Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey
Identifieur interne : 002138 ( Istex/Corpus ); précédent : 002137; suivant : 002139Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey
Auteurs : Pierre Gautier ; Erdin Bozkurt ; Valérie Bosse ; Erwan Hallot ; Kadir DirikSource :
- Tectonics [ 0278-7407 ] ; 2008-02.
Abstract
The Niğde Massif, at the southern tip of the Central Anatolian Crystalline Complex, consists of two structural units. Foliations in the lower unit define a dome cored by migmatites. The contact between the two units bears all the elements of a ductile to brittle extensional detachment. Hence the Niğde Massif represents an extensional metamorphic core complex. Top‐to‐NE/ENE shearing at higher levels of the lower unit relates to displacement along the detachment. Deeper levels of the lower unit display high‐temperature top‐to‐SSW ductile shearing. The two shearing deformations show a difference in the mean trend of stretching lineations of up to 58°. New 40Ar/39Ar ages combined with previously published data enable us to infer that the two shears were contemporaneous. In our favored interpretation, oblique shearing in the core of the dome reflects lateral underflow, i.e., horizontal flowing of the lower crust in a direction highly oblique to the direction of extension. As a result of the interaction between lateral underflow and downdip shearing along the overlying detachment, distinct structural domains are expected to exist within the migmatitic part of the core complex, with observed counterparts in the Niğde dome. Lateral underflow may reflect “inward” flow on the scale of the core complex. Regional‐scale channel flow is an alternative that would better account for the record of non‐coaxial deformation in the core of the dome. More generally, we suspect that the development of lateral underflow in a metamorphic core complex more likely reflects regional channel flow, rather than local inward flow.
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DOI: 10.1029/2006TC002089
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Valerie" uniqKey="Bosse V" first="Valérie" last="Bosse">Valérie Bosse</name><affiliation><mods:affiliation>Laboratoire Magmas‐Volcans, UMR 6524 CNRS, Université Blaise Pascal, Clermont‐Ferrand, France</mods:affiliation></affiliation></author><author><name sortKey="Hallot, Erwan" sort="Hallot, Erwan" uniqKey="Hallot E" first="Erwan" last="Hallot">Erwan Hallot</name><affiliation><mods:affiliation>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</mods:affiliation></affiliation></author><author><name sortKey="Dirik, Kadir" sort="Dirik, Kadir" uniqKey="Dirik K" first="Kadir" last="Dirik">Kadir Dirik</name><affiliation><mods:affiliation>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Geological Engineering, Hacettepe University, Ankara, Turkey</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno 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France</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: pierre.gautier@univ-rennesl.fr</mods:affiliation></affiliation></author><author><name sortKey="Bozkurt, Erdin" sort="Bozkurt, Erdin" uniqKey="Bozkurt E" first="Erdin" last="Bozkurt">Erdin Bozkurt</name><affiliation><mods:affiliation>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</mods:affiliation></affiliation></author><author><name sortKey="Bosse, Valerie" sort="Bosse, Valerie" uniqKey="Bosse V" first="Valérie" last="Bosse">Valérie Bosse</name><affiliation><mods:affiliation>Laboratoire Magmas‐Volcans, UMR 6524 CNRS, Université Blaise Pascal, Clermont‐Ferrand, France</mods:affiliation></affiliation></author><author><name sortKey="Hallot, Erwan" sort="Hallot, Erwan" uniqKey="Hallot E" first="Erwan" last="Hallot">Erwan Hallot</name><affiliation><mods:affiliation>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</mods:affiliation></affiliation></author><author><name sortKey="Dirik, Kadir" sort="Dirik, Kadir" uniqKey="Dirik K" first="Kadir" last="Dirik">Kadir Dirik</name><affiliation><mods:affiliation>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</mods:affiliation></affiliation><affiliation><mods:affiliation>Department of Geological Engineering, Hacettepe University, Ankara, Turkey</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="2008-02">2008-02</date><biblScope unit="volume">27</biblScope><biblScope unit="issue">1</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">E0F00F12789532FD6D0ED894DC4806C58E32B688</idno><idno type="DOI">10.1029/2006TC002089</idno><idno type="ArticleID">2006TC002089</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 Niğde Massif, at the southern tip of the Central Anatolian Crystalline Complex, consists of two structural units. Foliations in the lower unit define a dome cored by migmatites. The contact between the two units bears all the elements of a ductile to brittle extensional detachment. Hence the Niğde Massif represents an extensional metamorphic core complex. Top‐to‐NE/ENE shearing at higher levels of the lower unit relates to displacement along the detachment. Deeper levels of the lower unit display high‐temperature top‐to‐SSW ductile shearing. The two shearing deformations show a difference in the mean trend of stretching lineations of up to 58°. New 40Ar/39Ar ages combined with previously published data enable us to infer that the two shears were contemporaneous. In our favored interpretation, oblique shearing in the core of the dome reflects lateral underflow, i.e., horizontal flowing of the lower crust in a direction highly oblique to the direction of extension. As a result of the interaction between lateral underflow and downdip shearing along the overlying detachment, distinct structural domains are expected to exist within the migmatitic part of the core complex, with observed counterparts in the Niğde dome. Lateral underflow may reflect “inward” flow on the scale of the core complex. Regional‐scale channel flow is an alternative that would better account for the record of non‐coaxial deformation in the core of the dome. More generally, we suspect that the development of lateral underflow in a metamorphic core complex more likely reflects regional channel flow, rather than local inward flow.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Pierre Gautier</name><affiliations><json:string>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</json:string><json:string>E-mail: pierre.gautier@univ-rennesl.fr</json:string></affiliations></json:item><json:item><name>Erdin Bozkurt</name><affiliations><json:string>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</json:string></affiliations></json:item><json:item><name>Valérie Bosse</name><affiliations><json:string>Laboratoire Magmas‐Volcans, UMR 6524 CNRS, Université Blaise Pascal, Clermont‐Ferrand, France</json:string></affiliations></json:item><json:item><name>Erwan Hallot</name><affiliations><json:string>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</json:string></affiliations></json:item><json:item><name>Kadir Dirik</name><affiliations><json:string>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</json:string><json:string>Department of Geological Engineering, Hacettepe University, Ankara, Turkey</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>Lower crustal flow</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>strain partitioning</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>argon geochronology</value></json:item></subject><articleId><json:string>2006TC002089</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>The Niğde Massif, at the southern tip of the Central Anatolian Crystalline Complex, consists of two structural units. Foliations in the lower unit define a dome cored by migmatites. The contact between the two units bears all the elements of a ductile to brittle extensional detachment. Hence the Niğde Massif represents an extensional metamorphic core complex. Top‐to‐NE/ENE shearing at higher levels of the lower unit relates to displacement along the detachment. Deeper levels of the lower unit display high‐temperature top‐to‐SSW ductile shearing. The two shearing deformations show a difference in the mean trend of stretching lineations of up to 58°. New 40Ar/39Ar ages combined with previously published data enable us to infer that the two shears were contemporaneous. In our favored interpretation, oblique shearing in the core of the dome reflects lateral underflow, i.e., horizontal flowing of the lower crust in a direction highly oblique to the direction of extension. As a result of the interaction between lateral underflow and downdip shearing along the overlying detachment, distinct structural domains are expected to exist within the migmatitic part of the core complex, with observed counterparts in the Niğde dome. Lateral underflow may reflect “inward” flow on the scale of the core complex. Regional‐scale channel flow is an alternative that would better account for the record of non‐coaxial deformation in the core of the dome. More generally, we suspect that the development of lateral underflow in a metamorphic core complex more likely reflects regional channel flow, rather than local inward flow.</abstract><qualityIndicators><score>8.488</score><pdfVersion>1.4</pdfVersion><pdfPageSize>612 x 792 pts (letter)</pdfPageSize><refBibsNative>true</refBibsNative><abstractCharCount>1626</abstractCharCount><pdfWordCount>16334</pdfWordCount><pdfCharCount>98039</pdfCharCount><pdfPageCount>27</pdfPageCount><abstractWordCount>249</abstractWordCount></qualityIndicators><title>Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey</title><refBibs><json:item><author><json:item><name>O. Akıman</name></json:item><json:item><name>A. Erler</name></json:item><json:item><name>M. C. Göncüoğlu</name></json:item><json:item><name>N. Güleç</name></json:item><json:item><name>A. Geven</name></json:item><json:item><name>T. K. 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lithosphere</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><categories><wos><json:string>science</json:string><json:string>geochemistry & geophysics</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geochemistry & geophysics</json:string></scienceMetrix></categories><publicationDate>2008</publicationDate><copyrightDate>2008</copyrightDate><doi><json:string>10.1029/2006TC002089</json:string></doi><id>E0F00F12789532FD6D0ED894DC4806C58E32B688</id><score>0.13184947</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/E0F00F12789532FD6D0ED894DC4806C58E32B688/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/E0F00F12789532FD6D0ED894DC4806C58E32B688/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/E0F00F12789532FD6D0ED894DC4806C58E32B688/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Publishing Ltd</publisher><availability><p>Copyright 2008 by the American Geophysical Union.</p></availability><date>2008</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey</title><author xml:id="author-1"><persName><forename type="first">Pierre</forename><surname>Gautier</surname></persName><email>pierre.gautier@univ-rennesl.fr</email><affiliation>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</affiliation></author><author xml:id="author-2"><persName><forename type="first">Erdin</forename><surname>Bozkurt</surname></persName><affiliation>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</affiliation></author><author xml:id="author-3"><persName><forename type="first">Valérie</forename><surname>Bosse</surname></persName><affiliation>Laboratoire Magmas‐Volcans, UMR 6524 CNRS, Université Blaise Pascal, Clermont‐Ferrand, France</affiliation></author><author xml:id="author-4"><persName><forename type="first">Erwan</forename><surname>Hallot</surname></persName><affiliation>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</affiliation></author><author xml:id="author-5"><persName><forename type="first">Kadir</forename><surname>Dirik</surname></persName><affiliation>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</affiliation><affiliation>Department of Geological Engineering, Hacettepe University, Ankara, Turkey</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="2008-02"></date><biblScope unit="volume">27</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint></monogr><idno type="istex">E0F00F12789532FD6D0ED894DC4806C58E32B688</idno><idno type="DOI">10.1029/2006TC002089</idno><idno type="ArticleID">2006TC002089</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2008</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>The Niğde Massif, at the southern tip of the Central Anatolian Crystalline Complex, consists of two structural units. Foliations in the lower unit define a dome cored by migmatites. The contact between the two units bears all the elements of a ductile to brittle extensional detachment. Hence the Niğde Massif represents an extensional metamorphic core complex. Top‐to‐NE/ENE shearing at higher levels of the lower unit relates to displacement along the detachment. Deeper levels of the lower unit display high‐temperature top‐to‐SSW ductile shearing. The two shearing deformations show a difference in the mean trend of stretching lineations of up to 58°. New 40Ar/39Ar ages combined with previously published data enable us to infer that the two shears were contemporaneous. In our favored interpretation, oblique shearing in the core of the dome reflects lateral underflow, i.e., horizontal flowing of the lower crust in a direction highly oblique to the direction of extension. As a result of the interaction between lateral underflow and downdip shearing along the overlying detachment, distinct structural domains are expected to exist within the migmatitic part of the core complex, with observed counterparts in the Niğde dome. Lateral underflow may reflect “inward” flow on the scale of the core complex. Regional‐scale channel flow is an alternative that would better account for the record of non‐coaxial deformation in the core of the dome. More generally, we suspect that the development of lateral underflow in a metamorphic core complex more likely reflects regional channel flow, rather than local inward flow.</p></abstract><textClass><keywords scheme="keyword"><list><head>keywords</head><item><term>Lower crustal flow</term></item><item><term>strain partitioning</term></item><item><term>argon geochronology</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>index-terms</head><item><term>EXPLORATION GEOPHYSICS</term></item><item><term>Continental structures</term></item><item><term>STRUCTURAL GEOLOGY</term></item><item><term>Kinematics of crustal and mantle deformation</term></item><item><term>Mesoscopic fabrics</term></item><item><term>Rheology: crust and lithosphere</term></item><item><term>TECTONOPHYSICS</term></item><item><term>Continental tectonics: extensional</term></item><item><term>Rheology: crust and lithosphere</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2006-11-30">Received</change><change when="2007-09-14">Registration</change><change when="2008-02">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/E0F00F12789532FD6D0ED894DC4806C58E32B688/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="tect1925"><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 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date="2007-09-14"></event><event type="firstOnline" date="2008-01-12"></event><event type="publishedOnlineFinalForm" date="2008-01-12"></event><event type="xmlConverted" agent="SPi Global Converter:AGUv3.44_TO_WileyML3Gv1.0.3 version:1.1; AGU2WileyML3G Final Clean Up v1.0; WileyML 3G Packaging Tool v1.0" date="2012-12-31"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-02-10"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-11-04"></event></eventGroup><numberingGroup><numbering type="pageFirst">n/a</numbering><numbering type="pageLast">n/a</numbering></numberingGroup><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/0900">EXPLORATION GEOPHYSICS</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/0905">Continental structures</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/8000">STRUCTURAL GEOLOGY</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/8011">Kinematics of crustal and mantle deformation</subject><subject href="http://psi.agu.org/taxonomy5/8025">Mesoscopic fabrics</subject><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/8031">Rheology: crust and lithosphere</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/8109">Continental tectonics: extensional</subject><subject href="http://psi.agu.org/taxonomy5/8159">Rheology: crust and lithosphere</subject></subjectInfo></subjectInfo><selfCitationGroup><citation xml:id="tect1925-cit-0000" type="self"><author><familyName>Gautier</familyName>, <givenNames>P.</givenNames></author>, <author><givenNames>E.</givenNames> <familyName>Bozkurt</familyName></author>, <author><givenNames>V.</givenNames> <familyName>Bosse</familyName></author>, <author><givenNames>E.</givenNames> <familyName>Hallot</familyName></author>, and <author><givenNames>K.</givenNames> <familyName>Dirik</familyName></author> (<pubYear year="2008">2008</pubYear>), <articleTitle>Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey</articleTitle>, <journalTitle>Tectonics</journalTitle>, <vol>27</vol>, TC1003, doi:<accessionId ref="info:doi/10.1029/2006TC002089">10.1029/2006TC002089</accessionId>.</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:TECT.TECT1925.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="figureTotal" number="15"></count></countGroup><titleGroup><title type="main">Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey</title><title type="short">CORE COMPLEX IN CENTRAL ANATOLIA</title><title type="shortAuthors">Gautier <i>et al</i>.</title></titleGroup><creators><creator creatorRole="author" xml:id="tect1925-cr-0001" affiliationRef="#tect1925-aff-0001"><personName><givenNames>Pierre</givenNames> <familyName>Gautier</familyName></personName><contactDetails><email normalForm="pierre.gautier@univ-rennesl.fr">pierre.gautier@univ-rennesl.fr</email></contactDetails></creator><creator creatorRole="author" xml:id="tect1925-cr-0002" affiliationRef="#tect1925-aff-0002"><personName><givenNames>Erdin</givenNames> <familyName>Bozkurt</familyName></personName></creator><creator creatorRole="author" xml:id="tect1925-cr-0003" affiliationRef="#tect1925-aff-0003"><personName><givenNames>Valérie</givenNames> <familyName>Bosse</familyName></personName></creator><creator creatorRole="author" xml:id="tect1925-cr-0004" affiliationRef="#tect1925-aff-0001"><personName><givenNames>Erwan</givenNames> <familyName>Hallot</familyName></personName></creator><creator creatorRole="author" xml:id="tect1925-cr-0005" affiliationRef="#tect1925-aff-0002 #tect1925-aff-0004"><personName><givenNames>Kadir</givenNames> <familyName>Dirik</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="FR" type="organization" xml:id="tect1925-aff-0001"><orgDiv>Géosciences Rennes</orgDiv><orgName>UMR 6118 CNRS, Université Rennes 1</orgName><address><city>Rennes</city><country>France</country></address></affiliation><affiliation countryCode="TR" type="organization" xml:id="tect1925-aff-0002"><orgDiv>Department of Geological Engineering, Tectonic Research Unit</orgDiv><orgName>Middle East Technical University</orgName><address><city>Ankara</city><country>Turkey</country></address></affiliation><affiliation countryCode="FR" type="organization" xml:id="tect1925-aff-0003"><orgDiv>Laboratoire Magmas‐Volcans</orgDiv><orgName>UMR 6524 CNRS, Université Blaise Pascal</orgName><address><city>Clermont‐Ferrand</city><country>France</country></address></affiliation><affiliation countryCode="TR" type="organization" xml:id="tect1925-aff-0004"><orgDiv>Department of Geological Engineering</orgDiv><orgName>Hacettepe University</orgName><address><city>Ankara</city><country>Turkey</country></address></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="tect1925-kwd-0001">Lower crustal flow</keyword><keyword xml:id="tect1925-kwd-0002">strain partitioning</keyword><keyword xml:id="tect1925-kwd-0003">argon geochronology</keyword></keywordGroup><abstractGroup><abstract type="main"><p xml:id="tect1925-para-0001" label="1">The Niğde Massif, at the southern tip of the Central Anatolian Crystalline Complex, consists of two structural units. Foliations in the lower unit define a dome cored by migmatites. The contact between the two units bears all the elements of a ductile to brittle extensional detachment. Hence the Niğde Massif represents an extensional metamorphic core complex. Top‐to‐NE/ENE shearing at higher levels of the lower unit relates to displacement along the detachment. Deeper levels of the lower unit display high‐temperature top‐to‐SSW ductile shearing. The two shearing deformations show a difference in the mean trend of stretching lineations of up to 58°. New <sup>40</sup>Ar/<sup>39</sup>Ar ages combined with previously published data enable us to infer that the two shears were contemporaneous. In our favored interpretation, oblique shearing in the core of the dome reflects lateral underflow, i.e., horizontal flowing of the lower crust in a direction highly oblique to the direction of extension. As a result of the interaction between lateral underflow and downdip shearing along the overlying detachment, distinct structural domains are expected to exist within the migmatitic part of the core complex, with observed counterparts in the Niğde dome. Lateral underflow may reflect “inward” flow on the scale of the core complex. Regional‐scale channel flow is an alternative that would better account for the record of non‐coaxial deformation in the core of the dome. More generally, we suspect that the development of lateral underflow in a metamorphic core complex more likely reflects regional channel flow, rather than local inward flow.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>CORE COMPLEX IN CENTRAL ANATOLIA</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey</title></titleInfo><name type="personal"><namePart type="given">Pierre</namePart><namePart type="family">Gautier</namePart><affiliation>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</affiliation><affiliation>E-mail: pierre.gautier@univ-rennesl.fr</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Erdin</namePart><namePart type="family">Bozkurt</namePart><affiliation>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Valérie</namePart><namePart type="family">Bosse</namePart><affiliation>Laboratoire Magmas‐Volcans, UMR 6524 CNRS, Université Blaise Pascal, Clermont‐Ferrand, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Erwan</namePart><namePart type="family">Hallot</namePart><affiliation>Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Rennes, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Kadir</namePart><namePart type="family">Dirik</namePart><affiliation>Department of Geological Engineering, Tectonic Research Unit, Middle East Technical University, Ankara, Turkey</affiliation><affiliation>Department of Geological Engineering, Hacettepe University, Ankara, Turkey</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">2008-02</dateIssued><dateCaptured encoding="w3cdtf">2006-11-30</dateCaptured><dateValid encoding="w3cdtf">2007-09-14</dateValid><edition>Gautier, P., E. Bozkurt, V. Bosse, E. Hallot, and K. Dirik (2008), Coeval extensional shearing and lateral underflow during Late Cretaceous core complex development in the Niğde Massif, Central Anatolia, Turkey, Tectonics, 27, TC1003, doi:10.1029/2006TC002089.</edition><copyrightDate encoding="w3cdtf">2008</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">15</extent></physicalDescription><abstract>The Niğde Massif, at the southern tip of the Central Anatolian Crystalline Complex, consists of two structural units. Foliations in the lower unit define a dome cored by migmatites. The contact between the two units bears all the elements of a ductile to brittle extensional detachment. Hence the Niğde Massif represents an extensional metamorphic core complex. Top‐to‐NE/ENE shearing at higher levels of the lower unit relates to displacement along the detachment. Deeper levels of the lower unit display high‐temperature top‐to‐SSW ductile shearing. The two shearing deformations show a difference in the mean trend of stretching lineations of up to 58°. New 40Ar/39Ar ages combined with previously published data enable us to infer that the two shears were contemporaneous. In our favored interpretation, oblique shearing in the core of the dome reflects lateral underflow, i.e., horizontal flowing of the lower crust in a direction highly oblique to the direction of extension. As a result of the interaction between lateral underflow and downdip shearing along the overlying detachment, distinct structural domains are expected to exist within the migmatitic part of the core complex, with observed counterparts in the Niğde dome. Lateral underflow may reflect “inward” flow on the scale of the core complex. Regional‐scale channel flow is an alternative that would better account for the record of non‐coaxial deformation in the core of the dome. More generally, we suspect that the development of lateral underflow in a metamorphic core complex more likely reflects regional channel flow, rather than local inward flow.</abstract><subject><genre>keywords</genre><topic>Lower crustal flow</topic><topic>strain partitioning</topic><topic>argon geochronology</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/taxonomy5/0900">EXPLORATION GEOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/0905">Continental structures</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8000">STRUCTURAL GEOLOGY</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8011">Kinematics of crustal and mantle deformation</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8025">Mesoscopic fabrics</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8031">Rheology: crust and lithosphere</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8100">TECTONOPHYSICS</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8109">Continental tectonics: extensional</topic><topic authorityURI="http://psi.agu.org/taxonomy5/8159">Rheology: crust and lithosphere</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>2008</date><detail type="volume"><caption>vol.</caption><number>27</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>n/a</start><end>n/a</end><total>27</total></extent></part></relatedItem><identifier type="istex">E0F00F12789532FD6D0ED894DC4806C58E32B688</identifier><identifier type="DOI">10.1029/2006TC002089</identifier><identifier type="ArticleID">2006TC002089</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright 2008 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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