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Contact metamorphism takes place where a body of magma intrudes into the upper part of the crust. Any type of magma body can lead to contact metamorphism, from a thin dyke to a large stock.
May 22, 2019 · Contact metamorphism is a type of metamorphism that occurs adjacent to intrusive igneous rocks due to temperature increases resulting from hot magma intrusion into the rock. The metamorphosed zone is known as the metamorphic aureole around an igneous rock.
Contact metamorphic rocks form when rocks are heated to high temperatures, usually through contact with an igneous intrusion at a relatively low pressure. The effects of contact metamorphism usually only extend for a short distance from the cooling igneous rock that is providing the heat.
Contact metamorphism occurs due to heating, with or without burial, of rocks that lie close to a magma intrusion. It is characterized by low P / T gradients, as strong thermal gradients between an intruding magma and adjacent country rock are best established at shallow crustal levels.
As seen in Figure 8.6, contact metamorphism leads to the development of metamorphic zones called contact aureoles, or skarns, that wrap around an intrusion. Aureoles may be anywhere from a few centimeters to many kilometers thick.
Contact Metamorphism. Contact metamorphism happens when a body of magma intrudes into the upper part of the crust. Heat is important in contact metamorphism, but pressure is not a key factor, so contact metamorphism produces non-foliated metamorphic rocks such as hornfels, marble, and quartzite.
In the classic case, an igneous intrusive body such as a granite intrudes a sequence of sedimentary or metamorphic rocks and produces a contact aureole consisting of several temperature-specific mineral assemblages. Contact metamorphism is thus primarily a thermal phenomenon.
In metamorphic rock: Contact metamorphism. Whenever silicate melts (magmas, from which igneous rocks crystallize within Earth) invade the crust at any level, they perturb the normal thermal regime and cause a heat increase in the vicinity. If a mass of basaltic liquid ascending from the upper. Read More.
Contact Metamorphism. Contact metamorphism happens when a body of magma intrudes into the upper part of the crust. Heat is important in contact metamorphism, but pressure is not a key factor, so contact metamorphism produces non-foliated metamorphic rocks such as hornfels, marble, and quartzite.
Contact (thermal) metamorphism is the phenomenon of recrystallization and re-equilibration seen in the country rocks adjacent to intrusive igneous bodies. Contact metamorphic effects can be associated with intrusive rocks of any composition, and in any emplacement mode (e.g., adjacent to dykes, sills, or major batholiths).
