On the origins of trapped helium,neon and argon isotopic variations in meteorites—II. Carbonaceous meteorites

Data are presented from stepwise heating experiments on five carbonaceous chondrites: Alais, Ivuna, Orgueil, Cold Bokkeveld and Nogoya. The data indicate the presence of two isotopically distinct major trapped components, components A and B. Two additional components, ‘C’ and ‘E,’ were isolated on the basis of neon isotopic structure. Components B and C, found in. gas-rich meteorites, are attributed to ion implantation by the present day solar wind and solar flares respectively. Component A is interpreted as a mixture of component E and component D (Paper I), where component D is identified with the primitive solar wind and component E is assigned an extra solar system origin.