Very interesting....might have a crack at summising how it formed
After breakkie though:
I'll have a good look at the pics....maybe a few days, yet before I can come back to this. Have to finish off my assignment. However, I can say this...the fault graben cutting across the rim of the depression....they're definitely later than the crustal extension that created the depression. They cut right across it....see the large one about halfway along the depression, if you look closely you can see a faint extension of the graben that's pretty much covered by the infill (which is mostly a basaltic plain and sediments). You can tell by the slight differences in colour and the impression of the underlying geology showing itself at the surface...it can't be buried too deeply. It's a very complex geology...it won't be solved overnight, that I can assure you. This is precisely why we need to send people there, to ground truth what we find from the probes and to drill this thing to bits...get a handle on it by core logging the rock formations (at depth) from the drill cores, map the place at high scale, sample the rocks and thin section them....the works. Just staring down at them from 800km up isn't going to figure things out.
it is great to read your interpretations 
