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Metamorphic Rock

Metamorphic Rock. The changes or alterations of rock in terms of texture or mineralogy from the pre-existing rock is caused by: Temperature Pressure Chemical environment changes. Metamorphism. Another factor that affects the metamorphism is the original or parent rock.

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Metamorphic Rock

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  1. Metamorphic Rock

  2. The changes or alterations of rock in terms of texture or mineralogy from the pre-existing rock is caused by: • Temperature • Pressure • Chemical environment changes Metamorphism

  3. Another factor that affects the metamorphism is the original or parent rock.

  4. There are numerous combinations of metamorphic rocks. • The first characteristic is to look at the texture of the rock: • Foliated • Non-foliated Classification of Metamorphic Rock

  5. The alignment of minerals in a rock subjected to increased pressure is called foliation.. • This involves rocks with two or more crystals. Foliation

  6. Pressure will cause the material to compact. The type of pressure will dictate the alignment of the minerals; foliation. Pressure Effects

  7. The type of minerals will determine the type of new rock formed. • If only one mineral is found in the parent rock, when it undergoes metamorphism the composition remains the same but the crystals grow larger. • More that one mineral present, re-crystallization can take place making for new minerals. Mineralogy

  8. The two main types are: • Contact metamorphism, and • Regional metamorphism. Types of Metamorphism

  9. These rocks are formed during metamorphism usually without significant differential stress but with high temperature. • Contact metamorphism occurs in country rock (rock surrounding the magma) immediately adjacent to intruded magmas. Contact Metamorphism

  10. This is the most common source of metamorphic rock of the Earth’s crust. • It involves occurring at great depths. • Pressure, temperature and the chemical environment of the original rock are all altered. Regional Metamorphism

  11. This is the term given to the intensity of metamorphism that a mineral has been subjected. • Lots of heat, pressure and chemical change it would be considered a high metamorphic grade. Metamorphic Grade

  12. Shock Metamorphism

  13. The impact of meteors can create a metamorphism called Shock metamorphism. • As the meteor strikes the earth it creates enough heat and melts local rock which are thrown up to 100km from the impact site. These rocks are called Tektites.

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