Geocheminar fall-2015

Complex secondary, fluid-related alterations in basaltic meteorites: The case of Camel Donga’s metals

The diverse secondary, fluid-related alterations in basaltic (eucrite) meteorites continue to surprise. In the case of Camel Donga, our new evidence requires major revision to the 27-year-old hypothesis (Palme et al., 1988) that the meteorite's 2 wt% of Fe-metal formed by in-situ reduction, in a system that simply lost SO2 gas and otherwise remained closed. Scattered metal nodules clearly formed by physical admixture, and the system was open to fluid ingress as well as egress, with H2S and CO probably more important than SO2.