This is from a book called "Mantle Plumes and their Record in Earth History" by Kent C. Condie, and you can read lots more on Google Book search in the preview pane. Think I'm going to dig out my credit card and buy it after this.

Here's an interesting excerpt ( one of many, truth be told)

"Anderson and colleagues suggest that almost all flood basalts are erupted near the edge of Archean cratons, which is a feature not readily explained by a plume source....many cratonic boundaries ...were not cratonic boundaries during flood basaltic eruption. It was not until Pangea broke up that these cratons became "marginal" cratons."

Page 111 discusses Norilsk as well, lots of good info there.

Here's the link

http://books.google.ca/books?id=eMIX...