Integrated pressure–temperature–time constraints for the Tso Morari dome (Northwest India): implications for the burial and exhumation path of UHP units in the western Himalaya
Identifieur interne : 002392 ( Istex/Corpus ); précédent : 002391; suivant : 002393Integrated pressure–temperature–time constraints for the Tso Morari dome (Northwest India): implications for the burial and exhumation path of UHP units in the western Himalaya
Auteurs : M. R. St-Onge ; N. Rayner ; R. M. Palin ; M. P. Searle ; D. J. WatersSource :
- Journal of Metamorphic Geology [ 0263-4929 ] ; 2013-06.
Abstract
Northward subduction of the leading edge of the Indian continental margin to depths greater than 100 km during the early Eocene resulted in high‐pressure (HP) quartz‐eclogite to ultrahigh‐pressure (UHP) coesite–eclogite metamorphism at Tso Morari, Ladakh Himalaya, India. Integrated pressure–temperature–time determinations within petrographically well‐constrained settings for zircon‐ and/or monazite‐bearing assemblages in mafic eclogite boudins and host aluminous gneisses at Tso Morari uniquely document segments of both the prograde burial and retrograde exhumation path for HP/UHP units in this portion of the western Himalaya. Poikiloblastic cores and inclusion‐poor rims of compositionally zoned garnet in mafic eclogite were utilized with entrapped inclusions and matrix minerals for thermobarometric calculations and isochemical phase diagram construction, the latter thermodynamic modelling performed with and without the consideration of cation fractionation into garnet during prograde metamorphism. Analysis of the garnet cores document (M1) conditions of 21.5 ± 1.5 kbar and 535 ± 15 °C during early garnet growth and re‐equilibration. Sensitive high resolution ion microprobe (SHRIMP) U–Pb analysis of zircon inclusions in garnet cores yields a maximum age determination of 58.0 ± 2.2 Ma for M1. Peak HP/UHP (M2) conditions are constrained at 25.5–27.5 kbar and 630–645 °C using the assemblage garnet rim–omphacite–rutile–phengite–lawsonite–talc–quartz (coesite), with mineral compositional data and regional considerations consistent with the upper P–T bracket. A SHRIMP U–Pb age determination of 50.8 ± 1.4 Ma for HP/UHP metamorphism is given by M2 zircons analysed in the eclogitic matrix and that are encased in the garnet rim. Two garnet‐bearing assemblages from the Puga gneiss (host to the mafic eclogites) were utilized to constrain the subsequent decompression path. A non‐fractionated isochemical phase diagram for the assemblage phengite–garnet–biotite–plagioclase–quartz–melt documents a restricted (M3) P–T stability field centred on 12.5 ± 0.5 kbar and 690 ± 25 °C. A second non‐fractionated isochemical phase diagram calculated for the lower pressure assemblage garnet–cordierite–sillimanite–biotite–plagioclase–quartz–melt (M4) documents a narrow P–T stability field ranging between 7–8.4 kbar and 705–755 °C, which is consistent with independent multiequilibria P–T determinations. Th–Pb SHRIMP dating of monazite cores surrounded by allanite rims is interpreted to constrain the timing of the M4 equilibration to 45.3 ± 1.1 Ma. Coherently linking metamorphic conditions with petrographically constrained ages at Tso Morari provides an integrated context within which previously published petrological or geochronological results can be evaluated. The new composite path is similar to those published for the Kaghan UHP locality in northern Pakistan, although the calculated 12‐mm a−1 rate of post‐pressure peak decompression at Tso Morari would appear less extreme.
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DOI: 10.1111/jmg.12030
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R." last="St-Onge">M. R. St-Onge</name><affiliation><mods:affiliation>Geological Survey of Canada, 601 Booth St., ON, K1A 0E8, Ottawa, Canada</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: mstonge@nrcan.gc.ca</mods:affiliation></affiliation></author><author><name sortKey="Rayner, N" sort="Rayner, N" uniqKey="Rayner N" first="N." last="Rayner">N. Rayner</name><affiliation><mods:affiliation>Geological Survey of Canada, 601 Booth St., ON, K1A 0E8, Ottawa, Canada</mods:affiliation></affiliation></author><author><name sortKey="Palin, R M" sort="Palin, R M" uniqKey="Palin R" first="R. M." last="Palin">R. M. Palin</name><affiliation><mods:affiliation>Department of Earth Sciences, University of Oxford, South Parks Road, OX1 3AN, Oxford, UK</mods:affiliation></affiliation></author><author><name sortKey="Searle, M P" sort="Searle, M P" uniqKey="Searle M" first="M. P." last="Searle">M. P. 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Geol.</title><idno type="ISSN">0263-4929</idno><idno type="eISSN">1525-1314</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2013-06">2013-06</date><biblScope unit="volume">31</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="469">469</biblScope><biblScope unit="page" to="504">504</biblScope></imprint><idno type="ISSN">0263-4929</idno></series><idno type="istex">47C2DFC43EEFE783C81AA94B79115CBD2C4AB157</idno><idno type="DOI">10.1111/jmg.12030</idno><idno type="ArticleID">JMG12030</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0263-4929</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Northward subduction of the leading edge of the Indian continental margin to depths greater than 100 km during the early Eocene resulted in high‐pressure (HP) quartz‐eclogite to ultrahigh‐pressure (UHP) coesite–eclogite metamorphism at Tso Morari, Ladakh Himalaya, India. Integrated pressure–temperature–time determinations within petrographically well‐constrained settings for zircon‐ and/or monazite‐bearing assemblages in mafic eclogite boudins and host aluminous gneisses at Tso Morari uniquely document segments of both the prograde burial and retrograde exhumation path for HP/UHP units in this portion of the western Himalaya. Poikiloblastic cores and inclusion‐poor rims of compositionally zoned garnet in mafic eclogite were utilized with entrapped inclusions and matrix minerals for thermobarometric calculations and isochemical phase diagram construction, the latter thermodynamic modelling performed with and without the consideration of cation fractionation into garnet during prograde metamorphism. Analysis of the garnet cores document (M1) conditions of 21.5 ± 1.5 kbar and 535 ± 15 °C during early garnet growth and re‐equilibration. Sensitive high resolution ion microprobe (SHRIMP) U–Pb analysis of zircon inclusions in garnet cores yields a maximum age determination of 58.0 ± 2.2 Ma for M1. Peak HP/UHP (M2) conditions are constrained at 25.5–27.5 kbar and 630–645 °C using the assemblage garnet rim–omphacite–rutile–phengite–lawsonite–talc–quartz (coesite), with mineral compositional data and regional considerations consistent with the upper P–T bracket. A SHRIMP U–Pb age determination of 50.8 ± 1.4 Ma for HP/UHP metamorphism is given by M2 zircons analysed in the eclogitic matrix and that are encased in the garnet rim. Two garnet‐bearing assemblages from the Puga gneiss (host to the mafic eclogites) were utilized to constrain the subsequent decompression path. A non‐fractionated isochemical phase diagram for the assemblage phengite–garnet–biotite–plagioclase–quartz–melt documents a restricted (M3) P–T stability field centred on 12.5 ± 0.5 kbar and 690 ± 25 °C. A second non‐fractionated isochemical phase diagram calculated for the lower pressure assemblage garnet–cordierite–sillimanite–biotite–plagioclase–quartz–melt (M4) documents a narrow P–T stability field ranging between 7–8.4 kbar and 705–755 °C, which is consistent with independent multiequilibria P–T determinations. Th–Pb SHRIMP dating of monazite cores surrounded by allanite rims is interpreted to constrain the timing of the M4 equilibration to 45.3 ± 1.1 Ma. Coherently linking metamorphic conditions with petrographically constrained ages at Tso Morari provides an integrated context within which previously published petrological or geochronological results can be evaluated. The new composite path is similar to those published for the Kaghan UHP locality in northern Pakistan, although the calculated 12‐mm a−1 rate of post‐pressure peak decompression at Tso Morari would appear less extreme.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>M. R. 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Integrated pressure–temperature–time determinations within petrographically well‐constrained settings for zircon‐ and/or monazite‐bearing assemblages in mafic eclogite boudins and host aluminous gneisses at Tso Morari uniquely document segments of both the prograde burial and retrograde exhumation path for HP/UHP units in this portion of the western Himalaya. Poikiloblastic cores and inclusion‐poor rims of compositionally zoned garnet in mafic eclogite were utilized with entrapped inclusions and matrix minerals for thermobarometric calculations and isochemical phase diagram construction, the latter thermodynamic modelling performed with and without the consideration of cation fractionation into garnet during prograde metamorphism. Analysis of the garnet cores document (M1) conditions of 21.5 ± 1.5 kbar and 535 ± 15 °C during early garnet growth and re‐equilibration. Sensitive high resolution ion microprobe (SHRIMP) U–Pb analysis of zircon inclusions in garnet cores yields a maximum age determination of 58.0 ± 2.2 Ma for M1. Peak HP/UHP (M2) conditions are constrained at 25.5–27.5 kbar and 630–645 °C using the assemblage garnet rim–omphacite–rutile–phengite–lawsonite–talc–quartz (coesite), with mineral compositional data and regional considerations consistent with the upper P–T bracket. A SHRIMP U–Pb age determination of 50.8 ± 1.4 Ma for HP/UHP metamorphism is given by M2 zircons analysed in the eclogitic matrix and that are encased in the garnet rim. Two garnet‐bearing assemblages from the Puga gneiss (host to the mafic eclogites) were utilized to constrain the subsequent decompression path. A non‐fractionated isochemical phase diagram for the assemblage phengite–garnet–biotite–plagioclase–quartz–melt documents a restricted (M3) P–T stability field centred on 12.5 ± 0.5 kbar and 690 ± 25 °C. A second non‐fractionated isochemical phase diagram calculated for the lower pressure assemblage garnet–cordierite–sillimanite–biotite–plagioclase–quartz–melt (M4) documents a narrow P–T stability field ranging between 7–8.4 kbar and 705–755 °C, which is consistent with independent multiequilibria P–T determinations. Th–Pb SHRIMP dating of monazite cores surrounded by allanite rims is interpreted to constrain the timing of the M4 equilibration to 45.3 ± 1.1 Ma. Coherently linking metamorphic conditions with petrographically constrained ages at Tso Morari provides an integrated context within which previously published petrological or geochronological results can be evaluated. 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Geol.</title><idno type="pISSN">0263-4929</idno><idno type="eISSN">1525-1314</idno><idno type="DOI">10.1111/(ISSN)1525-1314</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2013-06"></date><biblScope unit="volume">31</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="469">469</biblScope><biblScope unit="page" to="504">504</biblScope></imprint></monogr><idno type="istex">47C2DFC43EEFE783C81AA94B79115CBD2C4AB157</idno><idno type="DOI">10.1111/jmg.12030</idno><idno type="ArticleID">JMG12030</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2013-01-05</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>Northward subduction of the leading edge of the Indian continental margin to depths greater than 100 km during the early Eocene resulted in high‐pressure (HP) quartz‐eclogite to ultrahigh‐pressure (UHP) coesite–eclogite metamorphism at Tso Morari, Ladakh Himalaya, India. Integrated pressure–temperature–time determinations within petrographically well‐constrained settings for zircon‐ and/or monazite‐bearing assemblages in mafic eclogite boudins and host aluminous gneisses at Tso Morari uniquely document segments of both the prograde burial and retrograde exhumation path for HP/UHP units in this portion of the western Himalaya. Poikiloblastic cores and inclusion‐poor rims of compositionally zoned garnet in mafic eclogite were utilized with entrapped inclusions and matrix minerals for thermobarometric calculations and isochemical phase diagram construction, the latter thermodynamic modelling performed with and without the consideration of cation fractionation into garnet during prograde metamorphism. Analysis of the garnet cores document (M1) conditions of 21.5 ± 1.5 kbar and 535 ± 15 °C during early garnet growth and re‐equilibration. Sensitive high resolution ion microprobe (SHRIMP) U–Pb analysis of zircon inclusions in garnet cores yields a maximum age determination of 58.0 ± 2.2 Ma for M1. Peak HP/UHP (M2) conditions are constrained at 25.5–27.5 kbar and 630–645 °C using the assemblage garnet rim–omphacite–rutile–phengite–lawsonite–talc–quartz (coesite), with mineral compositional data and regional considerations consistent with the upper P–T bracket. A SHRIMP U–Pb age determination of 50.8 ± 1.4 Ma for HP/UHP metamorphism is given by M2 zircons analysed in the eclogitic matrix and that are encased in the garnet rim. Two garnet‐bearing assemblages from the Puga gneiss (host to the mafic eclogites) were utilized to constrain the subsequent decompression path. A non‐fractionated isochemical phase diagram for the assemblage phengite–garnet–biotite–plagioclase–quartz–melt documents a restricted (M3) P–T stability field centred on 12.5 ± 0.5 kbar and 690 ± 25 °C. A second non‐fractionated isochemical phase diagram calculated for the lower pressure assemblage garnet–cordierite–sillimanite–biotite–plagioclase–quartz–melt (M4) documents a narrow P–T stability field ranging between 7–8.4 kbar and 705–755 °C, which is consistent with independent multiequilibria P–T determinations. Th–Pb SHRIMP dating of monazite cores surrounded by allanite rims is interpreted to constrain the timing of the M4 equilibration to 45.3 ± 1.1 Ma. Coherently linking metamorphic conditions with petrographically constrained ages at Tso Morari provides an integrated context within which previously published petrological or geochronological results can be evaluated. The new composite path is similar to those published for the Kaghan UHP locality in northern Pakistan, although the calculated 12‐mm a−1 rate of post‐pressure peak decompression at Tso Morari would appear less extreme.</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>North Himalayan domes</term></item><item><term>pressure–temperature–time path</term></item><item><term>Tso Morari</term></item><item><term>UHP</term></item><item><term>zircon</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>article-category</head><item><term>Original Article</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2012-08-07">Received</change><change when="2012-12-21">Registration</change><change when="2013-01-05">Created</change><change when="2013-06">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api-v5.istex.fr/document/47C2DFC43EEFE783C81AA94B79115CBD2C4AB157/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:id="jmg12030" xml:lang="en"><header><publicationMeta level="product"><doi origin="wiley" registered="yes">10.1111/(ISSN)1525-1314</doi><issn type="print">0263-4929</issn><issn type="electronic">1525-1314</issn><idGroup><id type="product" value="JMG"></id></idGroup><titleGroup><title sort="JOURNAL OF METAMORPHIC GEOLOGY" type="main">Journal of Metamorphic Geology</title><title type="short">J. Meta. Geol.</title></titleGroup></publicationMeta><publicationMeta level="part" position="06105"><doi origin="wiley">10.1111/jmg.2013.31.issue-5</doi><copyright ownership="publisher">Copyright © 2013 John Wiley & Sons Ltd</copyright><numberingGroup><numbering type="journalVolume" number="31">31</numbering><numbering type="journalIssue">5</numbering></numberingGroup><coverDate startDate="2013-06">June 2013</coverDate></publicationMeta><publicationMeta level="unit" position="10" status="forIssue" type="article"><doi>10.1111/jmg.12030</doi><idGroup><id type="unit" value="JMG12030"></id></idGroup><countGroup><count number="36" type="pageTotal"></count></countGroup><titleGroup><title type="articleCategory">Original Article</title><title type="tocHeading1">Original Articles</title></titleGroup><copyright ownership="publisher">© 2012 John Wiley & Sons Ltd</copyright><eventGroup><event date="2012-08-07" type="manuscriptReceived"></event><event date="2012-12-21" type="manuscriptAccepted"></event><event agent="SPS" date="2013-01-05" type="xmlCreated"></event><event agent="SPS" date="2013-05-31" type="xmlCorrected"></event><event type="publishedOnlineAccepted" date="2012-12-28"></event><event type="publishedOnlineEarlyUnpaginated" date="2013-03-04"></event><event type="firstOnline" date="2013-03-04"></event><event type="publishedOnlineFinalForm" date="2013-06-04"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-31"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.6.4 mode:FullText" date="2015-10-02"></event></eventGroup><numberingGroup><numbering type="pageFirst">469</numbering><numbering type="pageLast">504</numbering></numberingGroup><linkGroup><link type="toTypesetVersion" href="file:JMG.JMG12030.pdf"></link></linkGroup></publicationMeta><contentMeta><titleGroup><title type="main">Integrated pressure–temperature–time constraints for the <fc>T</fc>so <fc>M</fc>orari dome (<fc>N</fc>orthwest <fc>I</fc>ndia): implications for the burial and exhumation path of <fc>UHP</fc> units in the western <fc>H</fc>imalaya</title><title type="shortAuthors">M. R. St‐Onge <i>et al</i>.</title></titleGroup><creators><creator affiliationRef="#jmg12030-aff-0001" creatorRole="author" xml:id="jmg12030-cr-0001"><personName><givenNames>M. R.</givenNames> <familyName>St‐Onge</familyName></personName><contactDetails><email>mstonge@nrcan.gc.ca</email></contactDetails></creator><creator affiliationRef="#jmg12030-aff-0001" creatorRole="author" xml:id="jmg12030-cr-0002"><personName><givenNames>N.</givenNames> <familyName>Rayner</familyName></personName></creator><creator affiliationRef="#jmg12030-aff-0002" creatorRole="author" xml:id="jmg12030-cr-0003"><personName><givenNames>R. M.</givenNames> <familyName>Palin</familyName></personName></creator><creator affiliationRef="#jmg12030-aff-0002" creatorRole="author" xml:id="jmg12030-cr-0004"><personName><givenNames>M. P.</givenNames> <familyName>Searle</familyName></personName></creator><creator affiliationRef="#jmg12030-aff-0002" creatorRole="author" xml:id="jmg12030-cr-0005"><personName><givenNames>D. J.</givenNames> <familyName>Waters</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="CA" type="organization" xml:id="jmg12030-aff-0001"><orgName>Geological Survey of Canada</orgName> <address><street>601 Booth St.</street> <city>Ottawa</city> <countryPart>ON</countryPart> <postCode>K1A 0E8</postCode> <country>Canada</country></address></affiliation><affiliation countryCode="GB" type="organization" xml:id="jmg12030-aff-0002"><orgDiv>Department of Earth Sciences</orgDiv> <orgName>University of Oxford</orgName> <address><street>South Parks Road</street> <city>Oxford</city> <postCode>OX1 3AN</postCode> <country>UK</country></address></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="jmg12030-kwd-0001"><fc>N</fc>orth <fc>H</fc>imalayan domes</keyword><keyword xml:id="jmg12030-kwd-0002">pressure–temperature–time path</keyword><keyword xml:id="jmg12030-kwd-0003"><fc>T</fc>so <fc>M</fc>orari</keyword><keyword xml:id="jmg12030-kwd-0004"><fc>UHP</fc></keyword><keyword xml:id="jmg12030-kwd-0005">zircon</keyword></keywordGroup><abstractGroup><abstract type="main" xml:id="jmg12030-abs-0001"><title type="main">Abstract</title><p>Northward subduction of the leading edge of the <fc>I</fc>ndian continental margin to depths greater than 100 km during the early Eocene resulted in high‐pressure (<fc>HP</fc>) quartz‐eclogite to ultrahigh‐pressure (<fc>UHP</fc>) coesite–eclogite metamorphism at <fc>T</fc>so <fc>M</fc>orari, <fc>L</fc>adakh <fc>H</fc>imalaya, <fc>I</fc>ndia. Integrated pressure–temperature–time determinations within petrographically well‐constrained settings for zircon‐ and/or monazite‐bearing assemblages in mafic eclogite boudins and host aluminous gneisses at <fc>T</fc>so <fc>M</fc>orari uniquely document segments of <i>both</i> the prograde burial and retrograde exhumation path for <fc>HP</fc>/<fc>UHP</fc> units in this portion of the western <fc>H</fc>imalaya. Poikiloblastic cores and inclusion‐poor rims of compositionally zoned garnet in mafic eclogite were utilized with entrapped inclusions and matrix minerals for thermobarometric calculations and isochemical phase diagram construction, the latter thermodynamic modelling performed with and without the consideration of cation fractionation into garnet during prograde metamorphism. Analysis of the garnet cores document (<fc>M</fc>1) conditions of 21.5 ± 1.5 kbar and 535 <i>±</i> 15 °C during early garnet growth and re‐equilibration. Sensitive high resolution ion microprobe (<fc>SHRIMP</fc>) <fc><fr>U</fr></fc>–<fc><fr>Pb</fr></fc> analysis of zircon inclusions in garnet cores yields a maximum age determination of 58.0 <i>±</i> 2.2 Ma for <fc>M</fc>1. Peak <fc>HP</fc>/<fc>UHP</fc> (<fc>M</fc>2) conditions are constrained at 25.5–27.5 kbar and 630–645 °C using the assemblage garnet rim–omphacite–rutile–phengite–lawsonite–talc–quartz (coesite), with mineral compositional data and regional considerations consistent with the upper <i>P</i>–<i>T</i> bracket. A <fc>SHRIMP <fr>U</fr></fc>–<fc><fr>Pb</fr></fc> age determination of 50.8 <i>±</i> 1.4 Ma for <fc>HP</fc>/<fc>UHP</fc> metamorphism is given by <fc>M</fc>2 zircons analysed in the eclogitic matrix and that are encased in the garnet rim. Two garnet‐bearing assemblages from the <fc>P</fc>uga gneiss (host to the mafic eclogites) were utilized to constrain the subsequent decompression path. A non‐fractionated isochemical phase diagram for the assemblage phengite–garnet–biotite–plagioclase–quartz–melt documents a restricted (<fc>M</fc>3) <i>P–T</i> stability field centred on 12.5 <i>±</i> 0.5 kbar and 690 <i>±</i> 25 °C. A second non‐fractionated isochemical phase diagram calculated for the lower pressure assemblage garnet–cordierite–sillimanite–biotite–plagioclase–quartz–melt (<fc>M</fc>4) documents a narrow <i>P–T</i> stability field ranging between 7–8.4 kbar and 705–755 °C, which is consistent with independent multiequilibria <i>P</i>–<i>T</i> determinations. Th–Pb <fc>SHRIMP</fc> dating of monazite cores surrounded by allanite rims is interpreted to constrain the timing of the <fc>M</fc>4 equilibration to 45.3 <i>±</i> 1.1 Ma. Coherently linking metamorphic conditions with petrographically constrained ages at <fc>T</fc>so <fc>M</fc>orari provides an integrated context within which previously published petrological or geochronological results can be evaluated. The new composite path is similar to those published for the <fc>K</fc>aghan <fc>UHP</fc> locality in northern Pakistan, although the calculated 12‐mm a<sup>−1</sup> rate of post‐pressure peak decompression at <fc>T</fc>so <fc>M</fc>orari would appear less extreme.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Integrated pressure–temperature–time constraints for the Tso Morari dome (Northwest India): implications for the burial and exhumation path of UHP units in the western Himalaya</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Integrated pressure–temperature–time constraints for the Tso Morari dome (Northwest India): implications for the burial and exhumation path of UHP units in the western Himalaya</title></titleInfo><name type="personal"><namePart type="given">M. R.</namePart><namePart type="family">St‐Onge</namePart><affiliation>Geological Survey of Canada, 601 Booth St., ON, K1A 0E8, Ottawa, Canada</affiliation><affiliation>E-mail: mstonge@nrcan.gc.ca</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">N.</namePart><namePart type="family">Rayner</namePart><affiliation>Geological Survey of Canada, 601 Booth St., ON, K1A 0E8, Ottawa, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R. M.</namePart><namePart type="family">Palin</namePart><affiliation>Department of Earth Sciences, University of Oxford, South Parks Road, OX1 3AN, Oxford, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M. P.</namePart><namePart type="family">Searle</namePart><affiliation>Department of Earth Sciences, University of Oxford, South Parks Road, OX1 3AN, Oxford, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D. J.</namePart><namePart type="family">Waters</namePart><affiliation>Department of Earth Sciences, University of Oxford, South Parks Road, OX1 3AN, 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">2013-06</dateIssued><dateCreated encoding="w3cdtf">2013-01-05</dateCreated><dateCaptured encoding="w3cdtf">2012-08-07</dateCaptured><dateValid encoding="w3cdtf">2012-12-21</dateValid><copyrightDate encoding="w3cdtf">2013</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>Northward subduction of the leading edge of the Indian continental margin to depths greater than 100 km during the early Eocene resulted in high‐pressure (HP) quartz‐eclogite to ultrahigh‐pressure (UHP) coesite–eclogite metamorphism at Tso Morari, Ladakh Himalaya, India. Integrated pressure–temperature–time determinations within petrographically well‐constrained settings for zircon‐ and/or monazite‐bearing assemblages in mafic eclogite boudins and host aluminous gneisses at Tso Morari uniquely document segments of both the prograde burial and retrograde exhumation path for HP/UHP units in this portion of the western Himalaya. Poikiloblastic cores and inclusion‐poor rims of compositionally zoned garnet in mafic eclogite were utilized with entrapped inclusions and matrix minerals for thermobarometric calculations and isochemical phase diagram construction, the latter thermodynamic modelling performed with and without the consideration of cation fractionation into garnet during prograde metamorphism. Analysis of the garnet cores document (M1) conditions of 21.5 ± 1.5 kbar and 535 ± 15 °C during early garnet growth and re‐equilibration. Sensitive high resolution ion microprobe (SHRIMP) U–Pb analysis of zircon inclusions in garnet cores yields a maximum age determination of 58.0 ± 2.2 Ma for M1. Peak HP/UHP (M2) conditions are constrained at 25.5–27.5 kbar and 630–645 °C using the assemblage garnet rim–omphacite–rutile–phengite–lawsonite–talc–quartz (coesite), with mineral compositional data and regional considerations consistent with the upper P–T bracket. A SHRIMP U–Pb age determination of 50.8 ± 1.4 Ma for HP/UHP metamorphism is given by M2 zircons analysed in the eclogitic matrix and that are encased in the garnet rim. Two garnet‐bearing assemblages from the Puga gneiss (host to the mafic eclogites) were utilized to constrain the subsequent decompression path. A non‐fractionated isochemical phase diagram for the assemblage phengite–garnet–biotite–plagioclase–quartz–melt documents a restricted (M3) P–T stability field centred on 12.5 ± 0.5 kbar and 690 ± 25 °C. A second non‐fractionated isochemical phase diagram calculated for the lower pressure assemblage garnet–cordierite–sillimanite–biotite–plagioclase–quartz–melt (M4) documents a narrow P–T stability field ranging between 7–8.4 kbar and 705–755 °C, which is consistent with independent multiequilibria P–T determinations. Th–Pb SHRIMP dating of monazite cores surrounded by allanite rims is interpreted to constrain the timing of the M4 equilibration to 45.3 ± 1.1 Ma. Coherently linking metamorphic conditions with petrographically constrained ages at Tso Morari provides an integrated context within which previously published petrological or geochronological results can be evaluated. The new composite path is similar to those published for the Kaghan UHP locality in northern Pakistan, although the calculated 12‐mm a−1 rate of post‐pressure peak decompression at Tso Morari would appear less extreme.</abstract><subject><genre>keywords</genre><topic>North Himalayan domes</topic><topic>pressure–temperature–time path</topic><topic>Tso Morari</topic><topic>UHP</topic><topic>zircon</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Metamorphic Geology</title></titleInfo><titleInfo type="abbreviated"><title>J. Meta. Geol.</title></titleInfo><genre type="journal">journal</genre><subject><genre>article-category</genre><topic>Original Article</topic></subject><identifier type="ISSN">0263-4929</identifier><identifier type="eISSN">1525-1314</identifier><identifier type="DOI">10.1111/(ISSN)1525-1314</identifier><identifier type="PublisherID">JMG</identifier><part><date>2013</date><detail type="volume"><caption>vol.</caption><number>31</number></detail><detail type="issue"><caption>no.</caption><number>5</number></detail><extent unit="pages"><start>469</start><end>504</end><total>36</total></extent></part></relatedItem><identifier type="istex">47C2DFC43EEFE783C81AA94B79115CBD2C4AB157</identifier><identifier type="DOI">10.1111/jmg.12030</identifier><identifier type="ArticleID">JMG12030</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright © 2013 John Wiley & Sons Ltd© 2012 John Wiley & Sons Ltd</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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