Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean
Identifieur interne : 000485 ( Istex/Corpus ); précédent : 000484; suivant : 000486Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean
Auteurs : E. Schm Dicke ; T. M. WillSource :
- Journal of Metamorphic Geology [ 0263-4929 ] ; 2003-10.
English descriptors
- KwdEn :
- Amphibole, Assemblage, Avigad, Blackwell publishing, Blueschist, Blueschist unit, Blueschist units, Brocker, Bulk rock composition, Calcic, Calcic amphibole, Central aegean, Chlorite, Complex phase diagram, Conventional geothermobarometry, Conventional thermobarometry, Crete, Crustal, Crustal extension, Cyclades, Cycladic, Cycladic blueschist unit, Decompression, Eastern mediterranean, Eclogite, Eclogite facies rocks, Eclogites, Eocene, Epidote, Equilibration, European journal, Exhumation, Facies, Garnet, Geological society, Greenschist, Greenschist facies metamorphism, Greenschist unit, Greenschist units, Higher temperatures, Isothermal, Isothermal decompression, Isothermal decompression path, Kbar, Lawsonite, Lister, Long dimension, Metamorphic, Metamorphic event, Metamorphic geology, Metamorphic rocks, Metamorphism, Mineral assemblages, Mineral equilibria, Miocene, Model system, Ncfmash, Northern sifnos, Okrusch, Oligocene, Omphacite, Overprint, Paragonite, Peak assemblage, Petrology, Phase diagram, Phase diagrams, Phase relations, Phengite, Pseudosections, Quartz, Retrograde, Retrograde overprint, Ring layer, Schliestedt, Schliestedt matthews, Schliestedt okrusch, Sifnos, Sifnos samples, Sodic, Sodic amphibole, Stability range, Structural geology, Subduction, Tectonic, Tectonic contact, Thin section observations, Trivariant, Vroulidia, Western turkey, Wijbrans, Wijbrans mcdougall.
- Teeft :
- Amphibole, Assemblage, Avigad, Blackwell publishing, Blueschist, Blueschist unit, Blueschist units, Brocker, Bulk rock composition, Calcic, Calcic amphibole, Central aegean, Chlorite, Complex phase diagram, Conventional geothermobarometry, Conventional thermobarometry, Crete, Crustal, Crustal extension, Cyclades, Cycladic, Cycladic blueschist unit, Decompression, Eastern mediterranean, Eclogite, Eclogite facies rocks, Eclogites, Eocene, Epidote, Equilibration, European journal, Exhumation, Facies, Garnet, Geological society, Greenschist, Greenschist facies metamorphism, Greenschist unit, Greenschist units, Higher temperatures, Isothermal, Isothermal decompression, Isothermal decompression path, Kbar, Lawsonite, Lister, Long dimension, Metamorphic, Metamorphic event, Metamorphic geology, Metamorphic rocks, Metamorphism, Mineral assemblages, Mineral equilibria, Miocene, Model system, Ncfmash, Northern sifnos, Okrusch, Oligocene, Omphacite, Overprint, Paragonite, Peak assemblage, Petrology, Phase diagram, Phase diagrams, Phase relations, Phengite, Pseudosections, Quartz, Retrograde, Retrograde overprint, Ring layer, Schliestedt, Schliestedt matthews, Schliestedt okrusch, Sifnos, Sifnos samples, Sodic, Sodic amphibole, Stability range, Structural geology, Subduction, Tectonic, Tectonic contact, Thin section observations, Trivariant, Vroulidia, Western turkey, Wijbrans, Wijbrans mcdougall.
Abstract
The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (HP) metamorphism. Using conventional geothermobarometry, the HP peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde P–T paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O reveal coeval decompression and cooling for both the blueschist and the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km−1 for both units. The retrograde overprint can be assigned to low‐pressure blueschist to HP greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the HP stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the HP units.
Url:
DOI: 10.1046/j.1525-1314.2003.00482.x
Links to Exploration step
ISTEX:E80EF9B8DD89848FA8D532E10AAC013163994199Le document en format XML
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mcdougall</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (HP) metamorphism. Using conventional geothermobarometry, the HP peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde P–T paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O reveal coeval decompression and cooling for both the blueschist and the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km−1 for both units. The retrograde overprint can be assigned to low‐pressure blueschist to HP greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the HP stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the HP units.</div></front></TEI><istex><corpusName>wiley</corpusName><keywords><teeft><json:string>blueschist</json:string><json:string>greenschist</json:string><json:string>exhumation</json:string><json:string>sifnos</json:string><json:string>schliestedt</json:string><json:string>facies</json:string><json:string>amphibole</json:string><json:string>greenschist unit</json:string><json:string>kbar</json:string><json:string>metamorphism</json:string><json:string>blueschist unit</json:string><json:string>overprint</json:string><json:string>sodic</json:string><json:string>okrusch</json:string><json:string>avigad</json:string><json:string>cycladic</json:string><json:string>lister</json:string><json:string>subduction</json:string><json:string>tectonic</json:string><json:string>wijbrans</json:string><json:string>metamorphic</json:string><json:string>crustal</json:string><json:string>omphacite</json:string><json:string>ncfmash</json:string><json:string>petrology</json:string><json:string>blackwell publishing</json:string><json:string>eclogite</json:string><json:string>sodic amphibole</json:string><json:string>epidote</json:string><json:string>pseudosections</json:string><json:string>miocene</json:string><json:string>vroulidia</json:string><json:string>cyclades</json:string><json:string>mineral assemblages</json:string><json:string>garnet</json:string><json:string>decompression</json:string><json:string>eocene</json:string><json:string>lawsonite</json:string><json:string>chlorite</json:string><json:string>crete</json:string><json:string>phengite</json:string><json:string>calcic</json:string><json:string>equilibration</json:string><json:string>greenschist units</json:string><json:string>metamorphic geology</json:string><json:string>schliestedt matthews</json:string><json:string>schliestedt okrusch</json:string><json:string>brocker</json:string><json:string>cycladic blueschist unit</json:string><json:string>eclogites</json:string><json:string>trivariant</json:string><json:string>oligocene</json:string><json:string>paragonite</json:string><json:string>assemblage</json:string><json:string>european journal</json:string><json:string>ring layer</json:string><json:string>conventional geothermobarometry</json:string><json:string>phase relations</json:string><json:string>long dimension</json:string><json:string>metamorphic event</json:string><json:string>peak assemblage</json:string><json:string>sifnos samples</json:string><json:string>phase diagram</json:string><json:string>wijbrans mcdougall</json:string><json:string>isothermal decompression</json:string><json:string>retrograde overprint</json:string><json:string>quartz</json:string><json:string>isothermal</json:string><json:string>conventional thermobarometry</json:string><json:string>complex phase diagram</json:string><json:string>central aegean</json:string><json:string>geological society</json:string><json:string>eastern mediterranean</json:string><json:string>phase diagrams</json:string><json:string>metamorphic rocks</json:string><json:string>western turkey</json:string><json:string>northern sifnos</json:string><json:string>higher temperatures</json:string><json:string>calcic amphibole</json:string><json:string>isothermal decompression path</json:string><json:string>crustal extension</json:string><json:string>thin section observations</json:string><json:string>blueschist units</json:string><json:string>mineral equilibria</json:string><json:string>eclogite facies rocks</json:string><json:string>tectonic contact</json:string><json:string>bulk rock composition</json:string><json:string>structural geology</json:string><json:string>stability range</json:string><json:string>model system</json:string><json:string>greenschist facies metamorphism</json:string><json:string>retrograde</json:string></teeft></keywords><author><json:item><name>E. Schmädicke</name><affiliations><json:string>Institut für Geologie und Mineralogie, Universität Erlangen‐Nürnberg, Schlossgarten 5a, D‐91054 Erlangen, Germany (esther@geol.uni‐erlangen.de)</json:string></affiliations></json:item><json:item><name>T. M. Will</name><affiliations><json:string>Mineralogisches Institut der Universität Würzburg, Am Hubland, D‐97074 Würzburg, Germany</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>Cyclades</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>exhumation</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>high‐pressure metamorphism</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>pseudosection</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Sifnos</value></json:item></subject><articleId><json:string>JMG482</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (HP) metamorphism. Using conventional geothermobarometry, the HP peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde P–T paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O reveal coeval decompression and cooling for both the blueschist and the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km−1 for both units. The retrograde overprint can be assigned to low‐pressure blueschist to HP greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the HP stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the HP units.</abstract><qualityIndicators><score>7.84</score><pdfVersion>1.4</pdfVersion><pdfPageSize>595 x 782 pts</pdfPageSize><refBibsNative>true</refBibsNative><abstractCharCount>1388</abstractCharCount><pdfWordCount>7647</pdfWordCount><pdfCharCount>51448</pdfCharCount><pdfPageCount>13</pdfPageCount><abstractWordCount>195</abstractWordCount></qualityIndicators><title>Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean</title><genre><json:string>article</json:string></genre><host><title>Journal of Metamorphic Geology</title><language><json:string>unknown</json:string></language><doi><json:string>10.1111/(ISSN)1525-1314</json:string></doi><issn><json:string>0263-4929</json:string></issn><eissn><json:string>1525-1314</json:string></eissn><publisherId><json:string>JMG</json:string></publisherId><volume>21</volume><issue>8</issue><pages><first>799</first><last>811</last><total>13</total></pages><genre><json:string>journal</json:string></genre></host><categories><wos><json:string>science</json:string><json:string>geology</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geochemistry & geophysics</json:string></scienceMetrix><inist><json:string>sciences appliquees, technologies et medecines</json:string><json:string>sciences exactes et technologie</json:string><json:string>terre, ocean, espace</json:string><json:string>sciences de la terre</json:string></inist></categories><publicationDate>2003</publicationDate><copyrightDate>2003</copyrightDate><doi><json:string>10.1046/j.1525-1314.2003.00482.x</json:string></doi><id>E80EF9B8DD89848FA8D532E10AAC013163994199</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/E80EF9B8DD89848FA8D532E10AAC013163994199/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/E80EF9B8DD89848FA8D532E10AAC013163994199/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/E80EF9B8DD89848FA8D532E10AAC013163994199/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main">Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean</title></titleStmt><publicationStmt><publisher>Blackwell Science Inc</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2003-10"></date></publicationStmt><notesStmt><note type="content-type" subtype="article" source="article" scheme="https://content-type.data.istex.fr/ark:/67375/XTP-6N5SZHKN-D">article</note><note type="publication-type" subtype="journal" scheme="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</note></notesStmt><sourceDesc><biblStruct type="article"><analytic><title level="a" type="main">Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean</title><title level="a" type="short">P–T EVOLUTION AND EXHUMATION, SIFNOS</title><author xml:id="author-0000"><persName><forename type="first">E.</forename><surname>Schmädicke</surname></persName><affiliation>
Institut für Geologie und Mineralogie, Universität Erlangen‐Nürnberg, Schlossgarten 5a, D‐91054 Erlangen, Germany () <address><country key="DE"></country></address></affiliation><email>esther@geol.uni‐erlangen.de</email></author><author xml:id="author-0001"><persName><forename type="first">T. M.</forename><surname>Will</surname></persName><affiliation>Mineralogisches Institut der Universität Würzburg, Am Hubland, D‐97074 Würzburg, Germany<address><country key="DE"></country></address></affiliation></author><idno type="istex">E80EF9B8DD89848FA8D532E10AAC013163994199</idno><idno type="DOI">10.1046/j.1525-1314.2003.00482.x</idno><idno type="unit">JMG482</idno><idno type="toTypesetVersion">file:JMG.JMG482.pdf</idno></analytic><monogr><title level="j" type="main">Journal of Metamorphic Geology</title><title level="j" type="alt">JOURNAL OF METAMORPHIC GEOLOGY</title><idno type="pISSN">0263-4929</idno><idno type="eISSN">1525-1314</idno><idno type="book-DOI">10.1111/(ISSN)1525-1314</idno><idno type="book-part-DOI">10.1111/jmg.2003.21.issue-8</idno><idno type="product">JMG</idno><idno type="publisherDivision">ST</idno><imprint><biblScope unit="vol">21</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="799">799</biblScope><biblScope unit="page" to="811">811</biblScope><biblScope unit="page-count">13</biblScope><publisher>Blackwell Science Inc</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2003-10"></date></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><abstract xml:lang="en" style="main"><head>Abstract</head><p>The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (H<hi rend="italic">P</hi>) metamorphism. Using conventional geothermobarometry, the H<hi rend="italic">P</hi> peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde <hi rend="italic">P–T</hi> paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na<hi rend="subscript">2</hi>O–CaO–FeO–MgO–Al<hi rend="subscript">2</hi>O<hi rend="subscript">3</hi>–SiO<hi rend="subscript">2</hi>–H<hi rend="subscript">2</hi>O reveal coeval decompression and cooling for both the blueschist <hi rend="italic">and</hi> the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km<hi rend="superscript">−1</hi> for both units. The retrograde overprint can be assigned to low‐pressure blueschist to H<hi rend="italic">P</hi> greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the H<hi rend="italic">P</hi> stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the H<hi rend="italic">P</hi> units.</p></abstract><textClass><keywords xml:lang="en"><term xml:id="k1">Cyclades</term><term xml:id="k2">exhumation</term><term xml:id="k3">high‐pressure metamorphism</term><term xml:id="k4">pseudosection</term><term xml:id="k5">Sifnos</term></keywords><classCode scheme="tocHeading1">Original Articles</classCode></textClass><langUsage><language ident="EN"></language></langUsage></profileDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/E80EF9B8DD89848FA8D532E10AAC013163994199/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 version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Science Inc</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1525-1314</doi><issn type="print">0263-4929</issn><issn type="electronic">1525-1314</issn><idGroup><id type="product" value="JMG"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="JOURNAL OF METAMORPHIC GEOLOGY">Journal of Metamorphic Geology</title></titleGroup></publicationMeta><publicationMeta level="part" position="10008"><doi origin="wiley">10.1111/jmg.2003.21.issue-8</doi><numberingGroup><numbering type="journalVolume" number="21">21</numbering><numbering type="journalIssue" number="8">8</numbering></numberingGroup><coverDate startDate="2003-10">October 2003</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="0079900" status="forIssue"><doi origin="wiley">10.1046/j.1525-1314.2003.00482.x</doi><idGroup><id type="unit" value="JMG482"></id></idGroup><countGroup><count type="pageTotal" number="13"></count></countGroup><titleGroup><title type="tocHeading1">Original Articles</title></titleGroup><eventGroup><event type="firstOnline" date="2003-10-02"></event><event type="publishedOnlineFinalForm" date="2003-10-02"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:FullText result:FullText" date="2010-03-12"></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" number="799">799</numbering><numbering type="pageLast" number="811">811</numbering></numberingGroup><linkGroup><link type="toTypesetVersion" href="file:JMG.JMG482.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Received 26 April 2002; revision accepted 28 June 2003.</unparsedEditorialHistory><countGroup><count type="figureTotal" number="6"></count><count type="tableTotal" number="1"></count><count type="formulaTotal" number="0"></count><count type="referenceTotal" number="53"></count><count type="wordTotal" number="6873"></count><count type="linksPubMed" number="0"></count><count type="linksCrossRef" number="0"></count></countGroup><titleGroup><title type="main">Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean</title><title type="shortAuthors">E. SCHMÄDICKE & T. M. WILL</title><title type="short"><i>P–T</i> EVOLUTION AND EXHUMATION, SIFNOS</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>E.</givenNames><familyName>Schmädicke</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>T. M.</givenNames><familyName>Will</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="DE"><unparsedAffiliation>
Institut für Geologie und Mineralogie, Universität Erlangen‐Nürnberg, Schlossgarten 5a, D‐91054 Erlangen, Germany (<email normalForm="esther@geol.uni-erlangen.de">esther@geol.uni‐erlangen.de</email>) </unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="DE"><unparsedAffiliation>Mineralogisches Institut der Universität Würzburg, Am Hubland, D‐97074 Würzburg, Germany</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">Cyclades</keyword><keyword xml:id="k2">exhumation</keyword><keyword xml:id="k3">high‐pressure metamorphism</keyword><keyword xml:id="k4">pseudosection</keyword><keyword xml:id="k5">Sifnos</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title><p>The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (H<i>P</i>) metamorphism. Using conventional geothermobarometry, the H<i>P</i> peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde <i>P–T</i> paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na<sub>2</sub>O–CaO–FeO–MgO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–H<sub>2</sub>O reveal coeval decompression and cooling for both the blueschist <i>and</i> the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km<sup>−1</sup> for both units. The retrograde overprint can be assigned to low‐pressure blueschist to H<i>P</i> greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the H<i>P</i> stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the H<i>P</i> units.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>P–T EVOLUTION AND EXHUMATION, SIFNOS</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Pressure–temperature evolution of blueschist facies rocks from Sifnos, Greece, and implications for the exhumation of high‐pressure rocks in the Central Aegean</title></titleInfo><name type="personal"><namePart type="given">E.</namePart><namePart type="family">Schmädicke</namePart><affiliation>Institut für Geologie und Mineralogie, Universität Erlangen‐Nürnberg, Schlossgarten 5a, D‐91054 Erlangen, Germany (esther@geol.uni‐erlangen.de)</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">T. M.</namePart><namePart type="family">Will</namePart><affiliation>Mineralogisches Institut der Universität Würzburg, Am Hubland, D‐97074 Würzburg, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Science Inc</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2003-10</dateIssued><edition>Received 26 April 2002; revision accepted 28 June 2003.</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">6</extent><extent unit="tables">1</extent><extent unit="references">53</extent><extent unit="words">6873</extent></physicalDescription><abstract lang="en">The blueschist and greenschist units on the island of Sifnos, Cyclades were affected by Eocene high‐pressure (HP) metamorphism. Using conventional geothermobarometry, the HP peak metamorphic stage was determined at 550–600 °C and 20 kbar, close to the blueschist and the eclogite facies transition. The retrograde P–T paths are inferred with phase diagrams. Pseudosections based on a quantitative petrogenetic grid in the model system Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O reveal coeval decompression and cooling for both the blueschist and the greenschist unit. The conditions of the metamorphic peak and those of the retrograde stages conform to a similar metamorphic gradient of 10–12 °C km−1 for both units. The retrograde overprint can be assigned to low‐pressure blueschist to HP greenschist facies conditions. This result cannot be reconciled with the (prograde) Barrovian‐type event, which affected parts of the Cyclades during the Oligocene to Miocene. Instead, the retrograde overprint is interpreted in terms of exhumation, directly after the HP stage, without a separate metamorphic event. Constraints on the exhumation mechanism are given by decompression‐cooling paths, which can be explained by exhumation in a fore‐arc setting during on‐going subduction and associated crustal shortening. Back‐arc extension is only responsible for the final stage of exhumation of the HP units.</abstract><subject lang="en"><genre>keywords</genre><topic>Cyclades</topic><topic>exhumation</topic><topic>high‐pressure metamorphism</topic><topic>pseudosection</topic><topic>Sifnos</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Metamorphic Geology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0263-4929</identifier><identifier type="eISSN">1525-1314</identifier><identifier type="DOI">10.1111/(ISSN)1525-1314</identifier><identifier type="PublisherID">JMG</identifier><part><date>2003</date><detail type="volume"><caption>vol.</caption><number>21</number></detail><detail type="issue"><caption>no.</caption><number>8</number></detail><extent unit="pages"><start>799</start><end>811</end><total>13</total></extent></part></relatedItem><identifier type="istex">E80EF9B8DD89848FA8D532E10AAC013163994199</identifier><identifier type="DOI">10.1046/j.1525-1314.2003.00482.x</identifier><identifier type="ArticleID">JMG482</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Science Inc</recordOrigin></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/document/E80EF9B8DD89848FA8D532E10AAC013163994199/metadata/json</uri></json:item></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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