Nanosims measurements of solar wind Mg, Fe, and Cr fluences

The chemical composition of the Sun provides the reference standard for a wide variety of astronomical, cosmochemical, and geochemical studies. To better determine the solar composition, the Genesis spacecraft collected solar wind at the L1 point in the space for 27 months prior to returning samples to Earth in September 2004. Prior ion probe analyses of Genesis samples have found discrepant results for the Mg and Fe solar wind fluences from different collector materials [1]. We report measurements of Mg, Fe, and Cr depth profiles in Genesis diamond-like C sample 60062 using the Carnegie Institution Cameca NanoSIMS 50L ion microprobe. Our results for Mg and Fe are similar to previous analyses of the same sample using different instruments.