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- W2050201301 abstract "Based on the proposition that the Earth contains solar-like, nucleogenic and atmosphere-derived neon components, we calculate the amounts of solar-derived 22Nes and nucleogenic 21Ne∗ present in a sample. The amounts of 22Nes and 21Ne∗ can then be compared with the amounts of primordial 3He and radiogenic 4He. The 3He/22Nes and 4He/21Ne∗ ratios observed in basaltic glasses from mid-oceanic ridges (MORBs) vary by almost 2 orders of magnitude and define a linear correlation with a slope of unity which passes through the point defined by the mean primordial 3He/22Ne ratio in the Earth (= 7.7) and the radiogenic 4He to nucleogenic 21Ne production ratio (= 2.2 × 107). This indicates that there has been significant recent elemental fractionation which has enriched MORB glasses in both primordial 3He and radiogenic 4He with respect to mantle neon. A similar enrichment of helium in MORB glasses is observed relative to mantle-derived 40Ar∗. Importantly, there is a positive correlation between absolute helium abundance and the degree of helium enrichment. Specifically, the data show positive linear correlations in plots of [3He] vs. 3He/22Nes, [4He] vs. 4He/21Ne∗, and [4He] vs. 4He/40Ar∗. These positive correlations between helium abundance and elevated He/Ne and He/Ar ratios in MORB glasses are inconsistent with elemental fractionation associated with any form of solubility controlled gas loss process, as these would lead to negative correlations. Additionally there is relatively little fractionation of neon from argon. This observation excludes any type of simple mass dependent process. Rather, it requires some form of “threshold” fractionation process which effects only helium. Although the origin of the correlation between helium abundance and helium fractionation is unclear, we speculate that the systematic helium enrichment observed in MORB glasses may reflect preferentially concentrating helium liberated from the crystallising oceanic crustal section into the relatively small volume of residual magma that is erupted to form glasses." @default.
- W2050201301 created "2016-06-24" @default.
- W2050201301 creator A5082779568 @default.
- W2050201301 creator A5082896988 @default.
- W2050201301 date "1999-09-01" @default.
- W2050201301 modified "2023-09-27" @default.
- W2050201301 title "Systematic elemental fractionation of mantle-derived helium, neon, and argon in mid-oceanic ridge glasses" @default.
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- W2050201301 doi "https://doi.org/10.1016/s0016-7037(99)00206-9" @default.
- W2050201301 hasPublicationYear "1999" @default.
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