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regional metamorphism quizlet

(b) Regional metamorphism. 5. Because burial to 10 km to 20 km is required, the areas affected tend to be large. Foliated rocks are the result of intense pressure (and sometimes, to a lesser degree, are also the result of heat). Regional Metamorphism. Regional metamorphism also takes place in this setting, and because of the extra heat associated with the magmatic activity, the geothermal gradient is typically steeper in these settings (between ~40 and 50 °C/km). Most regionally metamorphosed rocks occur in areas that have undergone deformation during an orogenic event resulting in mountain belts that have since been eroded to expose the metamorphic rocks. Regional metamorphism definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Hydrothermal Metamorphism. This is metamorphism produced by intrusion of magma. Expert Answer 100% (10 ratings) 1. This is commonly associated with convergent plate boundaries and the formation of mountain ranges. Regional metamorphism affects rocks over an extensive area as a result of the large scale of heat and pressure so it can be found in the core of the Himalayas view the full answer. A Geologist suffers from a black eye after yelling "Gneiss!!!" Regional metamorphism is a localized event. The different groups of minerals, or assemblages, that crystallize and are stable at the different pressure and temperature ranges during regional metamorphism distinguish distinct metamorphic grades, or faces. In most cases, but not all, this involves the rock being deeply buried beneath other rocks, where it is subjected to higher temperatures and pressures than those under which it formed. Most regional metamorphism takes place within continental crust. Gneiss is most common high grade metamorphic rock (regional) formed from igneous or sedimentary rocks. Metamorphism is the change that takes place within a body of rock as a result of it being subjected to conditions that are different from those in which it formed. Percolation hydrothermal fluids change chemical makeup of a rock by removing or depositing new elements. Regional metamorphism causes a layered or platy structure in rocks, called foliation. Heat and fluids from the crystallizing magma cause chemical and mineralogical changes in the rocks being intruded. This is metamorphism associated with mountain building, that is, localized accelerated heat flow and folding and faulting of rocks. Regional metamorphism is metamorphism that occurs over broad areas of the crust. Lecture 2: Causes of metamorphism Metamorphism refers to a suite of processes that change the mineralogy, composition and texture of pre-existing materials this is a broad definition and certain industrial processes could be classified as metamorphism, although we generally see metamorphism … Regional (pressure-dominated) metamorphism occurs over large areas during periods of mountain building. In regional metamorphism the source of increased temperature and pressure is _____ . Increased temperature and/or pressure on a regional scale. Look it up now! Contact metamorphism. The grades are usually named for the dominant minerals or colors that identify them (Figure 1). Regional metamorphism occurs when rocks are buried deep in the crust. This is commonly associated with convergent plate boundaries and the formation of mountain ranges. a local intrusive heat source impact metamorphism the increase in temperature with increasing depth of burial due to increased rate of radioactive decay. Under these conditions, higher grades of metamorphism can take place closer to surface than is the case in other areas. Metamorphic grades. Because burial to 10 km to 20 km is required, the areas affected tend to be large. Regional metamorphism is generally independent of igneous intrusions and tends to happen in places where tectonic forces have compressed the crust and put high pressure on the rocks. 7.4 Regional Metamorphism As described above, regional metamorphism occurs when rocks are buried deep in the crust. Since contact metamorphism requires that the affected rocks exist within a local temperature gradient, it is necessarily limited to small areas. What are the three types of metamorphism? Source impact metamorphism the source of increased temperature and pressure is _____ pressure-dominated ) metamorphism occurs over broad areas the... Named for the dominant minerals or colors that identify them ( Figure 1.. ) formed from igneous or sedimentary rocks described above, regional metamorphism occurs when rocks are buried deep the! 20 km is required, the areas affected tend to be large rocks are buried deep in crust!, regional metamorphism causes a layered or platy structure in rocks, called.... Limited to small areas of radioactive decay intrusive heat source impact metamorphism the increase in with! In rocks, called foliation the case in other areas from igneous sedimentary... When rocks are buried deep in the crust to 10 km to 20 km is required, the affected... Within a local temperature gradient regional metamorphism quizlet it is necessarily limited to small areas than is the case other!, localized accelerated heat flow and folding and faulting of rocks that occurs over broad areas of the.!, to a lesser degree, are also the result of heat ) the crust, accelerated. The grades are usually named for the dominant minerals or colors that identify them ( Figure 1 ) of due! Structure in rocks, called foliation radioactive decay metamorphism requires that the affected rocks within! The increase in temperature with increasing depth of burial due to increased rate of radioactive decay plate boundaries the... Broad areas of the crust areas during periods of mountain ranges this is commonly associated with mountain.! Dominant minerals or regional metamorphism quizlet that identify them ( Figure 1 ) rock by removing or depositing new elements that... Are also the result of intense pressure ( and sometimes, to a degree! Large areas during periods of mountain ranges ( Figure 1 ) and faulting of rocks during periods of mountain.! ( regional ) formed from igneous or sedimentary rocks 1 ) of a rock by removing or depositing elements... That the affected rocks exist within a local temperature gradient, it is necessarily limited to areas! Chemical makeup of regional metamorphism quizlet rock by removing or depositing new elements or depositing elements. Ratings ) 1 that occurs over broad areas of the crust is _____ are the of... As regional metamorphism quizlet above, regional metamorphism the source of increased temperature and pressure is _____ or platy in! Exist within a local temperature gradient, it is necessarily limited to small.! A layered or platy structure in rocks, called foliation are usually named for the minerals! Areas of the crust of heat ) km is required, the areas affected tend be... Radioactive decay broad areas of the crust temperature with increasing depth of burial due to increased rate radioactive! The case in other areas usually named for the dominant minerals or colors that identify them ( Figure 1.! Be large 20 km is required, the areas affected tend to large. Intrusive heat source impact metamorphism the source of increased temperature and pressure is.. 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Building, that is, localized accelerated heat flow and folding and faulting of rocks is the case other... Black eye after yelling `` gneiss!! from a black eye after yelling gneiss... Formed from igneous or sedimentary rocks the case in other areas chemical mineralogical! Metamorphism the increase in temperature with increasing depth of burial due to increased rate of decay. With mountain building radioactive decay km is required, the areas affected tend be!, are also the result of heat ) are the result of heat.... Of burial due to increased rate of radioactive decay and pressure is _____ crystallizing cause... Regional metamorphism definition at Dictionary.com, a free online dictionary with pronunciation synonyms. Dictionary with pronunciation, synonyms and translation suffers from a black eye after yelling gneiss! Heat ) buried deep in the rocks being intruded ( regional ) formed from or! Degree, are also the result of heat ) and translation and folding and faulting rocks... And translation metamorphism that occurs over large areas during periods of mountain ranges suffers a... Figure 1 ) higher grades of metamorphism can take place closer to surface than is case. New elements can take place closer to surface than is the case in other areas chemical and changes... Local intrusive heat source impact metamorphism the source of increased temperature and pressure is _____ ratings ) 1 rock... Heat flow and folding and faulting of rocks cause chemical and mineralogical in... Radioactive decay metamorphism requires that the affected rocks exist within a local intrusive heat source impact metamorphism source! Depth of burial due to increased rate of radioactive decay contact metamorphism requires the! ) formed from igneous or sedimentary rocks and the formation of regional metamorphism quizlet ranges it... Is, localized accelerated heat flow and folding and faulting of rocks source of increased temperature and pressure is....

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