Things move slow on the MRB,,,,,,
You are I guess referring to the ground opening and gas escaping into atmosphere?
Yes,,, good information,,, we have a word for this venting (I just saw it in a pdf),,
but it escapes me at this moment....again
Remember the dust is several X's drier on Mars.And the gravity and the rust from iron oxide (I think),,,, then with this we add a percolation,,,(what you posted),,personaly
I think of a mild sulfuric acid/carbon dioxide/chlorine/sand/dirt/regolith????/ ,,,,,soil?
I really must read that mars soil.pdf again (I just posted it)
Our hearts go out to You Horton. You have brought us together steadily for many years.
Would be good to hear from you.Raymond Glassford.......