Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models
Identifieur interne : 000306 ( Istex/Corpus ); précédent : 000305; suivant : 000307Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models
Auteurs : Georgia Pe-Piper ; David J. W. PiperSource :
- Geological Magazine [ 0016-7568 ] ; 2001-11.
Abstract
Nd isotopic composition has been determined for 16 igneous rocks, representing the wide geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in the Aegean area. Nd isotopes are used to further interpret previously published Pb and Sr isotope data. The overall pattern of late Cenozoic volcanism resulted from rapid extension, with thermal effects causing melting of hydrated, enriched, subcontinental lithosphere to produce widespread K-rich magmas. Slab break-off and intrusion of hot asthenosphere caused partial melting of rift-related continental margin basalts at the detachment point to generate adakitic magmas. Further outboard, mafic magma from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography. Proterozoic subduction-related enrichment in Th and U, together with other large-ion lithophile elements, produced distinctive Pb isotope composition. This was later modified where Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about 1.0 Ga, and generally high 87Sr/86Sr and high 207Pb/204Pb (∼ 15.68) and 208Pb/204Pb (∼ 39.0) for low 206Pb/204Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction of oceanic crust and sediments north of the passive margin of north Africa. Subduction of Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with higher 87Sr/86Sr and lower Ce/Sr. The strongly negative εNd for adakites in the central Aegean rules out a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once these minerals were consumed, younger magmas were produced by partial melting dominated by olivine and orthopyroxene.
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DOI: 10.1017/S0016756801005957
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</title><author><name sortKey="Pe Piper, Georgia" sort="Pe Piper, Georgia" uniqKey="Pe Piper G" first="Georgia" last="Pe-Piper">Georgia Pe-Piper</name><affiliation><mods:affiliation>Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada</mods:affiliation></affiliation></author><author><name sortKey="Piper, David J W" sort="Piper, David J W" uniqKey="Piper D" first="David J. W." last="Piper">David J. W. Piper</name><affiliation><mods:affiliation>GSC (Atlantic), Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:CE489828230E568E129628B1B616859523C7E6ED</idno><date when="2002" year="2002">2002</date><idno type="doi">10.1017/S0016756801005957</idno><idno type="url">https://api.istex.fr/document/CE489828230E568E129628B1B616859523C7E6ED/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000306</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000306</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</title><author><name sortKey="Pe Piper, Georgia" sort="Pe Piper, Georgia" uniqKey="Pe Piper G" first="Georgia" last="Pe-Piper">Georgia Pe-Piper</name><affiliation><mods:affiliation>Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada</mods:affiliation></affiliation></author><author><name sortKey="Piper, David J W" sort="Piper, David J W" uniqKey="Piper D" first="David J. W." last="Piper">David J. W. Piper</name><affiliation><mods:affiliation>GSC (Atlantic), Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Geological Magazine</title><idno type="ISSN">0016-7568</idno><idno type="eISSN">1469-5081</idno><imprint><publisher>Cambridge University Press</publisher><pubPlace>Cambridge, UK</pubPlace><date type="published" when="2001-11">2001-11</date><biblScope unit="volume">138</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="653">653</biblScope><biblScope unit="page" to="668">668</biblScope></imprint><idno type="ISSN">0016-7568</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0016-7568</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Nd isotopic composition has been determined for 16 igneous rocks, representing the wide geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in the Aegean area. Nd isotopes are used to further interpret previously published Pb and Sr isotope data. The overall pattern of late Cenozoic volcanism resulted from rapid extension, with thermal effects causing melting of hydrated, enriched, subcontinental lithosphere to produce widespread K-rich magmas. Slab break-off and intrusion of hot asthenosphere caused partial melting of rift-related continental margin basalts at the detachment point to generate adakitic magmas. Further outboard, mafic magma from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography. Proterozoic subduction-related enrichment in Th and U, together with other large-ion lithophile elements, produced distinctive Pb isotope composition. This was later modified where Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about 1.0 Ga, and generally high 87Sr/86Sr and high 207Pb/204Pb (∼ 15.68) and 208Pb/204Pb (∼ 39.0) for low 206Pb/204Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction of oceanic crust and sediments north of the passive margin of north Africa. Subduction of Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with higher 87Sr/86Sr and lower Ce/Sr. The strongly negative εNd for adakites in the central Aegean rules out a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once these minerals were consumed, younger magmas were produced by partial melting dominated by olivine and orthopyroxene.</div></front></TEI><istex><corpusName>cambridge</corpusName><author><json:item><name>GEORGIA PE-PIPER</name><affiliations><json:string>Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada</json:string></affiliations></json:item><json:item><name>DAVID J. W. 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Further outboard, mafic magma from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography. Proterozoic subduction-related enrichment in Th and U, together with other large-ion lithophile elements, produced distinctive Pb isotope composition. This was later modified where Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about 1.0 Ga, and generally high 87Sr/86Sr and high 207Pb/204Pb (∼ 15.68) and 208Pb/204Pb (∼ 39.0) for low 206Pb/204Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction of oceanic crust and sediments north of the passive margin of north Africa. Subduction of Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with higher 87Sr/86Sr and lower Ce/Sr. The strongly negative εNd for adakites in the central Aegean rules out a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once these minerals were consumed, younger magmas were produced by partial melting dominated by olivine and orthopyroxene.</abstract><qualityIndicators><score>10</score><pdfWordCount>8802</pdfWordCount><pdfCharCount>55659</pdfCharCount><pdfVersion>1.3</pdfVersion><pdfPageCount>16</pdfPageCount><pdfPageSize>595 x 841 pts</pdfPageSize><refBibsNative>false</refBibsNative><abstractWordCount>379</abstractWordCount><abstractCharCount>2655</abstractCharCount><keywordCount>0</keywordCount></qualityIndicators><title>Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</title><pii><json:string>S0016756801005957</json:string></pii><genre><json:string>research-article</json:string></genre><host><title>Geological Magazine</title><language><json:string>unknown</json:string></language><issn><json:string>0016-7568</json:string></issn><eissn><json:string>1469-5081</json:string></eissn><publisherId><json:string>GEO</json:string></publisherId><volume>138</volume><issue>6</issue><pages><first>653</first><last>668</last><total>16</total></pages><genre><json:string>journal</json:string></genre></host><ark><json:string>ark:/67375/6GQ-N74RRKM7-6</json:string></ark><publicationDate>2001</publicationDate><copyrightDate>2002</copyrightDate><doi><json:string>10.1017/S0016756801005957</json:string></doi><id>CE489828230E568E129628B1B616859523C7E6ED</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/CE489828230E568E129628B1B616859523C7E6ED/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/CE489828230E568E129628B1B616859523C7E6ED/fulltext/zip</uri></json:item><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/CE489828230E568E129628B1B616859523C7E6ED/fulltext/txt</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/CE489828230E568E129628B1B616859523C7E6ED/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher scheme="https://publisher-list.data.istex.fr">Cambridge University Press</publisher><pubPlace>Cambridge, UK</pubPlace><availability><licence><p>© 2001 Cambridge University Press</p></licence><p scheme="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-G3RCRD03-V">cambridge</p></availability><date>2002-01-31</date></publicationStmt><notesStmt><note type="research-article" scheme="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</note><note type="journal" scheme="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</title><author xml:id="author-0000"><persName><forename type="first">GEORGIA</forename><surname>PE-PIPER</surname></persName><affiliation>Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada</affiliation></author><author xml:id="author-0001"><persName><forename type="first">DAVID J. W.</forename><surname>PIPER</surname></persName><affiliation>GSC (Atlantic), Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada</affiliation></author><idno type="istex">CE489828230E568E129628B1B616859523C7E6ED</idno><idno type="ark">ark:/67375/6GQ-N74RRKM7-6</idno><idno type="DOI">10.1017/S0016756801005957</idno><idno type="PII">S0016756801005957</idno></analytic><monogr><title level="j">Geological Magazine</title><idno type="pISSN">0016-7568</idno><idno type="eISSN">1469-5081</idno><idno type="publisher-id">GEO</idno><imprint><publisher>Cambridge University Press</publisher><pubPlace>Cambridge, UK</pubPlace><date type="published" when="2001-11"></date><biblScope unit="volume">138</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="653">653</biblScope><biblScope unit="page" to="668">668</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2002-01-31</date></creation><langUsage><language ident="en">en</language></langUsage><abstract style="normal"><p>Nd isotopic composition has been determined for 16 igneous rocks, representing the wide geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in the Aegean area. Nd isotopes are used to further interpret previously published Pb and Sr isotope data. The overall pattern of late Cenozoic volcanism resulted from rapid extension, with thermal effects causing melting of hydrated, enriched, subcontinental lithosphere to produce widespread K-rich magmas. Slab break-off and intrusion of hot asthenosphere caused partial melting of rift-related continental margin basalts at the detachment point to generate adakitic magmas. Further outboard, mafic magma from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography. Proterozoic subduction-related enrichment in Th and U, together with other large-ion lithophile elements, produced distinctive Pb isotope composition. This was later modified where Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about 1.0 Ga, and generally high 87Sr/86Sr and high 207Pb/204Pb (∼ 15.68) and 208Pb/204Pb (∼ 39.0) for low 206Pb/204Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction of oceanic crust and sediments north of the passive margin of north Africa. Subduction of Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with higher 87Sr/86Sr and lower Ce/Sr. The strongly negative εNd for adakites in the central Aegean rules out a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once these minerals were consumed, younger magmas were produced by partial melting dominated by olivine and orthopyroxene.</p></abstract></profileDesc><revisionDesc><change when="2002-01-31">Created</change><change when="2001-11">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2017-09-5">References added</change></revisionDesc></teiHeader></istex:fulltextTEI></fulltext><metadata><istex:metadataXml wicri:clean="corpus cambridge not found" wicri:toSee="no header"><istex:xmlDeclaration>version='1.0' encoding='UTF-8'</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.0 20120330//EN" URI="JATS-journalpublishing1.dtd" name="istex:docType"></istex:docType><istex:document><article dtd-version="1.0" article-type="research-article"><front><journal-meta><journal-id journal-id-type="publisher-id">GEO</journal-id><journal-title-group><journal-title>Geological Magazine</journal-title><abbrev-journal-title>Geol. Mag.</abbrev-journal-title></journal-title-group><issn pub-type="epub">1469-5081</issn><issn pub-type="ppub">0016-7568</issn><publisher><publisher-name>Cambridge University Press</publisher-name><publisher-loc>Cambridge, UK</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pii">S0016756801005957</article-id><article-id pub-id-type="doi">10.1017/S0016756801005957</article-id><title-group><article-title>Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</article-title></title-group><contrib-group><contrib><name><surname>PE-PIPER</surname><given-names>GEORGIA</given-names></name><aff>Department of Geology, <institution>Saint Mary's University</institution>, Halifax, Nova Scotia, <country>Canada</country></aff></contrib><contrib><name><surname>PIPER</surname><given-names>DAVID J. W.</given-names></name><aff>GSC (Atlantic), <institution>Bedford Institute of Oceanography</institution>, Dartmouth, Nova Scotia, <country>Canada</country></aff></contrib></contrib-group><pub-date pub-type="epub"><day>31</day><month>1</month><year>2002</year></pub-date><pub-date pub-type="ppub"><month>11</month><year>2001</year></pub-date><volume>138</volume><issue>6</issue><fpage>653</fpage><lpage>668</lpage><history><date date-type="accepted"><day>19</day><month>7</month><year>2001</year></date><date date-type="received"><day>6</day><month>6</month><year>2000</year></date><date date-type="rev-recd"><day>17</day><month>7</month><year>2001</year></date></history><permissions><copyright-statement>© 2001 Cambridge University Press</copyright-statement></permissions><abstract abstract-type="normal"><p>Nd isotopic composition has been determined for 16 igneous rocks, representing the wide
geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in the Aegean
area. Nd isotopes are used to further interpret previously published Pb and Sr isotope data. The overall
pattern of late Cenozoic volcanism resulted from rapid extension, with thermal effects causing
melting of hydrated, enriched, subcontinental lithosphere to produce widespread K-rich magmas.
Slab break-off and intrusion of hot asthenosphere caused partial melting of rift-related continental
margin basalts at the detachment point to generate adakitic magmas. Further outboard, mafic magma
from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of
the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography.
Proterozoic subduction-related enrichment in Th and U, together with other large-ion
lithophile elements, produced distinctive Pb isotope composition. This was later modified where
Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate
sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas
sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about
1.0 Ga, and generally high <sup>87</sup>Sr/<sup>86</sup>Sr and high <sup>207</sup>Pb/<sup>204</sup>Pb (∼ 15.68) and <sup>208</sup>Pb/<sup>204</sup>Pb (∼ 39.0) for low
<sup>206</sup>Pb/<sup>204</sup>Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of
greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from
sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction
of oceanic crust and sediments north of the passive margin of north Africa. Subduction of
Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic
Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with
higher <sup>87</sup>Sr/<sup>86</sup>Sr and lower Ce/Sr. The strongly negative ε<sub>Nd</sub> for adakites in the central Aegean rules out
a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of
hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by
nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the
enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once
these minerals were consumed, younger magmas were produced by partial melting dominated by
olivine and orthopyroxene.</p></abstract><counts><page-count count="16"></page-count></counts><custom-meta-group><custom-meta><meta-name>pdf</meta-name><meta-value>S0016756801005957a.pdf</meta-value></custom-meta></custom-meta-group></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models</title></titleInfo><name type="personal"><namePart type="given">GEORGIA</namePart><namePart type="family">PE-PIPER</namePart><affiliation>Department of Geology, Saint Mary's University, Halifax, Nova Scotia, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">DAVID J. W.</namePart><namePart type="family">PIPER</namePart><affiliation>GSC (Atlantic), Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>Cambridge University Press</publisher><place><placeTerm type="text">Cambridge, UK</placeTerm></place><dateIssued encoding="w3cdtf">2001-11</dateIssued><dateCreated encoding="w3cdtf">2002-01-31</dateCreated><copyrightDate encoding="w3cdtf">2002</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><abstract type="normal">Nd isotopic composition has been determined for 16 igneous rocks, representing the wide geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in the Aegean area. Nd isotopes are used to further interpret previously published Pb and Sr isotope data. The overall pattern of late Cenozoic volcanism resulted from rapid extension, with thermal effects causing melting of hydrated, enriched, subcontinental lithosphere to produce widespread K-rich magmas. Slab break-off and intrusion of hot asthenosphere caused partial melting of rift-related continental margin basalts at the detachment point to generate adakitic magmas. Further outboard, mafic magma from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography. Proterozoic subduction-related enrichment in Th and U, together with other large-ion lithophile elements, produced distinctive Pb isotope composition. This was later modified where Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about 1.0 Ga, and generally high 87Sr/86Sr and high 207Pb/204Pb (∼ 15.68) and 208Pb/204Pb (∼ 39.0) for low 206Pb/204Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction of oceanic crust and sediments north of the passive margin of north Africa. Subduction of Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with higher 87Sr/86Sr and lower Ce/Sr. The strongly negative εNd for adakites in the central Aegean rules out a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once these minerals were consumed, younger magmas were produced by partial melting dominated by olivine and orthopyroxene.</abstract><relatedItem type="host"><titleInfo><title>Geological Magazine</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><identifier type="ISSN">0016-7568</identifier><identifier type="eISSN">1469-5081</identifier><identifier type="PublisherID">GEO</identifier><part><date>2001</date><detail type="volume"><caption>vol.</caption><number>138</number></detail><detail type="issue"><caption>no.</caption><number>6</number></detail><extent unit="pages"><start>653</start><end>668</end><total>16</total></extent></part></relatedItem><identifier type="istex">CE489828230E568E129628B1B616859523C7E6ED</identifier><identifier type="ark">ark:/67375/6GQ-N74RRKM7-6</identifier><identifier type="DOI">10.1017/S0016756801005957</identifier><identifier type="PII">S0016756801005957</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2001 Cambridge University Press</accessCondition><recordInfo><recordContentSource authority="ISTEX" authorityURI="https://loaded-corpus.data.istex.fr" valueURI="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-G3RCRD03-V">cambridge</recordContentSource><recordOrigin>© 2001 Cambridge University Press</recordOrigin></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/document/CE489828230E568E129628B1B616859523C7E6ED/metadata/json</uri></json:item></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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