Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2401a&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 16, p. 2401-2404
Physics
10
Geochemistry, Geochemistry: Composition Of The Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes
Scientific paper
An unbiased estimate of the arithmetic mean of the 3He/4He ratio (R) of basalts from the global spreading ridge system is 9.14+/-3.59Ra (n=503), where Ra is the atmospheric ratio and n is the number of data points. The +/- two standard deviation (2σ) 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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