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Ptygmatic folding in migmatite on Naissaar Island, EstoniaMigmatite on the coast of Saaremaa, EstoniaIntricately-folded migmatite from near Geirangerfjord, Norway
Migmatite is a composite rock found in medium and high-grade metamorphic environments, commonly within Precambrian cratonic blocks. It consists of two or more constituents often layered repetitively: one layer is an older metamorphic rock that was reconstituted subsequently by partial melting ("neosome"), while the alternate layer has a pegmatitic, aplitic, granitic or generally plutonic appearance ("paleosome"). Commonly, migmatites occur below deformed metamorphic rocks that represent the base of eroded mountain chains.[1]
Migmatites form under extreme temperature and pressure conditions during prograde metamorphism, when partial melting occurs in metamorphic paleosome.[2] Components exsolved by partial melting are called neosome (meaning ‘new body’), which may or may not be heterogeneous at the microscopic to macroscopic scale. Migmatites often appear as tightly, incoherently folded veins (ptygmatic folds).[3] These form segregations of leucosome, light-colored granitic components exsolved within melanosome, a dark colored amphibole- and biotite-rich setting. If present, a mesosome, intermediate in color between a leucosome and melanosome, forms a more or less unmodified remnant of the metamorphic parent rock paleosome. The light-colored components often give the appearance of having been molten and mobilized.
^Sawyer, Edward (2008). Atlas of Migmatites. The Canadian Mineralogist Special Publication 9. Mineralogical Association of Canada.
^Mehnert, Karl Richard (1971). Migmatites and the origin of granitic rocks, Developments in Petrology. Elsevier.
^Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks, Part 6. Migmatites and related rocks, p2. [1]
Migmatite is a composite rock found in medium and high-grade metamorphic environments, commonly within Precambrian cratonic blocks. It consists of two...
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