The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up
Identifieur interne : 002413 ( Istex/Corpus ); précédent : 002412; suivant : 002414The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up
Auteurs : D. W. Peate ; J. A. Baker ; J. Blichert-Toft ; D. R. Hilton ; M. Storey ; A. J. R. Kent ; C. K. Brooks ; H. Hansen ; A. K. Pedersen ; R. A. DuncanSource :
- Journal of Petrology [ 0022-3530 ] ; 2003-02.
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Abstract
We present elemental and isotopic (Sr–Nd–Pb–Hf–Os–He) data on primitive alkalic lavas from the Prinsen af Wales Bjerge, East Greenland. Stratigraphical, compositional and 40Ar–39Ar data indicate that this inland alkalic activity was contemporaneous with the upper parts of the main tholeiitic plateau basalts and also post-dated them. The alkalic rocks show a marked crustal influence, indicating establishment of new magmatic plumbing systems distinct from the long-lived coastal systems that fed the relatively uncontaminated plateau basalts. The least contaminated lavas have high 3He/4He isotope ratios (R/RA 12·4–18·5), sub-chondritic 187Os/188Osi (0·120–0·126), low εNdi (∼+4) and εHfi (∼+6) that plot below the ‘Nd–Hf mantle array’, and trace element characteristics similar to HIMU ocean island basalt (OIB). The uncontaminated magma is inferred to have more radiogenic 206Pb/204Pb values (>19·2) than the plateau basalts and Icelandic basalts, and thus represents a possible ‘enriched’ component to explain the compositional variations within the plateau basalts. One model to explain these compositional features is preferential melting of recycled material within the plume upwelling beneath the thick lithospheric cap, with 3He contributed from volatile-rich fluids from elsewhere in the Icelandic plume. The exact nature of the recycled component is not yet resolved, although Hf isotope compositions rule out any significant role for recycled pelagic sediment, and the low 187Os/188Os limits the participation of recycled basaltic material and argues instead for a contribution from the mantle section of the recycled slab.
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DOI: 10.1093/petrology/44.2.279
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Blichert-Toft</name><affiliation><mods:affiliation>LABORATOIRE DES SCIENCES DE LA TERRE, ÉCOLE NORMALE SUPÉRIEURE DE LYON, 46 ALLÉE D’ITALIE, 69364 LYON CEDEX 7, FRANCE</mods:affiliation></affiliation></author><author><name sortKey="Hilton, D R" sort="Hilton, D R" uniqKey="Hilton D" first="D. R." last="Hilton">D. R. Hilton</name><affiliation><mods:affiliation>GEOSCIENCES RESEARCH DIVISION, SCRIPPS INSTITUTION OF OCEANOGRAPHY, LA JOLLA, CA 92093-0220, USA</mods:affiliation></affiliation></author><author><name sortKey="Storey, M" sort="Storey, M" uniqKey="Storey M" first="M." last="Storey">M. Storey</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Kent, A J R" sort="Kent, A J R" uniqKey="Kent A" first="A. J. R." last="Kent">A. J. R. Kent</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Brooks, C K" sort="Brooks, C K" uniqKey="Brooks C" first="C. K." last="Brooks">C. K. Brooks</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation><affiliation><mods:affiliation>GEOLOGICAL INSTITUTE, UNIVERSITY OF COPENHAGEN, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Hansen, H" sort="Hansen, H" uniqKey="Hansen H" first="H." last="Hansen">H. Hansen</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Pedersen, A K" sort="Pedersen, A K" uniqKey="Pedersen A" first="A. K." last="Pedersen">A. K. Pedersen</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation><affiliation><mods:affiliation>GEOLOGICAL MUSEUM, ØSTER VOLDGADE 5, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Duncan, R A" sort="Duncan, R A" uniqKey="Duncan R" first="R. A." last="Duncan">R. A. Duncan</name><affiliation><mods:affiliation>COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:6694C609F4D985F166A6324B9F50F183BC054163</idno><date when="2003" year="2003">2003</date><idno type="doi">10.1093/petrology/44.2.279</idno><idno type="url">https://api.istex.fr/document/6694C609F4D985F166A6324B9F50F183BC054163/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">002413</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">002413</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up</title><author><name sortKey="Peate, D W" sort="Peate, D W" uniqKey="Peate D" first="D. W." last="Peate">D. W. Peate</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Baker, J A" sort="Baker, J A" uniqKey="Baker J" first="J. A." last="Baker">J. A. Baker</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Blichert Toft, J" sort="Blichert Toft, J" uniqKey="Blichert Toft J" first="J." last="Blichert-Toft">J. Blichert-Toft</name><affiliation><mods:affiliation>LABORATOIRE DES SCIENCES DE LA TERRE, ÉCOLE NORMALE SUPÉRIEURE DE LYON, 46 ALLÉE D’ITALIE, 69364 LYON CEDEX 7, FRANCE</mods:affiliation></affiliation></author><author><name sortKey="Hilton, D R" sort="Hilton, D R" uniqKey="Hilton D" first="D. R." last="Hilton">D. R. Hilton</name><affiliation><mods:affiliation>GEOSCIENCES RESEARCH DIVISION, SCRIPPS INSTITUTION OF OCEANOGRAPHY, LA JOLLA, CA 92093-0220, USA</mods:affiliation></affiliation></author><author><name sortKey="Storey, M" sort="Storey, M" uniqKey="Storey M" first="M." last="Storey">M. Storey</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Kent, A J R" sort="Kent, A J R" uniqKey="Kent A" first="A. J. R." last="Kent">A. J. R. Kent</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Brooks, C K" sort="Brooks, C K" uniqKey="Brooks C" first="C. K." last="Brooks">C. K. Brooks</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation><affiliation><mods:affiliation>GEOLOGICAL INSTITUTE, UNIVERSITY OF COPENHAGEN, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Hansen, H" sort="Hansen, H" uniqKey="Hansen H" first="H." last="Hansen">H. Hansen</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Pedersen, A K" sort="Pedersen, A K" uniqKey="Pedersen A" first="A. K." last="Pedersen">A. K. Pedersen</name><affiliation><mods:affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation><affiliation><mods:affiliation>GEOLOGICAL MUSEUM, ØSTER VOLDGADE 5, DK-1350 COPENHAGEN K, DENMARK</mods:affiliation></affiliation></author><author><name sortKey="Duncan, R A" sort="Duncan, R A" uniqKey="Duncan R" first="R. A." last="Duncan">R. A. Duncan</name><affiliation><mods:affiliation>COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Petrology</title><title level="j" type="abbrev">J. Petrology</title><idno type="ISSN">0022-3530</idno><idno type="eISSN">1460-2415</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2003-02">2003-02</date><biblScope unit="volume">44</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="279">279</biblScope><biblScope unit="page" to="304">304</biblScope></imprint><idno type="ISSN">0022-3530</idno></series><idno type="istex">6694C609F4D985F166A6324B9F50F183BC054163</idno><idno type="DOI">10.1093/petrology/44.2.279</idno><idno type="local">112</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3530</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>East Greenland</term><term>Iceland plume</term><term>alkalic lavas</term><term>flood basalts</term><term>high 3He/4He</term><term>recycled lithosphere</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present elemental and isotopic (Sr–Nd–Pb–Hf–Os–He) data on primitive alkalic lavas from the Prinsen af Wales Bjerge, East Greenland. Stratigraphical, compositional and 40Ar–39Ar data indicate that this inland alkalic activity was contemporaneous with the upper parts of the main tholeiitic plateau basalts and also post-dated them. The alkalic rocks show a marked crustal influence, indicating establishment of new magmatic plumbing systems distinct from the long-lived coastal systems that fed the relatively uncontaminated plateau basalts. The least contaminated lavas have high 3He/4He isotope ratios (R/RA 12·4–18·5), sub-chondritic 187Os/188Osi (0·120–0·126), low εNdi (∼+4) and εHfi (∼+6) that plot below the ‘Nd–Hf mantle array’, and trace element characteristics similar to HIMU ocean island basalt (OIB). The uncontaminated magma is inferred to have more radiogenic 206Pb/204Pb values (>19·2) than the plateau basalts and Icelandic basalts, and thus represents a possible ‘enriched’ component to explain the compositional variations within the plateau basalts. One model to explain these compositional features is preferential melting of recycled material within the plume upwelling beneath the thick lithospheric cap, with 3He contributed from volatile-rich fluids from elsewhere in the Icelandic plume. The exact nature of the recycled component is not yet resolved, although Hf isotope compositions rule out any significant role for recycled pelagic sediment, and the low 187Os/188Os limits the participation of recycled basaltic material and argues instead for a contribution from the mantle section of the recycled slab.</div></front></TEI><istex><corpusName>oup</corpusName><author><json:item><name>D. W. PEATE</name><affiliations><json:string>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string></affiliations></json:item><json:item><name>J. A. BAKER</name><affiliations><json:string>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string></affiliations></json:item><json:item><name>J. BLICHERT-TOFT</name><affiliations><json:string>LABORATOIRE DES SCIENCES DE LA TERRE, ÉCOLE NORMALE SUPÉRIEURE DE LYON, 46 ALLÉE D’ITALIE, 69364 LYON CEDEX 7, FRANCE</json:string></affiliations></json:item><json:item><name>D. R. HILTON</name><affiliations><json:string>GEOSCIENCES RESEARCH DIVISION, SCRIPPS INSTITUTION OF OCEANOGRAPHY, LA JOLLA, CA 92093-0220, USA</json:string></affiliations></json:item><json:item><name>M. STOREY</name><affiliations><json:string>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string></affiliations></json:item><json:item><name>A. J. R. KENT</name><affiliations><json:string>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string></affiliations></json:item><json:item><name>C. K. BROOKS</name><affiliations><json:string>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string><json:string>GEOLOGICAL INSTITUTE, UNIVERSITY OF COPENHAGEN, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string></affiliations></json:item><json:item><name>H. HANSEN</name><affiliations><json:string>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string></affiliations></json:item><json:item><name>A. K. PEDERSEN</name><affiliations><json:string>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</json:string><json:string>GEOLOGICAL MUSEUM, ØSTER VOLDGADE 5, DK-1350 COPENHAGEN K, DENMARK</json:string></affiliations></json:item><json:item><name>R. A. DUNCAN</name><affiliations><json:string>COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>alkalic lavas</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>flood basalts</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>high 3He/4He</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>East Greenland</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>recycled lithosphere</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Iceland plume</value></json:item></subject><language><json:string>eng</json:string></language><originalGenre><json:string>research-article</json:string></originalGenre><abstract>We present elemental and isotopic (Sr–Nd–Pb–Hf–Os–He) data on primitive alkalic lavas from the Prinsen af Wales Bjerge, East Greenland. Stratigraphical, compositional and 40Ar–39Ar data indicate that this inland alkalic activity was contemporaneous with the upper parts of the main tholeiitic plateau basalts and also post-dated them. The alkalic rocks show a marked crustal influence, indicating establishment of new magmatic plumbing systems distinct from the long-lived coastal systems that fed the relatively uncontaminated plateau basalts. The least contaminated lavas have high 3He/4He isotope ratios (R/RA 12·4–18·5), sub-chondritic 187Os/188Osi (0·120–0·126), low εNdi (∼+4) and εHfi (∼+6) that plot below the ‘Nd–Hf mantle array’, and trace element characteristics similar to HIMU ocean island basalt (OIB). The uncontaminated magma is inferred to have more radiogenic 206Pb/204Pb values (>19·2) than the plateau basalts and Icelandic basalts, and thus represents a possible ‘enriched’ component to explain the compositional variations within the plateau basalts. One model to explain these compositional features is preferential melting of recycled material within the plume upwelling beneath the thick lithospheric cap, with 3He contributed from volatile-rich fluids from elsewhere in the Icelandic plume. The exact nature of the recycled component is not yet resolved, although Hf isotope compositions rule out any significant role for recycled pelagic sediment, and the low 187Os/188Os limits the participation of recycled basaltic material and argues instead for a contribution from the mantle section of the recycled slab.</abstract><qualityIndicators><score>9.76</score><pdfVersion>1.3</pdfVersion><pdfPageSize>595 x 842 pts (A4)</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>6</keywordCount><abstractCharCount>1637</abstractCharCount><pdfWordCount>14430</pdfWordCount><pdfCharCount>96604</pdfCharCount><pdfPageCount>26</pdfPageCount><abstractWordCount>230</abstractWordCount></qualityIndicators><title>The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up</title><refBibs><json:item><host><pages><last>276</last><first>257</first></pages><author></author><title>(eds) Magmatism in the Ocean Basins</title></host></json:item><json:item><author><json:item><name>C Chauvel</name></json:item><json:item><name>C Hémond</name></json:item></author><host><volume>1</volume><author></author><title>Geochemistry, Geophysics, Geosystems</title><publicationDate>2000</publicationDate></host><title>Melting of a complete section of recycled oceanic crust: trace element and Pb isotopic evidence from Iceland</title><publicationDate>2000</publicationDate></json:item><json:item><author><json:item><name>Y,M M Anwar</name></json:item><json:item><name>K Grönvold</name></json:item><json:item><name>P,J Hooker</name></json:item><json:item><name>K Muehlenbachs</name></json:item><json:item><name>V </name></json:item></author><host><volume>135</volume><pages><last>31</last><first>1</first></pages><author></author><title>Helium, Meddelelser om Grønland</title><publicationDate>1955</publicationDate></host><title>Geological investigations in East Greenland: Condomines, The petrography of the Prinsen af Wales Bjerge lavas</title><publicationDate>1955</publicationDate></json:item><json:item><author><json:item><name>Strontium Oxygen</name></json:item><json:item><name>V,C Neodymium Isotopic Relationships In Ice-Bennett</name></json:item><json:item><name>T,M Esat</name></json:item><json:item><name>M,D Norman</name></json:item></author><host><volume>66</volume><pages><last>136</last><first>125</first></pages><author></author><title>Earth and Planetary Science Letters</title><publicationDate>1996</publicationDate></host><title>Two mantlelandic volcanics</title><publicationDate>1996</publicationDate></json:item><json:item><author><json:item><name>T,J Hawaiian Picrites Inferred From Correlated Dunai</name></json:item><json:item><name>H Baur</name></json:item></author><host><volume>381</volume><pages><last>224</last><first>221</first></pages><issue>59</issue><author></author><title>Nature Geochimica et Cosmochimica Acta</title><publicationDate>1995</publicationDate></host><title>Helium, neon, and argon systematics Os–Pb isotopes of the European subcontinental mantle: implications for its geo Depleted spinel chemical evolution</title><publicationDate>1995</publicationDate></json:item><json:item><author><json:item><name> Harzburgite Xenoliths In Tertiary Dykes From East Greenland</name></json:item><json:item><name>J,M Eiler</name></json:item><json:item><name>K,A Farley</name></json:item><json:item><name>E,M Stolper</name></json:item></author><host><volume>154</volume><pages><last>235</last><first>221</first></pages><issue>62</issue><author></author><title>Geochimica et Cosmochimica Acta</title><publicationDate>1998</publicationDate></host><title>Correlated restites from high-degree melting. 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technologies</json:string><json:string>energy</json:string></scienceMetrix></categories><publicationDate>2003</publicationDate><copyrightDate>2003</copyrightDate><doi><json:string>10.1093/petrology/44.2.279</json:string></doi><id>6694C609F4D985F166A6324B9F50F183BC054163</id><score>0.09217587</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/6694C609F4D985F166A6324B9F50F183BC054163/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/6694C609F4D985F166A6324B9F50F183BC054163/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/6694C609F4D985F166A6324B9F50F183BC054163/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up</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>Oxford University Press</publisher><availability><p>Oxford University Press</p></availability><date>2003</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up</title><author xml:id="author-1"><persName><forename type="first">D. W.</forename><surname>PEATE</surname></persName><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation></author><author xml:id="author-2"><persName><forename type="first">J. A.</forename><surname>BAKER</surname></persName><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation></author><author xml:id="author-3"><persName><forename type="first">J.</forename><surname>BLICHERT-TOFT</surname></persName><affiliation>LABORATOIRE DES SCIENCES DE LA TERRE, ÉCOLE NORMALE SUPÉRIEURE DE LYON, 46 ALLÉE D’ITALIE, 69364 LYON CEDEX 7, FRANCE</affiliation></author><author xml:id="author-4"><persName><forename type="first">D. R.</forename><surname>HILTON</surname></persName><affiliation>GEOSCIENCES RESEARCH DIVISION, SCRIPPS INSTITUTION OF OCEANOGRAPHY, LA JOLLA, CA 92093-0220, USA</affiliation></author><author xml:id="author-5"><persName><forename type="first">M.</forename><surname>STOREY</surname></persName><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation></author><author xml:id="author-6"><persName><forename type="first">A. J. R.</forename><surname>KENT</surname></persName><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation></author><author xml:id="author-7"><persName><forename type="first">C. K.</forename><surname>BROOKS</surname></persName><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><affiliation>GEOLOGICAL INSTITUTE, UNIVERSITY OF COPENHAGEN, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation></author><author xml:id="author-8"><persName><forename type="first">H.</forename><surname>HANSEN</surname></persName><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation></author><author xml:id="author-9"><persName><forename type="first">A. K.</forename><surname>PEDERSEN</surname></persName><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><affiliation>GEOLOGICAL MUSEUM, ØSTER VOLDGADE 5, DK-1350 COPENHAGEN K, DENMARK</affiliation></author><author xml:id="author-10"><persName><forename type="first">R. A.</forename><surname>DUNCAN</surname></persName><affiliation>COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA</affiliation></author></analytic><monogr><title level="j">Journal of Petrology</title><title level="j" type="abbrev">J. Petrology</title><idno type="pISSN">0022-3530</idno><idno type="eISSN">1460-2415</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2003-02"></date><biblScope unit="volume">44</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="279">279</biblScope><biblScope unit="page" to="304">304</biblScope></imprint></monogr><idno type="istex">6694C609F4D985F166A6324B9F50F183BC054163</idno><idno type="DOI">10.1093/petrology/44.2.279</idno><idno type="local">112</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2003</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>We present elemental and isotopic (Sr–Nd–Pb–Hf–Os–He) data on primitive alkalic lavas from the Prinsen af Wales Bjerge, East Greenland. Stratigraphical, compositional and 40Ar–39Ar data indicate that this inland alkalic activity was contemporaneous with the upper parts of the main tholeiitic plateau basalts and also post-dated them. The alkalic rocks show a marked crustal influence, indicating establishment of new magmatic plumbing systems distinct from the long-lived coastal systems that fed the relatively uncontaminated plateau basalts. The least contaminated lavas have high 3He/4He isotope ratios (R/RA 12·4–18·5), sub-chondritic 187Os/188Osi (0·120–0·126), low εNdi (∼+4) and εHfi (∼+6) that plot below the ‘Nd–Hf mantle array’, and trace element characteristics similar to HIMU ocean island basalt (OIB). The uncontaminated magma is inferred to have more radiogenic 206Pb/204Pb values (>19·2) than the plateau basalts and Icelandic basalts, and thus represents a possible ‘enriched’ component to explain the compositional variations within the plateau basalts. One model to explain these compositional features is preferential melting of recycled material within the plume upwelling beneath the thick lithospheric cap, with 3He contributed from volatile-rich fluids from elsewhere in the Icelandic plume. The exact nature of the recycled component is not yet resolved, although Hf isotope compositions rule out any significant role for recycled pelagic sediment, and the low 187Os/188Os limits the participation of recycled basaltic material and argues instead for a contribution from the mantle section of the recycled slab.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>KWD</head><item><term>alkalic lavas</term></item><item><term>flood basalts</term></item><item><term>high 3He/4He</term></item><item><term>East Greenland</term></item><item><term>recycled lithosphere</term></item><item><term>Iceland plume</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2003-02">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-12-22">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/6694C609F4D985F166A6324B9F50F183BC054163/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus oup" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="US-ASCII"</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD Journal Publishing DTD v2.3 20070202//EN" URI="journalpublishing.dtd" name="istex:docType"></istex:docType><istex:document><article xml:lang="en" article-type="research-article"><front><journal-meta><journal-id journal-id-type="hwp">petrology</journal-id><journal-id journal-id-type="nlm-ta">J Petrology</journal-id><journal-id journal-id-type="publisher-id">petroj</journal-id><journal-title>Journal of Petrology</journal-title><abbrev-journal-title abbrev-type="publisher">J. Petrology</abbrev-journal-title><issn pub-type="ppub">0022-3530</issn><issn pub-type="epub">1460-2415</issn><publisher><publisher-name>Oxford University Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="other">112</article-id><article-id pub-id-type="doi">10.1093/petrology/44.2.279</article-id><article-categories><subj-group subj-group-type="heading"><subject>ARTICLE</subject></subj-group></article-categories><title-group><article-title>The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>PEATE</surname><given-names>D. W.</given-names></name><xref rid="AFF1">1</xref><xref rid="FN1">*</xref></contrib><contrib contrib-type="author"><name><surname>BAKER</surname><given-names>J. A.</given-names></name><xref rid="AFF1">1</xref></contrib><contrib contrib-type="author"><name><surname>BLICHERT-TOFT</surname><given-names>J.</given-names></name><xref rid="AFF2">2</xref></contrib><contrib contrib-type="author"><name><surname>HILTON</surname><given-names>D. R.</given-names></name><xref rid="AFF3">3</xref></contrib><contrib contrib-type="author"><name><surname>STOREY</surname><given-names>M.</given-names></name><xref rid="AFF1">1</xref></contrib><contrib contrib-type="author"><name><surname>KENT</surname><given-names>A. J. R.</given-names></name><xref rid="AFF1">1</xref><xref rid="FN2">†</xref></contrib><contrib contrib-type="author"><name><surname>BROOKS</surname><given-names>C. K.</given-names></name><xref rid="AFF1">1</xref><xref rid="AFF4">4</xref></contrib><contrib contrib-type="author"><name><surname>HANSEN</surname><given-names>H.</given-names></name><xref rid="AFF1">1</xref><xref rid="FN3">‡</xref></contrib><contrib contrib-type="author"><name><surname>PEDERSEN</surname><given-names>A. K.</given-names></name><xref rid="AFF1">1</xref><xref rid="AFF5">5</xref></contrib><contrib contrib-type="author"><name><surname>DUNCAN</surname><given-names>R. A.</given-names></name><xref rid="AFF6">6</xref></contrib><aff id="AFF1"><sup>1</sup>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</aff><aff id="AFF2"><sup>2</sup>LABORATOIRE DES SCIENCES DE LA TERRE, ÉCOLE NORMALE SUPÉRIEURE DE LYON, 46 ALLÉE D’ITALIE, 69364 LYON CEDEX 7, FRANCE</aff><aff id="AFF3"><sup>3</sup>GEOSCIENCES RESEARCH DIVISION, SCRIPPS INSTITUTION OF OCEANOGRAPHY, LA JOLLA, CA 92093-0220, USA</aff><aff id="AFF4"><sup>4</sup>GEOLOGICAL INSTITUTE, UNIVERSITY OF COPENHAGEN, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</aff><aff id="AFF5"><sup>5</sup>GEOLOGICAL MUSEUM, ØSTER VOLDGADE 5, DK-1350 COPENHAGEN K, DENMARK</aff><aff id="AFF6"><sup>6</sup>COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA</aff></contrib-group><pub-date pub-type="ppub"><month>02</month><year>2003</year></pub-date><volume>44</volume><issue>2</issue><fpage>279</fpage><lpage>304</lpage><history><date date-type="accepted"><day>08</day><month>08</month><year>2002</year></date><date date-type="received"><day>01</day><month>11</month><year>2001</year></date></history><permissions><copyright-statement>Oxford University Press</copyright-statement><copyright-year>2003</copyright-year></permissions><abstract xml:lang="en"><p>We present elemental and isotopic (Sr–Nd–Pb–Hf–Os–He) data on primitive alkalic lavas from the Prinsen af Wales Bjerge, East Greenland. Stratigraphical, compositional and <sup><italic>40</italic></sup>Ar–<sup><italic>39</italic></sup>Ar data indicate that this inland alkalic activity was contemporaneous with the upper parts of the main tholeiitic plateau basalts and also post-dated them. The alkalic rocks show a marked crustal influence, indicating establishment of new magmatic plumbing systems distinct from the long-lived coastal systems that fed the relatively uncontaminated plateau basalts. The least contaminated lavas have high <sup><italic>3</italic></sup>He/<sup><italic>4</italic></sup>He isotope ratios (R/R<sub><italic>A</italic></sub> 12·4–18·5), sub-chondritic <sup><italic>187</italic></sup>Os/<sup><italic>188</italic></sup>Os<sub><italic>i</italic></sub> (0·120–0·126), low εNd<sub><italic>i</italic></sub> (∼+4) and εHf<sub><italic>i</italic></sub> (∼+6) that plot below the ‘Nd–Hf mantle array’, and trace element characteristics similar to HIMU ocean island basalt (OIB). The uncontaminated magma is inferred to have more radiogenic <sup><italic>206</italic></sup>Pb/<sup><italic>204</italic></sup>Pb values (>19·2) than the plateau basalts and Icelandic basalts, and thus represents a possible ‘enriched’ component to explain the compositional variations within the plateau basalts. One model to explain these compositional features is preferential melting of recycled material within the plume upwelling beneath the thick lithospheric cap, with <sup><italic>3</italic></sup>He contributed from volatile-rich fluids from elsewhere in the Icelandic plume. The exact nature of the recycled component is not yet resolved, although Hf isotope compositions rule out any significant role for recycled pelagic sediment, and the low <sup><italic>187</italic></sup>Os/<sup><italic>188</italic></sup>Os limits the participation of recycled basaltic material and argues instead for a contribution from the mantle section of the recycled slab.</p></abstract><kwd-group kwd-group-type="KWD" xml:lang="en"><kwd>alkalic lavas</kwd><kwd>flood basalts</kwd><kwd>high <sup>3</sup>He/<sup>4</sup>He</kwd><kwd>East Greenland</kwd><kwd>recycled lithosphere</kwd><kwd>Iceland plume</kwd></kwd-group><custom-meta-wrap><custom-meta><meta-name>hwp-legacy-fpage</meta-name><meta-value>279</meta-value></custom-meta><custom-meta><meta-name>hwp-legacy-dochead</meta-name><meta-value>ARTICLE</meta-value></custom-meta></custom-meta-wrap></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>The Prinsen af Wales Bjerge Formation Lavas, East Greenland: the Transition from Tholeiitic to Alkalic Magmatism during Palaeogene Continental Break-up</title></titleInfo><name type="personal"><namePart type="given">D. W.</namePart><namePart type="family">PEATE</namePart><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J. A.</namePart><namePart type="family">BAKER</namePart><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">BLICHERT-TOFT</namePart><affiliation>LABORATOIRE DES SCIENCES DE LA TERRE, ÉCOLE NORMALE SUPÉRIEURE DE LYON, 46 ALLÉE D’ITALIE, 69364 LYON CEDEX 7, FRANCE</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">D. R.</namePart><namePart type="family">HILTON</namePart><affiliation>GEOSCIENCES RESEARCH DIVISION, SCRIPPS INSTITUTION OF OCEANOGRAPHY, LA JOLLA, CA 92093-0220, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">STOREY</namePart><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A. J. R.</namePart><namePart type="family">KENT</namePart><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C. K.</namePart><namePart type="family">BROOKS</namePart><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><affiliation>GEOLOGICAL INSTITUTE, UNIVERSITY OF COPENHAGEN, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="family">HANSEN</namePart><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A. K.</namePart><namePart type="family">PEDERSEN</namePart><affiliation>DANISH LITHOSPHERE CENTRE, ØSTER VOLDGADE 10-L, DK-1350 COPENHAGEN K, DENMARK</affiliation><affiliation>GEOLOGICAL MUSEUM, ØSTER VOLDGADE 5, DK-1350 COPENHAGEN K, DENMARK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R. A.</namePart><namePart type="family">DUNCAN</namePart><affiliation>COLLEGE OF OCEANIC AND ATMOSPHERIC SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR 97331, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article"></genre><originInfo><publisher>Oxford University Press</publisher><dateIssued encoding="w3cdtf">2003-02</dateIssued><copyrightDate encoding="w3cdtf">2003</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">We present elemental and isotopic (Sr–Nd–Pb–Hf–Os–He) data on primitive alkalic lavas from the Prinsen af Wales Bjerge, East Greenland. Stratigraphical, compositional and 40Ar–39Ar data indicate that this inland alkalic activity was contemporaneous with the upper parts of the main tholeiitic plateau basalts and also post-dated them. The alkalic rocks show a marked crustal influence, indicating establishment of new magmatic plumbing systems distinct from the long-lived coastal systems that fed the relatively uncontaminated plateau basalts. The least contaminated lavas have high 3He/4He isotope ratios (R/RA 12·4–18·5), sub-chondritic 187Os/188Osi (0·120–0·126), low εNdi (∼+4) and εHfi (∼+6) that plot below the ‘Nd–Hf mantle array’, and trace element characteristics similar to HIMU ocean island basalt (OIB). The uncontaminated magma is inferred to have more radiogenic 206Pb/204Pb values (>19·2) than the plateau basalts and Icelandic basalts, and thus represents a possible ‘enriched’ component to explain the compositional variations within the plateau basalts. One model to explain these compositional features is preferential melting of recycled material within the plume upwelling beneath the thick lithospheric cap, with 3He contributed from volatile-rich fluids from elsewhere in the Icelandic plume. The exact nature of the recycled component is not yet resolved, although Hf isotope compositions rule out any significant role for recycled pelagic sediment, and the low 187Os/188Os limits the participation of recycled basaltic material and argues instead for a contribution from the mantle section of the recycled slab.</abstract><subject lang="en"><genre>KWD</genre><topic>alkalic lavas</topic><topic>flood basalts</topic><topic>high 3He/4He</topic><topic>East Greenland</topic><topic>recycled lithosphere</topic><topic>Iceland plume</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Petrology</title></titleInfo><titleInfo type="abbreviated"><title>J. Petrology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0022-3530</identifier><identifier type="eISSN">1460-2415</identifier><identifier type="PublisherID">petroj</identifier><identifier type="PublisherID-hwp">petrology</identifier><identifier type="PublisherID-nlm-ta">J Petrology</identifier><part><date>2003</date><detail type="volume"><caption>vol.</caption><number>44</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>279</start><end>304</end></extent></part></relatedItem><identifier type="istex">6694C609F4D985F166A6324B9F50F183BC054163</identifier><identifier type="DOI">10.1093/petrology/44.2.279</identifier><identifier type="local">112</identifier><accessCondition type="use and reproduction" contentType="copyright">Oxford University Press</accessCondition><recordInfo><recordContentSource>OUP</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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