Formation of blueschist determined by changes to the chemical composition of oceanic crust One of the big mysteries in the history of the Earth is the emergence of plate tectonics. When exactly did ...

The material from which blueschist is made, includes basalt and other rocks, reached depths of nine to eighteen miles, where the temperature was between 400- and 900-degrees. Blue Rock sits on a ...

It's blue, and a bit green: two of my favorite colors. It's got garnets! Love the garnets, plus they're my birthstone. Many pieces have got pyrite, which has always been a particular favorite of mine.

Clear evidence for subduction-induced metamorphism, and thus the operation of plate tectonics on the ancient Earth has been lacking. Theoretical calculations indicate that we may have been looking for ...

© All photographs on this webpage may be downloaded and used for teaching purposes only. The photographs may not be reproduced in any publications - commercial or ...

This news release is available in German. One of the big mysteries in the history of the Earth is the emergence of plate tectonics. When exactly did the processes of plate tectonics begin that today ...