Eclogite

If greenstone is buried to 18,000 atmospheres and heated to 700°C (1,290°F), its minerals convert to other ones, including garnet and clinopyroxene. The result is a new metamorphic rock: eclogite. The minerals in this metamorphic rock record the following temperature (T) and pressure (P) conditions within the Earth: T = 700°C, P = 18,000 atm.

Eclogite

The eclogite was originally a basalt erupted at Earth's surface. It was subducted into the mantle, changed to eclogite, caught up in a kimberlite magma, and blasted back to the surface.

Eclogite

The eclogite was originally a basalt erupted at Earth's surface. It was subducted into the mantle, changed to eclogite, caught up in a kimberlite magma, and blasted back to the surface.

Eclogite

Changed by subduction, this rock was once sea-floor basalt. It was metamorphosed at high pressures and high temperatures, transforming into an eclogite.