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• W1969933946 abstract "[1] We evaluated He-Ne-Ar elemental compositions of mid-ocean ridge basalt (MORB) glasses and basalt glasses from the Hawaiian hot spot (Loihi Seamount, Kilauea) to determine the (3He/22Ne)solar, 4He*/21Ne*, and 4He*/40Ar* MORB-type and “plume”-type end-member compositions within a binary mixing model. Although the 3He/22Ne ratios of “plume” magma and MORB magma marginally agree with current estimates of solar compositions, the calculated 4He*/21Ne* ratios are lower than the theoretical production ratio and indicate that the “plume” magma component experienced a predegassing fractionation event. This fractionation event resulted in a deficit in both radiogenic 4He* and primordial 3He and accounts for the differences in 3He/22Ne, 4He*/21Ne*, and 4He*/40Ar* ratios and 3He concentrations for both mantle domains. This resolves an apparent contradiction previously termed “mantle He paradox,” though the derived 3He concentrations are also at odds with a primitive mantle concept that requires still higher concentrations. We propose that the primary fractionation of He/Ne and He/Ar ratios is related to a more compatible behavior of He relative to Ne, Ar during partial melting. One model is presented: at depths below a shallow MORB source region a rising mantle plume causes formation of low-degree partial melts, which are deficient in He. During melt ascent, these “plume”-derived melts mix with melts of the shallow (MORB-type) mantle source that experienced a higher degree of melting and hence show no He deficit. Depending on the relative proportion of mixing the resulting oceanic basalts will encompass the whole observed range from Loihi-type and MORB-type noble gas isotope compositions." @default.
• W1969933946 created "2016-06-24" @default.
• W1969933946 creator A5002929052 @default.
• W1969933946 creator A5054894445 @default.
• W1969933946 date "2008-03-01" @default.
• W1969933946 modified "2023-09-27" @default.
• W1969933946 title "Helium deficit in high-³He/⁴He parent magmas: Predegassing fractionation, not a “helium paradox”" @default.
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• W1969933946 doi "https://doi.org/10.1029/2007gc001833" @default.
• W1969933946 hasPublicationYear "2008" @default.
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