Continuous Reactions
Compositional Changes in the Biotite Zone Increasing Grade Compositions of muscovite, chlorite and biotite, but particularly, muscovite and chlorite change continuously with increasing metamorphic grade
Continuous Reaction Discontinuous Reaction H2O + Chloritoid + Biotite = Chlorite B A C Discontinuous Reaction H2O + Chloritoid + Biotite = Chlorite + Garnet
Continuous Changes Across the Staurolite-Biotite-in Reaction Chlorite + Staurolite = Garnet + H2O Chlorite = Garnet + Biotite + H2O Chlorite = Staurolite+ Biotite + H2O Staurolite+ Biotite = Garnet + H2O
The T-XMg Relationships Staurolite-Biotite-in Reaction Mg-enrichment typically in the order: cordierite > chlorite > biotite > chloritoid > staurolite > garnet
Calibration of the Staurolite-biotite-in Reaction
Staurolite-out Reaction
The Amphibolite Facies in Continuous Reaction Space
P-XMg Sections F M
T-XMg and P-XMg Sections