Migmatite


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migmatite

[′mig·mə‚tīt]
(petrology)
A mixed rock exhibiting crystalline textures in which a truly metamorphic component is streaked and mixed with obviously once-molten material of a more or less granitic character.

Migmatite

 

a rock consisting of metamorphic enclosing material with veins of granite. It is formed when liquid strata of granitic magma penetrate along the cleavage of metamorphic rocks. The granitic magma may form through the partial melting (anatexis) of metamorphic rocks under conditions of deep burial (regional metamorphism), when the molten rock is forced out of the unmelted metamorphic remainder. Many Precambrian migmatites were formed under such conditions. Migmatites located near large intrusive bodies of granitoids arose when granitic melt was injected into adjacent metamorphic rocks (injection gneiss). Migmatite is commonly found in ancient granite-gneiss complexes.

References in periodicals archive ?
Keywords: migmatite, sample filiation, acoustic emission, ultrasonic sounding, uniaxial loading,
The remaining plutons of the study region are emplaced in migmatite domains and do not show aureoles.
However, 7 out of the total 88 groundwater samples within migmatite bedrock have their EC > 1000 [micro]S/cm.
00'E) near the town of Turku in southwestern Finland belong to the Turku Migmatite Complex of the southern Svecofennian Shist Belt.
THE HURL: This strapping Supreme Leader gelding, trained by Mouse Morris, proved a real eye-catcher in the four-year-old conditions event won by Migmatite at Naas.
Geochemically, synorogenic granites show I-type characteristics and their genesis is related to granulitic metamorphism (Niin 1997), although some authors have treated them together with late-orogenic migmatite granites (Puura et al.
The Saint Barthelemy massif is composed of three major units, in places separated by unconformities: a basal gneiss unit, a migmatite unit overlain by a mica schist envelope, and finally a weakly metamorphosed Paleozoic succession.
The scale-invariant nature of migmatite from the Oberpfaltz, NE Bavaria and ist significance for melt transport // Tectonophysics.
High-temperature metamorphism accompanied by partial melting and migmatite formation is a common feature in collisional belts (Bohlen 1987, Harley 1989, Kohn et al.
Country rocks include charnockite mafic and felsic granulite, garnetiferous granulite, biotite gneiss, migmatite, mylonite and pegmatite.
These include granitic gneiss, paragneiss, migmatite, amphibolite, quartzite, arkose, marble, and calc-silicate zones in marble.