During Devonian pulse of alkaline magmatism 370 Ma ago 18 ultrabasic-alkaline-carbonatite complexes were formed on the Kola Peninsula. Rare gas isotope abundances were studied in ~300 samples from 8 complexes and also from Devonian dikes. A comparison of expected from in-situ closed-system production calc and measured meas abundances has shown that 4He meas 4Hecalc whereas in some rocks and minerals 3Hemeas exceeded 3Hecalc up to 1,000 times indicating occurrence of a mantle fluid in a majority of samples. Gas extraction liberated fluid-related helium with as low 4He/3He ratios as 3 x 104. These values show a contribution of 3He-rich plume-like component. A reason for highly variable 4He/3He ratios is not well understood yet. Isotope composition of Ne supports the occurrence of plume component: 20Ne/22Ne ratio varies from 10.4 to 12.0 and 20Ne/22Ne versus 21Ne/22Ne correlation is quite similar to that observed for Loihi hot spot, Hawaii. A comparison of these data with rare gas systematic in the mantle enable us to suggest a contribution of material from the less degassed deep mantle reservoir, source of primordial rare gases, to Devonian ultrabasic-alkaline and carbonatite rocks on the Kola Peninsula.
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