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Metamorphic rocks - Types of Metamorphic Rocks: What are Metamorphic Rocks


Metamorphic Rocks


For example, recrystallization increases grain size much like adjacent soap bubbles coalesce to form larger ones.



Dynamic Metamorphism: When the changes are caused due to high pressure, it is called Dynamic Metamorphism.







Many complex high-temperature reactions may take place between minerals without them melting, and each mineral assemblage produced provides us with a clue as to the temperatures and pressures at the time of metamorphism.



Around the igneous rock that forms from the cooling magma is a metamorphosed zone called a.











This causes crystals of platy minerals, such as and , to become rotated such that their short axes are parallel to the direction of shortening.


Description: Metamorphic source rocks, the rocks that experience the metamorphism, are called the parent rock or protolith, from proto— meaning first, and lithos- meaning rock.

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This combination of high temperature and low pressure produces numerous metamorphic facies.
Foliation Main article: Many kinds of metamorphic rocks show a distinctive layering called derived from the word folia, meaning "leaves".
Foliation Main article: Many kinds of metamorphic rocks show a distinctive layering called derived from the word folia, meaning "leaves".

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    +145reps
    Common metamorphic rocks include phyllite, schist, gneiss, quartzite and marble. Foliated Metamorphic Rocks: Some kinds of metamorphic rocks -- granite gneiss and biotite schist are two examples -- are strongly banded or foliated. (Foliated means the parallel arrangement of certain mineral grains that gives the rock a striped appearance.)
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    +50reps
    Common metamorphic rocks varieties include phyllite, schist, gneiss, quartzite, and marble. Metamorphic rocks can be classified into two main categories based on the way they are formed - those that are foliated as they have been formed due to high pressure and under shear stress and those that are not foliated under any form of pressure.
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    +291reps
    Metamorphic rocks are formed when rock changes over a period of time due to a lot of physical changes like pressure, heat and different chemical activity. When sedimentary rocks or igneous rocks go through the physical process such as pressure exposure, heat changes, and tectonic plate movement at plate edges.
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    +399reps
    Metamorphic rocks, meta- meaning change and – morphos meaning form, is one of the three rock categories in the rock cycle (see Chapter 1 ). Metamorphic rock material has been changed by temperature, pressure, and/or fluids. The rock cycle shows that both igneous and sedimentary rocks can become metamorphic rocks.
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    +81reps
    metamorphic rock, any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. The word metamorphism is taken from the Greek.
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