Potassium analyzed using an IL 343 digital flame photometer using LiBO2 flux fusion technique and mineral calibration standards (Suhr and Ingamells, 1966; Ingamells, 1970; Engles and ingamells, 1970). Argon determined by isotope dilution using 38Ar tracers and 6-in. radius Nuclide mass spectrometer equipped with automated peak stepping and digital data acquisition systems.