Refractory phases in primitive meteorites devoid of ~26Al and ~41Ca: Representative samples of first solar system solids?

摘要

A large number of Ca-Al-rich refractory inclusions in primitive meteorites incorporated the short-lived nuclide ~26Al at the time of their formation with an initial ~26Al/~27Al ratio of 5 X 10~-5. However, there exist inclusions and refractory phases like corundum and hibonite in these meteorites that have no evidence of ~26Al. A suite of refractory inclusions from these meteorites also have well-defined initial ~26Al/~27Al ratios that are lower by factors of 5-1000 compared to the canonical value of 5 X 10~-5. Refractory phases free of ~26Al are also devoid of the Short-lived nuclide, ~41Ca.