Demystifying migmatites: introduction for field-based geologist

摘要: Migmatites are heterogeneous, medium- to high-grade metamorphic rocks with at least one component formed by partial melting. As migmatites form under P–T conditions common in the middle and lower crust, they widespread likely be encountered field. They complex that can confusing, present paper provides a background for field-based geologist. comprise several main components. Neosome is newly melting includes leucosome residuum (or melanosome). These essentially represent liquid solid components of melt reaction. Palaeosome part migmatite did not undergo typically more refractory composition. divided into two types. Metatexites have fraction preserve coherent pre-partial textures palaeosome. Diatexites dominated neosome, structures absent. further subdivid...