| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Sr‐Nd‐Hf isotopes along the Pacific Antarctic Ridge from 41 to 53°S
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| Autores: |
Hamelin, Cedric
Dosso, Laure
Hanan, Barry
Barrat, Jean-alix
Ondreas, Helene
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| Data: |
2010-05-19
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| Ano: |
2010
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| Palavras-chave: |
Pacific-Antarctic
Depleted mantle
Sr-Nd-Hf isotopes
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| Resumo: |
Major, trace element and Sr-Nd-Hf isotope data in basalts collected along the Pacific-Antarctic Ridge ( PAR) axis between 53 and 41 S, far from any hotspot influence, reveal tight coherent geochemical variations within the depleted MORB mantle. All samples are located below the Pacific reference line defining two sub-oceanic mantle domains on each side of the Easter microplate. The data extend the PAR 66-53 S field towards more radiogenic Sr (0.70264), less radiogenic Nd (epsilon = 7.7) and Hf (epsilon = 11.4) values. The along ridge geochemical variability is closely related to the morphological segmentation of the ridge. Anomalous geochemical features are attributed to the atypical morphology of two segments due to the presence of off-axis magmatism. The first order ridge discontinuity defined by the Menard transform fault separates two slightly different mantle domains, each with its own history.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00004/11526/8123.pdf
DOI:10.1029/2010GL042979
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| Editor: |
American Geophysical Union
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| Relação: |
http://archimer.ifremer.fr/doc/00004/11526/
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| Formato: |
application/pdf
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| Fonte: |
Geophysical Research Letters (0094-8276) (American Geophysical Union), 2010-05-19 , Vol. 37 , N. L10303 , P. 1-5
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| Direitos: |
Copyright 2010 by the American Geophysical Union.
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