Noble Gases in Silicate Inclusions of Kodaikanal
Analyses of the noble gases from silicate inclusion of Kodaikanal show extensive loss of the lighter cosmogenic gases. A comparison of the cosmogenic gases in the silicates with reported concentrations of cosmogenic noble gases in the metal phase indicates an exposure age between 7.5 and 40 million years if a chondritic composition is assumed for the silicates. An upper limit of 6 × 10-13 cm3 STP radiogenic 129Xe per gram is almost three orders of magnitude less than the radiogenic 129Xe in Toluca silicates. This agrees with the different K-Ar and Rb-Sr ages reported for the inclusions in these two meteorites.
E. C. Alexander and O. Manuel, "Noble Gases in Silicate Inclusions of Kodaikanal," Earth and Planetary Science Letters, vol. 4, pp. 363-367, Elsevier, Jul 1968.
The definitive version is available at https://doi.org/10.1016/0012-821X(68)90064-2
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