1 / 13

Sedimentary Rocks: Review

Sedimentary Rocks: Review. Metamorphic Rocks. Dr. David Steer. Rock Cycle. Metamorphic Rocks. Change in composition and/or texture of a rock Occurs as the result of increasing pressure and/or temperature. Regional Metamorphism.

aaronasmith
Download Presentation

Sedimentary Rocks: Review

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. Sedimentary Rocks: Review

  2. Metamorphic Rocks Dr. David Steer

  3. Rock Cycle

  4. Metamorphic Rocks • Change in composition and/or texture of a rock Occurs as the result of increasing pressure and/or temperature.

  5. Regional Metamorphism • Regional metamorphism occurs when rocks undergo increased temperatures and pressures • Associated with the formation of mountain belts. • Rocks may be buried to great depths (10-20 km) • Temperatures in excess of 700 oC and pressures of 7 kilobars (7 million atmospheres). • Increase in grain size • Platy minerals become aligned (foliated) • At high enough grades segregation of light and dark minerals occur (gneiss)

  6. Regional Metamorphism • Draw a schematic picture of the process

  7. Examples of Regional Metamorphic Rocks • Schist • Forms when mudrocks are heated • Gneiss • Forms when rocks ranging from mudrocks to granites are heated and pressurized

  8. Contact Metamorphism • Contact metamorphism occurs when rocks come in contact with a heat source (usually a magma body). • Essentially the rocks are getting baked, like in an oven. • Grain size increases as the result of increased temperature. • Grains are often randomly oriented

  9. Contact Metamorphism • Draw a schematic picture of the process

  10. Review • Two of these rocks are igneous, 2 are metamorphic and one is sedimentary. Which rocks most likely metamorphic? Temperature A B C Depth E D

  11. Examples of contact metamorphic Rocks • Marble • forms when limestone is heated • Quartzite • forms when sandstone is heated

  12. Create a Concept Map Key Words: regional metamorphism gneiss magma chambers contact metamorphism heat heat and pressure mountain belts grain size marble non-foliated rocks Linking phrases: surrounding can be formed by classified by caused by increasing that results in such as formed from an existing rock like associated with

  13. Identify your metamorphic rocks

More Related