Changes in a rock’s mineral assemblage, texture or composition under altered pressure, temperature or fluid conditions, conventionally dominated by solid-state processes.
A grouping of mineral assemblages characteristic of a range of temperature and pressure, allowing for the original rock composition.
A high-temperature metamorphic facies, commonly with relatively water-poor assemblages; it does not determine a unique bulk composition.
A range of pressure-temperature conditions characterized by diagnostic hydrous high-pressure mineral assemblages in suitable compositions.
Transformation of suitable rock to an eclogite assemblage. Increased density can affect slab buoyancy, but reaction kinetics can delay transformation.
A thin metamorphic unit structurally beneath an emplaced ophiolite, potentially recording heating and deformation during early convergence or emplacement.
Metamorphism at elevated pressure relative to ordinary shallow-crustal environments; its tectonic meaning depends on the full pressure-temperature-time path.
Metamorphism reaching conditions sufficient for diagnostic high-pressure phases such as coesite in an appropriate composition. Their growth must be distinguished from detrital inheritance or unrelated inclusions.
The inferred history of pressure and temperature experienced by a rock. Dating specific growth domains and linking them to mineral reactions are needed to attach time to the path.
A reaction that consumes carbonate-bearing assemblages and releases carbon dioxide or another carbon-bearing fluid component.
Chemical modification of rock by externally supplied fluid or melt.
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