Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada
Identifieur interne : 001E41 ( Istex/Corpus ); précédent : 001E40; suivant : 001E42Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada
Auteurs : Christopher L. Andronicos ; Dominique H. Chardon ; Lincoln S. Hollister ; George E. Gehrels ; Glenn J. WoodsworthSource :
- Tectonics [ 0278-7407 ] ; 2003-04.
Abstract
We describe the crustal structure of the Coast Mountains batholith between 54° and 55°N, within the Canadian Cordillera, with emphasis on emplacement of the 7 km thick Kasiks sill complex (KSC). Kinematic patterns that developed during emplacement of the KSC are the result of interactions between magma transport, magma accumulation and regional deformation. The sills were emplaced during NW directed normal shearing and flattening of country rocks that host the KSC. A ∼2 km thick shallowly NE dipping mylonite zone cuts the eastern side of the KSC. Kinematic indicators within the mylonite zone record top to the east normal displacements. Structural analysis shows that mylonite formation occurred during subvertical shortening and east‐northeast, subhorizontal extension. U/Pb zircon age dates show that ENE directed normal shearing along the eastern side of the KSC and WNW directed normal shearing within the KSC occurred contemporaneously between ∼54 and 51 Ma, indicating strong strain partitioning between the mylonite and the KSC. This pattern of strain partitioning is interpreted to have been driven by return flow of melt‐laden crust in response to tectonic denudation of the upper crust. Seismic profiling shows that many of these structures extend to mid and lower crustal depths. Comparison of our results with other regions within the Canadian Cordillera indicates that orogen‐scale right‐lateral strike‐slip faults deformed synchronously with wide spread magmatism and formation of extensional gneiss domes. Thus the crustal structure of the Coast Mountains batholith was the result of early Tertiary batholith construction during dextral oblique convergence and synorogenic collapse.
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DOI: 10.1029/2001TC001312
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Chardon</name><affiliation><mods:affiliation>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>European Centre for Research in Environmental Geosciences, CNRS, Université Aix‐Marseille III, Aix‐en‐Provence, France</mods:affiliation></affiliation></author><author><name sortKey="Hollister, Lincoln S" sort="Hollister, Lincoln S" uniqKey="Hollister L" first="Lincoln S." last="Hollister">Lincoln S. Hollister</name><affiliation><mods:affiliation>Department of Geosciences, Princeton University, New Jersey, Princeton, USA</mods:affiliation></affiliation></author><author><name sortKey="Gehrels, George E" sort="Gehrels, George E" uniqKey="Gehrels G" first="George E." last="Gehrels">George E. Gehrels</name><affiliation><mods:affiliation>Department of Geosciences, University of Arizona, Arizona, Tucson, USA</mods:affiliation></affiliation></author><author><name sortKey="Woodsworth, Glenn J" sort="Woodsworth, Glenn J" uniqKey="Woodsworth G" first="Glenn J." last="Woodsworth">Glenn J. 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Andronicos</name><affiliation><mods:affiliation>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Geological Sciences, University of Texas at El Paso, Texas, El Paso, USA</mods:affiliation></affiliation></author><author><name sortKey="Chardon, Dominique H" sort="Chardon, Dominique H" uniqKey="Chardon D" first="Dominique H." last="Chardon">Dominique H. Chardon</name><affiliation><mods:affiliation>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>European Centre for Research in Environmental Geosciences, CNRS, Université Aix‐Marseille III, Aix‐en‐Provence, France</mods:affiliation></affiliation></author><author><name sortKey="Hollister, Lincoln S" sort="Hollister, Lincoln S" uniqKey="Hollister L" first="Lincoln S." last="Hollister">Lincoln S. Hollister</name><affiliation><mods:affiliation>Department of Geosciences, Princeton University, New Jersey, Princeton, USA</mods:affiliation></affiliation></author><author><name sortKey="Gehrels, George E" sort="Gehrels, George E" uniqKey="Gehrels G" first="George E." last="Gehrels">George E. Gehrels</name><affiliation><mods:affiliation>Department of Geosciences, University of Arizona, Arizona, Tucson, USA</mods:affiliation></affiliation></author><author><name sortKey="Woodsworth, Glenn J" sort="Woodsworth, Glenn J" uniqKey="Woodsworth G" first="Glenn J." last="Woodsworth">Glenn J. Woodsworth</name><affiliation><mods:affiliation>Geological Survey of Canada, British Columbia, Vancouver, Canada</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="2003-04">2003-04</date><biblScope unit="volume">22</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0278-7407</idno></series><idno type="istex">331C855A61CDBAB379C04E5FBAA4C4BC196511B3</idno><idno type="DOI">10.1029/2001TC001312</idno><idno type="ArticleID">2001TC001312</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">We describe the crustal structure of the Coast Mountains batholith between 54° and 55°N, within the Canadian Cordillera, with emphasis on emplacement of the 7 km thick Kasiks sill complex (KSC). Kinematic patterns that developed during emplacement of the KSC are the result of interactions between magma transport, magma accumulation and regional deformation. The sills were emplaced during NW directed normal shearing and flattening of country rocks that host the KSC. A ∼2 km thick shallowly NE dipping mylonite zone cuts the eastern side of the KSC. Kinematic indicators within the mylonite zone record top to the east normal displacements. Structural analysis shows that mylonite formation occurred during subvertical shortening and east‐northeast, subhorizontal extension. U/Pb zircon age dates show that ENE directed normal shearing along the eastern side of the KSC and WNW directed normal shearing within the KSC occurred contemporaneously between ∼54 and 51 Ma, indicating strong strain partitioning between the mylonite and the KSC. This pattern of strain partitioning is interpreted to have been driven by return flow of melt‐laden crust in response to tectonic denudation of the upper crust. Seismic profiling shows that many of these structures extend to mid and lower crustal depths. Comparison of our results with other regions within the Canadian Cordillera indicates that orogen‐scale right‐lateral strike‐slip faults deformed synchronously with wide spread magmatism and formation of extensional gneiss domes. Thus the crustal structure of the Coast Mountains batholith was the result of early Tertiary batholith construction during dextral oblique convergence and synorogenic collapse.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Christopher L. Andronicos</name><affiliations><json:string>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</json:string><json:string>Department of Geological Sciences, University of Texas at El Paso, Texas, El Paso, USA</json:string></affiliations></json:item><json:item><name>Dominique H. Chardon</name><affiliations><json:string>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</json:string><json:string>European Centre for Research in Environmental Geosciences, CNRS, Université Aix‐Marseille III, Aix‐en‐Provence, France</json:string></affiliations></json:item><json:item><name>Lincoln S. Hollister</name><affiliations><json:string>Department of Geosciences, Princeton University, New Jersey, Princeton, USA</json:string></affiliations></json:item><json:item><name>George E. Gehrels</name><affiliations><json:string>Department of Geosciences, University of Arizona, Arizona, Tucson, USA</json:string></affiliations></json:item><json:item><name>Glenn J. Woodsworth</name><affiliations><json:string>Geological Survey of Canada, British Columbia, Vancouver, Canada</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>extension</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>plutonism</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Canada</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>exhumation</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>tectonics</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>transtension</value></json:item></subject><articleId><json:string>2001TC001312</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>We describe the crustal structure of the Coast Mountains batholith between 54° and 55°N, within the Canadian Cordillera, with emphasis on emplacement of the 7 km thick Kasiks sill complex (KSC). Kinematic patterns that developed during emplacement of the KSC are the result of interactions between magma transport, magma accumulation and regional deformation. The sills were emplaced during NW directed normal shearing and flattening of country rocks that host the KSC. A ∼2 km thick shallowly NE dipping mylonite zone cuts the eastern side of the KSC. Kinematic indicators within the mylonite zone record top to the east normal displacements. Structural analysis shows that mylonite formation occurred during subvertical shortening and east‐northeast, subhorizontal extension. U/Pb zircon age dates show that ENE directed normal shearing along the eastern side of the KSC and WNW directed normal shearing within the KSC occurred contemporaneously between ∼54 and 51 Ma, indicating strong strain partitioning between the mylonite and the KSC. This pattern of strain partitioning is interpreted to have been driven by return flow of melt‐laden crust in response to tectonic denudation of the upper crust. Seismic profiling shows that many of these structures extend to mid and lower crustal depths. Comparison of our results with other regions within the Canadian Cordillera indicates that orogen‐scale right‐lateral strike‐slip faults deformed synchronously with wide spread magmatism and formation of extensional gneiss domes. Thus the crustal structure of the Coast Mountains batholith was the result of early Tertiary batholith construction during dextral oblique convergence and synorogenic collapse.</abstract><qualityIndicators><score>8</score><pdfVersion>1.3</pdfVersion><pdfPageSize>612 x 792 pts (letter)</pdfPageSize><refBibsNative>true</refBibsNative><abstractCharCount>1704</abstractCharCount><pdfWordCount>12518</pdfWordCount><pdfCharCount>78168</pdfCharCount><pdfPageCount>24</pdfPageCount><abstractWordCount>250</abstractWordCount></qualityIndicators><title>Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada</title><refBibs><json:item><host><author></author><title>The Dynamics of Faulting and Dyke Formation With Applications to Britain</title></host></json:item><json:item><author><json:item><name>C. L. Andronicos</name></json:item><json:item><name>L. S. Hollister</name></json:item><json:item><name>C. 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Open File Rep., 1136</title></host></json:item></refBibs><genre><json:string>article</json:string></genre><host><volume>22</volume><publisherId><json:string>TECT</json:string></publisherId><pages><total>24</total><last>n/a</last><first>n/a</first></pages><issn><json:string>0278-7407</json:string></issn><issue>2</issue><subject><json:item><value>TECTONOPHYSICS</value></json:item><json:item><value>Continental contractional orogenic belts and inversion tectonics</value></json:item><json:item><value>GEOGRAPHIC LOCATION</value></json:item><json:item><value>Information Related to Geographic Region: North America</value></json:item><json:item><value>INFORMATION RELATED TO GEOLOGIC 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geophysics</json:string></scienceMetrix></categories><publicationDate>2003</publicationDate><copyrightDate>2003</copyrightDate><doi><json:string>10.1029/2001TC001312</json:string></doi><id>331C855A61CDBAB379C04E5FBAA4C4BC196511B3</id><score>0.08711846</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/331C855A61CDBAB379C04E5FBAA4C4BC196511B3/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/331C855A61CDBAB379C04E5FBAA4C4BC196511B3/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/331C855A61CDBAB379C04E5FBAA4C4BC196511B3/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Publishing Ltd</publisher><availability><p>Copyright 2003 by the American Geophysical Union.</p></availability><date>2003</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada</title><author xml:id="author-1"><persName><forename type="first">Christopher L.</forename><surname>Andronicos</surname></persName><affiliation>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</affiliation><affiliation>Department of Geological Sciences, University of Texas at El Paso, Texas, El Paso, USA</affiliation></author><author xml:id="author-2"><persName><forename type="first">Dominique H.</forename><surname>Chardon</surname></persName><affiliation>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</affiliation><affiliation>European Centre for Research in Environmental Geosciences, CNRS, Université Aix‐Marseille III, Aix‐en‐Provence, France</affiliation></author><author xml:id="author-3"><persName><forename type="first">Lincoln S.</forename><surname>Hollister</surname></persName><affiliation>Department of Geosciences, Princeton University, New Jersey, Princeton, USA</affiliation></author><author xml:id="author-4"><persName><forename type="first">George E.</forename><surname>Gehrels</surname></persName><affiliation>Department of Geosciences, University of Arizona, Arizona, Tucson, USA</affiliation></author><author xml:id="author-5"><persName><forename type="first">Glenn J.</forename><surname>Woodsworth</surname></persName><affiliation>Geological Survey of Canada, British Columbia, Vancouver, Canada</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="2003-04"></date><biblScope unit="volume">22</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint></monogr><idno type="istex">331C855A61CDBAB379C04E5FBAA4C4BC196511B3</idno><idno type="DOI">10.1029/2001TC001312</idno><idno type="ArticleID">2001TC001312</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2003</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>We describe the crustal structure of the Coast Mountains batholith between 54° and 55°N, within the Canadian Cordillera, with emphasis on emplacement of the 7 km thick Kasiks sill complex (KSC). Kinematic patterns that developed during emplacement of the KSC are the result of interactions between magma transport, magma accumulation and regional deformation. The sills were emplaced during NW directed normal shearing and flattening of country rocks that host the KSC. A ∼2 km thick shallowly NE dipping mylonite zone cuts the eastern side of the KSC. Kinematic indicators within the mylonite zone record top to the east normal displacements. Structural analysis shows that mylonite formation occurred during subvertical shortening and east‐northeast, subhorizontal extension. U/Pb zircon age dates show that ENE directed normal shearing along the eastern side of the KSC and WNW directed normal shearing within the KSC occurred contemporaneously between ∼54 and 51 Ma, indicating strong strain partitioning between the mylonite and the KSC. This pattern of strain partitioning is interpreted to have been driven by return flow of melt‐laden crust in response to tectonic denudation of the upper crust. Seismic profiling shows that many of these structures extend to mid and lower crustal depths. Comparison of our results with other regions within the Canadian Cordillera indicates that orogen‐scale right‐lateral strike‐slip faults deformed synchronously with wide spread magmatism and formation of extensional gneiss domes. Thus the crustal structure of the Coast Mountains batholith was the result of early Tertiary batholith construction during dextral oblique convergence and synorogenic collapse.</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>extension</term></item><item><term>plutonism</term></item><item><term>Canada</term></item><item><term>exhumation</term></item><item><term>tectonics</term></item><item><term>transtension</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>TECTONOPHYSICS</term></item><item><term>Continental contractional orogenic belts and inversion tectonics</term></item><item><term>GEOGRAPHIC LOCATION</term></item><item><term>Information Related to Geographic Region: North America</term></item><item><term>INFORMATION RELATED TO GEOLOGIC TIME</term></item><item><term>Cenozoic</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2001-06-28">Received</change><change when="2002-09-16">Registration</change><change when="2003-04">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/331C855A61CDBAB379C04E5FBAA4C4BC196511B3/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="tect1458"><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="20"><doi>10.1002/tect.v22.2</doi><numberingGroup><numbering type="journalVolume" number="22">22</numbering><numbering type="journalIssue">2</numbering></numberingGroup><coverDate startDate="2003-04">April 2003</coverDate></publicationMeta><publicationMeta level="unit" position="60" type="article" status="forIssue"><doi>10.1029/2001TC001312</doi><idGroup><id type="editorialOffice" value="2001TC001312"></id><id type="society" value="1012"></id><id type="unit" value="TECT1458"></id></idGroup><countGroup><count type="pageTotal" number="24"></count></countGroup><copyright ownership="thirdParty">Copyright 2003 by the American Geophysical Union.</copyright><eventGroup><event type="manuscriptReceived" date="2001-06-28"></event><event type="manuscriptRevised" date="2002-08-02"></event><event type="manuscriptAccepted" date="2002-09-16"></event><event type="firstOnline" date="2003-04-15"></event><event type="publishedOnlineFinalForm" date="2003-04-15"></event><event type="xmlConverted" agent="SPi Global Converter:AGUv3.42_TO_WileyML3Gv1.0.3 version:1.2; AGU2WileyML3G Final Clean Up v1.0; WileyML 3G Packaging Tool v1.0" date="2012-12-17"></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/taxonomy5/8100">TECTONOPHYSICS</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/8102">Continental contractional orogenic belts and inversion tectonics</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/9300">GEOGRAPHIC LOCATION</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/9350">Information Related to Geographic Region: North America</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/9600">INFORMATION RELATED TO GEOLOGIC TIME</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/9604">Cenozoic</subject></subjectInfo></subjectInfo><selfCitationGroup><citation xml:id="tect1458-cit-0000" type="self"><author><familyName>Andronicos</familyName>, <givenNames>C. L.</givenNames></author>, <author><givenNames>D. H.</givenNames> <familyName>Chardon</familyName></author>, <author><givenNames>L. S.</givenNames> <familyName>Hollister</familyName></author>, <author><givenNames>G. E.</givenNames> <familyName>Gehrels</familyName></author>, and <author><givenNames>G. J.</givenNames> <familyName>Woodsworth</familyName></author> (<pubYear year="2003">2003</pubYear>), <articleTitle>Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada</articleTitle>, <journalTitle>Tectonics</journalTitle>, <vol>22</vol>, 1012, doi:<accessionId ref="info:doi/10.1029/2001TC001312">10.1029/2001TC001312</accessionId>, <issue>2</issue>.</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:TECT.TECT1458.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="14"></count><count type="tableTotal" number="2"></count></countGroup><titleGroup><title type="main">Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada</title><title type="short">EXTENSION IN THE COAST PLUTONIC COMPLEX</title><title type="shortAuthors">Andronicos <i>et al</i>.</title></titleGroup><creators><creator creatorRole="author" xml:id="tect1458-cr-0001" affiliationRef="#tect1458-aff-0001 #tect1458-aff-0004"><personName><givenNames>Christopher L.</givenNames> <familyName>Andronicos</familyName></personName></creator><creator creatorRole="author" xml:id="tect1458-cr-0002" affiliationRef="#tect1458-aff-0001 #tect1458-aff-0005"><personName><givenNames>Dominique H.</givenNames> <familyName>Chardon</familyName></personName></creator><creator creatorRole="author" xml:id="tect1458-cr-0003" affiliationRef="#tect1458-aff-0001"><personName><givenNames>Lincoln S.</givenNames> <familyName>Hollister</familyName></personName></creator><creator creatorRole="author" xml:id="tect1458-cr-0004" affiliationRef="#tect1458-aff-0002"><personName><givenNames>George E.</givenNames> <familyName>Gehrels</familyName></personName></creator><creator creatorRole="author" xml:id="tect1458-cr-0005" affiliationRef="#tect1458-aff-0003"><personName><givenNames>Glenn J.</givenNames> <familyName>Woodsworth</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="US" type="organization" xml:id="tect1458-aff-0001"><orgDiv>Department of Geosciences</orgDiv><orgName>Princeton University</orgName><address><city>Princeton</city><countryPart>New Jersey</countryPart><country>USA</country></address></affiliation><affiliation countryCode="US" type="organization" xml:id="tect1458-aff-0002"><orgDiv>Department of Geosciences</orgDiv><orgName>University of Arizona</orgName><address><city>Tucson</city><countryPart>Arizona</countryPart><country>USA</country></address></affiliation><affiliation countryCode="CA" type="organization" xml:id="tect1458-aff-0003"><orgName>Geological Survey of Canada</orgName><address><city>Vancouver</city><countryPart>British Columbia</countryPart><country>Canada</country></address></affiliation><affiliation countryCode="US" type="organization" xml:id="tect1458-aff-0004"><orgDiv>Department of Geological Sciences</orgDiv><orgName>University of Texas at El Paso</orgName><address><city>El Paso</city><countryPart>Texas</countryPart><country>USA</country></address></affiliation><affiliation countryCode="FR" type="organization" xml:id="tect1458-aff-0005"><orgDiv>European Centre for Research in Environmental Geosciences, CNRS</orgDiv><orgName>Université Aix‐Marseille III</orgName><address><city>Aix‐en‐Provence</city><country>France</country></address></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="tect1458-kwd-0001">extension</keyword><keyword xml:id="tect1458-kwd-0002">plutonism</keyword><keyword xml:id="tect1458-kwd-0003">Canada</keyword><keyword xml:id="tect1458-kwd-0004">exhumation</keyword><keyword xml:id="tect1458-kwd-0005">tectonics</keyword><keyword xml:id="tect1458-kwd-0006">transtension</keyword></keywordGroup><abstractGroup><abstract type="main"><p xml:id="tect1458-para-0001" label="1">We describe the crustal structure of the Coast Mountains batholith between 54° and 55°N, within the Canadian Cordillera, with emphasis on emplacement of the 7 km thick Kasiks sill complex (KSC). Kinematic patterns that developed during emplacement of the KSC are the result of interactions between magma transport, magma accumulation and regional deformation. The sills were emplaced during NW directed normal shearing and flattening of country rocks that host the KSC. A ∼2 km thick shallowly NE dipping mylonite zone cuts the eastern side of the KSC. Kinematic indicators within the mylonite zone record top to the east normal displacements. Structural analysis shows that mylonite formation occurred during subvertical shortening and east‐northeast, subhorizontal extension. U/Pb zircon age dates show that ENE directed normal shearing along the eastern side of the KSC and WNW directed normal shearing within the KSC occurred contemporaneously between ∼54 and 51 Ma, indicating strong strain partitioning between the mylonite and the KSC. This pattern of strain partitioning is interpreted to have been driven by return flow of melt‐laden crust in response to tectonic denudation of the upper crust. Seismic profiling shows that many of these structures extend to mid and lower crustal depths. Comparison of our results with other regions within the Canadian Cordillera indicates that orogen‐scale right‐lateral strike‐slip faults deformed synchronously with wide spread magmatism and formation of extensional gneiss domes. Thus the crustal structure of the Coast Mountains batholith was the result of early Tertiary batholith construction during dextral oblique convergence and synorogenic collapse.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>EXTENSION IN THE COAST PLUTONIC COMPLEX</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada</title></titleInfo><name type="personal"><namePart type="given">Christopher L.</namePart><namePart type="family">Andronicos</namePart><affiliation>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</affiliation><affiliation>Department of Geological Sciences, University of Texas at El Paso, Texas, El Paso, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Dominique H.</namePart><namePart type="family">Chardon</namePart><affiliation>Department of Geosciences, Princeton University, Princeton, New Jersey, USA</affiliation><affiliation>European Centre for Research in Environmental Geosciences, CNRS, Université Aix‐Marseille III, Aix‐en‐Provence, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Lincoln S.</namePart><namePart type="family">Hollister</namePart><affiliation>Department of Geosciences, Princeton University, New Jersey, Princeton, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">George E.</namePart><namePart type="family">Gehrels</namePart><affiliation>Department of Geosciences, University of Arizona, Arizona, Tucson, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Glenn J.</namePart><namePart type="family">Woodsworth</namePart><affiliation>Geological Survey of Canada, British Columbia, Vancouver, Canada</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">2003-04</dateIssued><dateCaptured encoding="w3cdtf">2001-06-28</dateCaptured><dateValid encoding="w3cdtf">2002-09-16</dateValid><edition>Andronicos, C. L., D. H. Chardon, L. S. Hollister, G. E. Gehrels, and G. J. Woodsworth (2003), Strain partitioning in an obliquely convergent orogen, plutonism, and synorogenic collapse: Coast Mountains Batholith, British Columbia, Canada, Tectonics, 22, 1012, doi:10.1029/2001TC001312, 2.</edition><copyrightDate encoding="w3cdtf">2003</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">14</extent><extent unit="tables">2</extent></physicalDescription><abstract>We describe the crustal structure of the Coast Mountains batholith between 54° and 55°N, within the Canadian Cordillera, with emphasis on emplacement of the 7 km thick Kasiks sill complex (KSC). Kinematic patterns that developed during emplacement of the KSC are the result of interactions between magma transport, magma accumulation and regional deformation. The sills were emplaced during NW directed normal shearing and flattening of country rocks that host the KSC. A ∼2 km thick shallowly NE dipping mylonite zone cuts the eastern side of the KSC. Kinematic indicators within the mylonite zone record top to the east normal displacements. Structural analysis shows that mylonite formation occurred during subvertical shortening and east‐northeast, subhorizontal extension. U/Pb zircon age dates show that ENE directed normal shearing along the eastern side of the KSC and WNW directed normal shearing within the KSC occurred contemporaneously between ∼54 and 51 Ma, indicating strong strain partitioning between the mylonite and the KSC. This pattern of strain partitioning is interpreted to have been driven by return flow of melt‐laden crust in response to tectonic denudation of the upper crust. Seismic profiling shows that many of these structures extend to mid and lower crustal depths. Comparison of our results with other regions within the Canadian Cordillera indicates that orogen‐scale right‐lateral strike‐slip faults deformed synchronously with wide spread magmatism and formation of extensional gneiss domes. Thus the crustal structure of the Coast Mountains batholith was the result of early Tertiary batholith construction during dextral oblique convergence and synorogenic collapse.</abstract><subject><genre>keywords</genre><topic>extension</topic><topic>plutonism</topic><topic>Canada</topic><topic>exhumation</topic><topic>tectonics</topic><topic>transtension</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/taxonomy5/8100">TECTONOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8102">Continental contractional orogenic belts and inversion tectonics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/9300">GEOGRAPHIC LOCATION</topic><topic authorityURI="http://psi.agu.org/taxonomy5/9350">Information Related to Geographic Region: North America</topic><topic authorityURI="http://psi.agu.org/taxonomy5/9600">INFORMATION RELATED TO GEOLOGIC TIME</topic><topic authorityURI="http://psi.agu.org/taxonomy5/9604">Cenozoic</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>2003</date><detail type="volume"><caption>vol.</caption><number>22</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>24</total></extent></part></relatedItem><identifier type="istex">331C855A61CDBAB379C04E5FBAA4C4BC196511B3</identifier><identifier type="DOI">10.1029/2001TC001312</identifier><identifier type="ArticleID">2001TC001312</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2003 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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