1 / 16

3.4 Metamorphic rocks form as existing rocks change

Learn about the process of metamorphism and how existing rocks change due to heat and pressure. Explore the different types of metamorphic rocks and the formation of bands and foliation. Discover the differences between contact and regional metamorphism.

mooresamuel
Télécharger la présentation

3.4 Metamorphic rocks form as existing rocks change

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 3.4 Metamorphic rocks form as existing rocks change

  2. Classifying Rocks • 3 rock types • Sedimentary • Igneous • Metamorphic

  3. Metamorphism • The process by which existing rock is changed by pressure or heat

  4. Metamorphic Rocks • “change” • Igneous and sedimentary rocks that have changed due to heat and pressure • Heat and pressure cause new combinations or new crystals to form • **heating and cooling of in mantle layer may lead to this formation

  5. Metamorphic

  6. Parent Rock • The original rock went through metamorphism. (the rock changed) • Ex: igneous rock and sedimentary rock “melting” together to form this new metamorphic rock) • A metamorphic rock CAN be a parent to another metamorphic rock • One rock, “melting” and turning into another

  7. Changes in Metamorphism • Rocks may flatten and pushed together • Rocks may “melt” together to form new rocks

  8. Recrystallization • The process by which bonds between atoms in minerals break and re-form in new ways during metamorphism

  9. Bands in Rocks • Foliation: the arrangement of minerals in flat or wavy parallel bands. • Found in rocks made of 2 or more minerals

  10. Foliated metamorphic rocksSlate Gneiss

  11. Nonfoliated Rock • Metamorphic rock without foliation (bands/stripes) • Primarily made of 1 mineral • Not subject to high pressure

  12. Non foliated metamorphic RocksMarble Quartzite

  13. Brain Pop http://www.brainpop.com/science/earthsystem/typesofrocks/preview.weml

  14. Discussion • What is metamorphism? • It is any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure, or the addition of chemical fluids. • Under what conditions do metamorphic rocks form? • Metamorphic rocks can form due to changes in temperature and pressure.

  15. Discussion • What type of metamorphic rock has layers? • Foliated metamorphic rock has layers (stripes).

  16. Challenge • Refer to book… • Compare and contrast contact metamorphism and regional metamorphism. • Contact metamorphism occurs where magma comes in contact with parent rock. Regional metamorphism occurs over a much larger area and results from increases in pressure and temperature and chemical fluids.

More Related