Metamorphic thermal regime style

Terms that describe the ratio of temperature to pressure (T/P) during metamorphism, defining a classification scheme based on thermal gradient that is regarded as the most appropriate for building a temporal geodynamic context for metamorphic data. Some of these terms only partly correspond to metamorphic facies fields and classic-style terminology such as Barrovian and Buchan (i.e. correspondence is not one-for-one).