Karen Hanghoj, a scientist with Denmark's Geological Survey, points to the southern tip of Greenland on a colorful map hanging in her office.
"What you can see here in the southern region here is you have a big pink region," she says. "And then within the pink region, you see you have all these little purple dots.
"And what the purple dots are is a later period of rifting. These complexes have these weird chemistries and have these very, very strange minerals in them," she adds.