Granite fracture zone
With dark lava infilling.
It's not often that these types of geological features are so perfectly preserved.
It's possibly the heat from the lava (the larger source would be close by) and heat would be radiating out into the surrounding rock or more likely there was shearing at play and the friction generated enough head to cause the granite to partially melt and blend nicely with the dark larva to form a rock with a fractured appearence of uniform hardness.
These are technical issues that would take me into the field of geology, in this case the fracture is due to a separation of the layers, dark lava could be observed, for a time I did a research on faults or geological fractures of thermal waters in Venezuela , just in the exploitation of the sulfur mines and the findings were very interesting.
a very incredible work sir,is so amazing your post,@gavvet
Cool photos. Could perhaps be psudotachaylite?
The feeder dykes are close by. But here is some good pseudotachylite almost a 1000 km east of this desert at the vredefort dome.
Ok cool! I'll look it up! Cool photos and thanks for the feedback...
It must be exciting to discover places like this and that are in as good a state as you mention is something worth photographing thanks for sharing these great photos with us
nature always surprises us, good shot @gavvet
have a happy weekend
Definitely it looks like there was some flow going on there!