Aluminum 26‐magnesium 26 dating of feldspar in meteorites

A search for ‘fossil’ Mg26 from the decay of 0.72 m.y. Al26 in an aluminum‐rich (plagioclase feldspar) phase of several stone meteorites has been carried out. An electron impact ion source in a tandem mass spectrometer was used for a series of measurements of the relative abundances of table magnesium isotopes in meteoritic and terrestrial feldspar, as well as in unseparated (‘common’) magnesium from meteorites, from meteoritic chondrules, and …