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Detailed Reference Information |
Takahata, N., Agarwal, M., Nishizawa, M., Shirai, K., Inoue, Y. and Sano, Y. (2005). Helium-3 plume over the East Pacific Rise at 25°S. Geophysical Research Letters 32: doi: 10.1029/2005GL023076. issn: 0094-8276. |
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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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Abstract |
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Keywords
Geochemistry, Stable isotope geochemistry (0454, 4870), Geochemistry, Marine geochemistry (4835, 4845, 4850), Oceanography, Biological and Chemical, Chemical tracers |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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