Metamorphic Rocks
Metamorphic rock is the result of an existing rock type called the protolith that transforms using a process called metamorphism, which means "change in form". The protolith, when subjected to heat and pressure causes profound physical and/or chemical change. The protolith may be asedimentary rock, igneous rock or some other type of older metamorphic rock. They also make up a large part of the Earth's crust. They are classified by textures, chemicals and minerals assembled. They are formed in various ways; molten rock called magma, simply being deep beneath the earth under great pressure, and others. To learn more about them, go to this link: http://geology.about.com/cs/basics_roxmin/a/aa011804c.htm
Posted by Answerman on 8/25/2009
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Metamorphic rock - Wikipedia, the free encyclopedia
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Atlas of Igneous and Metamorphic Rocks; A nice gallery of metamorphic rocks in thin section. A good way to get a closer look at the common igneous rocks ... In order to classify metamorphic rocks, it is also necessary to take of the subjects of texture and classification schemes. If you have completed the igneous rock...
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When preexisting rocks are exposed to conditions of high temperature and/or pressure they undergo solid-state changes (they "metamorphose") to become metamorphic rocks. The rock doesn't melt, but it changes state by one or both of these processes:
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Metamorphic rocks have been changed, usually by heat and pressure, from their original condition into rock with new minerals and/or structures. Texture, structure, and mineral content of metamorphic rock depend both on its protolith (parent material) and metamorphic conditions.
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Some Common Metamorphic Rocks ... Metamorphic rocks form deep in the earth where high temperature, great pressure, and chemical reactions cause one type of rock to change into another type of rock. Metamorphic rocks begin to form at 12-16 kilometers beneath the earth's surface.
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Metamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks. How do sedimentary and igneous rocks change? The rocks are under tons and tons of pressure, which fosters heat build up, and this causes them to change.
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Metamorphic grade is a general term for describing the relative temperature and pressure conditions under which metamorphic rocks form. ... Examples of hydrous minerals that occur in low grade metamorphic rocks:
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The two keys below are comprehensive, covering all the major metamorphic rocks. They are split into two keys, one for granular and one for foliated rocks. Since not all specimens are clear cut, sometimes the same rock shows up on both keys, to cover all contingencies.
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; The chart to the right arranges metamorphic rocks according to their classifiction. If you go to the Kinds of Metamorphism page you will find the processes by which each group forms.
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Metamorphic Rocks
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