stage | temperature range | depth zone |
igneous | >1000˚C | > 30 km |
pegmatite | 600˚C - 1000˚C | 18 - 30 km |
pneumatolite | 400˚C - 600˚C | 12 - 18 km |
hydrothermal | 100˚C - 400˚C | 3 - 12 km |