Elemental and isotopic heterogeneities of rare gases in the solar system.

Elemental and isotopic heterogeneities of rare gases in the solar system: Reply to a comment by Kuroda and Sheng

“…Kuroda and Sheng (1987) contradict and vitiate our conclusions of ele mental heterogeneities in the rare gases of Allende?…”

“…The 4He/ 132Xe ratio is much higher in solar -wind-im planted gases than in planetary gases, thus shifting the value of this ratio to the right in Figure 1 of Kuroda and Sheng (1987). The solar-wind-implanted gases are probably in phases that are dissolved in preparing the acid residues.…”

“…Although they attempted to explain the primordial rare gases that were initially the excess 134,136Xe as fission products of super trapped in meteorites (Sabu and Manuel, 1980;heavy element 115, 114 or 113 (Lewis et al, Manuel, 1980Anders et al, 1975), more importantly, This observation has been addressed in some by isolating material enriched in the carrier of the models proposed to explain the occur phase of the anomalous xenon, they provided rence of isotopically anomalous elements in the first experimental evidence that (Sabu and meteorites (e.g., Clayton, 1981), but it has been Manuel, 1980): ignored in others (e.g., Anders, 1981;Kuroda i) normal, planetary-type He and Ne (20Ne/ and Sheng, 1986;Saebo and Kuroda, 1986a, b Kuroda and Sheng (1987) limit their discus sion to the data of Lewis et al (1975). In order for this replay to be clear to the readers, this reply will address specific questions raised by them, using the data of Lewis et al (1975) to document our conclusions.…”

“…Also shown there are values of the 136Xe/132Xe ratio at the intercept where the elemental ratios are zero. If all of the data from Table 1 were plotted as Kuroda and Sheng (1987) have done in the bottom section of their Figure 1, then there would be six correlation lines converging on a single intercept at 136Xe/132Xe = 0.32 0.01, 'He/ 132Xe = 0, 4He/84Kr = 0, 4He/36Ar = 0 , 2oNe/132Xe = 0, 2oNe/84Kr = 0 and 2oNe/36Ar = 0 . These correlations are shown graphically as Figure 5 in the paper by Ballad et al (1979).…”

“…Values of the 136Xe/132Xe isotopic ratio compared with the elemental ratios of He and Ne rela tive to Xe, Kr and Ar in acid residues of Allende (Lewis et al ., 1975 Why does Figure 1 of Kuroda and Sheng (1987) show a scatter from the correlation lines for rare gases in bulk Allende and in the temperature fractions of the Allende 3CS2 residue? The data point for the 129Xe/132Xe, 4He/ 132Xe ratios in bulk Allende lies above the corre lation line because there is radiogenic 129Xe in this meteorite from the decay of extinct 1211 (Podosek and Lewis, 1972).…”