What Is This Blue Area on Mars?

[gordi]

I came across this and thought it was worth posting.   What do you suppose this is? 
Could it be a crystal clear blue lake?  Someone painted their outpost blue?  The "red planet" has blue clouds?     Hmm...    

ohhhh, now that's one I haven't seen yet! Cool.
Thanks Mystic,
The answer is..... I have no idea!! LOL

As Nin mentioned above, these images are heavily processed and artificially coloured, but I don't have an answer as to why that area would be coloured blue.

The dark area definitely isn't "just" shadow, as it crosses over the rim of the crater and extends out over the area that would be brightly lit by the sun (reference the areas immediately above the other craters in that area.)
It almost looks like a pattern of deposits of darker minerals thrown up from the "blue" part? (Like when a volcano on Earth erupts)

Very strange.

I shall try and do some "digging" LOL

Thanks again!
G