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Bright basal reflectors in radargram from the Mars Advanced Radar forSubsurface and Ionosphere Sounding (MARSIS) of the Martian south polar layereddeposits (SPLD) have been interpreted to be evidence of subglacial lakes.However, this interpretation is difficult to reconcile with the low Martiangeothermal heat flow and the frigid surface temperature at the south pole. Weconduct a comprehensive thermophysical evolution modeling of the SPLD and showthat subglacial lakes may only form under exceptional circumstances. Subglaciallakes may form if the SPLD contains more than 60 % dust volumetrically orextremely porous ice (>30 %), which is unlikely. A thick (>100 m) layer ofdirty ice (>90% dust) at the base of the SPLD may also enable basal melting,resembling a sludge instead of a lake. Other scenarios enabling subglaciallakes in the SPLD are equally unlikely, such as recent magmatic intrusions atshallow depths.

Thermophysical assessment on the feasibility of basal melting in the south polar region of Mars