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Provedor de dados:  ArchiMer
País:  France
Título:  Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea
Autores:  Fourre, E
Jean Baptiste, P
Charlou, Jean-luc
Donval, Jean-pierre
Ishibashi, J
Data:  2006-06
Ano:  2006
Palavras-chave:  Western Pacific
Manus Basin
Back arc basins
Hydrothermal fluids
Helium isotopes
Resumo:  We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with He-3/He-4 values (7.4 to 7.9 R-a) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 +/- 0.1 R-a) are observed. The causal link between the narrow spatial extent of the He-3/He-4 anomaly at the MSC and a He-3-rich deep mantle component remains elusive, based on available geophysical data. Thus, the Manus Spreading Center results may be an interesting example of small scale upper-mantle heterogeneity.
Tipo:  Text
Idioma:  Inglês

Editor:  Terrapub
Formato:  application/pdf
Fonte:  Geochemical Journal (0016-7002) (Terrapub), 2006-06 , Vol. 40 , N. 3 , P. 245-252
Direitos:  2006 by The Geochemical Society of Japan, Terrapub


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