Table T8. Summary of alteration minerals and conditions of formation.
| Metamorphic minerals | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 800°-400°C | 400°-150°C | 150°-0°C | ||||||||||||||||||||||
| Diopside | Secondary plagioclase | Brown amphibole | Dark green amphibole | Talc | Magnetite | Green amphibole | Chlorite | Oxides | Quartz | Albite | Titanite | Epidote | Prehnite | Sulfide | Zeolite | Green smectite | Sulfide | Orange smectite | Carbonate | Hematite | Oxyhydroxides | |||
| Olivine | o | O | O | O | o | o | o | o | O | O | o | o | o | o | ||||||||||
| Clinopyroxene | O | O | O | o | o | O | O | o | o | o | o | o | o | o | ||||||||||
| Orthopyroxene | o | O | o | o | O | o | o | o | o | o | o | o | ||||||||||||
| Plagioclase | O | o | o | o | o | o | o | o | O | |||||||||||||||
| Hornblende | O | o | O | ? | o | O | o | ? | ||||||||||||||||
| Oxides | ? | ? | o | |||||||||||||||||||||
Notes: Symbols = presence of secondary mineral phases. O = secondary minerals that commonly replace a primary phase; o = less common replacement. ? = secondary minerals after primary phases that were difficult to identify in hand specimen.