source enrichment processes reponsible for isotopic anomalies in oceanic island basalt
A new method has been developed to separate the compositional variations in ocean island basalts into those that result from variations in source composition and from the melting process itself. The approach depends on correlations between isotope ratios, which can only come from source inhomogeneit...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://hal.science/hal-00102033 https://doi.org/10.1016/j.gca.2003.10.029 |
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ftunivlyon:oai:HAL:hal-00102033v1 2023-06-11T04:13:10+02:00 source enrichment processes reponsible for isotopic anomalies in oceanic island basalt Mckenzie*, Dan Stracke, Andreas Blichert-Toft, Janne Albarède, Francis Grönvold, Karl Keith O'Nions, R. Laboratoire de Sciences de la Terre (LST) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2004 https://hal.science/hal-00102033 https://doi.org/10.1016/j.gca.2003.10.029 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2003.10.029 hal-00102033 https://hal.science/hal-00102033 doi:10.1016/j.gca.2003.10.029 ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-00102033 Geochimica et Cosmochimica Acta, 2004, 68, pp.2699-2724. ⟨10.1016/j.gca.2003.10.029⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2004 ftunivlyon https://doi.org/10.1016/j.gca.2003.10.029 2023-04-26T05:03:25Z A new method has been developed to separate the compositional variations in ocean island basalts into those that result from variations in source composition and from the melting process itself. The approach depends on correlations between isotope ratios, which can only come from source inhomogeneities, and elemental concentrations. Analysis of three data sets shows that the inhomogeneities beneath Theistareykir, in NE Iceland, Kilauea and Pitcairn can be produced by subduction of oceanic islands and volcanic ridges. The thicknesses of the lithosphere on which such islands were constructed and potential temperatures of the plumes that produced them can be estimated from the geochemical observations. Model ages are harder to determine, though simple assumptions give about 400 Ma for the Theistareykir source and 1.2 Ga for Kilauea. The model may also provide a physical explanation for the commonly used isotopic classification of ocean island basalts, with the isotopic composition changing from HIMU through EMII to EMI as the melt fraction increases. These results have been obtained from a small number of data sets obtained from ocean island basalts erupted in small areas during short time intervals. More such observations are needed to discover whether geochemical observations from other islands are consistent with the same model. Article in Journal/Newspaper Iceland Ocean Island Université de Lyon: HAL Geochimica et Cosmochimica Acta 68 12 2699 2724 |
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Open Polar |
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Université de Lyon: HAL |
op_collection_id |
ftunivlyon |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Mckenzie*, Dan Stracke, Andreas Blichert-Toft, Janne Albarède, Francis Grönvold, Karl Keith O'Nions, R. source enrichment processes reponsible for isotopic anomalies in oceanic island basalt |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
A new method has been developed to separate the compositional variations in ocean island basalts into those that result from variations in source composition and from the melting process itself. The approach depends on correlations between isotope ratios, which can only come from source inhomogeneities, and elemental concentrations. Analysis of three data sets shows that the inhomogeneities beneath Theistareykir, in NE Iceland, Kilauea and Pitcairn can be produced by subduction of oceanic islands and volcanic ridges. The thicknesses of the lithosphere on which such islands were constructed and potential temperatures of the plumes that produced them can be estimated from the geochemical observations. Model ages are harder to determine, though simple assumptions give about 400 Ma for the Theistareykir source and 1.2 Ga for Kilauea. The model may also provide a physical explanation for the commonly used isotopic classification of ocean island basalts, with the isotopic composition changing from HIMU through EMII to EMI as the melt fraction increases. These results have been obtained from a small number of data sets obtained from ocean island basalts erupted in small areas during short time intervals. More such observations are needed to discover whether geochemical observations from other islands are consistent with the same model. |
author2 |
Laboratoire de Sciences de la Terre (LST) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Mckenzie*, Dan Stracke, Andreas Blichert-Toft, Janne Albarède, Francis Grönvold, Karl Keith O'Nions, R. |
author_facet |
Mckenzie*, Dan Stracke, Andreas Blichert-Toft, Janne Albarède, Francis Grönvold, Karl Keith O'Nions, R. |
author_sort |
Mckenzie*, Dan |
title |
source enrichment processes reponsible for isotopic anomalies in oceanic island basalt |
title_short |
source enrichment processes reponsible for isotopic anomalies in oceanic island basalt |
title_full |
source enrichment processes reponsible for isotopic anomalies in oceanic island basalt |
title_fullStr |
source enrichment processes reponsible for isotopic anomalies in oceanic island basalt |
title_full_unstemmed |
source enrichment processes reponsible for isotopic anomalies in oceanic island basalt |
title_sort |
source enrichment processes reponsible for isotopic anomalies in oceanic island basalt |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00102033 https://doi.org/10.1016/j.gca.2003.10.029 |
genre |
Iceland Ocean Island |
genre_facet |
Iceland Ocean Island |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-00102033 Geochimica et Cosmochimica Acta, 2004, 68, pp.2699-2724. ⟨10.1016/j.gca.2003.10.029⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2003.10.029 hal-00102033 https://hal.science/hal-00102033 doi:10.1016/j.gca.2003.10.029 |
op_doi |
https://doi.org/10.1016/j.gca.2003.10.029 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
68 |
container_issue |
12 |
container_start_page |
2699 |
op_container_end_page |
2724 |
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1768389890869821440 |