Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya
Identifieur interne : 000F34 ( Main/Corpus ); précédent : 000F33; suivant : 000F35Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya
Auteurs : John M. Cottle ; Micah J. Jessup ; Dennis L. Newell ; Matthew S. A. Horstwood ; Stephen R. Noble ; Randall R. Parrish ; David J. Waters ; Michael P. SearleSource :
- Tectonics [ 0278-7407 ] ; 2009-02.
Abstract
The Ama Drime Massif (ADM) is an elongate north‐south trending antiformal feature that extends ∼70 km north across the crest of the South Tibetan Himalaya and offsets the position of the South Tibetan Detachment system. A detailed U(‐Th)‐Pb geochronologic study of granulitized mafic eclogites and associated rocks from the footwall of the ADM yields important insights into the middle to late Miocene tectonic evolution of the Himalayan orogen. The mafic igneous precursor to the granulitized eclogites is 986.6 ± 1.8 Ma and was intruded into the paleoproterozoic (1799 ± 9 Ma) Ama Drime orthogneiss, the latter being similar in age to rocks previously assigned to the Lesser Himalayan Series in the Himalayan foreland. The original eclogite‐facies mineral assemblage in the mafic rocks has been strongly overprinted by granulite facies metamorphism at 750°C and 0.7–0.8 GPa. In the host Ama Drime orthogneiss, the granulite event is correlated with synkinematic sillimanite‐grade metamorphism and muscovite dehydration melting. Monazite and xenotime ages indicate that the granulite metamorphism and associated anatexis occurred at <13.2 ± 1.4 Ma. High‐grade metamorphism was followed by postkinematic leucogranite dyke emplacement at 11.6 ± 0.4 Ma. This integrated data set indicates that high‐temperature metamorphism, decompression, and exhumation of the ADM postdates mid‐Miocene south directed midcrustal extrusion and is kinematically linked to orogen‐parallel extension.
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DOI: 10.1029/2008TC002256
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Searle</name><affiliation><mods:affiliation>Department of Earth Sciences, University of Oxford, Oxford, UK</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Tectonics</title><title level="j" type="abbrev">Tectonics</title><idno type="ISSN">0278-7407</idno><idno type="eISSN">1944-9194</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2009-02">2009-02</date><biblScope unit="volume">28</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="n/a">n/a</biblScope><biblScope unit="page" to="n/a">n/a</biblScope></imprint><idno type="ISSN">0278-7407</idno></series><idno type="istex">4D41F309AC5E79CA2C2B5752F90D65FEECE14178</idno><idno type="DOI">10.1029/2008TC002256</idno><idno type="ArticleID">2008TC002256</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0278-7407</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">The Ama Drime Massif (ADM) is an elongate north‐south trending antiformal feature that extends ∼70 km north across the crest of the South Tibetan Himalaya and offsets the position of the South Tibetan Detachment system. A detailed U(‐Th)‐Pb geochronologic study of granulitized mafic eclogites and associated rocks from the footwall of the ADM yields important insights into the middle to late Miocene tectonic evolution of the Himalayan orogen. The mafic igneous precursor to the granulitized eclogites is 986.6 ± 1.8 Ma and was intruded into the paleoproterozoic (1799 ± 9 Ma) Ama Drime orthogneiss, the latter being similar in age to rocks previously assigned to the Lesser Himalayan Series in the Himalayan foreland. The original eclogite‐facies mineral assemblage in the mafic rocks has been strongly overprinted by granulite facies metamorphism at 750°C and 0.7–0.8 GPa. In the host Ama Drime orthogneiss, the granulite event is correlated with synkinematic sillimanite‐grade metamorphism and muscovite dehydration melting. Monazite and xenotime ages indicate that the granulite metamorphism and associated anatexis occurred at <13.2 ± 1.4 Ma. High‐grade metamorphism was followed by postkinematic leucogranite dyke emplacement at 11.6 ± 0.4 Ma. This integrated data set indicates that high‐temperature metamorphism, decompression, and exhumation of the ADM postdates mid‐Miocene south directed midcrustal extrusion and is kinematically linked to orogen‐parallel extension.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>John M. Cottle</name><affiliations><json:string>Department of Earth Sciences, University of Oxford, Oxford, UK</json:string><json:string>Now at NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</json:string><json:string>E-mail: john.cottle@bgs.ac.uk</json:string></affiliations></json:item><json:item><name>Micah J. 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A detailed U(‐Th)‐Pb geochronologic study of granulitized mafic eclogites and associated rocks from the footwall of the ADM yields important insights into the middle to late Miocene tectonic evolution of the Himalayan orogen. The mafic igneous precursor to the granulitized eclogites is 986.6 ± 1.8 Ma and was intruded into the paleoproterozoic (1799 ± 9 Ma) Ama Drime orthogneiss, the latter being similar in age to rocks previously assigned to the Lesser Himalayan Series in the Himalayan foreland. The original eclogite‐facies mineral assemblage in the mafic rocks has been strongly overprinted by granulite facies metamorphism at 750°C and 0.7–0.8 GPa. In the host Ama Drime orthogneiss, the granulite event is correlated with synkinematic sillimanite‐grade metamorphism and muscovite dehydration melting. Monazite and xenotime ages indicate that the granulite metamorphism and associated anatexis occurred at >13.2 ± 1.4 Ma. High‐grade metamorphism was followed by postkinematic leucogranite dyke emplacement at 11.6 ± 0.4 Ma. This integrated data set indicates that high‐temperature metamorphism, decompression, and exhumation of the ADM postdates mid‐Miocene south directed midcrustal extrusion and is kinematically linked to orogen‐parallel extension.</abstract><qualityIndicators><score>8.056</score><pdfVersion>1.4</pdfVersion><pdfPageSize>612 x 792 pts (letter)</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>6</keywordCount><abstractCharCount>1479</abstractCharCount><pdfWordCount>14184</pdfWordCount><pdfCharCount>96433</pdfCharCount><pdfPageCount>25</pdfPageCount><abstractWordCount>213</abstractWordCount></qualityIndicators><title>Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya</title><genre><json:string>article</json:string></genre><host><volume>28</volume><publisherId><json:string>TECT</json:string></publisherId><pages><total>25</total><last>n/a</last><first>n/a</first></pages><issn><json:string>0278-7407</json:string></issn><issue>1</issue><subject><json:item><value>GEOCHRONOLOGY</value></json:item><json:item><value>Radioisotope geochronology</value></json:item><json:item><value>MINERALOGY AND PETROLOGY</value></json:item><json:item><value>Metamorphic petrology</value></json:item><json:item><value>Pressure‐temperature‐time paths</value></json:item><json:item><value>TECTONOPHYSICS</value></json:item><json:item><value>Continental margins: convergent</value></json:item><json:item><value>Tectonics and magmatism</value></json:item></subject><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1944-9194</json:string></eissn><title>Tectonics</title><doi><json:string>10.1002/(ISSN)1944-9194</json:string></doi></host><publicationDate>2009</publicationDate><copyrightDate>2009</copyrightDate><doi><json:string>10.1029/2008TC002256</json:string></doi><id>4D41F309AC5E79CA2C2B5752F90D65FEECE14178</id><score>0.08840486</score><fulltext><json:item><original>true</original><mimetype>application/pdf</mimetype><extension>pdf</extension><uri>https://api.istex.fr/document/4D41F309AC5E79CA2C2B5752F90D65FEECE14178/fulltext/pdf</uri></json:item><json:item><original>false</original><mimetype>application/zip</mimetype><extension>zip</extension><uri>https://api.istex.fr/document/4D41F309AC5E79CA2C2B5752F90D65FEECE14178/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/4D41F309AC5E79CA2C2B5752F90D65FEECE14178/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Publishing Ltd</publisher><availability><p>WILEY</p></availability><date>2009</date></publicationStmt><notesStmt><note>Tab‐delimited Table 1.Tab‐delimited Table 2.Tab‐delimited Table 3.Tab‐delimited Table 4.Tab‐delimited Table 5.Tab‐delimited Table 6.</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya</title><author><persName><forename type="first">John M.</forename><surname>Cottle</surname></persName><email>john.cottle@bgs.ac.uk</email><affiliation>Department of Earth Sciences, University of Oxford, Oxford, UK</affiliation><affiliation>Now at NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation></author><author><persName><forename type="first">Micah J.</forename><surname>Jessup</surname></persName><affiliation>Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA</affiliation><affiliation>Now at Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee, USA</affiliation></author><author><persName><forename type="first">Dennis L.</forename><surname>Newell</surname></persName><affiliation>Department of Natural and Environmental Sciences, Western State College of Colorado, Colorado, Gunnison, USA</affiliation></author><author><persName><forename type="first">Matthew S. A.</forename><surname>Horstwood</surname></persName><affiliation>NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation></author><author><persName><forename type="first">Stephen R.</forename><surname>Noble</surname></persName><affiliation>NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation></author><author><persName><forename type="first">Randall R.</forename><surname>Parrish</surname></persName><affiliation>NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation></author><author><persName><forename type="first">David J.</forename><surname>Waters</surname></persName><affiliation>Department of Earth Sciences, University of Oxford, Oxford, UK</affiliation></author><author><persName><forename type="first">Michael P.</forename><surname>Searle</surname></persName><affiliation>Department of Earth Sciences, University of Oxford, Oxford, UK</affiliation></author></analytic><monogr><title level="j">Tectonics</title><title level="j" type="abbrev">Tectonics</title><idno type="pISSN">0278-7407</idno><idno type="eISSN">1944-9194</idno><idno type="DOI">10.1002/(ISSN)1944-9194</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2009-02"></date><biblScope unit="volume">28</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="n/a">n/a</biblScope><biblScope unit="page" to="n/a">n/a</biblScope></imprint></monogr><idno type="istex">4D41F309AC5E79CA2C2B5752F90D65FEECE14178</idno><idno type="DOI">10.1029/2008TC002256</idno><idno type="ArticleID">2008TC002256</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2009</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>The Ama Drime Massif (ADM) is an elongate north‐south trending antiformal feature that extends ∼70 km north across the crest of the South Tibetan Himalaya and offsets the position of the South Tibetan Detachment system. A detailed U(‐Th)‐Pb geochronologic study of granulitized mafic eclogites and associated rocks from the footwall of the ADM yields important insights into the middle to late Miocene tectonic evolution of the Himalayan orogen. The mafic igneous precursor to the granulitized eclogites is 986.6 ± 1.8 Ma and was intruded into the paleoproterozoic (1799 ± 9 Ma) Ama Drime orthogneiss, the latter being similar in age to rocks previously assigned to the Lesser Himalayan Series in the Himalayan foreland. The original eclogite‐facies mineral assemblage in the mafic rocks has been strongly overprinted by granulite facies metamorphism at 750°C and 0.7–0.8 GPa. In the host Ama Drime orthogneiss, the granulite event is correlated with synkinematic sillimanite‐grade metamorphism and muscovite dehydration melting. Monazite and xenotime ages indicate that the granulite metamorphism and associated anatexis occurred at <13.2 ± 1.4 Ma. High‐grade metamorphism was followed by postkinematic leucogranite dyke emplacement at 11.6 ± 0.4 Ma. This integrated data set indicates that high‐temperature metamorphism, decompression, and exhumation of the ADM postdates mid‐Miocene south directed midcrustal extrusion and is kinematically linked to orogen‐parallel extension.</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>Himalaya</term></item><item><term>eclogite</term></item><item><term>granulite</term></item><item><term>metamorphism</term></item><item><term>uranium‐thorium‐lead geochronology</term></item><item><term>monazite</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>GEOCHRONOLOGY</term></item><item><term>Radioisotope geochronology</term></item><item><term>MINERALOGY AND PETROLOGY</term></item><item><term>Metamorphic petrology</term></item><item><term>Pressure‐temperature‐time paths</term></item><item><term>TECTONOPHYSICS</term></item><item><term>Continental margins: convergent</term></item><item><term>Tectonics and magmatism</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2008-01-07">Received</change><change when="2008-11-04">Registration</change><change when="2009-02">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/4D41F309AC5E79CA2C2B5752F90D65FEECE14178/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 type="serialArticle" version="2.0" xml:lang="en" xml:id="tect2013"><header><publicationMeta level="product"><doi>10.1002/(ISSN)1944-9194</doi><issn type="print">0278-7407</issn><issn type="electronic">1944-9194</issn><idGroup><id type="product" value="TECT"></id><id type="coden" value="TCTNDM"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="TECTONICS">Tectonics</title><title type="short">Tectonics</title></titleGroup></publicationMeta><publicationMeta level="part" position="10"><doi>10.1002/tect.v28.1</doi><numberingGroup><numbering type="journalVolume" number="28">28</numbering><numbering type="journalIssue">1</numbering></numberingGroup><coverDate startDate="2009-02">February 2009</coverDate></publicationMeta><publicationMeta level="unit" position="60" type="article" status="forIssue"><doi>10.1029/2008TC002256</doi><idGroup><id type="editorialOffice" value="2008TC002256"></id><id type="society" value="TC1002"></id><id type="unit" value="TECT2013"></id></idGroup><countGroup><count type="pageTotal" number="25"></count></countGroup><copyright ownership="thirdParty">Copyright 2009 by the American Geophysical Union.</copyright><eventGroup><event type="manuscriptReceived" date="2008-01-07"></event><event type="manuscriptRevised" date="2008-10-01"></event><event type="manuscriptAccepted" date="2008-11-04"></event><event type="firstOnline" date="2009-01-31"></event><event type="publishedOnlineFinalForm" date="2009-01-31"></event><event type="xmlConverted" agent="SPi Global Converter:AGUv3.44_TO_WileyML3Gv1.0.3 version:1.1; AGU2WileyML3G Final Clean Up v1.0; WileyML 3G Packaging Tool v1.0" date="2012-12-31"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-02-10"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-11-04"></event></eventGroup><numberingGroup><numbering type="pageFirst">n/a</numbering><numbering type="pageLast">n/a</numbering></numberingGroup><subjectInfo><subject href="http://psi.agu.org/taxonomy5/1100">GEOCHRONOLOGY</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/1115">Radioisotope geochronology</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/3600">MINERALOGY AND PETROLOGY</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/3660">Metamorphic petrology</subject><subject href="http://psi.agu.org/taxonomy5/3652">Pressure‐temperature‐time paths</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/8104">Continental margins: convergent</subject><subject href="http://psi.agu.org/taxonomy5/8178">Tectonics and magmatism</subject></subjectInfo></subjectInfo><selfCitationGroup><citation xml:id="tect2013-cit-0000" type="self"><author><familyName>Cottle</familyName>, <givenNames>J. M.</givenNames></author>, <author><givenNames>M. J.</givenNames> <familyName>Jessup</familyName></author>, <author><givenNames>D. L.</givenNames> <familyName>Newell</familyName></author>, <author><givenNames>M. S. A.</givenNames> <familyName>Horstwood</familyName></author>, <author><givenNames>S. R.</givenNames> <familyName>Noble</familyName></author>, <author><givenNames>R. R.</givenNames> <familyName>Parrish</familyName></author>, <author><givenNames>D. J.</givenNames> <familyName>Waters</familyName></author>, and <author><givenNames>M. P.</givenNames> <familyName>Searle</familyName></author> (<pubYear year="2009">2009</pubYear>), <articleTitle>Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya</articleTitle>, <journalTitle>Tectonics</journalTitle>, <vol>28</vol>, TC1002, doi:<accessionId ref="info:doi/10.1029/2008TC002256">10.1029/2008TC002256</accessionId>.</citation></selfCitationGroup><objectNameGroup><objectName elementName="appendix">Appendix</objectName></objectNameGroup><linkGroup><link type="toTypesetVersion" href="file:TECT.TECT2013.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="11"></count><count type="tableTotal" number="6"></count></countGroup><titleGroup><title type="main">Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya</title><title type="short">GEOCHRONOLOGY OF AMA DRIME ECLOGITES</title><title type="shortAuthors">Cottle <i>et al</i>.</title></titleGroup><creators><creator creatorRole="author" xml:id="tect2013-cr-0001" affiliationRef="#tect2013-aff-0001 #tect2013-aff-0005"><personName><givenNames>John M.</givenNames> <familyName>Cottle</familyName></personName><contactDetails><email normalForm="john.cottle@bgs.ac.uk">john.cottle@bgs.ac.uk</email></contactDetails></creator><creator creatorRole="author" xml:id="tect2013-cr-0002" affiliationRef="#tect2013-aff-0002 #tect2013-aff-0006"><personName><givenNames>Micah J.</givenNames> <familyName>Jessup</familyName></personName></creator><creator creatorRole="author" xml:id="tect2013-cr-0003" affiliationRef="#tect2013-aff-0003"><personName><givenNames>Dennis L.</givenNames> <familyName>Newell</familyName></personName></creator><creator creatorRole="author" xml:id="tect2013-cr-0004" affiliationRef="#tect2013-aff-0004"><personName><givenNames>Matthew S. A.</givenNames> <familyName>Horstwood</familyName></personName></creator><creator creatorRole="author" xml:id="tect2013-cr-0005" affiliationRef="#tect2013-aff-0004"><personName><givenNames>Stephen R.</givenNames> <familyName>Noble</familyName></personName></creator><creator creatorRole="author" xml:id="tect2013-cr-0006" affiliationRef="#tect2013-aff-0004"><personName><givenNames>Randall R.</givenNames> <familyName>Parrish</familyName></personName></creator><creator creatorRole="author" xml:id="tect2013-cr-0007" affiliationRef="#tect2013-aff-0001"><personName><givenNames>David J.</givenNames> <familyName>Waters</familyName></personName></creator><creator creatorRole="author" xml:id="tect2013-cr-0008" affiliationRef="#tect2013-aff-0001"><personName><givenNames>Michael P.</givenNames> <familyName>Searle</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="GB" type="organization" xml:id="tect2013-aff-0001"><orgDiv>Department of Earth Sciences</orgDiv><orgName>University of Oxford</orgName><address><city>Oxford</city><country>UK</country></address></affiliation><affiliation countryCode="US" type="organization" xml:id="tect2013-aff-0002"><orgDiv>Department of Geosciences</orgDiv><orgName>Virginia Polytechnic Institute and State University</orgName><address><city>Blacksburg</city><countryPart>Virginia</countryPart><country>USA</country></address></affiliation><affiliation countryCode="US" type="organization" xml:id="tect2013-aff-0003"><orgDiv>Department of Natural and Environmental Sciences</orgDiv><orgName>Western State College of Colorado</orgName><address><city>Gunnison</city><countryPart>Colorado</countryPart><country>USA</country></address></affiliation><affiliation countryCode="GB" type="organization" xml:id="tect2013-aff-0004"><orgDiv>NERC Isotope Geosciences Laboratory</orgDiv><orgName>British Geological Survey</orgName><address><city>Keyworth</city><country>UK</country></address></affiliation><affiliation countryCode="GB" type="organization" xml:id="tect2013-aff-0005"><unparsedAffiliation>Now at NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</unparsedAffiliation></affiliation><affiliation countryCode="US" type="organization" xml:id="tect2013-aff-0006"><unparsedAffiliation>Now at Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee, USA</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="tect2013-kwd-0001">Himalaya</keyword><keyword xml:id="tect2013-kwd-0002">eclogite</keyword><keyword xml:id="tect2013-kwd-0003">granulite</keyword><keyword xml:id="tect2013-kwd-0004">metamorphism</keyword><keyword xml:id="tect2013-kwd-0005">uranium‐thorium‐lead geochronology</keyword><keyword xml:id="tect2013-kwd-0006">monazite</keyword></keywordGroup><supportingInformation><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:02787407:media:tect2013:tect2013-sup-0001-t01"></mediaResource><caption>Tab‐delimited Table 1.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:02787407:media:tect2013:tect2013-sup-0002-t02"></mediaResource><caption>Tab‐delimited Table 2.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:02787407:media:tect2013:tect2013-sup-0003-t03"></mediaResource><caption>Tab‐delimited Table 3.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:02787407:media:tect2013:tect2013-sup-0004-t04"></mediaResource><caption>Tab‐delimited Table 4.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:02787407:media:tect2013:tect2013-sup-0005-t05"></mediaResource><caption>Tab‐delimited Table 5.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:02787407:media:tect2013:tect2013-sup-0006-t06"></mediaResource><caption>Tab‐delimited Table 6.</caption></supportingInfoItem></supportingInformation><abstractGroup><abstract type="main"><p xml:id="tect2013-para-0001" label="1">The Ama Drime Massif (ADM) is an elongate north‐south trending antiformal feature that extends ∼70 km north across the crest of the South Tibetan Himalaya and offsets the position of the South Tibetan Detachment system. A detailed U(‐Th)‐Pb geochronologic study of granulitized mafic eclogites and associated rocks from the footwall of the ADM yields important insights into the middle to late Miocene tectonic evolution of the Himalayan orogen. The mafic igneous precursor to the granulitized eclogites is 986.6 ± 1.8 Ma and was intruded into the paleoproterozoic (1799 ± 9 Ma) Ama Drime orthogneiss, the latter being similar in age to rocks previously assigned to the Lesser Himalayan Series in the Himalayan foreland. The original eclogite‐facies mineral assemblage in the mafic rocks has been strongly overprinted by granulite facies metamorphism at 750°C and 0.7–0.8 GPa. In the host Ama Drime orthogneiss, the granulite event is correlated with synkinematic sillimanite‐grade metamorphism and muscovite dehydration melting. Monazite and xenotime ages indicate that the granulite metamorphism and associated anatexis occurred at <13.2 ± 1.4 Ma. High‐grade metamorphism was followed by postkinematic leucogranite dyke emplacement at 11.6 ± 0.4 Ma. This integrated data set indicates that high‐temperature metamorphism, decompression, and exhumation of the ADM postdates mid‐Miocene south directed midcrustal extrusion and is kinematically linked to orogen‐parallel extension.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>GEOCHRONOLOGY OF AMA DRIME ECLOGITES</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya</title></titleInfo><name type="personal"><namePart type="given">John M.</namePart><namePart type="family">Cottle</namePart><affiliation>Department of Earth Sciences, University of Oxford, Oxford, UK</affiliation><affiliation>Now at NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation><affiliation>E-mail: john.cottle@bgs.ac.uk</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Micah J.</namePart><namePart type="family">Jessup</namePart><affiliation>Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA</affiliation><affiliation>Now at Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Dennis L.</namePart><namePart type="family">Newell</namePart><affiliation>Department of Natural and Environmental Sciences, Western State College of Colorado, Colorado, Gunnison, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Matthew S. A.</namePart><namePart type="family">Horstwood</namePart><affiliation>NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Stephen R.</namePart><namePart type="family">Noble</namePart><affiliation>NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Randall R.</namePart><namePart type="family">Parrish</namePart><affiliation>NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">David J.</namePart><namePart type="family">Waters</namePart><affiliation>Department of Earth Sciences, University of Oxford, Oxford, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Michael P.</namePart><namePart type="family">Searle</namePart><affiliation>Department of Earth Sciences, University of Oxford, Oxford, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">2009-02</dateIssued><dateCaptured encoding="w3cdtf">2008-01-07</dateCaptured><dateValid encoding="w3cdtf">2008-11-04</dateValid><edition>Cottle, J. M., M. J. Jessup, D. L. Newell, M. S. A. Horstwood, S. R. Noble, R. R. Parrish, D. J. Waters, and M. P. Searle (2009), Geochronology of granulitized eclogite from the Ama Drime Massif: Implications for the tectonic evolution of the South Tibetan Himalaya, Tectonics, 28, TC1002, doi:10.1029/2008TC002256.</edition><copyrightDate encoding="w3cdtf">2009</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">11</extent><extent unit="tables">6</extent></physicalDescription><abstract>The Ama Drime Massif (ADM) is an elongate north‐south trending antiformal feature that extends ∼70 km north across the crest of the South Tibetan Himalaya and offsets the position of the South Tibetan Detachment system. A detailed U(‐Th)‐Pb geochronologic study of granulitized mafic eclogites and associated rocks from the footwall of the ADM yields important insights into the middle to late Miocene tectonic evolution of the Himalayan orogen. The mafic igneous precursor to the granulitized eclogites is 986.6 ± 1.8 Ma and was intruded into the paleoproterozoic (1799 ± 9 Ma) Ama Drime orthogneiss, the latter being similar in age to rocks previously assigned to the Lesser Himalayan Series in the Himalayan foreland. The original eclogite‐facies mineral assemblage in the mafic rocks has been strongly overprinted by granulite facies metamorphism at 750°C and 0.7–0.8 GPa. In the host Ama Drime orthogneiss, the granulite event is correlated with synkinematic sillimanite‐grade metamorphism and muscovite dehydration melting. Monazite and xenotime ages indicate that the granulite metamorphism and associated anatexis occurred at <13.2 ± 1.4 Ma. High‐grade metamorphism was followed by postkinematic leucogranite dyke emplacement at 11.6 ± 0.4 Ma. This integrated data set indicates that high‐temperature metamorphism, decompression, and exhumation of the ADM postdates mid‐Miocene south directed midcrustal extrusion and is kinematically linked to orogen‐parallel extension.</abstract><note type="additional physical form">Tab‐delimited Table 1.Tab‐delimited Table 2.Tab‐delimited Table 3.Tab‐delimited Table 4.Tab‐delimited Table 5.Tab‐delimited Table 6.</note><subject><genre>keywords</genre><topic>Himalaya</topic><topic>eclogite</topic><topic>granulite</topic><topic>metamorphism</topic><topic>uranium‐thorium‐lead geochronology</topic><topic>monazite</topic></subject><relatedItem type="host"><titleInfo><title>Tectonics</title></titleInfo><titleInfo type="abbreviated"><title>Tectonics</title></titleInfo><genre type="journal">journal</genre><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/taxonomy5/1100">GEOCHRONOLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1115">Radioisotope geochronology</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3600">MINERALOGY AND PETROLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3660">Metamorphic petrology</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3652">Pressure‐temperature‐time paths</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8104">Continental margins: convergent</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8178">Tectonics and magmatism</topic></subject><identifier type="ISSN">0278-7407</identifier><identifier type="eISSN">1944-9194</identifier><identifier type="DOI">10.1002/(ISSN)1944-9194</identifier><identifier type="CODEN">TCTNDM</identifier><identifier type="PublisherID">TECT</identifier><part><date>2009</date><detail type="volume"><caption>vol.</caption><number>28</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>25</total></extent></part></relatedItem><identifier type="istex">4D41F309AC5E79CA2C2B5752F90D65FEECE14178</identifier><identifier type="DOI">10.1029/2008TC002256</identifier><identifier type="ArticleID">2008TC002256</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2009 by the American Geophysical Union.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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