Abstract
The CFM projection (C = CaO+Na2O+K2O−Al2O3, F = Fe0−Fe2O3, M = MgO) was originally designed for illustrating mineral assemblages in upper amphibolite and granulite facies quartz–feldspar–magnetite-bearing metabasites. By introducing chlorite, the projection can also be used to illustrate mineral assemblages in greenschist facies quartz–feldspar–magnetite-bearing metabasites. The greenschist–amphibolite facies transition takes place in the context of Abbott’s (1982) lowest grade CFM topology.
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