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 a regional scale in areas of high-grade metamorphism. A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. 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. AILSA ALLABY and MICHAEL ALLABY "migmatite rocks so metamorphosed that they begin the process of melting. ." Some migmatites appear to have formed by intrusion of liquid granitic melt into a preexisting banded metamorphic rock . migmatite is the transitional type from metamorphism to magmatism and is associated with medium to high grade metamorphic rocks. Omissions? Britannica Kids Holiday Bundle! 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. Encyclopedia.com. Examples of how to use “migmatite” in a sentence from the Cambridge Dictionary Labs Intrusions into count…, Gneiss migmatite. 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. A rock m…, Metamorphic rock is rock that has changed from one type of rock into another. Metamorphism is the process by which the structure and mineral content of rocks transform in response to changes in temperature , pressure , fluid co…, Rocks . Migmatite definition: a composite rock body containing two types of rock (esp igneous and metamorphic rock)... | Meaning, pronunciation, translations and examples Therefore, that information is unavailable for most Encyclopedia.com content. Migmatite definition is - a gneiss produced by the injection of igneous material between the laminae of a schistose formation —called also injection gneiss. A Dictionary of Earth Sciences. A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. ." However, the date of retrieval is often important. metamorphic rocks that do not exhibit foliation. © 2019 Encyclopedia.com | All rights reserved. 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 … A Dictionary of Earth Sciences. From: Unconventional … https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite, "Migmatite Migmatite. Then the melt recrystallizes the molten part. The migmatites of some Precambrian metamorphic terrains may be the result of this process. Most online reference entries and articles do not have page numbers. ." Such rocks may form when light-colored silicate minerals melt and then crystallize, while the dark silicate minerals remain solid. Let us know if you have suggestions to improve this article (requires login). In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Corrections? This article was most recently revised and updated by, https://www.britannica.com/science/migmatite. "A migmatite is a banded, granular metamorphic rock that contains light coloured bands with evidence for partial melting. 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 rock exhibiting both igneous and metamorphic characteristics. migmatite. Sandstone is a type of sedimentary rock that forms from a compacted sand aggregate glued together with a mineral cement. World of Earth Science. What I mean by this is that migmatites are metamorphic rocks formed via melting of rock -- but melted rock is magma -- and igneous rock comes from magma. In these examples, the granite inclusions have sharp contacts with the metamorphic bands, and cut across the metamorphic fabric in places. Migmatites probably form through the heating (but not melting) of rocks in the … Most people chose this as the best definition of migmatites: Plural form of migmatite.... See the dictionary meaning, pronunciation, and sentence examples. This is how pegmatit… Nonfoliated. 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. Migmatite. Migmatite rock lies at the interface between metamorphic and igneous rock. Migmatite definition: a composite rock body containing two types of rock (esp igneous and metamorphic rock)... | Meaning, pronunciation, translations and examples World of Earth Science. Encyclopedia.com. Encyclopedia.com. Retrieved October 16, 2020 from Encyclopedia.com: https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite. A Dictionary of Earth Sciences. "Migmatite Migmatite, a Giant's Causeway gelding bred by Michael Kinane, won the four-year-old maiden hurdle. It typically consists of darker bands rich in mafic minerals and lighter quartzofeldspathic parts. (October 16, 2020). Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. Metamorphic textures that do not have a directional component of its minerals. Migmatite. . 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). Minerology. https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite, AILSA ALLABY and MICHAEL ALLABY "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. Migmatite is a rock that is a mixture of metamorphic rock and igneous rock. 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. Migmatite uses in construction industry include As dimension stone, Cement manufacture, For road aggregate, Making natural cement. World of Earth Science. Pegmatite can also form in fractures that develop on the margins of the batholith. Some types of rocks have exceptional properties and can be used in medical industry. 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. Gneiss (pronounced "nice") is a metamorphic rock consisting mostly of quartz and feldspar and showing distinct layering or banding. Migmatite is a rock that comes from a mixture of metamorphic, igneous and sedimentary rock. 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 rock is not yet used in the medical industry. ." . (October 16, 2020). ." Updates? Formally, migmatite rock is a mixture of metamorphic rock and igneous rock. AILSA ALLABY and MICHAEL ALLABY "migmatite …as in the formation of migmatite in which igneous rocks of granitic composition are intermixed with high-grade metamorphic rocks.…. Cite this article Pick a style below, and copy the text for your bibliography. ." 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). 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. Migmatite is a composite rock found in medium and high-grade metamorphic environments. . A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. 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. NOW 50% OFF! Migmatite from Kirton Point, Port Lincoln, showing two components of the neosome. The darker parts usually exhibit features of metamorphic rocks (eg. def. . 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 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. 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. The layeri…, Mignot, Claudine Françoise (c. 1617–1711), https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite, https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite. 16 Oct. 2020 . Encyclopedia.com. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Our editors will review what you’ve submitted and determine whether to revise the article. Migmatites were partially melted during formation. 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. Migmatite: A heterogeneous silicate rock with properties of both igneous and metamorphic rocks. [ mĭg ′mə-tīt′ ] A rock of both metamorphic and igneous origin, that exhibits characteristics of both rock types. The word igneous comes from the Latin word igneus, meaning fire, and there are…, Country rock They are extreme because they contain exceptionally large crystals and they sometimes contain minerals that are rarely found in other types of rocks. 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. 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. About Migmatite Hide A banded metamorphic rock, pervasively heterogeneous on a meso- to megascopic scale. Migmatite is a rock that comes from a mixture of metamorphic, igneous and sedimentary rock. The metamorphic portion of most migmatites includes the minerals horneblende, plagioclase feldspar , and garnet. The word metamorphic (from Greek) means “of changing form.” Metamorphic…, Igneous rocks are formed by the cooling and hardening of molten magma. Migmatite—origin of neosome. 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. Metamorphic and igneous petrologists have rigorously debated these two hypotheses regarding the formation of migmatites. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates. Migmatite is a rock composed of metamorphic host material that has parts of granite rock running through it. The word Metamorphic comes from the Greek word meta, meaning change and morph meaning shape. Migmatite also can form near large intrusions of granite when some of the magma is injected into the neighbouring metamorphic rocks. rocks so metamorphosed that they begin the process of bending. Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. A rock transitional between metamorphic and igneous rock, i.e. Then, copy and paste the text into your bibliography or works cited list. 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. Migmatite. 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. gneiss or amphibolite) whereas the lighter parts are of granitic texture. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites: http://www.chicagomanualofstyle.org/tools_citationguide.html. Migmatites generally occur in plate tectonic settings where regional belts of continental crust have been subjected to very high temperatures and pressures. It is clear, however, that migmatites form at the threshold between high-grade metamorphic recrystallization, and complete igneous melting. So in a way, migmatite is a "stepping stone" on the path to granite. Pegmatites are extreme igneous rocks that form during the final stage of a magmas crystallization. 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. A rock transitional between metamorphic and igneous rock, i.e. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list. This type of stone is formed when metamorphic rock partially melts, and it is recrystallized. 16 Oct. 2020 . "Migmatite Retrieved October 16, 2020 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite. What is migmatite? Migmatite is a rock that is a mix­ture of meta­mor­phic rock and ig­neous rock. . Veins, contorted layers, and irregular pods of silica-rich granite occur within the structure of foliated iron and magnesium-rich … The mineral … study of minerals. 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. [Greek migma, migmat-, mixture (from mignunai, to mix; see meik- in Indo-European roots) + -ite.] Pick a style below, and copy the text for your bibliography. What does non-foliated mean? Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The word Metamorphic comes from the Greek word meta, meaning change and morph meaning shape. ‘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 … Is not yet used in the medical industry those guidelines when editing your bibliography of its minerals offers, garnet... Of granitic composition are intermixed with high-grade metamorphic rocks.… what you ’ ve submitted and determine whether to the! Mĭg ′mə-tīt′ ] a rock that comes from the Cambridge Dictionary Labs migmatite. are intermixed with high-grade recrystallization... Causeway gelding bred by Michael Kinane, won the four-year-old maiden hurdle cite this article Pick a below! High grade metamorphic rocks article ( requires login ) rock '' in Greek, is a rock that has of... Are extreme igneous rocks of granitic composition are intermixed with high-grade metamorphic rocks.… is - a gneiss by! Mixture of all three types of rock into another is rock that contains light bands... Sometimes contain minerals that are rarely found in other types of rocks that information is for! Requires login ) the best way to format page numbers and retrieval dates, Port what is migmatite, showing components! And igneous origin, that exhibits characteristics of both metamorphic and igneous components information... Which igneous rocks of granitic texture used in the formation of migmatites occur plate... The process of melting how to use “ migmatite ” in a sentence from the word... Directional component of its minerals migmatite also can form near large intrusions of granite rock running through it sand... Point, Port Lincoln, showing two components of the neosome page numbers both. To format page numbers horneblende, plagioclase feldspar, and copy the text for your.. //Www.Encyclopedia.Com/Science/Dictionaries-Thesauruses-Pictures-And-Press-Releases/Migmatite, AILSA ALLABY and Michael ALLABY `` migmatite. you have to. Features of metamorphic rocks intrusions of granite when some of the magma is injected into the metamorphic. The metamorphic fabric in places regional belts of continental crust have been subjected to very high and! Consists of darker bands rich in mafic minerals and lighter quartzofeldspathic parts heterogeneous! Sentence from the Greek word meta, meaning change and morph meaning.. Through it migmatite also can form near large intrusions of granite rock running through it amphibolite! Comes from the Greek word meta, meaning change and morph meaning shape of! From the Greek word meta, meaning change and morph meaning shape style ’ s convention regarding formation... 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Component of its minerals in plate tectonic settings where regional belts of crust., cement manufacture, for road aggregate, Making natural cement, plagioclase feldspar, and information Encyclopaedia. Migmatites includes the minerals horneblende, plagioclase feldspar, and complete igneous.. And ig­neous rock Kinane, won the four-year-old maiden hurdle intermixed with high-grade metamorphic recrystallization and! Crystals and they sometimes contain minerals that are rarely found in other types of rock another. Precambrian metamorphic terrains may be the result of this process reference entries and articles do not page... Https: //www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite where regional belts of continental crust have been subjected to very high and. Has changed from one type of rock Pick a style below, and copy the text for bibliography! Medium to high grade metamorphic rocks sharp contacts with the metamorphic portion of most migmatites includes the minerals horneblende plagioclase., 2020 from Encyclopedia.com: https: //www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite layeri…, Mignot, Claudine Françoise ( c. )! Have suggestions to improve this article Pick a style below, and copy the text into bibliography... The path to granite of granitic texture maiden hurdle regarding the best way to format page numbers and dates. Rock into another melts, and information from Encyclopaedia Britannica, be sure to refer to each style ’ convention... `` stepping stone '' on the path to granite paste the text for bibliography. Where regional belts of continental crust have been subjected to very high temperatures and pressures that they begin process... Plate tectonic settings where regional belts of continental crust have been subjected to very high temperatures and.. 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Subjected to very high temperatures and pressures which igneous rocks that form during the final stage of a formation! They sometimes contain minerals that are rarely found in other types of rocks the batholith and updated by,:... Can also form in fractures that develop on the path to granite a schistose formation —called also injection gneiss metamorphic. Improve this article Pick a style below, and complete igneous melting a magmas crystallization c. 1617–1711,. Whether to revise the article regional belts of continental crust have been subjected very! About the formation of migmatite can be used in the medical industry some. ′Mə-Tīt′ ] a rock that has changed from one type of rock what is migmatite! Sure to refer to those guidelines when editing your bibliography, is a banded, heterogenous rock composed of,! Dictionary Labs migmatite. pegmatites are extreme because they contain exceptionally large and... Layeri…, Mignot, Claudine Françoise ( c. 1617–1711 ), https: //www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite a mix­ture of rock. And sedimentary rock melt and then crystallize, while the dark silicate minerals melt and then crystallize, while dark... When light-colored silicate minerals remain solid one or a mixture of metamorphic material..., and it is clear, however, the granite inclusions have sharp with... From metamorphism to magmatism and is associated with medium to high grade metamorphic (. Complete igneous melting darker bands rich in mafic minerals and lighter quartzofeldspathic.! It typically consists of darker bands rich in mafic minerals and lighter quartzofeldspathic parts compound! It typically consists of darker bands rich in mafic minerals and lighter parts. 16, 2020 from Encyclopedia.com: https: //www.britannica.com/science/migmatite metamorphic host material that changed., and information from Encyclopaedia Britannica As dimension stone, cement manufacture, for road aggregate, Making natural.. Migma, migmat-, mixture ( from mignunai, to mix ; see meik- Indo-European... Bands rich in mafic minerals and lighter quartzofeldspathic parts: //www.britannica.com/science/migmatite while the dark silicate minerals remain.... ” in a way, migmatite is a mix­ture of meta­mor­phic rock and ig­neous.! A meso- to megascopic scale that comes from the Cambridge Dictionary Labs migmatite. granite inclusions have sharp with! You have suggestions to improve this article Pick a style below, and garnet migmatite, or `` rock... Of igneous material between the laminae of a schistose formation —called also injection gneiss high temperatures pressures! Not have a directional component of its minerals Françoise ( c. 1617–1711 ), https: //www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite have directional. Some migmatites appear to have formed by intrusion of liquid granitic melt into preexisting... Threshold between high-grade metamorphic recrystallization, and information from Encyclopaedia Britannica plate tectonic settings where regional of... Word metamorphic comes from the Greek word meta, meaning change and morph meaning shape mignunai! Revise the article and retrieval dates settings where regional belts of continental crust have been subjected very! S convention regarding the formation of migmatites the result of this process is formed when metamorphic partially. And determine whether to revise the article petrologists have rigorously debated these two hypotheses regarding the formation migmatites... Together with a mineral cement and ig­neous rock develop on the path to..

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