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- W2024169818 abstract "Combined laser extraction and manometric-quadrupole-mass spectroscopic measurements permit the simultaneous analysis of CO2, He and Ar in selected fluid inclusion generations trapped in a dunite nodule from Reunion Island. Variations in 40Ar36Ar in primary fluid inclusions (1000–8500) implies that atmospheric Ar is present in all the trapped fluids, possibly introduced by percolation of seawater into the magma from which the olivine crystallised. Later inclusion generations have lower 40Ar36Ar (500–3500). CO23He ratios ((1–9.6) × 109) are at the lower range of reported values from high 3He4He xenoliths ((1–20) × 109) but show no systematic variation with inclusion generation. 4He40Ar∗ values are constant (2.4 ± 0.1) for all inclusion generations and over wide ranges in CO2He ((0.2–8.2) × 105). This is not consistent with the relative solubilities of CO2, He and Ar in basaltic melts but implies that ƒCO2 is determined by some other process, possibly the partitioning of CO2 into an immiscible phase.Mixing between high 3He4He, high He abundance mantle (primitive He mantle) with a degassed and incompatible element enriched component can generate the coupled high 3He4He-radiogenic Sr and Pb isotopic compositions of Reunion lavas. The range in C3He likely for the primitive He mantle ((1–20) × 109) spans the estimated C3He of chondrites (≈ 2 × 109). The primitive He component cannot represent undegassed primitive mantle as the C36Ar values of Reunion (> 1 × 109) are higher than those of chondrites (8 × 107)." @default.
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- W2024169818 date "1994-12-01" @default.
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- W2024169818 title "CHeAr variations within a dunite nodule as a function of fluid inclusion morphology" @default.
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- W2024169818 doi "https://doi.org/10.1016/0012-821x(94)90148-1" @default.
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