| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Helium isotopes on the Pacific-Antarctic ridge (52.5°–41.5°S)
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| Autores: |
Moreira, M
Dosso, Laure
Ondreas, Helene
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| Data: |
2008-05
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| Ano: |
2008
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| Palavras-chave: |
Pacific Antarctic ridge
Mantle geochemistry
Helium isotopes
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| Resumo: |
The first isotopic data and concentrations of helium are reported for the Pacific-Antarctic ridge between 52.5 degrees S and 41.5 degrees S. The He-4/He-3 ratio is extremely homogeneous over more than 1200 km, with a mean ratio of 99,275 (R/Ra = 7.29) and a standard deviation of 2719 (0.19), which is the lowest dispersion observed for the global mid oceanic ridge system. Moreover, the Menard T. F. is a frontier between two mantles with slightly different helium isotopic ratios (96,595 +/- 1520 and 100,347 +/- 2330). No difference in the helium concentration between the two ridge segments defined by the Menard T. F. can be observed, as well as no significant difference in the U and Th contents suggesting that the difference in helium isotopic ratio is old (>500 My) and may represent a slight difference in degassing or/and trace element depletion history.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2008/publication-4348.pdf
DOI:10.1029/2008GL033286
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| Editor: |
American Geophysical Union
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| Relação: |
http://archimer.ifremer.fr/doc/00000/4348/
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| Formato: |
application/pdf
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| Fonte: |
Geophysical Research Letters (0094-8276) (American Geophysical Union), 2008-05 , Vol. 35 , N. 10 , P. NIL_49-NIL_54
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| Direitos: |
2008 American Geophysical Union
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