In the process, they discovered a thickened section of the mantle transition zone, located about 410 to 660 kilometers below the Earth’s surface. This zone separates the upper and lower mantles ...

To investigate this, a team of researchers in Japan performed well-controlled deformation experiments on phase D aggregates ...

Deeply hidden in Earth's mantle there are two huge "islands" the size of a continent. New research from Utrecht University ...

Moreover, they suggest that the environment in which they formed – a divide between the upper and lower mantle called the 660-kilometer discontinuity (or, more simply, the transition zone) – is rich ...