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  2. Migmatite - Wikipedia

    en.wikipedia.org/wiki/Migmatite

    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 ("paleosome"), while the alternate layer has a ...

  3. Massif du Mercantour-Argentera - Wikipedia

    en.wikipedia.org/wiki/Massif_du_Mercantour-Argentera

    the Gesso-Stura-Vésubie complex (composed of migmatite, anatexites and amphibolites); the Permian granites, in the center of massif; the mylonite of Valletta-Mollières, crossing the massif from one side to the other, along the northwest – southeast axis, composed mainly of mica schists.

  4. Migmatites - Wikipedia

    en.wikipedia.org/?title=Migmatites&redirect=no

    Pages for logged out editors learn more. Contributions; Talk; Migmatites

  5. Gneiss - Wikipedia

    en.wikipedia.org/wiki/Gneiss

    Migmatite is a gneiss consisting of two or more distinct rock types, one of which has the appearance of an ordinary gneiss (the mesosome), and another of which has the appearance of an intrusive rock such pegmatite, aplite, or granite (the leucosome). The rock may also contain a melanosome of mafic rock complementary to the leucosome. [11]

  6. Geology of Nigeria - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Nigeria

    The Migmatite-Gneiss Complex covers half of Nigeria's surface area and encompasses Archean gray gneisses, with tonalite and granodiorite consistencies. Within this complex are occurrences of schist , migmatite , garnet , sillimanite , kyanite and staurolite , which together indicate high-grade metamorphism up to the level of amphibolite on the ...

  7. Natashquan River - Wikipedia

    en.wikipedia.org/wiki/Natashquan_River

    The Natashquan River is entirely within the Grenville geologic province of the Canadian Shield, characterized by a hilly plateau, ranging in altitude from 140 meters (460 ft) to 620 meters (2,030 ft), and consisting of felsic and metamorphic rock (such as gneiss, migmatite and granite), clastic rock (quartzite) and schists in the lower portion, with a few intrusions of mafic rock (diorite and ...

  8. Tonalite–trondhjemite–granodiorite - Wikipedia

    en.wikipedia.org/wiki/Tonalite–trondhjemite...

    The quartz percentage among felsic minerals in TTG rocks is usually larger than 20% but less than 60%. [1] In tonalite and trondhjemite, more than 90% of the feldspars are plagioclase, while in granodiorite, this number is between 65% and 90%. [1]

  9. Granite - Wikipedia

    en.wikipedia.org/wiki/Granite

    Migmatite featuring felsic minerals, at Morton Gneiss Complex Granitization is an old, and largely discounted, hypothesis that granite is formed in place through extreme metasomatism . The idea behind granitization was that fluids would supposedly bring in elements such as potassium, and remove others, such as calcium, to transform a ...