ABSTRACT

The cosmogenic xenon isotope patterns were calculated independently for each temperature fraction from Patwar and also for the Estherville mesosiderite data of KAISER and RAJAN. A distinct correlation with temperature was observed which is comparable to other results on achondrites and lunar materials. These spallation product compositional variations appear to depend on target and energy variations. Cosmogenic yields of ¹²⁹Xe are also distinctly correlated, suggesting an insignificant contribution of radiogenic ¹²⁹Xe, i.e., from extinct ¹²⁹I decay. The ¹²⁹Xe/¹²⁶Xe spallation ratio varied from 0.7 in the high temperature fractions from Estherville to about 1.8 in the low temperature fractions from Patwar.