Most hirtelen ezt találtam. Földi viszonylatban így képzõdhet perklórsav (, hogy a Marson miképpen, azt nem tudom...): (66. oldal)
"A current theory regarding the origin of naturally occurring perchlorate in the environment centers on natural atmospheric processes. While the exact mechanism for the creation of perchlorate is unknown, the theory suggests that chloride, possibly in the form of sodium chloride from the sea or land-based chloride compounds blown in from the atmosphere, reacts with atmospheric ozone. In the atmosphere, photochemical reactions between chloride and ozone create perchlorate. This process probably occurs over much of the earth and is analogous to nitrate formation in the atmosphere (Walvoord et al., 2003). In addition, there is the possibility that lightning may play a role in the creation of some atmospherically produced perchlorate (Dasgupta et al., 2005;W.A. Jackson et al., 2003), but this theory has not been confirmed. The rate of perchlorate creation in the atmosphere has not been determined, although it is thought to be a relatively slow process.
Following atmospheric creation, perchlorate returns to the earth’s surface dissolved in precipitation. In arid environments, where the rate of deposition exceeds the rate of dissolution by ongoing precipitation, perchlorate can be incorporated into certain geologic formations (Orris, 2004). The widespread presence of microorganisms capable of reducing perchlorate further supports the concept of naturally occurring perchlorate (Coates et al., 1999)..."