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Metamorphic Rocks

Metamorphic Rocks

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Metamorphic Rocks

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  1. Metamorphic Rocks 8th Grade Earth and Space Science Class Notes

  2. Friday, 12/21 Warm – Up • What aremetamorphic rocks? • Write down the HW. Learning Goal – Describe the formation of metamorphic rocks. Agenda • Warm-Up Question/Review HW • Take the Greek and Latin Roots Quiz #3 • Organize Binders • Check/correct the Section 6.3 Vocabulary and 6.3 Review Worksheet • Discuss the Sedimentary Rock Lab and Metamorphic Rock Lab • Work on Unit 5 Study Guide Homework – Unit 5 Study Guide due on Thursday, 1/3 Unit 5 Test and Binder Check on Friday, 1/4

  3. Metamorphic Rocks and Minerals • Sometimes rock are subject to pressure and heat but do not melt. • Instead the mineral composition, texture, or chemical composition of the rock changes • Metamorphic rock – rocks that changes form while remaining solid • Metamorphic mineral – minerals that form during metamorphism

  4. Metamorphic Rocks and Minerals Granite Gneiss forms from Granite Some example metamorphic minerals. These minerals are stable at different conditions than other minerals!

  5. Metamorphic Textures • Foliated – layers and bands of minerals • Forms when pressure is applied in opposite directions

  6. Metamorphic Textures • Nonfoliated – blocky, crystal shapes • Forms when pressure is not applied in opposite directions Example – marble from limestone

  7. Porphyroblasts • Mineral growth that results from the rearrangement of atoms during metamorphism Garnet growing in quartzite

  8. Grades of Metamorphism • Low grade  low temperature and pressure • Intermediate grade  in-between • High grade  high temperature and pressure

  9. Types of Metamorphism • Regional – caused by high temperature and pressure in large regions of the Earth’s crust • Can range from high to low grade • Changes in mineral and rock types • Folding and deforming of rock layers

  10. Types of Metamorphism • Contact – when molten material comes in contact with solid rock • High temperatures • High to low pressure • Metamorphic effects decrease with distance

  11. Types of Metamorphism • Hydrothermal – when very hot water interacts with rock • Original texture and mineral composition can change • Ore deposits of gold, copper, zinc, tungsten, and lead form this way

  12. Economic Importance • Metallic resources – gold, silver, copper and other metallic minerals form through hydrothermal metal deposits • Nonmetallic resources – Talc, asbestos, and graphite form through metamorphism

  13. The Rock Cycle • Rocks are continually changing above and below the Earth’s surface. • This continuous changing is called The Rock Cycle.