migmatite

mig·ma·tite

M5315600 (mĭg′mə-tīt′)n. 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.]

migmatite

(ˈmɪɡməˌtaɪt) n (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]

Migmatite

enUK

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.

单词	migmatite
释义	migmatite enUK mig·ma·tite M5315600 (mĭg′mə-tīt′)n. 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.] migmatite (ˈmɪɡməˌtaɪt) n (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] Migmatite enUK 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.
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