fig12.htm

Figure 12. Comparison of measured (m) abundances of 4He and 3He and those calculated (c) assuming closed system evolution.
While 4He(m)/ 4He(c) ratios are similar to or less than 1 in all samples, a great excess of 3He(m) is observed implying a contribution of mantle fluid retained by almost all samples. Carbonatites and alkaline rocks from Khibiny show small excess of 3He in contrast to ultrabasic rocks and carbonatites from Kovdor and Seblyavr. Av - the average values, Me- the medians.


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