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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 ...
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]
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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 ...
Jakob Johannes Sederholm (20 July 1863 – 26 June 1934) [1] was a Finnish petrologist most associated with his studies of migmatites. [2]Troubled by illness throughout his life, Sederholm originally chose to study geology to allow him to work outdoors.
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 ...
Microscopic view of skarn under crossed polarizers Hand sample of skarn containing serpentinite from the edge of the Alta Stock, Little Cottonwood Canyon, Utah. Skarns or tactites are coarse-grained metamorphic rocks that form by replacement of carbonate-bearing rocks during regional or contact metamorphism and metasomatism.
A piece of tonalite on red granite gneiss from Tjörn, Sweden QAPF diagram with tonalite field highlighted. Tonalite is an igneous, plutonic rock, of felsic composition, with phaneritic (coarse-grained) texture.