Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa
Identifieur interne : 001525 ( Istex/Corpus ); précédent : 001524; suivant : 001526Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa
Auteurs : K. S. Viljoen ; D. J. Schulze ; A. G. QuadlingSource :
- Journal of Petrology [ 0022-3530 ] ; 2005-10.
English descriptors
- KwdEn :
Abstract
Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.
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DOI: 10.1093/petrology/egi047
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ISTEX:61384AAB379FB71F7AA55AA2BBA5AC7EEA0103A6Le document en format XML
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Viljoen</name><affiliation><mods:affiliation>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</mods:affiliation></affiliation><affiliation><mods:affiliation>BERNARD PRICE INSTITUTE OF GEOPHYSICAL RESEARCH, HUGH ALLSOPP LABORATORY, UNIVERSITY OF THE WITWATERSRAND, PRIVATE BAG 3, WITS, JOHANNESBURG, 2050, SOUTH AFRICA</mods:affiliation></affiliation><affiliation><mods:affiliation>*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315.</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: fanus.viljoen@debeersgroup.com</mods:affiliation></affiliation></author><author><name sortKey="Schulze, D J" sort="Schulze, D J" uniqKey="Schulze D" first="D. J." last="Schulze">D. J. Schulze</name><affiliation><mods:affiliation>DEPARTMENT OF GEOLOGY, UNIVERSITY OF TORONTO, ERINDALE COLLEGE, MISSISSAUGA, ONTARIO, CANADA L5L 1C6</mods:affiliation></affiliation></author><author><name sortKey="Quadling, A G" sort="Quadling, A G" uniqKey="Quadling A" first="A. G." last="Quadling">A. G. Quadling</name><affiliation><mods:affiliation>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Petrology</title><title level="j" type="abbrev">J. Petrology</title><idno type="ISSN">0022-3530</idno><idno type="eISSN">1460-2415</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2005-10">2005-10</date><biblScope unit="volume">46</biblScope><biblScope unit="issue">10</biblScope><biblScope unit="page" from="2059">2059</biblScope><biblScope unit="page" to="2090">2090</biblScope></imprint><idno type="ISSN">0022-3530</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3530</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>REE</term><term>diamonds</term><term>eclogite xenoliths</term><term>isotopic composition</term><term>trace elements</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.</div></front></TEI><istex><corpusName>oup</corpusName><author><json:item><name>K. S. VILJOEN</name><affiliations><json:string>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</json:string><json:string>BERNARD PRICE INSTITUTE OF GEOPHYSICAL RESEARCH, HUGH ALLSOPP LABORATORY, UNIVERSITY OF THE WITWATERSRAND, PRIVATE BAG 3, WITS, JOHANNESBURG, 2050, SOUTH AFRICA</json:string><json:string>*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315.</json:string><json:string>E-mail: fanus.viljoen@debeersgroup.com</json:string></affiliations></json:item><json:item><name>D. J. SCHULZE</name><affiliations><json:string>DEPARTMENT OF GEOLOGY, UNIVERSITY OF TORONTO, ERINDALE COLLEGE, MISSISSAUGA, ONTARIO, CANADA L5L 1C6</json:string></affiliations></json:item><json:item><name>A. G. QUADLING</name><affiliations><json:string>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. 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The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. 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Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org</p></availability><date>2005-05-20</date></publicationStmt><notesStmt><note>*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315. E-mail: fanus.viljoen@debeersgroup.com</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa</title><author xml:id="author-0000"><persName><forename type="first">K. S.</forename><surname>VILJOEN</surname></persName><email>fanus.viljoen@debeersgroup.com</email><affiliation>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</affiliation><affiliation>BERNARD PRICE INSTITUTE OF GEOPHYSICAL RESEARCH, HUGH ALLSOPP LABORATORY, UNIVERSITY OF THE WITWATERSRAND, PRIVATE BAG 3, WITS, JOHANNESBURG, 2050, SOUTH AFRICA</affiliation><affiliation>*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315.</affiliation></author><author xml:id="author-0001"><persName><forename type="first">D. J.</forename><surname>SCHULZE</surname></persName><affiliation>DEPARTMENT OF GEOLOGY, UNIVERSITY OF TORONTO, ERINDALE COLLEGE, MISSISSAUGA, ONTARIO, CANADA L5L 1C6</affiliation></author><author xml:id="author-0002"><persName><forename type="first">A. G.</forename><surname>QUADLING</surname></persName><affiliation>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</affiliation></author><idno type="istex">61384AAB379FB71F7AA55AA2BBA5AC7EEA0103A6</idno><idno type="DOI">10.1093/petrology/egi047</idno><idno type="local">egi047</idno></analytic><monogr><title level="j">Journal of Petrology</title><title level="j" type="abbrev">J. Petrology</title><idno type="pISSN">0022-3530</idno><idno type="eISSN">1460-2415</idno><idno type="PublisherID">petroj</idno><idno type="PublisherID-hwp">petrology</idno><idno type="PublisherID-nlm-ta">J Petrology</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2005-10"></date><biblScope unit="volume">46</biblScope><biblScope unit="issue">10</biblScope><biblScope unit="page" from="2059">2059</biblScope><biblScope unit="page" to="2090">2090</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2005-05-20</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>KWD</head><item><term>eclogite xenoliths</term></item><item><term>trace elements</term></item><item><term>REE</term></item><item><term>isotopic composition</term></item><item><term>diamonds</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2005-05-20">Created</change><change when="2005-10">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/61384AAB379FB71F7AA55AA2BBA5AC7EEA0103A6/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus oup" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="US-ASCII"</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD Journal Publishing DTD v2.3 20070202//EN" URI="journalpublishing.dtd" name="istex:docType"></istex:docType><istex:document><article xml:lang="en" article-type="research-article"><front><journal-meta><journal-id journal-id-type="hwp">petrology</journal-id><journal-id journal-id-type="nlm-ta">J Petrology</journal-id><journal-id journal-id-type="publisher-id">petroj</journal-id><journal-title>Journal of Petrology</journal-title><abbrev-journal-title abbrev-type="publisher">J. Petrology</abbrev-journal-title><issn pub-type="ppub">0022-3530</issn><issn pub-type="epub">1460-2415</issn><publisher><publisher-name>Oxford University Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="other">egi047</article-id><article-id pub-id-type="doi">10.1093/petrology/egi047</article-id><article-categories><subj-group subj-group-type="heading"><subject>ARTICLES</subject></subj-group></article-categories><title-group><article-title>Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>VILJOEN</surname><given-names>K. S.</given-names></name><xref rid="AFF1">1</xref><xref rid="AFF2">2</xref><xref rid="COR1">*</xref></contrib><contrib contrib-type="author"><name><surname>SCHULZE</surname><given-names>D. J.</given-names></name><xref rid="AFF3">3</xref></contrib><contrib contrib-type="author"><name><surname>QUADLING</surname><given-names>A. G.</given-names></name><xref rid="AFF1">1</xref></contrib><aff id="AFF1"><label>1</label>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</aff><aff id="AFF2"><label>2</label>BERNARD PRICE INSTITUTE OF GEOPHYSICAL RESEARCH, HUGH ALLSOPP LABORATORY, UNIVERSITY OF THE WITWATERSRAND, PRIVATE BAG 3, WITS, JOHANNESBURG, 2050, SOUTH AFRICA</aff><aff id="AFF3"><label>3</label>DEPARTMENT OF GEOLOGY, UNIVERSITY OF TORONTO, ERINDALE COLLEGE, MISSISSAUGA, ONTARIO, CANADA L5L 1C6</aff></contrib-group><author-notes><corresp id="COR1"><label>*</label>Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315. E-mail: <ext-link xlink:href="fanus.viljoen@debeersgroup.com" ext-link-type="email">fanus.viljoen@debeersgroup.com</ext-link></corresp></author-notes><pub-date pub-type="epub"><day>20</day><month>5</month><year>2005</year></pub-date><pub-date pub-type="ppub"><month>October</month><year>2005</year></pub-date><volume>46</volume><issue>10</issue><fpage>2059</fpage><lpage>2090</lpage><history><date date-type="accepted"><day>4</day><month>4</month><year>2005</year></date><date date-type="received"><day>15</day><month>3</month><year>2004</year></date></history><permissions><copyright-statement>© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org</copyright-statement><copyright-year>2005</copyright-year></permissions><abstract xml:lang="en"><p>Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme <sup>87</sup>Sr/<sup>86</sup>Sr (∼0·915) and extreme <sup>143</sup>Nd/<sup>144</sup>Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.</p></abstract><kwd-group kwd-group-type="KWD" xml:lang="en"><kwd>eclogite xenoliths</kwd><kwd>trace elements</kwd><kwd>REE</kwd><kwd>isotopic composition</kwd><kwd>diamonds</kwd></kwd-group><custom-meta-wrap><custom-meta><meta-name>hwp-legacy-fpage</meta-name><meta-value>2059</meta-value></custom-meta><custom-meta><meta-name>cover-date</meta-name><meta-value>October 2005</meta-value></custom-meta><custom-meta><meta-name>hwp-legacy-dochead</meta-name><meta-value>ARTICLE</meta-value></custom-meta></custom-meta-wrap></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa</title></titleInfo><name type="personal"><namePart type="given">K. S.</namePart><namePart type="family">VILJOEN</namePart><affiliation>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</affiliation><affiliation>BERNARD PRICE INSTITUTE OF GEOPHYSICAL RESEARCH, HUGH ALLSOPP LABORATORY, UNIVERSITY OF THE WITWATERSRAND, PRIVATE BAG 3, WITS, JOHANNESBURG, 2050, SOUTH AFRICA</affiliation><affiliation>*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315.</affiliation><affiliation>E-mail: fanus.viljoen@debeersgroup.com</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D. J.</namePart><namePart type="family">SCHULZE</namePart><affiliation>DEPARTMENT OF GEOLOGY, UNIVERSITY OF TORONTO, ERINDALE COLLEGE, MISSISSAUGA, ONTARIO, CANADA L5L 1C6</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A. G.</namePart><namePart type="family">QUADLING</namePart><affiliation>GEOSCIENCE CENTRE, DE BEERS CONSOLIDATED MINES LTD, P.O. BOX 82232, SOUTHDALE, 2135, SOUTH AFRICA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article"></genre><originInfo><publisher>Oxford University Press</publisher><dateIssued encoding="w3cdtf">2005-10</dateIssued><dateCreated encoding="w3cdtf">2005-05-20</dateCreated><copyrightDate encoding="w3cdtf">2005</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Eclogite xenolith varieties at Kaalvallei include accessory-free bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite, garnet-websterite, alkremite and spinel-bearing eclogite. The xenoliths can be accurately classified into previously defined Group I and Group II varieties on both petrographic and geochemical principles. Kaalvallei Group I eclogites (including diamond-bearing eclogite) are considered to derive from a heterogeneous protolith. Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere. Kaalvallei websterite xenoliths might be petrogenetically related to Group II xenoliths. Isotopic data for Kaalvallei corundum-bearing eclogite and alkremite xenoliths do not provide constraints on petrogenesis. Spinel-bearing eclogite xenoliths are ultradepleted in virtually all trace elements, with very low light rare earth element contents, relatively high heavy rare earth element concentrations, extreme 87Sr/86Sr (∼0·915) and extreme 143Nd/144Nd (0·517) isotopic compositions. These xenoliths are considered to be the residues of a partial melting event.</abstract><note type="author-notes">*Corresponding author. Present address: GeoScience Centre, De Beers Consolidated Mines Ltd, P.O. Box 82232, Southdale, 2135, South Africa. Telephone: +27-11-3747873. Fax: +27-11-8351315. E-mail: fanus.viljoen@debeersgroup.com</note><subject lang="en"><genre>KWD</genre><topic>eclogite xenoliths</topic><topic>trace elements</topic><topic>REE</topic><topic>isotopic composition</topic><topic>diamonds</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Petrology</title></titleInfo><titleInfo type="abbreviated"><title>J. Petrology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0022-3530</identifier><identifier type="eISSN">1460-2415</identifier><identifier type="PublisherID">petroj</identifier><identifier type="PublisherID-hwp">petrology</identifier><identifier type="PublisherID-nlm-ta">J Petrology</identifier><part><date>2005</date><detail type="volume"><caption>vol.</caption><number>46</number></detail><detail type="issue"><caption>no.</caption><number>10</number></detail><extent unit="pages"><start>2059</start><end>2090</end></extent></part></relatedItem><identifier type="istex">61384AAB379FB71F7AA55AA2BBA5AC7EEA0103A6</identifier><identifier type="DOI">10.1093/petrology/egi047</identifier><identifier type="local">egi047</identifier><accessCondition type="use and reproduction" contentType="copyright">© The Author 2005. Published by Oxford University Press. All rights reserved. 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