Regional metamorphism definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Expert Answer 100% (10 ratings) 1. In regional metamorphism the source of increased temperature and pressure is _____ . A Geologist suffers from a black eye after yelling "Gneiss!!!" a local intrusive heat source impact metamorphism the increase in temperature with increasing depth of burial due to increased rate of radioactive decay. Regional metamorphism is metamorphism that occurs over broad areas of the crust. 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). Contact metamorphism. Under these conditions, higher grades of metamorphism can take place closer to surface than is the case in other areas. 7.4 Regional Metamorphism As described above, regional metamorphism occurs when rocks are buried deep in the crust. Heat and fluids from the crystallizing magma cause chemical and mineralogical changes in the rocks being intruded. 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 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. 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. Increased temperature and/or pressure on a regional scale. Because burial to 10 km to 20 km is required, the areas affected tend to be large. Regional metamorphism occurs when rocks are buried deep in the crust. 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. This is metamorphism produced by intrusion of magma. 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. Look it up now! This is metamorphism associated with mountain building, that is, localized accelerated heat flow and folding and faulting of rocks. Most regional metamorphism takes place within continental crust. The grades are usually named for the dominant minerals or colors that identify them (Figure 1). Foliated rocks are the result of intense pressure (and sometimes, to a lesser degree, are also the result of heat). (b) Regional metamorphism. Since contact metamorphism requires that the affected rocks exist within a local temperature gradient, it is necessarily limited to small areas. Regional metamorphism is a localized event. This is commonly associated with convergent plate boundaries and the formation of mountain ranges. 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. 5. Gneiss is most common high grade metamorphic rock (regional) formed from igneous or sedimentary rocks. 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 (pressure-dominated) metamorphism occurs over large areas during periods of mountain building. Because burial to 10 km to 20 km is required, the areas affected tend to be large. This is commonly associated with convergent plate boundaries and the formation of mountain ranges. Regional metamorphism causes a layered or platy structure in rocks, called foliation. Metamorphic grades. Percolation hydrothermal fluids change chemical makeup of a rock by removing or depositing new elements. What are the three types of metamorphism? Hydrothermal Metamorphism. Regional Metamorphism. And translation source impact metamorphism the increase in temperature with increasing depth of burial due increased! Conditions, higher grades of metamorphism can take place closer to surface than is the in. 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