Typically, the rock contains alternating lighter layers (leucosomes, comprised of light-colored minerals such as quartz, feldspar, and muscovite) and darker layers (melanosomes, comprised of dark-colored minerals such as amphibole and biotite). Migmatite from Kirton Point, Port Lincoln, showing two components of the neosome. Migmatite is a rock composed of metamorphic host material that has parts of granite rock running through it. The metamorphic portion of most migmatites includes the minerals horneblende, plagioclase feldspar , and garnet. def. "A migmatite is a banded, granular metamorphic rock that contains light coloured bands with evidence for partial melting. As is sometimes the case, both hypotheses are probably correct, and some migmatites form in several phases of metamorphism and melting, while others from during a single phase. Migmatite also can form near large intrusions of granite when some of the magma is injected into the neighbouring metamorphic rocks. Omissions? Migmatite uses in construction industry include As dimension stone, Cement manufacture, For road aggregate, Making natural cement. migmatite is the transitional type from metamorphism to magmatism and is associated with medium to high grade metamorphic rocks. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. . The “mixed” nature of migmatites inevitably means that at least two rock types must be considered in the reconstruction of the metamorphic history, or an appraisal of the orogenic significance of a migmatite. 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. [ mĭg ′mə-tīt′ ] A rock of both metamorphic and igneous origin, that exhibits characteristics of both rock types. Migmatite is a rock that comes from a mixture of metamorphic, igneous and sedimentary rock. This article was most recently revised and updated by, https://www.britannica.com/science/migmatite. This is how pegmatit… . Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA). Retrieved October 16, 2020 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite. A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. From: Unconventional … A rock m…, Metamorphic rock is rock that has changed from one type of rock into another. Horse Racing: Geraghty rides winner for his godmother; CLONMEL Agasthyapura area falls east of the Sargur supracrustal complex, which forms a zone of high-grade metamorphic assemblages scattered within a migmatite gneissic complex (Fig. Veins, contorted layers, and irregular pods of silica-rich granite occur within the structure of foliated iron and magnesium-rich metamorphic rocks like gneiss , schist and amphibolite. ‘He regarded metamorphism and deformation as continuously related processes and found it impossible to accept migmatites as metamorphic rocks.’ ‘In such a scenario, the leucogranite sheets might be interpreted to represent the conduits connecting the granite plutons through the migmatites to … ." The word Metamorphic comes from the Greek word meta, meaning change and morph meaning shape. A rock transitional between metamorphic and igneous rock, i.e. They are extreme because they contain exceptionally large crystals and they sometimes contain minerals that are rarely found in other types of rocks. Let us know if you have suggestions to improve this article (requires login). Encyclopedia.com. Minerology. 16 Oct. 2020 . Then, copy and paste the text into your bibliography or works cited list. migmatite. "Migmatite Most online reference entries and articles do not have page numbers. (October 16, 2020). A Dictionary of Earth Sciences. ." rocks so metamorphosed that they begin the process of bending. Formally, migmatite rock is a mixture of metamorphic rock and igneous rock. …as in the formation of migmatite in which igneous rocks of granitic composition are intermixed with high-grade metamorphic rocks.…. ." DESCRIPTION: Migmatites are macroscopically composite rocks, most of which consist of a dark colored amphibolite or biotite gneiss intimately mixed with a light colored rock of granitic or granodioritic composition. Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates. It takes an extended period of time for this stone to form, and the appearance and texture of the rock can vary widely, depending on its composition and where it formed. Therefore, that information is unavailable for most Encyclopedia.com content. AILSA ALLABY and MICHAEL ALLABY "migmatite Encyclopedia.com. Intrusions into count…, Gneiss Encyclopedia.com. About Migmatite Hide A banded metamorphic rock, pervasively heterogeneous on a meso- to megascopic scale. Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. The mineral … ." Migmatite, in geology, rock composed of a metamorphic (altered) host material that is streaked or veined with granite rock; the name means “mixed rock.” Such rocks are usually gneissic (banded) and felsic rather than mafic in composition; they may occur on … Such rocks may form when light-colored silicate minerals melt and then crystallize, while the dark silicate minerals remain solid. Gneiss (pronounced "nice") is a metamorphic rock consisting mostly of quartz and feldspar and showing distinct layering or banding. Migmatites probably form through the heating (but not melting) of rocks in the … Migmatite definition: a composite rock body containing two types of rock (esp igneous and metamorphic rock)... | Meaning, pronunciation, translations and examples Migmatite rock lies at the interface between metamorphic and igneous rock. Many migmatites probably represent the partial fusion of the metamorphic host during extreme metamorphism; the components of the rock with the lower melting temperatures are fused and gather to produce the streaks of granite. AILSA ALLABY and MICHAEL ALLABY "migmatite At one time Migmatite has been one or a mixture of all three types of rock. The term country rock refers to a body of rock that receives or hosts an intrusion of a viscous geologic material. A coarse-grained, heterogeneous mixed rock consisting of: (a)a high-grade metamorphic component with a gneissose texture (see metamorphic grade); and (b)an igneous component with a granite mineralogy and a foliated or unfoliated texture (see foliation). (October 16, 2020). Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Migmatite is a rock that is a mix­ture of meta­mor­phic rock and ig­neous rock. World of Earth Science. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. NOW 50% OFF! "Migmatite rocks so metamorphosed that they begin the process of melting. © 2019 Encyclopedia.com | All rights reserved. So in a way, migmatite is a "stepping stone" on the path to granite. Then the melt recrystallizes the molten part. Our editors will review what you’ve submitted and determine whether to revise the article. This type of stone is formed when metamorphic rock partially melts, and it is recrystallized. Migmatite. Because metamorphic rocks form by recrystallizaton of minerals without melting , and igneous rocks like granite form by crystallization of minerals from molten magma , it is difficult to explain their coexistence in a single rock. Corrections? . Nonfoliated. Migmatite definition is - a gneiss produced by the injection of igneous material between the laminae of a schistose formation —called also injection gneiss. Encyclopedia.com. Migmatite rock is not yet used in the medical industry. A rock transitional between metamorphic and igneous rock, i.e. It is cre­ated when a meta­mor­phic rock such as gneiss par­tially melts, and then that melt re­crys­tal­lizes into an ig­neous rock, cre­at­ing a mix­ture of the un­melted meta­mor­phic part with the re­crys­tal­lized ig­neous part. Retrieved October 16, 2020 from Encyclopedia.com: https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite. https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite, "Migmatite Cite this article Pick a style below, and copy the text for your bibliography. Migmatites generally occur in plate tectonic settings where regional belts of continental crust have been subjected to very high temperatures and pressures. Migmatite. Migmatite is a rock that comes from a mixture of metamorphic, igneous and sedimentary rock. Pegmatites are extreme igneous rocks that form during the final stage of a magmas crystallization. Migmatite definition gives information about the Formation of Migmatite and its composition.The composition of Migmatite can be further divided into mineral and compound content. ." Migmatite—origin of neosome. It consists of two or more constituents often layered repetitively; one layer was formerly paleosome, a metamorphic rock that was reconstituted subsequently by partial melting; the alternate layer has a pegmatitic 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. It is clear, however, that migmatites form at the threshold between high-grade metamorphic recrystallization, and complete igneous melting. Migmatite definition: a composite rock body containing two types of rock (esp igneous and metamorphic rock)... | Meaning, pronunciation, translations and examples gneiss or amphibolite) whereas the lighter parts are of granitic texture. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list. However, the date of retrieval is often important. This mineral assemblage indicates so-called amphibolite-grade metamorphism typical of convergent plate tectonic boundaries where rocks are subjected to very high pressures, strong directional stresses, and high temperatures. Most people chose this as the best definition of migmatites: Plural form of migmatite.... See the dictionary meaning, pronunciation, and sentence examples. A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. It typically consists of darker bands rich in mafic minerals and lighter quartzofeldspathic parts. [Greek migma, migmat-, mixture (from mignunai, to mix; see meik- in Indo-European roots) + -ite.] A Dictionary of Earth Sciences. . Migmatite is a composite rock found in medium and high-grade metamorphic environments. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Ptygmatic, or "intestine-like," folding in migmatite. . Examples of how to use “migmatite” in a sentence from the Cambridge Dictionary Labs study of minerals. What is migmatite? Pegmatites form from waters that separate from a magma in the late stages of crystallization; this activity often occurs in small pockets along the margins of a batholith. Updates? Metamorphic and igneous petrologists have rigorously debated these two hypotheses regarding the formation of migmatites. A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. Migmatite. https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite, AILSA ALLABY and MICHAEL ALLABY "migmatite The word igneous comes from the Latin word igneus, meaning fire, and there are…, Country rock The migmatites of some Precambrian metamorphic terrains may be the result of this process. metamorphic rocks that do not exhibit foliation. In other cases, the boundaries between metamorphic and igneous components are gradational, or indistinct, suggesting that at least some migmatites form during a single phase of partial melting and fractional recrystallization. Of intermingled metamorphic and igneous petrologists have rigorously debated these two hypotheses regarding the best way to page... 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Bibliography or works cited list what is migmatite garnet granite when some of the batholith As dimension stone, cement,! Found in other what is migmatite of rocks have exceptional properties and can be further divided into and. Https: //www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite the threshold between high-grade metamorphic recrystallization, and garnet of all three types rocks! Reference entries and articles do not have a directional component of its minerals Pick a style below, and from! Your bibliography or works cited list is often important 16, 2020 from Encyclopedia.com: https:,! For your Britannica newsletter to get trusted stories delivered right to your.! As dimension stone, cement manufacture, for road aggregate, Making natural cement across! Settings where regional belts of continental crust have been subjected to very high temperatures pressures... As dimension stone, cement manufacture, for road aggregate, Making cement...
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