Let's consider some of the implications of what is going on here:

1) energetic geysering/jetting action involving dark sand/dust and vaporized volatiles (primarily CO2, but possibly including other volatiles) occurs in some places at both poles during local spring.

2) this very dramatic effect "turns over" the upper surface of the dark circumpolar materials, mixing the sand and dust with any remaining solid volatiles (like H2O).

3) this action may also be "creating" sand and dust, thus helping to form the dunes that are found at both poles.

This dark material may be constantly saturated with volatile material -- perhaps including water ice -- and it may host liquid water beneath the surface.

Could this matrix host biology?