The issue of recycling volatile elements back into the mantle is a leitmotif of geochemistry. Carbon, water and perhaps even the halogens are often identified as volatile elements which are recycled into the mantle, with their current abundances possibly at steady state, e.g., where recycled and degassing fluxes are equal (Jambon, 1994). Of course, the question arises, what about the noble gases? The one major difference is that they are chemically inert and do not form phases by themselves, in contrast to, for example, CO2, the key constituent of carbonate. The second obvious question that arises is,...

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