Layered intrusion
A large body of mafic or ultramafic magma cooled slowly at depth, in which crystals settled in successive layers. Some layers concentrate chromium and platinum-group elements, as in the Bushveld or Stillwater.
Composition
Rocks: peridotite, pyroxenite, norite, gabbro, anorthosite, chromitite.
Sources
In the atlas
- Bushveld, Merensky Reef South Africa
- Bushveld, UG2 chromitite South Africa
- Stillwater Complex (J-M Reef) United States