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A rock of both metamorphic and igneous origin that exhibits characteristics of both rock types and probably forms through the heating but not melting of rocks in the presence of abundant fluids.

[Greek migma, migmat-, mixture (from mignunai, to mix; see meik- in Indo-European roots) + -ite.]


(Geological Science) a composite rock body containing two types of rock (esp igneous and metamorphic rock) that have interacted with each other but are nevertheless still distinguishable
[C20: alteration of Swedish migmatit, from Greek migma mixture + -ite1]
References in periodicals archive ?
The rocks that comprise the Santander Massif are amphibolite grade gneisses, migmatites, and meta-sediments of the Precambrian Bucaramanga Formation.
In the Saghand region, the Chaydouni--Posht Badam complex rocks (Amphibolites, Gneisses, Schists, Migmatites, Anatectites) are indicative of a tectonic melange of Precambrian metamorphic rocks that have been transformed into Serpentinite together with Pyroxenite and pyroxene--olivine-bearing rocks [3].
Sandstones Aptian Granites, Gneisses, Schists, Migmatites AGE DEPOSITIONAL BASIN ENVIRONMENT Quaternary Continental Niger Delta Tertiary Basin Pliocene Miocene Oligocene Continental Eocene Estuarine, Shallow marine Paleocene Shallow Marine, deltaic Upper Maastrichtian Fluvio-deltaic Anambra Cretaceous Basin Fluvio-deltaic Shallow Marine, deltaic Shallow Marine, deltaic Campanian Santonian Shallow Marine, deltaic Benue Trough Conician Middle Turonian Shallow Marine Cret.
The Bedonia Project is underlain by rocks of the Proterozoic Mount Andrews Migmatites and contains a number of magnetic features (ten current targets) that may be related to intrusive mafic rocks (the host rocks for the Nova nickelcopper discovery).
the GAC publication The Dynamics of Epeiric Seas, and the Atlas of Migmatites published by MAC), textbooks (e.
2004), these soils were developed both from Devonian sedimentary rocks (Ponta Grossa Formation) and from Precambrian rocks such as subalcaline granites, syenites, and migmatites.
This atlas of migmatites, heterogeneous rocks often found in continental crusts, is designed for geologists and mineralogists who need a reference for identifying and classifying these substances in the field.
The Vijayan Complex rocks consists of mainly granitic gneisses, hornblende biotlite gneisses, and migmatites formed under amphibolites facies, and are mainly confined to the eastern sector.
The latter often contains migmatites or small bodies of enderbitic composition, otherwise plagioclase-potassium-feldspar leucosomes and granites prevail.
Examples are migmatites (rocks that were once partially molten and have retained part of their melt) and dykes (magma conduits that now contain solidified magma).