This world is well thought and has a solid bacgkground to be among the most scientifically plausible seen so far from what I have seen...
I had the desire to create a new alien world in future going back to the roots of how I made Thersis but this time I wanted ot make and study the climate of a possible panworld with large terrain masses and the beginning of a fracturing ...
I also like a lot the fact that you considered older and newer orogeny , this justifies much better the placement and the typology of the mountain chains , so you can see the difference between appalachian mountains, the Urals, the Alps the Himaplaya etc...
Great job so far.