[Bernard Marx]

Pangaea broke up because it had been together quite long enough and it was all a big mistake to begin with, thank you very much.

Who got the ring? Very funny response but it doesn't help much with my question.

Kimberlites are diatremes, which are caused by violent, volatile-rich eruptions from the deep mantle

Can you point me in the direction of books/info on diatreme eruptions and their cause? (I'll Google as soon as I finish this message). They seem to be very ancient events, but possibly violent enough in themselves to have influenced earth's biology if any occurred within the time life has been evolving.

[Cincinatus]

Seriously, nobody knows why Pangea: 1) came together and 2) then split again. If you move mobile plates around on a sphere long enough, you'll ram them together and then split them up again eventually (because the process which drives the plates (mantle convection) is still operating.)

As for kimberlites, there is a large, professional literature. The best reference is:

Wylie P.J. (1967) Kimberlites, in Ultramafic and Related Rocks, J. Wiley and Sons, New York, pp. 240-278.

Good luck!