Is there solar argon in the Earth's mantle?

Pepin1 suggests, mainly on the basis of three studies2,3,4, that solar argon, krypton and xenon might be present in the Earth's mantle. But I believe that the analytical evidence is still too weak to claim such a breakthrough in rare-gas geochemistry. Moreover, other studies5,6,7,8, and the new data I report here, indicate that solar argon, krypton and xenon, if present at all, are only a minor constituent of mantle rare gases.