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- W2007280192 abstract "Elemental abundances and isotopic compositions of He and Ne were determined by stepwise heating for a magnetic separate of deep-sea sediments and its 3 M HCl resistant fractions. High 3He/4He ratios (2–3×10−4) and solar 20Ne/22Ne ratios (12–14) were observed in all temperature fractions for these samples. The major release temperatures of 4He were at 1000°C, whereas 20Ne at 1200°C. These results suggest that solar He and Ne are tightly trapped inside the grains with nearly uniform isotopic ratios. The magnetic separate lost about 75% of its 3He against 37% weight loss during the 3 M HCl treatment, indicating that solar He and Ne are relatively enriched in the fine fraction and/or on the surface of magnetite grains. It is likely that the solar wind with its high energy tail is responsible for the extraterrestrial noble gases in deep-sea sediments. Alternatively, solar wind He and Ne were redistributed in the magnetite during atmospheric entry and tightly trapped inside the grains." @default.
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- W2007280192 date "1990-01-01" @default.
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- W2007280192 title "He and Ne isotopic studies on the extraterrestrial material in deep-sea sediments" @default.
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