Re: Hunt for life on Mars dealt another blow
It would make sense to me that any substance in a state to flow, whether it be of the hyperclastic type as you suggest, much like the mud flows off of volcanoes, or a more stable flow such as liquid, would leave significant traces of the substance in the atmosphere.
CO2, H2O, whatever.
There's a lot of CO2, and some folks say the Martian atmosphere is saturated with water vapor, so that doesn't tell anything definitive, either.
Someone oughta go there.
Arf