What about your Fe-S molasses?
I agree it wasn't your best idea. Just poke Mars with something sharp and it all comes flowing out, right?
Since you're an expert in dynamo-mantle phenomea, care to explain exactly how the currently active dynamo of the Earth works?
You don't exactly know?
Well, nobody else exactly knows either. Generalizations can be made from some experimental properties of materials under those conditions and constraints can be made by the intensity and topology of the magnetic field but exactly how, no one can say.