Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes
Identifieur interne : 000645 ( Istex/Corpus ); précédent : 000644; suivant : 000646Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes
Auteurs : Leland J. O'Driscoll ; Mark A. Richards ; Eugene D. HumphreysSource :
- Tectonics [ 0278-7407 ] ; 2012-04.
Abstract
The most prominent features of the Andean range are the Altiplano and Puna plateaus, which were constructed by crustal shortening and uplift over the past ∼45 Myr. The early construction of these plateaus may have controlled subsequent growth of the orogen. Proposed models have suggested that an abrupt acceleration in relative motion between the Nazca plate and the South American plate at ∼30 Ma may have led to compression of the continent. However, the major plate motion change occurred at 25–23 Ma, and paleomagnetic rotations and crustal shortening of the Andean forearc require that the Arica Bend formed prior to about 25 Ma. Inferred history of flat‐slab subduction along the Altiplano section of the Andean margin and the structure of the adjacent South American cratonic shield combine to suggest an alternate scenario, based partly upon geodynamic models of oceanic‐continental plate interactions in subduction zones. We propose that central Andean tectonism may have been controlled by two distinct regimes of subduction: (1) oblique subduction along the central Andean margin during the late Eocene and Oligocene accompanied by downdip alignment with the center of the Amazonian Shield (flat‐slab activity in this phase of orogenesis may have been caused by a combination of cratonic root enhanced tectonics and oceanic plateau subduction) and (2) an abrupt transition to trench‐normal subduction after ∼25 Ma toward the more distal São Francisco Craton was accompanied by a return to normal angle subduction. Similar interactions are hypothesized to have occurred during the Laramide Orogeny in western North America.
Url:
DOI: 10.1029/2011TC003036
Links to Exploration step
ISTEX:FD19358C0DCFF3A88CCE663F5224433ACB2266C6Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title><author><name sortKey="O Driscoll, Leland J" sort="O Driscoll, Leland J" uniqKey="O Driscoll L" first="Leland J." last="O'Driscoll">Leland J. O'Driscoll</name><affiliation><mods:affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: lodrisco@uoregon.edu</mods:affiliation></affiliation></author><author><name sortKey="Richards, Mark A" sort="Richards, Mark A" uniqKey="Richards M" first="Mark A." last="Richards">Mark A. Richards</name><affiliation><mods:affiliation>Department of Earth and Planetary Science, University of California, Berkeley, California, USA</mods:affiliation></affiliation></author><author><name sortKey="Humphreys, Eugene D" sort="Humphreys, Eugene D" uniqKey="Humphreys E" first="Eugene D." last="Humphreys">Eugene D. Humphreys</name><affiliation><mods:affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:FD19358C0DCFF3A88CCE663F5224433ACB2266C6</idno><date when="2012" year="2012">2012</date><idno type="doi">10.1029/2011TC003036</idno><idno type="url">https://api.istex.fr/document/FD19358C0DCFF3A88CCE663F5224433ACB2266C6/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000645</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title><author><name sortKey="O Driscoll, Leland J" sort="O Driscoll, Leland J" uniqKey="O Driscoll L" first="Leland J." last="O'Driscoll">Leland J. O'Driscoll</name><affiliation><mods:affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: lodrisco@uoregon.edu</mods:affiliation></affiliation></author><author><name sortKey="Richards, Mark A" sort="Richards, Mark A" uniqKey="Richards M" first="Mark A." last="Richards">Mark A. Richards</name><affiliation><mods:affiliation>Department of Earth and Planetary Science, University of California, Berkeley, California, USA</mods:affiliation></affiliation></author><author><name sortKey="Humphreys, Eugene D" sort="Humphreys, Eugene D" uniqKey="Humphreys E" first="Eugene D." last="Humphreys">Eugene D. Humphreys</name><affiliation><mods:affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</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="2012-04">2012-04</date><biblScope unit="volume">31</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">FD19358C0DCFF3A88CCE663F5224433ACB2266C6</idno><idno type="DOI">10.1029/2011TC003036</idno><idno type="ArticleID">2011TC003036</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0278-7407</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">The most prominent features of the Andean range are the Altiplano and Puna plateaus, which were constructed by crustal shortening and uplift over the past ∼45 Myr. The early construction of these plateaus may have controlled subsequent growth of the orogen. Proposed models have suggested that an abrupt acceleration in relative motion between the Nazca plate and the South American plate at ∼30 Ma may have led to compression of the continent. However, the major plate motion change occurred at 25–23 Ma, and paleomagnetic rotations and crustal shortening of the Andean forearc require that the Arica Bend formed prior to about 25 Ma. Inferred history of flat‐slab subduction along the Altiplano section of the Andean margin and the structure of the adjacent South American cratonic shield combine to suggest an alternate scenario, based partly upon geodynamic models of oceanic‐continental plate interactions in subduction zones. We propose that central Andean tectonism may have been controlled by two distinct regimes of subduction: (1) oblique subduction along the central Andean margin during the late Eocene and Oligocene accompanied by downdip alignment with the center of the Amazonian Shield (flat‐slab activity in this phase of orogenesis may have been caused by a combination of cratonic root enhanced tectonics and oceanic plateau subduction) and (2) an abrupt transition to trench‐normal subduction after ∼25 Ma toward the more distal São Francisco Craton was accompanied by a return to normal angle subduction. Similar interactions are hypothesized to have occurred during the Laramide Orogeny in western North America.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Leland J. O'Driscoll</name><affiliations><json:string>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</json:string><json:string>E-mail: lodrisco@uoregon.edu</json:string></affiliations></json:item><json:item><name>Mark A. Richards</name><affiliations><json:string>Department of Earth and Planetary Science, University of California, Berkeley, California, USA</json:string></affiliations></json:item><json:item><name>Eugene D. Humphreys</name><affiliations><json:string>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>Altiplano</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Bolivian Orocline</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>craton</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>flat‐slab</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>mantle wedge suction</value></json:item></subject><articleId><json:string>2011TC003036</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><qualityIndicators><score>9.5</score><pdfVersion>1.6</pdfVersion><pdfPageSize>612 x 792 pts (letter)</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>5</keywordCount><abstractCharCount>1634</abstractCharCount><pdfWordCount>11207</pdfWordCount><pdfCharCount>70305</pdfCharCount><pdfPageCount>16</pdfPageCount><abstractWordCount>250</abstractWordCount></qualityIndicators><title>Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title><genre><json:string>article</json:string></genre><host><volume>31</volume><publisherId><json:string>TECT</json:string></publisherId><pages><total>16</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>GEOCHEMISTRY</value></json:item><json:item><value>Subduction zone processes</value></json:item><json:item><value>MARINE GEOLOGY AND GEOPHYSICS</value></json:item><json:item><value>Plate tectonics</value></json:item><json:item><value>Subduction zone processes</value></json:item><json:item><value>MINERALOGY AND PETROLOGY</value></json:item><json:item><value>Subduction zone processes</value></json:item><json:item><value>TECTONOPHYSICS</value></json:item><json:item><value>Continental cratons</value></json:item><json:item><value>Continental tectonics: compressional</value></json:item><json:item><value>Dynamics: convection currents, and mantle plumes</value></json:item><json:item><value>Plate motions: past</value></json:item><json:item><value>Subduction zone processes</value></json:item><json:item><value>VOLCANOLOGY</value></json:item><json:item><value>Subduction zone processes</value></json:item></subject><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1944-9194</json:string></eissn><title>Tectonics</title><doi><json:string>10.1002/(ISSN)1944-9194</json:string></doi></host><publicationDate>2012</publicationDate><copyrightDate>2012</copyrightDate><doi><json:string>10.1029/2011TC003036</json:string></doi><id>FD19358C0DCFF3A88CCE663F5224433ACB2266C6</id><score>0.11161533</score><fulltext><json:item><original>true</original><mimetype>application/pdf</mimetype><extension>pdf</extension><uri>https://api.istex.fr/document/FD19358C0DCFF3A88CCE663F5224433ACB2266C6/fulltext/pdf</uri></json:item><json:item><original>false</original><mimetype>application/zip</mimetype><extension>zip</extension><uri>https://api.istex.fr/document/FD19358C0DCFF3A88CCE663F5224433ACB2266C6/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/FD19358C0DCFF3A88CCE663F5224433ACB2266C6/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Publishing Ltd</publisher><availability><p>Copyright 2012 by the American Geophysical Union</p></availability><date>2012</date></publicationStmt><notesStmt><note>NSF - No. EAR‐091106; No. EAR‐0745899; No. EAR‐0944229;</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title><author xml:id="author-1"><persName><forename type="first">Leland J.</forename><surname>O'Driscoll</surname></persName><email>lodrisco@uoregon.edu</email><affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</affiliation></author><author xml:id="author-2"><persName><forename type="first">Mark A.</forename><surname>Richards</surname></persName><affiliation>Department of Earth and Planetary Science, University of California, Berkeley, California, USA</affiliation></author><author xml:id="author-3"><persName><forename type="first">Eugene D.</forename><surname>Humphreys</surname></persName><affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</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="2012-04"></date><biblScope unit="volume">31</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">FD19358C0DCFF3A88CCE663F5224433ACB2266C6</idno><idno type="DOI">10.1029/2011TC003036</idno><idno type="ArticleID">2011TC003036</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2012</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>The most prominent features of the Andean range are the Altiplano and Puna plateaus, which were constructed by crustal shortening and uplift over the past ∼45 Myr. The early construction of these plateaus may have controlled subsequent growth of the orogen. Proposed models have suggested that an abrupt acceleration in relative motion between the Nazca plate and the South American plate at ∼30 Ma may have led to compression of the continent. However, the major plate motion change occurred at 25–23 Ma, and paleomagnetic rotations and crustal shortening of the Andean forearc require that the Arica Bend formed prior to about 25 Ma. Inferred history of flat‐slab subduction along the Altiplano section of the Andean margin and the structure of the adjacent South American cratonic shield combine to suggest an alternate scenario, based partly upon geodynamic models of oceanic‐continental plate interactions in subduction zones. We propose that central Andean tectonism may have been controlled by two distinct regimes of subduction: (1) oblique subduction along the central Andean margin during the late Eocene and Oligocene accompanied by downdip alignment with the center of the Amazonian Shield (flat‐slab activity in this phase of orogenesis may have been caused by a combination of cratonic root enhanced tectonics and oceanic plateau subduction) and (2) an abrupt transition to trench‐normal subduction after ∼25 Ma toward the more distal São Francisco Craton was accompanied by a return to normal angle subduction. Similar interactions are hypothesized to have occurred during the Laramide Orogeny in western North America.</p></abstract><abstract style="short"><p>Nazca plate interaction with South America craton important Central Andean shortening before 25 Ma is placed in tectonic context Nazca reorganization at 25 Ma important in reconfiguring geodynamic forces</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>Altiplano</term></item><item><term>Bolivian Orocline</term></item><item><term>craton</term></item><item><term>flat‐slab</term></item><item><term>mantle wedge suction</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>GEOCHEMISTRY</term></item><item><term>Subduction zone processes</term></item><item><term>MARINE GEOLOGY AND GEOPHYSICS</term></item><item><term>Plate tectonics</term></item><item><term>Subduction zone processes</term></item><item><term>MINERALOGY AND PETROLOGY</term></item><item><term>Subduction zone processes</term></item><item><term>TECTONOPHYSICS</term></item><item><term>Continental cratons</term></item><item><term>Continental tectonics: compressional</term></item><item><term>Dynamics: convection currents, and mantle plumes</term></item><item><term>Plate motions: past</term></item><item><term>Subduction zone processes</term></item><item><term>VOLCANOLOGY</term></item><item><term>Subduction zone processes</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2011-09-30">Received</change><change when="2012-02-28">Registration</change><change when="2012-04">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/FD19358C0DCFF3A88CCE663F5224433ACB2266C6/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="tect2331"><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.v31.2</doi><numberingGroup><numbering type="journalVolume" number="31">31</numbering><numbering type="journalIssue">2</numbering></numberingGroup><coverDate startDate="2012-04">April 2012</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="50" status="forIssue"><doi>10.1029/2011TC003036</doi><idGroup><id type="editorialOffice" value="2011TC003036"></id><id type="society" value="TC2013"></id><id type="unit" value="TECT2331"></id></idGroup><countGroup><count type="pageTotal" number="16"></count></countGroup><copyright ownership="thirdParty">Copyright 2012 by the American Geophysical Union</copyright><eventGroup><event type="manuscriptReceived" date="2011-09-30"></event><event type="manuscriptRevised" date="2012-02-27"></event><event type="manuscriptAccepted" date="2012-02-28"></event><event type="firstOnline" date="2012-04-12"></event><event type="publishedOnlineFinalForm" date="2012-04-12"></event><event type="xmlConverted" agent="SPi Global Converter:AGUv5.2_TO_WileyML3Gv1.0.3 version:1.1; AGU2WileyML3G Final Clean Up v1.0; WileyML 3G Packaging Tool v1.0" date="2012-12-13"></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:4.3.4 mode:FullText" date="2015-02-24"></event></eventGroup><numberingGroup><numbering type="pageFirst">n/a</numbering><numbering type="pageLast">n/a</numbering></numberingGroup><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/1000">GEOCHEMISTRY</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/1031">Subduction zone processes</subject></subjectInfo><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><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/3060">Subduction zone processes</subject></subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/3600">MINERALOGY AND PETROLOGY</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/3613">Subduction zone processes</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/8103">Continental cratons</subject><subject href="http://psi.agu.org/taxonomy5/8108">Continental tectonics: compressional</subject><subject href="http://psi.agu.org/taxonomy5/8121">Dynamics: convection currents, and mantle plumes</subject><subject href="http://psi.agu.org/taxonomy5/8157">Plate motions: past</subject><subject href="http://psi.agu.org/taxonomy5/8170">Subduction zone processes</subject></subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/8400">VOLCANOLOGY</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/8413">Subduction zone processes</subject></subjectInfo></subjectInfo><selfCitationGroup><citation xml:id="tect2331-cit-0000" type="self"><author><familyName>O'Driscoll</familyName>, <givenNames>L. J.</givenNames></author>, <author><givenNames>M. A.</givenNames> <familyName>Richards</familyName></author>, and <author><givenNames>E. D.</givenNames> <familyName>Humphreys</familyName></author> (<pubYear year="2012">2012</pubYear>), <articleTitle>Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</articleTitle>, <journalTitle>Tectonics</journalTitle>, <vol>31</vol>, TC2013, doi:<accessionId ref="info:doi/10.1029/2011TC003036">10.1029/2011TC003036</accessionId>.</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:TECT.TECT2331.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="wordTotal" number="12300"></count><count type="figureTotal" number="6"></count></countGroup><titleGroup><title type="main">Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title><title type="shortAuthors">O'DRISCOLL ET AL.</title><title type="short">ANDEAN 37–25 MA FLAT‐SLAB DYNAMICS</title></titleGroup><creators><creator xml:id="tect2331-cr-0001" creatorRole="author" affiliationRef="#tect2331-aff-0001"><personName><givenNames>Leland J.</givenNames><familyName>O'Driscoll</familyName></personName><contactDetails><email>lodrisco@uoregon.edu</email></contactDetails></creator><creator xml:id="tect2331-cr-0002" creatorRole="author" affiliationRef="#tect2331-aff-0002"><personName><givenNames>Mark A.</givenNames><familyName>Richards</familyName></personName></creator><creator xml:id="tect2331-cr-0003" creatorRole="author" affiliationRef="#tect2331-aff-0001"><personName><givenNames>Eugene D.</givenNames><familyName>Humphreys</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="tect2331-aff-0001" countryCode="US" type="organization"><unparsedAffiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</unparsedAffiliation></affiliation><affiliation xml:id="tect2331-aff-0002" countryCode="US" type="organization"><unparsedAffiliation>Department of Earth and Planetary Science, University of California, Berkeley, California, USA</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="tect2331-kwd-0001">Altiplano</keyword><keyword xml:id="tect2331-kwd-0002">Bolivian Orocline</keyword><keyword xml:id="tect2331-kwd-0003">craton</keyword><keyword xml:id="tect2331-kwd-0004">flat‐slab</keyword><keyword xml:id="tect2331-kwd-0005">mantle wedge suction</keyword></keywordGroup><fundingInfo><fundingAgency>NSF</fundingAgency><fundingNumber>EAR‐091106 </fundingNumber><fundingNumber>EAR‐0745899</fundingNumber><fundingNumber>EAR‐0944229</fundingNumber></fundingInfo><supportingInformation xml:id="tect2331-sup-0000"><p xml:id="tect2331-para-0001">Auxiliary material for this article contains four additional figures and accompanying captions.</p><p xml:id="tect2331-para-0002">Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac).</p><p xml:id="tect2331-para-0003">Additional file information is provided in the readme.txt.</p><supportingInfoItem><mediaResource alt="supplementary data" mimeType="text/plain" href="urn-x:wiley:02787407:media:tect2331:tect2331-sup-0001-readme"></mediaResource><caption>readme.txt</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="application/msword" href="urn-x:wiley:02787407:media:tect2331:tect2331-sup-0002-txts01"></mediaResource><caption>Text S1. Figure captions.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="application/pdf" href="urn-x:wiley:02787407:media:tect2331:tect2331-sup-0003-fs01"></mediaResource><caption>Figure S1. Finite element model starting conditions.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="application/pdf" href="urn-x:wiley:02787407:media:tect2331:tect2331-sup-0004-fs02"></mediaResource><caption>Figure S2. Stress fields for our reference rootless model.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="application/pdf" href="urn-x:wiley:02787407:media:tect2331:tect2331-sup-0005-fs03"></mediaResource><caption>Figure S3. Stress fields for our models that represent cratonic root lithosphere in South America.</caption></supportingInfoItem><supportingInfoItem><mediaResource alt="supplementary data" mimeType="application/pdf" href="urn-x:wiley:02787407:media:tect2331:tect2331-sup-0006-fs04"></mediaResource><caption>Figure S4. Compares along‐strike integrated slab lifting force of a model representing more distal cratonic structure with the model discussed in the main manuscript.</caption></supportingInfoItem></supportingInformation><abstractGroup><abstract type="main"><p xml:id="tect2331-para-0004" label="1">The most prominent features of the Andean range are the Altiplano and Puna plateaus, which were constructed by crustal shortening and uplift over the past ∼45 Myr. The early construction of these plateaus may have controlled subsequent growth of the orogen. Proposed models have suggested that an abrupt acceleration in relative motion between the Nazca plate and the South American plate at ∼30 Ma may have led to compression of the continent. However, the major plate motion change occurred at 25–23 Ma, and paleomagnetic rotations and crustal shortening of the Andean forearc require that the Arica Bend formed prior to about 25 Ma. Inferred history of flat‐slab subduction along the Altiplano section of the Andean margin and the structure of the adjacent South American cratonic shield combine to suggest an alternate scenario, based partly upon geodynamic models of oceanic‐continental plate interactions in subduction zones. We propose that central Andean tectonism may have been controlled by two distinct regimes of subduction: (1) oblique subduction along the central Andean margin during the late Eocene and Oligocene accompanied by downdip alignment with the center of the Amazonian Shield (flat‐slab activity in this phase of orogenesis may have been caused by a combination of cratonic root enhanced tectonics and oceanic plateau subduction) and (2) an abrupt transition to trench‐normal subduction after ∼25 Ma toward the more distal São Francisco Craton was accompanied by a return to normal angle subduction. Similar interactions are hypothesized to have occurred during the Laramide Orogeny in western North America.</p></abstract><abstract type="short"><title type="main">Key Points</title><p xml:id="tect2331-para-0005"><list style="bulleted"><listItem>Nazca plate interaction with South America craton important</listItem><listItem>Central Andean shortening before 25 Ma is placed in tectonic context</listItem><listItem>Nazca reorganization at 25 Ma important in reconfiguring geodynamic forces</listItem></list></p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>ANDEAN 37–25 MA FLAT‐SLAB DYNAMICS</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes</title></titleInfo><name type="personal"><namePart type="given">Leland J.</namePart><namePart type="family">O'Driscoll</namePart><affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</affiliation><affiliation>E-mail: lodrisco@uoregon.edu</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Mark A.</namePart><namePart type="family">Richards</namePart><affiliation>Department of Earth and Planetary Science, University of California, Berkeley, California, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Eugene D.</namePart><namePart type="family">Humphreys</namePart><affiliation>Department of Geological Sciences, University of Oregon, Eugene, Oregon, USA</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">2012-04</dateIssued><dateCaptured encoding="w3cdtf">2011-09-30</dateCaptured><dateValid encoding="w3cdtf">2012-02-28</dateValid><edition>O'Driscoll, L. J., M. A. Richards, and E. D. Humphreys (2012), Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes, Tectonics, 31, TC2013, doi:10.1029/2011TC003036.</edition><copyrightDate encoding="w3cdtf">2012</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">6</extent><extent unit="words">12300</extent></physicalDescription><abstract>The most prominent features of the Andean range are the Altiplano and Puna plateaus, which were constructed by crustal shortening and uplift over the past ∼45 Myr. The early construction of these plateaus may have controlled subsequent growth of the orogen. Proposed models have suggested that an abrupt acceleration in relative motion between the Nazca plate and the South American plate at ∼30 Ma may have led to compression of the continent. However, the major plate motion change occurred at 25–23 Ma, and paleomagnetic rotations and crustal shortening of the Andean forearc require that the Arica Bend formed prior to about 25 Ma. Inferred history of flat‐slab subduction along the Altiplano section of the Andean margin and the structure of the adjacent South American cratonic shield combine to suggest an alternate scenario, based partly upon geodynamic models of oceanic‐continental plate interactions in subduction zones. We propose that central Andean tectonism may have been controlled by two distinct regimes of subduction: (1) oblique subduction along the central Andean margin during the late Eocene and Oligocene accompanied by downdip alignment with the center of the Amazonian Shield (flat‐slab activity in this phase of orogenesis may have been caused by a combination of cratonic root enhanced tectonics and oceanic plateau subduction) and (2) an abrupt transition to trench‐normal subduction after ∼25 Ma toward the more distal São Francisco Craton was accompanied by a return to normal angle subduction. Similar interactions are hypothesized to have occurred during the Laramide Orogeny in western North America.</abstract><abstract type="short">Nazca plate interaction with South America craton important Central Andean shortening before 25 Ma is placed in tectonic context Nazca reorganization at 25 Ma important in reconfiguring geodynamic forces</abstract><note type="funding">NSF - No. EAR‐091106; No. EAR‐0745899; No. EAR‐0944229; </note><subject><genre>keywords</genre><topic>Altiplano</topic><topic>Bolivian Orocline</topic><topic>craton</topic><topic>flat‐slab</topic><topic>mantle wedge suction</topic></subject><relatedItem type="host"><titleInfo><title>Tectonics</title></titleInfo><titleInfo type="abbreviated"><title>Tectonics</title></titleInfo><genre type="journal">journal</genre><note type="content"> Auxiliary material for this article contains four additional figures and accompanying captions. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). Additional file information is provided in the readme.txt. Auxiliary material for this article contains four additional figures and accompanying captions. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). Additional file information is provided in the readme.txt. Auxiliary material for this article contains four additional figures and accompanying captions. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). Additional file information is provided in the readme.txt.Supporting Info Item: readme.txt - Text S1. Figure captions. - Figure S1. Finite element model starting conditions. - Figure S2. Stress fields for our reference rootless model. - Figure S3. Stress fields for our models that represent cratonic root lithosphere in South America. - Figure S4. Compares along‐strike integrated slab lifting force of a model representing more distal cratonic structure with the model discussed in the main manuscript. - </note><subject><genre>index-terms</genre><topic authorityURI="http://psi.agu.org/taxonomy5/1000">GEOCHEMISTRY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/1031">Subduction zone processes</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/taxonomy5/3060">Subduction zone processes</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3600">MINERALOGY AND PETROLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/3613">Subduction zone processes</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8103">Continental cratons</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8108">Continental tectonics: compressional</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8121">Dynamics: convection currents, and mantle plumes</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8157">Plate motions: past</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8170">Subduction zone processes</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8400">VOLCANOLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8413">Subduction zone processes</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>2012</date><detail type="volume"><caption>vol.</caption><number>31</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>16</total></extent></part></relatedItem><identifier type="istex">FD19358C0DCFF3A88CCE663F5224433ACB2266C6</identifier><identifier type="DOI">10.1029/2011TC003036</identifier><identifier type="ArticleID">2011TC003036</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2012 by the American Geophysical Union</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource></recordInfo></mods></metadata><enrichments><json:item><type>multicat</type><uri>https://api.istex.fr/document/FD19358C0DCFF3A88CCE663F5224433ACB2266C6/enrichments/multicat</uri></json:item></enrichments><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Ticri/CIDE/explor/CyberinfraV1/Data/Istex/Corpus
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000645 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Istex/Corpus/biblio.hfd -nk 000645 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Ticri/CIDE
|area= CyberinfraV1
|flux= Istex
|étape= Corpus
|type= RBID
|clé= ISTEX:FD19358C0DCFF3A88CCE663F5224433ACB2266C6
|texte= Nazca–South America interactions and the late Eocene–late Oligocene flat‐slab episode in the central Andes
}}
| This area was generated with Dilib version V0.6.25. |  |