posted on Oct, 14 2003 @ 12:17 PM
Actually you dont need to have water to oxidize iron. As long as iron of the correct isotope is in contact with oxygen under the correct electrostatic
condition, oxidation will occur.
Granted, there is thought to be a decent amount of free water (in one form or another) on Mars, although still far less than what is found on earth
obviously.
The idea that there is more free oxygen on mars than once believed may have some validity to it, although I would not point to the existance of red
beds on the planet as evidence of current atmospheric conditions.
By the way, one of my personal favorite theories for Mars current condition includes the impact of a large asteroid: around 1 billion years ago, it is
estimated that a large asteroid impacted at a very oblique angle and on impact, the shock wave ripped a large amount of the atmosphere off and blew it
out into space. (Previous to this, Mars was thought to have an atmosphere 1/3 to 1/2 earth normal pressure, compared to 1/100 earth normal now). The
asteroid impact likely blew large chunks of the crust (or possibly skipped back up) into orbit to form the current two moons.
In this scenario, the composition of the original atmosphere is very much conjectural.