migmatization

migmatization

[‚mig·mə·də′zā·shən]
(petrology)
Formation of migmatite; involves either injection or in-place melting.
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The degree of migmatization increases toward the centre of the gneiss, away from the exposed contacts with the surrounding plutonic rocks.
Disequilibrium melting and the rate of melt residuum separation during migmatization of mafic rocks from the Grenville Front, Quebeq.
Migmatization is generally common and strong in places.
Migmatization is widespread, resulting in the formation of plagioclase and potassium-feldspar porphyroblasts and occasionally charnockitic leucosomes, also of small granitoid veins and bodies.
Migmatization has resulted in potassium-feldspar- and plagioclase-rich leucosomes and granitic veins and bodies and charnockitic veins in granulitic areas.
Both charnockitic and granitic migmatization is observed.
Two rock samples, 181909 and 181925 were taken in the lower Proterozoic metamorphic granito-geneiss associated with migmatization.
Local negative magnetic and gravity anomalies of low intensity reflect localities of intense late orogenic granite migmatization and/or intrusion.