Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea
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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 <sup>3</sup>He/<sup>4</sup>He values (7.4 to 7.9 R<sub>a</sub>) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 ± 0.1 R<sub>a</sub>) are observed. The causal link between the narrow spatial extent of the <sup>3</sup>He/<sup>4</sup>He anomaly at the MSC and a <sup>3</sup>He-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.
- Geochem. J.
Geochem. J. 40(3), 245-252, 2006-06-01
GEOCHEMICAL SOCIETY OF JAPAN