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Anderson 2000

Anderson, D.L. (2000). The Statistics of Helium Isotopes Along the Global Spreading Ridge System and the Central Limit Theorem. Geophysical Research Letters 27: doi: 10.1029/1999GL008476. issn: 0094-8276.

An unbiased estimate of the arithmetic mean of the He-3/He-4 ratio (R) of basalts from the global spreading ridge system is 9.14 +/- 3.59 Pa (n=503), where Pa is the atmospheric ratio and n is the number of data points. The +/- two standard deviation (2 sigma) range covers much of the oceanic island and continental flood basalt data that have been attributed to 'plume' or 'lower mantle' components. The highest R values along the ridge system are associated with new ridges, backarc basins and near-ridge seamounts. Low values are associated with long-lived or abandoned ridges. The median, a more robust measure of the average, is 8.51 Ra.

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Keywords
Geochemistry, Geochemistry, Composition of the mantle, Tectonophysics, Dynamics of lithosphere and mantle—general, Tectonophysics, Dynamics, convection currents and mantle plumes

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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