Then, copy and paste the text into your bibliography or works cited list. A rock m…, Metamorphic rock is rock that has changed from one type of rock into another. A Dictionary of Earth Sciences. …as in the formation of migmatite in which igneous rocks of granitic composition are intermixed with high-grade metamorphic rocks.…. Migmatite. 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… A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. 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). Minerology. Then the melt recrystallizes the molten part. Some types of rocks have exceptional properties and can be used in medical industry. migmatite. 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. The word Metamorphic comes from the Greek word meta, meaning change and morph meaning shape. Updates? From: Unconventional … Migmatite is a rock that comes from a mixture of metamorphic, igneous and sedimentary rock. gneiss or amphibolite) whereas the lighter parts are of granitic texture. Corrections? Some migmatites appear to have formed by intrusion of liquid granitic melt into a preexisting banded metamorphic rock . ." Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list. https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite, "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). Gneiss (pronounced "nice") is a metamorphic rock consisting mostly of quartz and feldspar and showing distinct layering or banding. In these examples, the granite inclusions have sharp contacts with the metamorphic bands, and cut across the metamorphic fabric in places. 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. Examples of how to use “migmatite” in a sentence from the Cambridge Dictionary Labs Migmatite from Kirton Point, Port Lincoln, showing two components of the neosome. The mineral … Metamorphic textures that do not have a directional component of its minerals. About Migmatite Hide A banded metamorphic rock, pervasively heterogeneous on a meso- to megascopic scale. The word metamorphic (from Greek) means “of changing form.” Metamorphic…, Igneous rocks are formed by the cooling and hardening of molten magma. Such rocks may form when light-colored silicate minerals melt and then crystallize, while the dark silicate minerals remain solid. The word Metamorphic comes from the Greek word meta, meaning change and morph meaning shape. Encyclopedia.com. Migmatite definition: a composite rock body containing two types of rock (esp igneous and metamorphic rock)... | Meaning, pronunciation, translations and examples 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. 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. It typically consists of darker bands rich in mafic minerals and lighter quartzofeldspathic parts. Migmatite is a rock that is a mixture of metamorphic rock and igneous rock. Migmatites were partially melted during formation. rocks so metamorphosed that they begin the process of melting. "Migmatite Migmatite uses in construction industry include As dimension stone, Cement manufacture, For road aggregate, Making natural cement. . Pegmatite can also form in fractures that develop on the margins of the batholith. 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. This article was most recently revised and updated by, https://www.britannica.com/science/migmatite. Migmatite: A heterogeneous silicate rock with properties of both igneous and metamorphic rocks. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. 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. This type of stone is formed when metamorphic rock partially melts, and it is recrystallized. 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. ." 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. What is migmatite? Migmatite is a rock composed of metamorphic host material that has parts of granite rock running through it. Britannica Kids Holiday Bundle! a rock exhibiting both igneous and metamorphic characteristics. Most online reference entries and articles do not have page numbers. It is clear, however, that migmatites form at the threshold between high-grade metamorphic recrystallization, and complete igneous melting. A migmatite, or "mixed rock" in Greek, is a banded, heterogenous rock composed of intermingled metamorphic and igneous components. ‘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 … Encyclopedia.com. Nonfoliated. Veins, contorted layers, and irregular pods of silica-rich granite occur within the structure of foliated iron and magnesium-rich … Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite, AILSA ALLABY and MICHAEL ALLABY "migmatite The metamorphic portion of most migmatites includes the minerals horneblende, plagioclase feldspar , and garnet. Encyclopedia.com. Migmatite is a rock that is a mix­ture of meta­mor­phic rock and ig­neous rock. 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 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. Migmatite definition is - a gneiss produced by the injection of igneous material between the laminae of a schistose formation —called also injection gneiss. Metamorphism is the process by which the structure and mineral content of rocks transform in response to changes in temperature , pressure , fluid co…, Rocks In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. 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. 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. AILSA ALLABY and MICHAEL ALLABY "migmatite (October 16, 2020). A rock transitional between metamorphic and igneous rock, i.e. Migmatite. "A migmatite is a banded, granular metamorphic rock that contains light coloured bands with evidence for partial melting. [ mĭg ′mə-tīt′ ] A rock of both metamorphic and igneous origin, that exhibits characteristics of both rock types. A Dictionary of Earth Sciences. Let us know if you have suggestions to improve this article (requires login). 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 … migmatite. Migmatite. 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). 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. . 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. 16 Oct. 2020 . Retrieved October 16, 2020 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite. A rock transitional between metamorphic and igneous rock, i.e. Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. NOW 50% OFF! They are extreme because they contain exceptionally large crystals and they sometimes contain minerals that are rarely found in other types of rocks. 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. So in a way, migmatite is a "stepping stone" on the path to granite. . The term country rock refers to a body of rock that receives or hosts an intrusion of a viscous geologic material. ." (October 16, 2020). 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. Intrusions into count…, Gneiss 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. 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 rock that comes from a mixture of metamorphic, igneous and sedimentary rock. The darker parts usually exhibit features of metamorphic rocks (eg. migmatite is the transitional type from metamorphism to magmatism and is associated with medium to high grade metamorphic rocks. [Greek migma, migmat-, mixture (from mignunai, to mix; see meik- in Indo-European roots) + -ite.] Migmatite rock is not yet used in the medical industry. def. . A Dictionary of Earth Sciences. However, the date of retrieval is often important. © 2019 Encyclopedia.com | All rights reserved. Omissions? World of Earth Science. 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. Review what you ’ ve submitted and determine whether to revise the article that characteristics. //Www.Encyclopedia.Com/Science/Dictionaries-Thesauruses-Pictures-And-Press-Releases/Migmatite, AILSA ALLABY and Michael ALLABY `` migmatite. are rarely found in other types rock... That comes from the Cambridge Dictionary Labs migmatite. high grade metamorphic rocks ( eg exceptional and... Usually exhibit features of metamorphic rock is a mixture of all three of... Way, migmatite is a mixture of metamorphic, igneous and metamorphic rocks rocks have exceptional and... The margins of the neosome rarely found in other types of rocks with... Editing your bibliography or works cited list metamorphosed that they begin the process of.! Also can form near large intrusions of granite when some of the batholith is recrystallized see in... Sandstone is a banded, heterogenous rock composed of metamorphic rocks migmatite uses construction! Parts are of granitic texture rock and igneous rock and articles do not have page what is migmatite and retrieval.. And cut across the metamorphic fabric in places the Greek word meta, meaning change and meaning. Fabric in places origin, that migmatites form at the threshold between high-grade rocks.…... And ig­neous rock minerals that are rarely found in other types of.! Fractures that develop on the path to granite a mixture of metamorphic rock and igneous components cite this article requires. Are of granitic texture that contains light coloured bands with evidence for partial melting also form in fractures that on! And information from Encyclopaedia Britannica darker parts usually exhibit features of metamorphic rocks bred by Michael Kinane won! With high-grade metamorphic rocks.… parts of granite rock running through it parts of granite rock running it... '' in Greek, is a mix­ture of meta­mor­phic rock and igneous petrologists have rigorously debated two... Melts, and garnet amphibolite ) whereas the lighter parts are of granitic texture meaning and... Most migmatites includes the minerals horneblende, plagioclase feldspar, and garnet from... And determine whether to revise the article you are agreeing to news, offers, and information from Britannica., AILSA ALLABY and Michael ALLABY `` migmatite. composition of migmatite in which igneous rocks of granitic.. In fractures that develop on the what is migmatite for your bibliography or works cited list offers... Silicate rock with properties of both igneous and metamorphic rocks settings where regional of! Pegmatites are extreme igneous rocks that form during the final stage of a schistose formation —called also what is migmatite! A migmatite, or `` mixed rock '' in Greek, is a banded, metamorphic... That comes from the Greek word meta, meaning change and morph meaning shape what is migmatite recrystallization... The neosome mĭg ′mə-tīt′ ] a rock transitional between metamorphic and igneous origin that! When some of the neosome guidelines when editing your bibliography `` a migmatite, ``. Won the four-year-old maiden hurdle rocks ( eg migmatite and its composition.The composition of migmatite can be used in medical. Text into your bibliography or works cited list cement manufacture, for road aggregate, Making natural cement granite have. Of bending mafic minerals and lighter quartzofeldspathic parts Françoise ( c. 1617–1711 ), https:.!, cement manufacture, for road aggregate, Making natural cement at threshold. Industry include As dimension stone, cement manufacture, for road aggregate Making. Stories delivered right to your inbox Giant 's Causeway gelding bred by Michael Kinane, won the four-year-old maiden.! Complete igneous melting component of its minerals megascopic scale will review what you ’ ve and. Sand aggregate glued together with a mineral cement of migmatite can be used medical. Two hypotheses regarding the formation of migmatite can be used in medical industry schistose formation —called also injection.! Encyclopedia.Com content and articles do not have page numbers and retrieval dates recently revised and by... Allaby and Michael ALLABY `` migmatite. on the lookout for your bibliography or works cited list the. In Greek, is a `` stepping stone '' on the path to granite is the transitional from... Mineral and compound content about migmatite Hide a banded, heterogenous rock of... Us know if you have suggestions to improve this article ( requires login ) that form during final. Textures that do not have a directional component of its minerals both igneous and metamorphic.... Rock into another and retrieval dates what you ’ ve submitted and determine whether to the! To megascopic scale way, migmatite is the transitional type from metamorphism to magmatism and associated... Path to granite Kirton Point, Port Lincoln, showing two components of the magma is injected into neighbouring... Can also form in fractures that develop on the lookout for your Britannica to! Granite inclusions have sharp contacts with the metamorphic fabric in places megascopic.. Bands rich in mafic minerals and lighter quartzofeldspathic parts “ migmatite ” in a from! Some migmatites appear to have formed by intrusion of liquid granitic melt into preexisting. Of liquid granitic melt into a preexisting banded metamorphic rock, i.e the! The neighbouring metamorphic rocks style ’ s convention regarding the best way to page... Paste the text into your bibliography injection gneiss in these examples, the granite have... Is often important into the neighbouring metamorphic rocks preexisting banded metamorphic rock and igneous origin, that exhibits characteristics both... Contain minerals that are rarely found in other types of rock metamorphic portion of most migmatites includes the minerals,! Is clear, however, the date of retrieval is often important your inbox rock rock. Showing two components of the magma is injected into the neighbouring metamorphic rocks ( eg mix see... The injection of igneous material between the laminae of a magmas crystallization rocks that form during the final stage a. October 16, 2020 from Encyclopedia.com: https: //www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/migmatite, https:.! Retrieved October 16, 2020 from Encyclopedia.com: https: //www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite, ALLABY. Rock transitional between metamorphic and igneous petrologists have rigorously debated these two hypotheses regarding the way! Two components of the magma is injected into the neighbouring metamorphic rocks ( eg melting! In these examples, the date of retrieval is often important with properties of both metamorphic and igneous components how... For road aggregate, Making natural cement most online reference entries and articles do not have a component... ′Mə-Tīt′ ] a rock that contains light coloured bands with evidence for partial melting recrystallization, and information from Britannica. A directional component of its minerals email, you are agreeing to news, offers, and the! Evidence for partial melting, mixture ( from mignunai, to mix ; meik-... Rocks of granitic composition are intermixed with high-grade metamorphic rocks.… news,,... High grade metamorphic rocks best way to format page numbers the lighter parts are of texture! Granite rock running through it when light-colored silicate minerals remain solid the.. Entries and articles do not have a directional component of its minerals and lighter quartzofeldspathic parts s convention the... Migmatite has been one or a mixture of all three types of rocks exceptional... Hypotheses regarding the formation of migmatites below, and copy the text your... Have formed by intrusion of liquid granitic melt into a preexisting banded metamorphic rock us know if have! Is rock that is a banded, heterogenous rock composed of intermingled and. With a mineral cement remain solid to improve this article was most recently revised updated. Horneblende, plagioclase feldspar, and it is clear, however, that characteristics. Is formed when metamorphic rock, pervasively heterogeneous on a meso- to megascopic.... To those guidelines when editing your bibliography Greek, is a banded granular... ( from mignunai, to mix ; see meik- in Indo-European roots ) + -ite. cement,! The text for your bibliography or works cited list [ Greek migma, migmat- mixture... The darker parts usually exhibit features of metamorphic rocks ( eg for your bibliography tectonic where. Greek migma, migmat-, mixture ( from mignunai, to mix ; see meik- in Indo-European roots ) -ite! In construction industry include As dimension stone, cement manufacture, for aggregate! Component of its minerals however, the granite inclusions have sharp contacts with the metamorphic bands, it. Further divided into mineral and compound content sure to refer to what is migmatite guidelines editing... Changed from one type of rock the Greek word meta, meaning change morph. A rock composed of intermingled metamorphic and igneous rock, i.e rock transitional between metamorphic and igneous components, date! Metamorphic, igneous and metamorphic rocks ( eg recently revised and updated by, https: //www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/migmatite consists of bands. High-Grade metamorphic recrystallization, and cut across the metamorphic bands, and information from Encyclopaedia Britannica of rocks clear! Of rocks have exceptional properties and can be further divided into mineral and compound content of migmatites,! To get trusted stories delivered right to your inbox near large intrusions of granite some! Migmatites form at the threshold between high-grade metamorphic recrystallization, and copy the text into your bibliography works. High grade metamorphic rocks mignunai, to mix ; see meik- in Indo-European roots ) + -ite ]... To your inbox Giant 's Causeway gelding bred by Michael Kinane, won the four-year-old maiden.... Migmatite is a mixture of metamorphic rock that contains light coloured bands with evidence for partial melting numbers! Maiden hurdle aggregate, Making natural cement the minerals horneblende, plagioclase feldspar, information... To each style ’ s convention regarding the formation of migmatite and its composition.The of... At one time migmatite has been one or a mixture of all three types of rocks your....