Lloyd said:

I just read that the rim of Wolfe Creek Crater in Australia, I think, and the rim of Mare Imbrium on the Moon both have high thorium content. I assume the thorium was transmuted from a more common element during thermonuclear explosion during impacts. Have you thought about such transmutation byproducts from such explosions?

Not specifically, though I have wondered how there could be uranium deposits at the Earth's surface, when such heavy elements "should have" settled to the core when the Earth was molten, suggesting that they were formed by the impact of the continental granites.

 

BTW, there is (or should be) more material on this topic is at:

 

'17-07-07, 04:27