Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand
Identifieur interne : 001880 ( Istex/Corpus ); précédent : 001879; suivant : 001881Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand
Auteurs : Jean-Frédéric Lebrun ; Geoffroy Lamarche ; Jean-Yves CollotSource :
- Journal of Geophysical Research: Solid Earth [ 0148-0227 ] ; 2003-09.
Abstract
We first present a synthesis of the Macquarie Ridge Complex (MRC) tectonic structures as well as paleo‐reconstruction models of the kinematic evolution of the Pacific‐Australia plate boundary south of New Zealand, since the Eocene. We then ascertain the geodynamical conditions that preceded subduction initiation, and identify the nature and structures of the crust that first subducted, at the Puysegur subduction zone. This synthesis is used to produce a subduction initiation model for the Puysegur Region. Concomitant to inception of the Alpine Fault (ca. 23 Ma), a 150‐km‐wide transpressive relay zone developed along Puysegur Bank inherited structures, enabling localization of compressive deformation. Right‐lateral motion at the relay zone has juxtaposed oceanic and continental crusts facilitating inception of subduction and controlling the subduction vergence. Subsequently, the Puysegur subduction zone initiated at the transpressive relay zone ca. 20 Ma. Upper and lower plate inherited structures guided and facilitated the lengthening of the subduction zone during the Neogene. The four individual segments of the MRC represent different stages of incipient subduction whose development depends on local geodynamical conditions and lithospheric heterogeneities. The example of the MRC demonstrates that subduction can initiate from an oceanic spreading center, through progressive changes in plate kinematics within a 10–15 Myr time frame.
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DOI: 10.1029/2002JB002041
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand</title><author><name sortKey="Lebrun, Jean Rederic" sort="Lebrun, Jean Rederic" uniqKey="Lebrun J" first="Jean-Frédéric" last="Lebrun">Jean-Frédéric Lebrun</name><affiliation><mods:affiliation>Université des Antilles et de la Guyane, Pointe à Pitre, Guadeloupe (FWI), France</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: jflebrun@univ-ag.fr</mods:affiliation></affiliation></author><author><name sortKey="Lamarche, Geoffroy" sort="Lamarche, Geoffroy" uniqKey="Lamarche G" first="Geoffroy" last="Lamarche">Geoffroy Lamarche</name><affiliation><mods:affiliation>NIWA, Wellington, New Zealand</mods:affiliation></affiliation></author><author><name sortKey="Collot, Jean Ves" sort="Collot, Jean Ves" uniqKey="Collot J" first="Jean-Yves" last="Collot">Jean-Yves Collot</name><affiliation><mods:affiliation>IRD, UMR Géosciences Azur, Villefranche sur mer, France</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:AE02D2F33E6783E31B2AB8E706BE02D747DE4A04</idno><date when="2003" year="2003">2003</date><idno type="doi">10.1029/2002JB002041</idno><idno type="url">https://api.istex.fr/document/AE02D2F33E6783E31B2AB8E706BE02D747DE4A04/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001880</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001880</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand</title><author><name sortKey="Lebrun, Jean Rederic" sort="Lebrun, Jean Rederic" uniqKey="Lebrun J" first="Jean-Frédéric" last="Lebrun">Jean-Frédéric Lebrun</name><affiliation><mods:affiliation>Université des Antilles et de la Guyane, Pointe à Pitre, Guadeloupe (FWI), France</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: jflebrun@univ-ag.fr</mods:affiliation></affiliation></author><author><name sortKey="Lamarche, Geoffroy" sort="Lamarche, Geoffroy" uniqKey="Lamarche G" first="Geoffroy" last="Lamarche">Geoffroy Lamarche</name><affiliation><mods:affiliation>NIWA, Wellington, New Zealand</mods:affiliation></affiliation></author><author><name sortKey="Collot, Jean Ves" sort="Collot, Jean Ves" uniqKey="Collot J" first="Jean-Yves" last="Collot">Jean-Yves Collot</name><affiliation><mods:affiliation>IRD, UMR Géosciences Azur, Villefranche sur mer, France</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Geophysical Research: Solid Earth</title><title level="j" type="abbrev">J. Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2003-09">2003-09</date><biblScope unit="volume">108</biblScope><biblScope unit="issue">B9</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">AE02D2F33E6783E31B2AB8E706BE02D747DE4A04</idno><idno type="DOI">10.1029/2002JB002041</idno><idno type="ArticleID">2002JB002041</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">We first present a synthesis of the Macquarie Ridge Complex (MRC) tectonic structures as well as paleo‐reconstruction models of the kinematic evolution of the Pacific‐Australia plate boundary south of New Zealand, since the Eocene. We then ascertain the geodynamical conditions that preceded subduction initiation, and identify the nature and structures of the crust that first subducted, at the Puysegur subduction zone. This synthesis is used to produce a subduction initiation model for the Puysegur Region. Concomitant to inception of the Alpine Fault (ca. 23 Ma), a 150‐km‐wide transpressive relay zone developed along Puysegur Bank inherited structures, enabling localization of compressive deformation. Right‐lateral motion at the relay zone has juxtaposed oceanic and continental crusts facilitating inception of subduction and controlling the subduction vergence. Subsequently, the Puysegur subduction zone initiated at the transpressive relay zone ca. 20 Ma. Upper and lower plate inherited structures guided and facilitated the lengthening of the subduction zone during the Neogene. The four individual segments of the MRC represent different stages of incipient subduction whose development depends on local geodynamical conditions and lithospheric heterogeneities. The example of the MRC demonstrates that subduction can initiate from an oceanic spreading center, through progressive changes in plate kinematics within a 10–15 Myr time frame.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Jean‐Frédéric Lebrun</name><affiliations><json:string>Université des Antilles et de la Guyane, Pointe à Pitre, Guadeloupe (FWI), France</json:string><json:string>E-mail: jflebrun@univ-ag.fr</json:string></affiliations></json:item><json:item><name>Geoffroy Lamarche</name><affiliations><json:string>NIWA, Wellington, New Zealand</json:string></affiliations></json:item><json:item><name>Jean‐Yves Collot</name><affiliations><json:string>IRD, UMR Géosciences Azur, Villefranche sur mer, France</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>subduction initiation</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Pacific</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Australia</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>plate motion</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Cenezoic</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Macquarie Ridge</value></json:item></subject><articleId><json:string>2002JB002041</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>We first present a synthesis of the Macquarie Ridge Complex (MRC) tectonic structures as well as paleo‐reconstruction models of the kinematic evolution of the Pacific‐Australia plate boundary south of New Zealand, since the Eocene. We then ascertain the geodynamical conditions that preceded subduction initiation, and identify the nature and structures of the crust that first subducted, at the Puysegur subduction zone. This synthesis is used to produce a subduction initiation model for the Puysegur Region. Concomitant to inception of the Alpine Fault (ca. 23 Ma), a 150‐km‐wide transpressive relay zone developed along Puysegur Bank inherited structures, enabling localization of compressive deformation. Right‐lateral motion at the relay zone has juxtaposed oceanic and continental crusts facilitating inception of subduction and controlling the subduction vergence. Subsequently, the Puysegur subduction zone initiated at the transpressive relay zone ca. 20 Ma. Upper and lower plate inherited structures guided and facilitated the lengthening of the subduction zone during the Neogene. The four individual segments of the MRC represent different stages of incipient subduction whose development depends on local geodynamical conditions and lithospheric heterogeneities. The example of the MRC demonstrates that subduction can initiate from an oceanic spreading center, through progressive changes in plate kinematics within a 10–15 Myr time frame.</abstract><qualityIndicators><score>7.448</score><pdfVersion>1.3</pdfVersion><pdfPageSize>592 x 807 pts</pdfPageSize><refBibsNative>true</refBibsNative><abstractCharCount>1455</abstractCharCount><pdfWordCount>11029</pdfWordCount><pdfCharCount>69150</pdfCharCount><pdfPageCount>20</pdfPageCount><abstractWordCount>204</abstractWordCount></qualityIndicators><title>Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand</title><refBibs><json:item><author><json:item><name>C. J. Adams</name></json:item><json:item><name>A. F. 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Geophys. Res.</title><idno type="pISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><idno type="DOI">10.1002/(ISSN)2156-2202b</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2003-09"></date><biblScope unit="volume">108</biblScope><biblScope unit="issue">B9</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint></monogr><idno type="istex">AE02D2F33E6783E31B2AB8E706BE02D747DE4A04</idno><idno type="DOI">10.1029/2002JB002041</idno><idno type="ArticleID">2002JB002041</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2003</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>We first present a synthesis of the Macquarie Ridge Complex (MRC) tectonic structures as well as paleo‐reconstruction models of the kinematic evolution of the Pacific‐Australia plate boundary south of New Zealand, since the Eocene. We then ascertain the geodynamical conditions that preceded subduction initiation, and identify the nature and structures of the crust that first subducted, at the Puysegur subduction zone. This synthesis is used to produce a subduction initiation model for the Puysegur Region. Concomitant to inception of the Alpine Fault (ca. 23 Ma), a 150‐km‐wide transpressive relay zone developed along Puysegur Bank inherited structures, enabling localization of compressive deformation. Right‐lateral motion at the relay zone has juxtaposed oceanic and continental crusts facilitating inception of subduction and controlling the subduction vergence. Subsequently, the Puysegur subduction zone initiated at the transpressive relay zone ca. 20 Ma. Upper and lower plate inherited structures guided and facilitated the lengthening of the subduction zone during the Neogene. The four individual segments of the MRC represent different stages of incipient subduction whose development depends on local geodynamical conditions and lithospheric heterogeneities. The example of the MRC demonstrates that subduction can initiate from an oceanic spreading center, through progressive changes in plate kinematics within a 10–15 Myr time frame.</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>subduction initiation</term></item><item><term>Pacific</term></item><item><term>Australia</term></item><item><term>plate motion</term></item><item><term>Cenezoic</term></item><item><term>Macquarie Ridge</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>Geodesy and Gravity/Tectophysics</term></item><item><term>MARINE GEOLOGY AND GEOPHYSICS</term></item><item><term>Plate tectonics</term></item><item><term>TECTONOPHYSICS</term></item><item><term>Plate motions: general</term></item><item><term>INFORMATION RELATED TO GEOLOGIC TIME</term></item><item><term>Cenozoic</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>article-category</head><item><term>Geodesy and Gravity/Tectophysics</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2002-06-19">Received</change><change when="2003-04-08">Registration</change><change when="2003-09">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/AE02D2F33E6783E31B2AB8E706BE02D747DE4A04/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="jgrb13559"><header><publicationMeta level="product"><doi>10.1002/(ISSN)2156-2202b</doi><issn type="print">0148-0227</issn><issn type="electronic">2156-2202</issn><idGroup><id type="product" value="JGRB"></id><id type="coden" value="JGREA2"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH">Journal of Geophysical Research: Solid Earth</title><title type="short">J. Geophys. Res.</title></titleGroup></publicationMeta><publicationMeta level="part" position="90"><doi>10.1002/jgrb.v108.B9</doi><idGroup><id type="focusSection" value="2"></id></idGroup><titleGroup><title type="focusSection" xml:lang="en">Journal of Geophysical Research: Solid Earth</title></titleGroup><numberingGroup><numbering type="journalVolume" number="108">108</numbering><numbering type="journalIssue">B9</numbering></numberingGroup><coverDate startDate="2003-09">September 2003</coverDate></publicationMeta><publicationMeta level="unit" position="230" type="article" status="forIssue"><doi>10.1029/2002JB002041</doi><idGroup><id type="editorialOffice" value="2002JB002041"></id><id type="society" value="2453"></id><id type="unit" value="JGRB13559"></id></idGroup><countGroup><count type="pageTotal" number="18"></count></countGroup><titleGroup><title type="articleCategory">Geodesy and Gravity/Tectophysics</title><title type="tocHeading1">Geodesy and Gravity/Tectophysics</title></titleGroup><copyright ownership="thirdParty">Copyright 2003 by the American Geophysical Union.</copyright><eventGroup><event type="manuscriptReceived" date="2002-06-19"></event><event type="manuscriptRevised" date="2002-12-19"></event><event type="manuscriptAccepted" date="2003-04-08"></event><event type="firstOnline" date="2003-09-30"></event><event type="publishedOnlineFinalForm" date="2003-09-30"></event><event type="xmlConverted" agent="SPi Global Converter:AGUv3.42_TO_WileyML3Gv1.0.3 version:1.2; WileyML 3G Packaging Tool v1.0" date="2013-01-11"></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:4.1.7 mode:FullText,remove_FC" date="2014-10-30"></event></eventGroup><numberingGroup><numbering type="pageFirst">n/a</numbering><numbering type="pageLast">n/a</numbering></numberingGroup><subjectInfo><subject href="http://psi.agu.org/subset">Geodesy and Gravity/Tectophysics</subject><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/3000">MARINE GEOLOGY AND GEOPHYSICS</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/3040">Plate tectonics</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/8155">Plate motions: general</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="jgrb13559-cit-0000" type="self"><author><familyName>Lebrun</familyName>, <givenNames>J.‐F.</givenNames></author>, <author><givenNames>G.</givenNames> <familyName>Lamarche</familyName></author>, and <author><givenNames>J.‐Y.</givenNames> <familyName>Collot</familyName></author> (<pubYear year="2003">2003</pubYear>), <articleTitle>Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand</articleTitle>, <journalTitle>J. Geophys. Res.</journalTitle>, <vol>108</vol>, 2453, doi:<accessionId ref="info:doi/10.1029/2002JB002041">10.1029/2002JB002041</accessionId>, <issue>B9</issue>.</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:JGRB.JGRB13559.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="5"></count><count type="tableTotal" number="3"></count></countGroup><titleGroup><title type="main">Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand</title><title type="short">SUBDUCTION INITIATION AT STRIKE‐SLIP BOUNDARY</title><title type="shortAuthors">Lebrun <i>et al</i>.</title></titleGroup><creators><creator creatorRole="author" xml:id="jgrb13559-cr-0001" affiliationRef="#jgrb13559-aff-0001"><personName><givenNames>Jean‐Frédéric</givenNames> <familyName>Lebrun</familyName></personName><contactDetails><email normalForm="jflebrun@univ-ag.fr">jflebrun@univ-ag.fr</email></contactDetails></creator><creator creatorRole="author" xml:id="jgrb13559-cr-0002" affiliationRef="#jgrb13559-aff-0002"><personName><givenNames>Geoffroy</givenNames> <familyName>Lamarche</familyName></personName></creator><creator creatorRole="author" xml:id="jgrb13559-cr-0003" affiliationRef="#jgrb13559-aff-0003"><personName><givenNames>Jean‐Yves</givenNames> <familyName>Collot</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="FR" type="organization" xml:id="jgrb13559-aff-0001"><orgName>Université des Antilles et de la Guyane, Pointe à Pitre</orgName><address><city>Guadeloupe (FWI)</city><country>France</country></address></affiliation><affiliation countryCode="NZ" type="organization" xml:id="jgrb13559-aff-0002"><orgName>NIWA</orgName><address><city>Wellington</city><country>New Zealand</country></address></affiliation><affiliation countryCode="FR" type="organization" xml:id="jgrb13559-aff-0003"><orgDiv>IRD</orgDiv><orgName>UMR Géosciences Azur</orgName><address><city>Villefranche sur mer</city><country>France</country></address></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="jgrb13559-kwd-0001">subduction initiation</keyword><keyword xml:id="jgrb13559-kwd-0002">Pacific</keyword><keyword xml:id="jgrb13559-kwd-0003">Australia</keyword><keyword xml:id="jgrb13559-kwd-0004">plate motion</keyword><keyword xml:id="jgrb13559-kwd-0005">Cenezoic</keyword><keyword xml:id="jgrb13559-kwd-0006">Macquarie Ridge</keyword></keywordGroup><supportingInformation></supportingInformation><abstractGroup><abstract type="main"><p xml:id="jgrb13559-para-0001" label="1">We first present a synthesis of the Macquarie Ridge Complex (MRC) tectonic structures as well as paleo‐reconstruction models of the kinematic evolution of the Pacific‐Australia plate boundary south of New Zealand, since the Eocene. We then ascertain the geodynamical conditions that preceded subduction initiation, and identify the nature and structures of the crust that first subducted, at the Puysegur subduction zone. This synthesis is used to produce a subduction initiation model for the Puysegur Region. Concomitant to inception of the Alpine Fault (ca. 23 Ma), a 150‐km‐wide transpressive relay zone developed along Puysegur Bank inherited structures, enabling localization of compressive deformation. Right‐lateral motion at the relay zone has juxtaposed oceanic and continental crusts facilitating inception of subduction and controlling the subduction vergence. Subsequently, the Puysegur subduction zone initiated at the transpressive relay zone ca. 20 Ma. Upper and lower plate inherited structures guided and facilitated the lengthening of the subduction zone during the Neogene. The four individual segments of the MRC represent different stages of incipient subduction whose development depends on local geodynamical conditions and lithospheric heterogeneities. The example of the MRC demonstrates that subduction can initiate from an oceanic spreading center, through progressive changes in plate kinematics within a 10–15 Myr time frame.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>SUBDUCTION INITIATION AT STRIKE‐SLIP BOUNDARY</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand</title></titleInfo><name type="personal"><namePart type="given">Jean‐Frédéric</namePart><namePart type="family">Lebrun</namePart><affiliation>Université des Antilles et de la Guyane, Pointe à Pitre, Guadeloupe (FWI), France</affiliation><affiliation>E-mail: jflebrun@univ-ag.fr</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Geoffroy</namePart><namePart type="family">Lamarche</namePart><affiliation>NIWA, Wellington, New Zealand</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jean‐Yves</namePart><namePart type="family">Collot</namePart><affiliation>IRD, UMR Géosciences Azur, Villefranche sur mer, France</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">2003-09</dateIssued><dateCaptured encoding="w3cdtf">2002-06-19</dateCaptured><dateValid encoding="w3cdtf">2003-04-08</dateValid><edition>Lebrun, J.‐F., G. Lamarche, and J.‐Y. Collot (2003), Subduction initiation at a strike‐slip plate boundary: The Cenozoic Pacific‐Australian plate boundary, south of New Zealand, J. Geophys. Res., 108, 2453, doi:10.1029/2002JB002041, B9.</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">5</extent><extent unit="tables">3</extent></physicalDescription><abstract>We first present a synthesis of the Macquarie Ridge Complex (MRC) tectonic structures as well as paleo‐reconstruction models of the kinematic evolution of the Pacific‐Australia plate boundary south of New Zealand, since the Eocene. We then ascertain the geodynamical conditions that preceded subduction initiation, and identify the nature and structures of the crust that first subducted, at the Puysegur subduction zone. This synthesis is used to produce a subduction initiation model for the Puysegur Region. Concomitant to inception of the Alpine Fault (ca. 23 Ma), a 150‐km‐wide transpressive relay zone developed along Puysegur Bank inherited structures, enabling localization of compressive deformation. Right‐lateral motion at the relay zone has juxtaposed oceanic and continental crusts facilitating inception of subduction and controlling the subduction vergence. Subsequently, the Puysegur subduction zone initiated at the transpressive relay zone ca. 20 Ma. Upper and lower plate inherited structures guided and facilitated the lengthening of the subduction zone during the Neogene. The four individual segments of the MRC represent different stages of incipient subduction whose development depends on local geodynamical conditions and lithospheric heterogeneities. The example of the MRC demonstrates that subduction can initiate from an oceanic spreading center, through progressive changes in plate kinematics within a 10–15 Myr time frame.</abstract><subject><genre>keywords</genre><topic>subduction initiation</topic><topic>Pacific</topic><topic>Australia</topic><topic>plate motion</topic><topic>Cenezoic</topic><topic>Macquarie Ridge</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Geophysical Research: Solid Earth</title></titleInfo><titleInfo type="abbreviated"><title>J. Geophys. Res.</title></titleInfo><genre type="journal">journal</genre><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/subset">Geodesy and Gravity/Tectophysics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3000">MARINE GEOLOGY AND GEOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3040">Plate tectonics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8155">Plate motions: general</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><subject><genre>article-category</genre><topic>Geodesy and Gravity/Tectophysics</topic></subject><identifier type="ISSN">0148-0227</identifier><identifier type="eISSN">2156-2202</identifier><identifier type="DOI">10.1002/(ISSN)2156-2202b</identifier><identifier type="CODEN">JGREA2</identifier><identifier type="PublisherID">JGRB</identifier><part><date>2003</date><detail type="volume"><caption>vol.</caption><number>108</number></detail><detail type="issue"><caption>no.</caption><number>B9</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>18</total></extent></part></relatedItem><identifier type="istex">AE02D2F33E6783E31B2AB8E706BE02D747DE4A04</identifier><identifier type="DOI">10.1029/2002JB002041</identifier><identifier type="ArticleID">2002JB002041</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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