Copper chains: Study reveals Earth's deep-seated hold on copper | Science News | Scoop.it
From www.physorg.com - April 5, 2012 4:16 PM

Everything throughout history shows us that Earth does not want to give up its copper to the continental crust," said Rice geochemist Cin-Ty Lee, the lead author of the study. "Both the building blocks for continents and the continental crust itself, dating back as much as 3 billion years, are highly depleted in copper."