I didn’t it expect it so much to be the specific gold sent back to Greece by Alexander as being “descended” from that gold. Alexander’s gold (Persia’s gold) would have been floating around the Greek world and significantly increased the supply. I just don’t know if there has been an analysis to determine the percentage of gold in various treasuries that came from that original source. It would be a good way to map trade routes.
I'm sure there's been such an analysis. It would make a great book for the common reader if written by someone like Simon Winchester. "The History of Gold."