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Helium isotopes at the Rainbow hydrothermal site (Mid-Atlantic Ridge, 36 degrees 14 ' N) ArchiMer
Jean Baptiste, Philippe; Fourre, Elise; Charlou, Jean-luc; German, Christopher; Radford Knoery, Joel.
The He-3/He-4 ratio and helium concentration have been measured in the vent fluids and the dispersing plume of the Rainbow hydrothermal site, on the Mid-Atlantic Ridge (MAR). The He-3/He-4 ratio (7.51 R-a) and He-3 end-member concentration (25 pmol/kg) are in the range of observed values elsewhere on mid-ocean ridges, pointing to the relative homogeneity of the upper mantle with respect to helium isotope geochemistry. He-3 is linearly correlated with methane and manganese throughout the plume, with CH4/He-3 and Mn/He-3 ratios identical to those measured in the hot fluids. The bulk residence time of the plume in the rift valley estimated from the plume He-3 budget is similar to20 days. The He-3 flux transported by the plume, calculated from current-meter...
Tipo: Text Palavras-chave: Mid Atlantic Ridge; Heat flux; Isotopes; Hydrothermal vents; Helium.
Ano: 2004 URL:
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