Helium-3 plume over the East Pacific Rise at 25°S

Details Helium-3 plume over the East Pacific Rise at 25°S Helium-3 plume over the East Pacific Rise at 25°S

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3211608t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 11, CiteID L11608

Mathematics

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2

Geochemistry: Stable Isotope Geochemistry (0454, 4870), Geochemistry: Marine Geochemistry (4835, 4845, 4850), Oceanography: Biological And Chemical: Chemical Tracers

Scientific paper

We have measured helium isotopic ratios of sixty-eight water samples collected in the southeastern Pacific at 25°S. The maximum excess 3He of 47.5% is observed just above the East Pacific Rise, which is comparable to that of 50.5% at 15°S in literature. A negative correlation between helium isotopes and neon to helium ratios of seawater samples suggests that the source of excess helium-3 in the mid-depth water is considered to be a MORB-type mantle. Contour of excess 3He shows symmetrical pattern, that is, plume of 30% excess can be traced up to 1000 km on both east and west of the East Pacific Rise. This pattern is consistent with a northward flow along the rise at 25°S estimated by a physical model. Our observation also supports a flow pattern of deep ocean currents, which has been suggested by contour of excess 3He obtained from previous studies.

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