28 research outputs found
40Ar/39Ar and cosmic ray exposure ages of plagioclase-rich lithic fragments from Apollo 17 regolith, 78461
Terrestrial-Type Xenon in Meteoritic Troilite
Recently it has been realized that the isotopic composition of Xe in different phases of chondrites is not uniform and that AVCC Xe is a mixture of the different nucleogenetic components trapped in these phases1-4. We show here a similar abundance pattern for the nonradiogenic xenon isotopes in air and in meteoritic troilite (FeS), which suggests that the isotopic composition of atmospheric Xe was not produced by unique events in the history of terrestrial material but represents a particular mix of the different nucleogenetic components of Xe that was dominant in a central Fe- and S-rich region of the protoplanetary nebula5