Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)
Identifieur interne : 000294 ( Istex/Corpus ); précédent : 000293; suivant : 000295Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)
Auteurs : M. Leblanc ; W. FischerSource :
- Mineralogy and Petrology [ 0930-0708 ] ; 1990-05-01.
Abstract
Summary: The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains < 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites. In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment. Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.
Url:
DOI: 10.1007/BF01162691
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</title><author><name sortKey="Leblanc, M" sort="Leblanc, M" uniqKey="Leblanc M" first="M." last="Leblanc">M. Leblanc</name><affiliation><mods:affiliation>Centre Géologique et Géophysique, C.N.R.S, Université Montpellier II, F-34095, Montpellier Cedex2, France</mods:affiliation></affiliation></author><author><name sortKey="Fischer, W" sort="Fischer, W" uniqKey="Fischer W" first="W." last="Fischer">W. Fischer</name><affiliation><mods:affiliation>UA 69, Institut Dolomieu, F-38031, Grenoble, France</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:59864FA774B591DBCD9FC3C017A4BB438FCA3FDE</idno><date when="1990" year="1990">1990</date><idno type="doi">10.1007/BF01162691</idno><idno type="url">https://api.istex.fr/document/59864FA774B591DBCD9FC3C017A4BB438FCA3FDE/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000294</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000294</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</title><author><name sortKey="Leblanc, M" sort="Leblanc, M" uniqKey="Leblanc M" first="M." last="Leblanc">M. Leblanc</name><affiliation><mods:affiliation>Centre Géologique et Géophysique, C.N.R.S, Université Montpellier II, F-34095, Montpellier Cedex2, France</mods:affiliation></affiliation></author><author><name sortKey="Fischer, W" sort="Fischer, W" uniqKey="Fischer W" first="W." last="Fischer">W. Fischer</name><affiliation><mods:affiliation>UA 69, Institut Dolomieu, F-38031, Grenoble, France</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Mineralogy and Petrology</title><title level="j" type="abbrev">Mineralogy and Petrology</title><idno type="ISSN">0930-0708</idno><idno type="eISSN">1438-1168</idno><imprint><publisher>Springer-Verlag</publisher><pubPlace>Vienna</pubPlace><date type="published" when="1990-05-01">1990-05-01</date><biblScope unit="volume">42</biblScope><biblScope unit="issue">1-4</biblScope><biblScope unit="page" from="197">197</biblScope><biblScope unit="page" to="209">209</biblScope></imprint><idno type="ISSN">0930-0708</idno></series><idno type="istex">59864FA774B591DBCD9FC3C017A4BB438FCA3FDE</idno><idno type="DOI">10.1007/BF01162691</idno><idno type="ArticleID">BF01162691</idno><idno type="ArticleID">Art12</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0930-0708</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Summary: The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains < 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites. In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment. Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.</div></front></TEI><istex><corpusName>springer</corpusName><author><json:item><name>M. Leblanc</name><affiliations><json:string>Centre Géologique et Géophysique, C.N.R.S, Université Montpellier II, F-34095, Montpellier Cedex2, France</json:string></affiliations></json:item><json:item><name>W. Fischer</name><affiliations><json:string>UA 69, Institut Dolomieu, F-38031, Grenoble, France</json:string></affiliations></json:item></author><articleId><json:string>BF01162691</json:string><json:string>Art12</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>OriginalPaper</json:string></originalGenre><abstract>Summary: The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains > 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites. In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment. Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.</abstract><qualityIndicators><score>6.722</score><pdfVersion>1.3</pdfVersion><pdfPageSize>594 x 792 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>1385</abstractCharCount><pdfWordCount>4262</pdfWordCount><pdfCharCount>27282</pdfCharCount><pdfPageCount>13</pdfPageCount><abstractWordCount>205</abstractWordCount></qualityIndicators><title>Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</title><genre><json:string>research-article</json:string></genre><host><volume>42</volume><pages><last>209</last><first>197</first></pages><issn><json:string>0930-0708</json:string></issn><issue>1-4</issue><subject><json:item><value>Geochemistry</value></json:item><json:item><value>Mineralogy</value></json:item></subject><journalId><json:string>710</json:string></journalId><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1438-1168</json:string></eissn><title>Mineralogy and Petrology</title><publicationDate>1990</publicationDate><copyrightDate>1990</copyrightDate></host><publicationDate>1990</publicationDate><copyrightDate>1990</copyrightDate><doi><json:string>10.1007/BF01162691</json:string></doi><id>59864FA774B591DBCD9FC3C017A4BB438FCA3FDE</id><score>0.18723464</score><fulltext><json:item><original>true</original><mimetype>application/pdf</mimetype><extension>pdf</extension><uri>https://api.istex.fr/document/59864FA774B591DBCD9FC3C017A4BB438FCA3FDE/fulltext/pdf</uri></json:item><json:item><original>false</original><mimetype>application/zip</mimetype><extension>zip</extension><uri>https://api.istex.fr/document/59864FA774B591DBCD9FC3C017A4BB438FCA3FDE/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/59864FA774B591DBCD9FC3C017A4BB438FCA3FDE/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</title><title level="a" type="alt" xml:lang="de">Gold und Platingruppen-Elemente in Kobalt-Arsenid Erzen: Hydrothermale Anreicherung aus einem Serpentinit (Bou Azzer, Marokko)</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Springer-Verlag</publisher><pubPlace>Vienna</pubPlace><availability><p>Springer-Verlag 1990, 1990</p></availability><date>1989-08-03</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</title><title level="a" type="alt" xml:lang="de">Gold und Platingruppen-Elemente in Kobalt-Arsenid Erzen: Hydrothermale Anreicherung aus einem Serpentinit (Bou Azzer, Marokko)</title><author xml:id="author-1"><persName><forename type="first">M.</forename><surname>Leblanc</surname></persName><affiliation>Centre Géologique et Géophysique, C.N.R.S, Université Montpellier II, F-34095, Montpellier Cedex2, France</affiliation></author><author xml:id="author-2"><persName><forename type="first">W.</forename><surname>Fischer</surname></persName><affiliation>UA 69, Institut Dolomieu, F-38031, Grenoble, France</affiliation></author></analytic><monogr><title level="j">Mineralogy and Petrology</title><title level="j" type="abbrev">Mineralogy and Petrology</title><idno type="journal-ID">710</idno><idno type="pISSN">0930-0708</idno><idno type="eISSN">1438-1168</idno><idno type="issue-article-count">19</idno><idno type="volume-issue-count">4</idno><imprint><publisher>Springer-Verlag</publisher><pubPlace>Vienna</pubPlace><date type="published" when="1990-05-01"></date><biblScope unit="volume">42</biblScope><biblScope unit="issue">1-4</biblScope><biblScope unit="page" from="197">197</biblScope><biblScope unit="page" to="209">209</biblScope></imprint></monogr><idno type="istex">59864FA774B591DBCD9FC3C017A4BB438FCA3FDE</idno><idno type="DOI">10.1007/BF01162691</idno><idno type="ArticleID">BF01162691</idno><idno type="ArticleID">Art12</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1989-08-03</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Summary: The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains < 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites. In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment. Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.</p></abstract><abstract xml:lang="de"><p>Zusammenfassung: Die Kobalt-Arsenid Erze von Bou Azzer kommen entlang den Grenzen eines Serpentinit-Massifs (Oberproterozoischer Ophiolit-Komplex) in Karbonat-Quarz-Linsen vor, die auf hydrothermale Umwandlung des Serpentinits zurückgehen. Die Kobalt-Erze enthalten 5–20 ppm Gold; dieses kommt hauptsächlich in Skutterudit (120 ppm) vor, während die Fe-Arsenide (Loellingit) weniger als 1 ppm Gold enthalten. Die höchsten PGE Gehalte kommen ebenso in Skutterudit vor (bis zu 2 ppm PGE). Alle Arsenid-Erze zeigen das gleiche Verteilungsbild mit positiven Rh und negativen Pt Anomalien, und eine leicht positive Neigung (Pd/Ir = 1 bis 2). Diese ungewöhnlichen PGE Verteilungsbilder erinnern an die von Sulfiden aus Komatiiten. Die PGE Verteilung in Serpentiniten ist typisch für leicht verarmte Mantelgesteine, und die assoziierten podiformen Chromitite liegen innerhalb des Bereiches für ophiolitische Chromitite, mit Ausnahme der Anreicherung in Pd und Au. Lagen von Sulfid-führenden Serpentiniten zeigen relativ hohe Gehalte an Edelmetallen, und PGE-Verteilungsmuster die denen von Co-Arseniderzen sehr ähnlich sind, obwohl sie um eine Größenordnung niedriger liegen. Diese Sulfide dürften Produkte der Remobilisierung primärer magmatischer Sulfide während der Serpentinisierung sein. Die Sulfid-reichen Lagen sind als ein mögliches Ursprungsgestein für die Edelmetalle der Kobalt-Arsenid-Erze von Bou Azzer zu sehen.</p></abstract><textClass><keywords scheme="Journal Subject"><list><head>Geosciences</head><item><term>Geochemistry</term></item><item><term>Mineralogy</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1989-08-03">Created</change><change when="1990-05-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-09-22">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/59864FA774B591DBCD9FC3C017A4BB438FCA3FDE/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Springer, Publisher found" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="UTF-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//Springer-Verlag//DTD A++ V2.4//EN" URI="http://devel.springer.de/A++/V2.4/DTD/A++V2.4.dtd" name="istex:docType"></istex:docType><istex:document><Publisher><PublisherInfo><PublisherName>Springer-Verlag</PublisherName><PublisherLocation>Vienna</PublisherLocation></PublisherInfo><Journal><JournalInfo JournalProductType="ArchiveJournal" NumberingStyle="Unnumbered"><JournalID>710</JournalID><JournalPrintISSN>0930-0708</JournalPrintISSN><JournalElectronicISSN>1438-1168</JournalElectronicISSN><JournalTitle>Mineralogy and Petrology</JournalTitle><JournalAbbreviatedTitle>Mineralogy and Petrology</JournalAbbreviatedTitle><JournalSubjectGroup><JournalSubject Type="Primary">Geosciences</JournalSubject><JournalSubject Type="Secondary">Geochemistry</JournalSubject><JournalSubject Type="Secondary">Mineralogy</JournalSubject></JournalSubjectGroup></JournalInfo><Volume><VolumeInfo VolumeType="Regular" TocLevels="0"><VolumeIDStart>42</VolumeIDStart><VolumeIDEnd>42</VolumeIDEnd><VolumeIssueCount>4</VolumeIssueCount></VolumeInfo><Issue IssueType="Combined"><IssueInfo TocLevels="0"><IssueIDStart>1</IssueIDStart><IssueIDEnd>4</IssueIDEnd><IssueArticleCount>19</IssueArticleCount><IssueHistory><CoverDate><Year>1990</Year><Month>5</Month></CoverDate></IssueHistory><IssueCopyright><CopyrightHolderName>Springer-Verlag</CopyrightHolderName><CopyrightYear>1990</CopyrightYear></IssueCopyright></IssueInfo><Article ID="Art12"><ArticleInfo Language="En" ArticleType="OriginalPaper" NumberingStyle="Unnumbered" TocLevels="0" ContainsESM="No"><ArticleID>BF01162691</ArticleID><ArticleDOI>10.1007/BF01162691</ArticleDOI><ArticleSequenceNumber>12</ArticleSequenceNumber><ArticleTitle Language="En">Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</ArticleTitle><ArticleTitle Language="De">Gold und Platingruppen-Elemente in Kobalt-Arsenid Erzen: Hydrothermale Anreicherung aus einem Serpentinit (Bou Azzer, Marokko)</ArticleTitle><ArticleFirstPage>197</ArticleFirstPage><ArticleLastPage>209</ArticleLastPage><ArticleHistory><RegistrationDate><Year>2005</Year><Month>1</Month><Day>30</Day></RegistrationDate><Received><Year>1989</Year><Month>8</Month><Day>3</Day></Received><Accepted><Year>1989</Year><Month>10</Month><Day>31</Day></Accepted></ArticleHistory><ArticleCopyright><CopyrightHolderName>Springer-Verlag 1990</CopyrightHolderName><CopyrightYear>1990</CopyrightYear></ArticleCopyright><ArticleGrants Type="Regular"><MetadataGrant Grant="OpenAccess"></MetadataGrant><AbstractGrant Grant="OpenAccess"></AbstractGrant><BodyPDFGrant Grant="Restricted"></BodyPDFGrant><BodyHTMLGrant Grant="Restricted"></BodyHTMLGrant><BibliographyGrant Grant="Restricted"></BibliographyGrant><ESMGrant Grant="Restricted"></ESMGrant></ArticleGrants><ArticleContext><JournalID>710</JournalID><VolumeIDStart>42</VolumeIDStart><VolumeIDEnd>42</VolumeIDEnd><IssueIDStart>1</IssueIDStart><IssueIDEnd>4</IssueIDEnd></ArticleContext></ArticleInfo><ArticleHeader><AuthorGroup><Author AffiliationIDS="Aff1"><AuthorName DisplayOrder="Western"><GivenName>M.</GivenName><FamilyName>Leblanc</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>W.</GivenName><FamilyName>Fischer</FamilyName></AuthorName></Author><Affiliation ID="Aff1"><OrgDivision>Centre Géologique et Géophysique, C.N.R.S</OrgDivision><OrgName>Université Montpellier II</OrgName><OrgAddress><Postcode>F-34095</Postcode><City>Montpellier Cedex2</City><Country>France</Country></OrgAddress></Affiliation><Affiliation ID="Aff2"><OrgDivision>UA 69</OrgDivision><OrgName>Institut Dolomieu</OrgName><OrgAddress><Postcode>F-38031</Postcode><City>Grenoble</City><Country>France</Country></OrgAddress></Affiliation></AuthorGroup><Abstract ID="Abs1" Language="En"><Heading>Summary</Heading><Para>The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains < 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites.</Para><Para>In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment.</Para><Para>Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.</Para></Abstract><Abstract ID="Abs2" Language="De"><Heading>Zusammenfassung</Heading><Para>Die Kobalt-Arsenid Erze von Bou Azzer kommen entlang den Grenzen eines Serpentinit-Massifs (Oberproterozoischer Ophiolit-Komplex) in Karbonat-Quarz-Linsen vor, die auf hydrothermale Umwandlung des Serpentinits zurückgehen.</Para><Para>Die Kobalt-Erze enthalten 5–20 ppm Gold; dieses kommt hauptsächlich in Skutterudit (120 ppm) vor, während die Fe-Arsenide (Loellingit) weniger als 1 ppm Gold enthalten. Die höchsten PGE Gehalte kommen ebenso in Skutterudit vor (bis zu 2 ppm PGE). Alle Arsenid-Erze zeigen das gleiche Verteilungsbild mit positiven Rh und negativen Pt Anomalien, und eine leicht positive Neigung (Pd/Ir = 1 bis 2). Diese ungewöhnlichen PGE Verteilungsbilder erinnern an die von Sulfiden aus Komatiiten.</Para><Para>Die PGE Verteilung in Serpentiniten ist typisch für leicht verarmte Mantelgesteine, und die assoziierten podiformen Chromitite liegen innerhalb des Bereiches für ophiolitische Chromitite, mit Ausnahme der Anreicherung in Pd und Au.</Para><Para>Lagen von Sulfid-führenden Serpentiniten zeigen relativ hohe Gehalte an Edelmetallen, und PGE-Verteilungsmuster die denen von Co-Arseniderzen sehr ähnlich sind, obwohl sie um eine Größenordnung niedriger liegen. Diese Sulfide dürften Produkte der Remobilisierung primärer magmatischer Sulfide während der Serpentinisierung sein. Die Sulfid-reichen Lagen sind als ein mögliches Ursprungsgestein für die Edelmetalle der Kobalt-Arsenid-Erze von Bou Azzer zu sehen.</Para></Abstract><ArticleNote Type="Misc"><SimplePara>With 8 Figures</SimplePara></ArticleNote></ArticleHeader><NoBody></NoBody></Article></Issue></Volume></Journal></Publisher></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)</title></titleInfo><titleInfo lang="de"><title>Gold und Platingruppen-Elemente in Kobalt-Arsenid Erzen: Hydrothermale Anreicherung aus einem Serpentinit (Bou Azzer, Marokko)</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="de"><title>Gold und Platingruppen-Elemente in Kobalt-Arsenid Erzen: Hydrothermale Anreicherung aus einem Serpentinit (Bou Azzer, Marokko)</title></titleInfo><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Leblanc</namePart><affiliation>Centre Géologique et Géophysique, C.N.R.S, Université Montpellier II, F-34095, Montpellier Cedex2, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">W.</namePart><namePart type="family">Fischer</namePart><affiliation>UA 69, Institut Dolomieu, F-38031, Grenoble, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="OriginalPaper"></genre><originInfo><publisher>Springer-Verlag</publisher><place><placeTerm type="text">Vienna</placeTerm></place><dateCreated encoding="w3cdtf">1989-08-03</dateCreated><dateIssued encoding="w3cdtf">1990-05-01</dateIssued><copyrightDate encoding="w3cdtf">1990</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Summary: The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains < 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites. In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment. Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.</abstract><abstract lang="de">Zusammenfassung: Die Kobalt-Arsenid Erze von Bou Azzer kommen entlang den Grenzen eines Serpentinit-Massifs (Oberproterozoischer Ophiolit-Komplex) in Karbonat-Quarz-Linsen vor, die auf hydrothermale Umwandlung des Serpentinits zurückgehen. Die Kobalt-Erze enthalten 5–20 ppm Gold; dieses kommt hauptsächlich in Skutterudit (120 ppm) vor, während die Fe-Arsenide (Loellingit) weniger als 1 ppm Gold enthalten. Die höchsten PGE Gehalte kommen ebenso in Skutterudit vor (bis zu 2 ppm PGE). Alle Arsenid-Erze zeigen das gleiche Verteilungsbild mit positiven Rh und negativen Pt Anomalien, und eine leicht positive Neigung (Pd/Ir = 1 bis 2). Diese ungewöhnlichen PGE Verteilungsbilder erinnern an die von Sulfiden aus Komatiiten. Die PGE Verteilung in Serpentiniten ist typisch für leicht verarmte Mantelgesteine, und die assoziierten podiformen Chromitite liegen innerhalb des Bereiches für ophiolitische Chromitite, mit Ausnahme der Anreicherung in Pd und Au. Lagen von Sulfid-führenden Serpentiniten zeigen relativ hohe Gehalte an Edelmetallen, und PGE-Verteilungsmuster die denen von Co-Arseniderzen sehr ähnlich sind, obwohl sie um eine Größenordnung niedriger liegen. Diese Sulfide dürften Produkte der Remobilisierung primärer magmatischer Sulfide während der Serpentinisierung sein. Die Sulfid-reichen Lagen sind als ein mögliches Ursprungsgestein für die Edelmetalle der Kobalt-Arsenid-Erze von Bou Azzer zu sehen.</abstract><relatedItem type="host"><titleInfo><title>Mineralogy and Petrology</title></titleInfo><titleInfo type="abbreviated"><title>Mineralogy and Petrology</title></titleInfo><genre type="journal" displayLabel="Archive Journal"></genre><originInfo><dateIssued encoding="w3cdtf">1990-05-01</dateIssued><copyrightDate encoding="w3cdtf">1990</copyrightDate></originInfo><subject><genre>Geosciences</genre><topic>Geochemistry</topic><topic>Mineralogy</topic></subject><identifier type="ISSN">0930-0708</identifier><identifier type="eISSN">1438-1168</identifier><identifier type="JournalID">710</identifier><identifier type="IssueArticleCount">19</identifier><identifier type="VolumeIssueCount">4</identifier><part><date>1990</date><detail type="volume"><number>42</number><caption>vol.</caption></detail><detail type="issue"><number>1-4</number><caption>no.</caption></detail><extent unit="pages"><start>197</start><end>209</end></extent></part><recordInfo><recordOrigin>Springer-Verlag, 1990</recordOrigin></recordInfo></relatedItem><identifier type="istex">59864FA774B591DBCD9FC3C017A4BB438FCA3FDE</identifier><identifier type="DOI">10.1007/BF01162691</identifier><identifier type="ArticleID">BF01162691</identifier><identifier type="ArticleID">Art12</identifier><accessCondition type="use and reproduction" contentType="copyright">Springer-Verlag 1990, 1990</accessCondition><recordInfo><recordContentSource>SPRINGER</recordContentSource><recordOrigin>Springer-Verlag 1990, 1990</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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