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- W2040799467 abstract "The magnitude of the excess of helium, ΔC(He), generally present in waters of the Pacific Ocean and, attributed to an influx of He through the sediment-water interface, is given by 4.3 × 1010 < ΔC(He) < 7.5 × 1010 atoms/cm³ of water. An average flux, F(He), is estimated from a simple model that assumes horizontal transport in a well mixed bottom layer, and vertical transport by advection in the water above. A value for the flux 1.9 × 106 < F(He) < 3.2 × 106 atoms/cm² sec results. A flux of this order, both relative to He³ and absolute, suggests an ionic escape mechanism for the exosphere. A comparison of the flux with the generation of He by U and Th in an oceanic crust reveals that most of the He must be derived from the mantle (∼99%), and calculations for different compositional models are in agreement with a nonchondritic earth (K/U = 1 × 104;). An elevated flux of He was found on the crest of the east Pacific rise, suggesting that the He must be transported by upward movements in the mantle material." @default.
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- W2040799467 date "1967-05-15" @default.
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- W2040799467 title "Geophysical implications of the excess helium found in Pacific waters" @default.
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