fig24.htm

Figure 24. A comparison of primordial and radiogenic He and Ne isotope abundances in samples from Kola UACC, MORB and OIB.
While the 4He*/21Ne* production ratio is almost constant, this ratio and the ratio between primordial species vary within a great range which can be approximated by a straight line. Projection of the production ratio via the approximation line to the primordial ratio indicates 3He/22 Ne similar to the actual solar value implying solar- like 3He/22Ne in the mantle before the fractionation. Possible mechanisms responsible for the fractionation are discussed in the text.


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