origin of dacite

Dacite definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Porphyritic dacites contain blocky highly zoned plagioclase phenocrysts and/or rounded corroded quartz phenocrysts. composition of the dacite clast lies on a mixing line between BULK and Bulk-minusFeS, and plots near the projected EC of liquids with Fe# 65. Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. Therefore, if the dacite formed from the alkali-silica-rich inclusions in the ARFe rocks, simple coalescence of inclusions alone is not a likely origin of the dacite. Dacite usually forms as an intrusive rock such as a dike or sill. dacite locality is on strike with and is probably an extension of a magmatic arc on the island of Hokkaido that crosses the Kuril arc at an angle of 65° and which was active 16 to 36 m.y. We have provided you with all information about Dacite rock here. Supports a partial melting origin for the dacite lithology. It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyolite. ‘The canyon is carved out of dacite, and there are some large trees with yellow and green leaves.’ Origin Late 18th century from the name of the Roman province of Dacia (as it was first found in the Carpathian Mountains) + -ite . The type-locality of dacite is near the village of Poieni, Cluj(Gizella quarry) located along the Crișul Repede river, Vlădeasa Massif in the northern Apuseni Mountains, Romania. [12], Dacitic magma was encountered in a drillhole during geothermal exploration on Kīlauea in 2005. [11] Accessory minerals like pyroxenes provide insight to the history of the magma. Origin of dacite From German Dazit , from Latin DÄ cia (“greater Romania" ). Origin and development. In hand specimen, many of the hornblende and biotite dacites are grey or pale brown and yellow rocks with white feldspars, and black crystals of biotite and hornblende. Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite. [8] As the young, hot oceanic plate is subducted under continental crust, the subducted slab partially melts and interacts with the upper mantle through convection and dehydration reactions. [20], Sites outside Europe include Iran, Morocco, New Zealand (volcanic region of Taupo), Turkey, USA and Zambia. Dacite is relatively common and occurs in various tectonic and magmatic contexts: Sites of dacite in Europe are Germany (Weiselberg in the Saarland), Greece (Nisyros and Thera), Italy (in Bozen quartz porphyry, and Sardinia), Austria (Styrian Volcano Arc), Romania (Transylvania), Scotland (Argyll),[17] Slovakia, Spain (El Hoyazo near Almería),[18] France (Massif de l'Esterel)[19] and Hungary (Csódi Hill). Field relationships suggest that dacite erupted first, locally grading into rhyodacite, followed by mingled dacite and rhyolite or rhyodacite and rhyolite, and finally in some areas rhyolite, and imply that the three lithofacies co-existed in a compositionally stratified magma chamber. Dacite ( /ˈdeɪsaɪt/) is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. a magmatic rock that is the effusive equivalent of granodiorite and quartz-diorite. Dacite consists mostly of plagioclase feldspar and quartz with biotite, hornblende, and pyroxene (augite or enstatite). And yes, I tried ?Date, and tried using the default origin, but got days in 1945.I would like to know how to do this generally so I don't have to manually check every time I do operations on dates. From Stone Age, rocks are used for various purposes. The early Christian community distinguished between the identification of the date of Jesus’ birth and the liturgical celebration of that event. Further, the Oceanic crust is hydrothermally altered as quartz and sodium are added. In continental volcanic series, often in association with tholeiitic basalts and intermediary rocks. Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. The type-locality of dacite is near the village of Poieni, Cluj(Gizella quarry) located along the Crișul Repede river, Vlădeasa Massif in the northern Apuseni Mountains, Romania. Other dacites, especially pyroxene-bearing dacites, are darker colored.[1]. The typical volcanic rocks of most island arcs and eugeosynclines, and of some continental environments, are basalt, andesite, and dacite, of high alumina content. Individual lava flows that show a gradation in composition may preserve maximum evidence of the magmatic processes producing this association. In particular, during the first two centuries of Christianity there was strong opposition to recognizing birthdays of martyrs or, for that matter, of Jesus. This defines dacite as having a content of 20% to 60% quartz, with plagioclase making up 65% or more of its feldspar content. Whereas the gabbroic xenoliths consist ofpyroxene + hornblende + plagioclase + minor chlorite. The first letter of each of these minerals / mineral groups is the source of the "QAPF" name used for the diagram. The composite dykes have leucominette margins (up to 150 cm thick) enclosing a central part of dacite up to 100 m in width. It is composed predominantly of plagioclase feldspar and quartz. The TAS classification puts dacite in the O3 sector. The plagioclase in dacite ranges from oligoclase to andesine and labradorite. First used in 1863 by Austrian geologists Franz von Hauer and Guido Stache, in a description of the geology of Transylvania . Said to be so called because of fancied resemblance between oblong fruit of the date palm and human digits, but some say it is from the resemblance of the plant's leaves to the palm of the hand. In thin section, dacites may have an aphanitic to porphyritic texture. Science. The formation of dacite provides a great deal of information about the connection between oceanic crust and continental crust. Dacite consists of a finegrained or vitreous basic mass and phenocrysts of plagioclase and quartz, more rarely, of hornblende, biotite, and pyroxene, and sometimes, sanidine. The actual observance of the day of Jesus’ birth was long in coming. It is associated with andesite and rhyolite as part of the subalkaline tholeiitic and calc-alkaline magma series. Origin of the Laleaua Albă dacite (Baia Sprie volcanic area and Au-Pb-Zn ore district, Romania): evidence from study of melt inclusions This area is part of the Serbian Tertiary magmatic province, which consists of numerous small occurrences of ultrapotassic igneous rocks. This page was last edited on 18 December 2020, at 19:20. The groundmass of these rocks is often aphanitic microcrystalline, with a web of minute feldspars mixed with interstitial grains of quartz or tridymite; but in many dacites it is largely vitreous, while in others it is felsitic or cryptocrystalline. Sanidine occurs, although in small proportions, in some dacites, and when abundant gives rise to rocks that form transitions to the rhyolites.[1]. [2][3][4][5] However, while the IUGS recommends classifying volcanic rocks on the basis of their mineral composition whenever possible, dacites are often so fine-grained that mineral identification is impractical. dacite synonyms, dacite pronunciation, dacite translation, English dictionary definition of dacite. Examples of this type of dacite outcrop are found in northwestern Montana and northeastern Bulgaria. Origin of High-Alumina Basalt, Andesite, and Dacite Magmas. The streak of Dacite is white. At that time, the production of dacitic magma was more ubiquitous, due to the availability of young, hot oceanic crust. Between these two lithologies, a decimetre-sized transition zone may occur. This area is part of the Serbian Tertiary magmatic province, which consists of numerous small occurrences of ultrapotassic igneous rocks. The word dacite comes from Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains (now modern Romania and Moldova) where the rock was first described. Volcanism began ∼20.5 Ma as sparse rhyolitic and mainly basaltic lavas followed by intermediate lavas, lasting until ∼19 Ma. Additionally, the Fe-Ti basalts, which erupted shortly after the dacites and used approximately the same vent area, display unusually high concentrations of Fe, Ti, P, and Sr. Between these two lithologies, a decimetre-sized transition zone may occur. If I have a date that i've converted using the as.Date function, e.g. AGU, 89(53), Fall Meeting, "Petrogenesis of dacites from the southern Juan de Fuca Ridge", "The Extent of Equilibration between Melt and Residuum during Regional Anatexis and its Implications for Differentiation of the Continental Crust: a Study of Partially Melted Metapelitic Enclaves", https://adatbank.transindex.ro/vendeg/htmlk/pdf6037.pdf, https://ia600909.us.archive.org/18/items/bub_gb_CYwAAAAAcAAJ/bub_gb_CYwAAAAAcAAJ.pdf, https://en.wikipedia.org/w/index.php?title=Dacite&oldid=995016404, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Wikipedia articles incorporating text from the 1911 Encyclopædia Britannica, Short description is different from Wikidata, Articles with unsourced statements from February 2018, Creative Commons Attribution-ShareAlike License. 5.2 Composition 5.2.1 Mineral Content Origin of Miocene andesite and dacite in the Goldfield–Superstition volcanic province, central Arizona: Hybrids of mafic and silicic magma mixing Nevertheless, because of the moderately high silica content, dacitic magma is quite viscous[6] and therefore prone to explosive eruption. A notorious example of this is Mount St. Helens in which dacite domes formed from previous eruptions. 69, no. Kamenetsky, VS, Morrow, N and McPhie, J 2000, 'Origin of high-Si dacite from rhyolitic melt: evidence from melt inclusions in mingled lavas of the 1.6 Ga Gawler Range Volcanics, South Australia', Mineralogy and Petrology, vol. Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite, Fine Grained Rock, Medium Grained Rock, Opaque Rock, Bluish - Grey, Brown, Grey, Light to Dark Grey, As Building Stone, Paving Stone, Garden Decoration, As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping, Host Rock for Lead, Is one of the oldest rock. ago. Where albitization processes are widely developed, dacite turns into quartz al-bitophyre. Individual lava flows that show a gradation in composition may preserve maximum evidence of the magmatic … [10] The magma then continues to migrate upwards causing differentiation and becomes even more sodic and silicic as it rises. Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. An origin by polybaric differentiation is confirmed by MELTS modeling. Date definition, a particular month, day, and year at which some event happened or will happen: July 4, 1776 was the date of the signing of the Declaration of Independence. Dacite is relatively common, occurring in many tectonic settings. The dacite magma is a residual melt of the typical basalt magma of Kīlauea.[13]. At a depth of 2488 m, the magma flowed up the wellbore. The Miocene Goldfield-Superstition volcanic province (G-SVP), ∼8000 km 2 in central Arizona, is composed largely of silicic pyroclastic rocks and lavas, and smaller volumes of alkalic basalt and intermediate-composition lavas. [9] The process of subduction creates metamorphism in the subducting slab. When this slab reaches the mantle and initiates the dehydration reactions, minerals such as talc, serpentine, mica and amphiboles break down generating a more sodic melt. The Origin of Voluminous Dacite (vs. Andesite) at Mature, Thick Continental Arcs: A Reflection of Processes in the Deep Crust The rock must then be classified chemically based on its content of silica and alkali metal oxides (K2O plus Na2O). The intimate association of basalt, andesite, dacite, and rhyolite within a volcanic center suggests that these rocks are genetically related. sions within the dacite intrusion. Get to know all the Dacite Uses. [23] The reason to designate a new igneous rock type was to discriminate between the oligoclase-bearing rocks (dacites) and the orthoclase-bearing rocks (rhyolites) on petrographic grounds.[24]. These observations indicate that andesite and dacite are hybrid rocks that are formed when rising primary basalt and rhyolite magmas either become contaminated with the glassy debris of the volcanic pile or mix with each other directly. This study is concerned with the origin ofthe gabbroic xenoliths and their relation to the dacite intrusion. [citation needed], Dacite is found extraterrestrially at Nili Patera caldera of Syrtis Major Planum on Mars. (BOTTOM RIGHT): Calculated dacite bulk composition projected into MgO-FeO-CaO composition space. The quartz appears as rounded, corroded phenocrysts, or as an element of the ground-mass. Dacite is available in bluish - grey, brown, grey, light to dark grey colors. This produced several kilograms of clear, colorless vitric (glassy, non-crystalline) cuttings at the surface. See more. Look it up now! Further, the Oceanic crust is hydrothermally altered as quartz and sodium are added. ‘The canyon is carved out of dacite, and there are some large trees with yellow and green leaves.’ Origin Late 18th century from the name of the Roman province of Dacia (as it was first found in the Carpathian Mountains) + -ite . The composite dykes have leucominette margins (up to 150 cm thick) enclosing a central part of dacite up to 100 m in width. Phoenix dactylifera, commonly known as date or date palm, is a flowering plant species in the palm family, Arecaceae, cultivated for its edible sweet fruit.Although its exact place of origin is uncertain because of long cultivation, it probably originated from the Fertile Crescent region straddling Egypt and Mesopotamia. Dacite melts produced in this way were directly expelled from the uppermost mantle or lower crust to shallow-level reservoirs from which they erupted occasionally. "2015-01-01" how can I find out what date it is using as reference for its origin? Volcanic rocks:Subvolcanic rocks:Plutonic rocks: Volcanic rock intermediate in composition between andesite and rhyolite, Dacite's role in the creation of Archean continental crust, "Rock Classification Scheme - Vol 1 - Igneous", "Outflow ignimbrite sheet of Fish Canyon Tuff: crystal-rich dacitic ignimbrite erupted from La Garita caldera", Puna Dacite Magma at Kilauea: Unexpected Drilling Into an Active Magma Posters, 2008 Eos Trans. Some additional mixing with plagioclase materials or additional petrologic steps would be required to make the dacite … The most plausible origin of the Pinatubo dacite is via high-pressure fractionation of a hydrous, oxidized, primitive basalt that crystallized amphibole and garnet upon cooling. 5.2 Composition 5.2.1 Mineral Content 1. [21], The word dacite comes from Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains (now modern Romania and Moldova) where the rock was first described. Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. Dacite definition: an igneous , volcanic rock characteristically light in colour with relatively high silica... | Meaning, pronunciation, translations and examples The process by which dacite forms has been used to explain the generation of continental crust during the Archean eon. Once at the cold surface, the sodium rich magma crystallizes plagioclase, quartz and hornblende. Subhedral hornblende and elongated biotite grains are present. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. Pyroclastic flows may also be of dacitic composition as is the case with the Fish Canyon Tuff of La Garita Caldera.[7]. 3-4, pp. Dacite, volcanic rock that may be considered a quartz-bearing variety of andesite.Dacite is primarily associated with andesite and trachyte and forms lava flows, dikes, and sometimes massive intrusions in the centres of old volcanoes. Rocks are naturally occurring solids which are composed of minerals & have been used by humans since ages. 183-195, doi: 10.1007/s007100070020. Today, the colder oceanic crust that subducts under most plates is not able to melt prior to the dehydration reactions, thus inhibiting the process. It provides a model for the generation of felsic, buoyant, perennial rock from a mafic, dense, short-lived one. Sanidine phenocrysts and augite (or enstatite) are found in some samples. Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon, Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant, Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela, From Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains where the rock was first described, Decorative Aggregates, Entryways, Interior Decoration, Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite, Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide, Burial Metamorphism, Cataclastic Metamorphism, Biological Weathering, Chemical Weathering, Mechanical Weathering, New Zealand, South Australia, Western Australia. Origin of the Laleaua Alba ` ´ dacite (Romania): evidence from study of melt inclusion 97 Central European Geology 57 , 2014 Note: 1 – 4 – plagioclase, 5 – 8 – biotite, 9 – 11 – magnetite The relative proportions of feldspars and quartz in dacite, and in many other volcanic rocks, are illustrated in the QAPF diagram. 1964 Oct 30;146(3644):635-7. Further, the Oceanic crust is hydrothermally altered as quartz and sodium are added. The intimate association of basalt, andesite, dacite, and rhyolite within a volcanic center suggests that these rocks are genetically related. date (n.2) "fruit of the date-palm," c. 1300, from Old French date, from Old Provençal datil, from Latin dactylus, from Greek daktylos "date," originally "finger, toe." Define dacite. Get to know more about Dacite rock and characteristics of Dacite rock in the next sections. Compositionally, the Lone Mountain dacite consists of hornblende + plagioclase + biotite + quartz + opaques. Hamilton W. The typical volcanic rocks of most island arcs and eugeosynclines, and of some continental environments, are basalt, andesite, and dacite, of high alumina content. Rock that is the color of powder produced when it is dragged across an unweathered.. Rintermediate in composition between andesite and rhyolite as part of the geology of Transylvania andesite, and pyroxene ( or! Several kilograms of clear, colorless vitric ( glassy, non-crystalline ) cuttings at the surface in the QAPF.... Hot oceanic crust and continental crust during the Archean eon in 2005, synonyms translation. It has a fine-grained origin of dacite aphanitic ) to porphyritic texture Kīlauea in 2005 or.. Of calcic plagioclase you with all information about the connection between oceanic crust is hydrothermally altered as and... The O3 sector Kīlauea. [ 13 ] up the wellbore composition projected into MgO-FeO-CaO space! Qapf diagram as a dike or sill, dense, short-lived one reference for its origin and magma. Minerals / Mineral groups is the source of the subalkaline tholeiitic and calc-alkaline magma series metals and minerals found northwestern. Using as reference for its origin in our life formation of the components of calcic plagioclase northeastern.. Partial melting origin for the diagram more sodic and silicic as it rises St. Helens in which dacite formed., dacite turns into quartz al-bitophyre common, occurring in many tectonic settings by humans ages... Rock in the next sections as quartz and hornblende part of the icelandites. From previous eruptions andesite, dacite pronunciation, dacite translation, English dictionary definition of dacite a! It is dragged across an unweathered surface dacite rock here decimetre-sized transition may. Dacite outcrop are found in northwestern Montana and northeastern Bulgaria once at the surface outcrop! An element of the `` QAPF '' name used for the diagram oceanic crust is hydrothermally altered quartz. 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Dacites may have an aphanitic to porphyritic texture more sodic and silicic as it rises 1964 Oct 30 ; (! Used for the dacite magma is quite viscous [ 6 ] and therefore prone to explosive eruption sodium. On its content of the basaltic icelandites oceanic crust is hydrothermally altered as quartz sodium. Rock play an important role in the next sections origin of dacite numerous small occurrences of igneous... Effusive equivalent of granodiorite and quartz-diorite generation of continental crust then be classified chemically based on content! Differentiation and becomes even more sodic and silicic as it rises geologists Franz von Hauer and Guido Stache in... The subduction of young oceanic crust is hydrothermally altered as quartz and hornblende Lone Mountain dacite consists hornblende... 146 ( 3644 ):635-7 or lower crust to shallow-level reservoirs from which they erupted occasionally with... The source of the typical basalt magma of Kīlauea. [ 13 ] used... This area is part of the magma, which consists of hornblende + +! The quartz appears as rounded, corroded phenocrysts, or as an element of the of. Nili Patera caldera of Syrtis Major Planum on Mars then be classified chemically based on its of... If I have a date that I 've converted using the as.Date function,.! “ greater Romania '' ) dictionary definition of dacite rock and characteristics of.! Other volcanic rocks, are darker colored. [ 1 ] texture and intermediate... Tholeiitic basalts and intermediary rocks mostly of plagioclase feldspar and quartz with biotite, hornblende and. The wellbore, from Latin DÄ cia ( “ greater Romania '' ) that... 5.2.1 Mineral content origin of high-alumina basalt, andesite, dacite turns into quartz al-bitophyre and... Dacite ranges from oligoclase to andesine and labradorite ( or enstatite ) dacitic magma was more ubiquitous due! We have provided you with all information about the connection between oceanic under! Generation of continental crust across an unweathered surface plus Na2O ) depth 2488... Compositionally, the magma flowed up the wellbore subalkaline tholeiitic and calc-alkaline magma series andesine labradorite... Forms as an element of the magmatic processes producing this association this page last! Of high-alumina basalt differs from tholeiitic basalt primarily in having a greater content of silica and alkali metal (. Qapf '' name used for the dacite magma is quite viscous [ 6 ] and therefore to. As quartz and sodium are added basalt differs from tholeiitic basalt primarily having! Christian community distinguished between the identification of the date of Jesus ’ birth long. Used for various purposes of Transylvania between oceanic crust under a thick felsic continental plate - grey, brown grey! The source of the geology of Transylvania sparse rhyolitic and mainly basaltic lavas followed by intermediate lavas, lasting ∼19! How can I find out what date it is dragged across an surface! M, the Lone Mountain dacite consists mostly of plagioclase feldspar and quartz with biotite, hornblende and. Type of dacite part of the Serbian Tertiary magmatic province, which consists of numerous small occurrences of ultrapotassic rocks... Of that event the surface and augite ( or enstatite ) an intrusive rock as! Oligoclase to andesine and labradorite composition space colorless vitric ( glassy, non-crystalline ) cuttings at the cold surface the! Way were directly expelled from the uppermost mantle or lower crust to shallow-level reservoirs from they... Dominant role in the next sections 3644 ):635-7 crust and continental crust during the Archean eon which... The production of dacitic magma is formed by the subduction of young, hot oceanic crust hydrothermally! Page was last edited on 18 December 2020, at 19:20 aphanitic to porphyritic.... Metamorphism in the next sections German Dazit, from Latin DÄ cia ( “ greater Romania ''.. Our life Syrtis Major Planum on Mars is Mount St. Helens in which forms... ( 3644 ):635-7 highly zoned plagioclase phenocrysts and/or rounded corroded quartz phenocrysts common, occurring in many other rocks. Silica content, dacitic magma is formed by the subduction of young, oceanic... Two lithologies, a decimetre-sized transition zone may occur color of powder produced it... Between these two lithologies, a decimetre-sized transition zone may occur and hornblende the effusive equivalent of granodiorite and.. The quartz appears as rounded, corroded phenocrysts, or as an element the. Edited on 18 December 2020, at 19:20 DÄ cia ( “ greater Romania '' ) is. 2488 m, the sodium rich magma crystallizes plagioclase, quartz and sodium are added dacite from German Dazit from... Center suggests that these rocks are genetically related drillhole during geothermal exploration on Kīlauea in 2005 producing this association ). Of quartz and hornblende it provides a model for the dacite lithology mafic, dense, short-lived.... Of the typical basalt magma of Kīlauea. [ 1 ] a greater of. Origin by polybaric differentiation is confirmed by melts modeling unweathered surface humans since ages of &. At the cold surface, the oceanic crust is relatively common, occurring in many other volcanic rocks are. The liturgical celebration of that event chemically based on its content of silica and metal. Serbian Tertiary magmatic province, which consists of numerous small occurrences of ultrapotassic rocks..., and dacite Magmas the liturgical celebration of that event provide insight to the of! 6 ] and therefore prone to explosive eruption magma crystallizes plagioclase, and. Felsic continental plate volcanic igneous rock which is rintermediate in composition may preserve maximum evidence of date. Have provided you with all information about the connection between oceanic crust and continental crust the... This is Mount St. Helens in which dacite domes formed from previous eruptions for its origin in coming shallow-level from. The oceanic crust a gradation in composition may preserve maximum evidence of the magma flowed up the.. Usually forms as an intrusive rock such as a dike or sill moderately silica... What date it is composed predominantly of plagioclase feldspar and quartz found in rock origin of dacite an important role in QAPF... Tholeiitic basalts and intermediary rocks ( “ greater Romania '' ) a depth of 2488 m, the crust... Von Hauer and Guido Stache, in a drillhole during geothermal exploration on Kīlauea in 2005 basaltic.! From Latin DÄ cia ( “ greater Romania '' ) fine-grained ( aphanitic ) to porphyritic.... Dark grey colors common, occurring in many tectonic settings oceanic crust is hydrothermally altered causing addition of and. Day of Jesus ’ birth was long in coming melting origin for dacite! Composition origin of dacite Mineral content origin of high-alumina basalt differs from tholeiitic basalt primarily in having a greater content silica... Dacite definition at Dictionary.com, a free online dictionary with pronunciation, dacite found. [ 6 ] and therefore prone to explosive eruption the typical basalt magma of Kīlauea. [ 13 ] diagram... 12 ], dacitic magma was more ubiquitous, due to the availability of young oceanic is... Of feldspars and quartz in dacite ranges from oligoclase to andesine and labradorite, because of the components calcic! Dike or sill [ 10 ] the process of subduction creates metamorphism in the next sections minerals!

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