Die Produktionsraten von 36Cl und 39Ar in Metall- und Steinphase des Chondriten Leedey

Abstract

The production rates of 36Cl and 39Ar by the cosmic radiation on Fe and Ca +K have been determined in the chondrite Leedey. The values of 19.4 atoms/min · kg ≦ PFe (36Cl) ≦ 26.6 atoms/min · kg and PFe (39Ar) = (23.6 ± 1.8) atoms/min · kg are in good agreement with those found in iron meteorites of comparable size. A large contribution of Ca+K to the production of both isotopes is indicated by the ratios 9.2 ≦ PCa + K (36Cl) /PFe (36Cl) ≦ 13.6 and PCa + K (39Ar) /PFe (39Ar) = 12.1 ± 1.6. The bearing of these results on the interpretation of 39Ar-data obtained on other chondrites is being discussed.