NWA 2737</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Metal‐saturated sulfide assemblages in NWA 2737: Evidence for impact‐related sulfur devolatilization in Martian meteorites</title></titleInfo><name type="personal"><namePart type="given">Jean‐Pierre</namePart><namePart type="family">LORAND</namePart><affiliation>Laboratoire de Planétologie et Géodynamique de Nantes, Université de Nantes and Centre National de la Recherche Scientifique (UMR 6112), 2 Rue La Houssinière, BP 92208, 44322 Nantes, Cédex 3, France</affiliation><description>Correspondence: Corresponding author. E‐mail: </description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jean‐Alix</namePart><namePart type="family">BARRAT</namePart><affiliation>Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané Cedex, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Vincent</namePart><namePart type="family">CHEVRIER</namePart><affiliation>W.M. Keck Laboratory for Space and Planetary Simulation, Arkansas Center for Space and Planetary Science, MUSE 202, University of Arkansas, Fayetteville, Arkansas 72701, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Violaine</namePart><namePart type="family">SAUTTER</namePart><affiliation>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Sylvain</namePart><namePart type="family">PONT</namePart><affiliation>Muséum National d’Histoire Naturelle, Laboratoire de Minéralogie et Cosmochimie, CNRS UMR 7202, 61 Rue Buffon, 75005, Paris, 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">2012-11</dateIssued><edition>(Received 05 June 2012; revision accepted 01 October 2012)</edition><copyrightDate encoding="w3cdtf">2012</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="figures">5</extent><extent unit="tables">2</extent></physicalDescription><abstract lang="en">NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal‐saturated Fe‐Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni‐poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr‐bearing (up to 1 wt%), coexists with micrometer‐sized taenite/tetrataenite‐type native Ni‐Fe alloys (Ni/Fe = 1) and Fe‐Os‐Ir‐(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame‐like pentlandite (Fe/Fe + Ni = 0.5–0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni‐Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal‐deficient monoclinic‐type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions inferred from chromites compositions and accepted for Chassignites (FMQ‐1 log unit). It is proposed that reduction in sulfides into base and precious metal alloys is operated via sulfur degassing, which is supported by the highly resorbed and denticulated shape of sulfide blebs and their spongy textures. Shock‐related S degassing may be responsible for considerable damages in magmatic sulfide structures and sulfide assemblages, with concomitant loss of magnetic properties as documented in some other Martian meteorites.</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>2012</date><detail type="volume"><caption>vol.</caption><number>47</number></detail><detail type="issue"><caption>no.</caption><number>11</number></detail><extent unit="pages"><start>1830</start><end>1841</end><total>12</total></extent></part></relatedItem><identifier type="istex">ED600750FCC7F42ABBBF680C57301D93FD6A169D</identifier><identifier type="DOI">10.1111/maps.12015</identifier><identifier type="ArticleID">MAPS12015</identifier><accessCondition type="use and reproduction" contentType="copyright">© The Meteoritical Society, 2012</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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