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Warm Up 10/8

Warm Up 10/8. What type of sedimentary rock is formed from weathered particles of rocks and minerals? a. intrusive sedimentary rock b. chemical sedimentary rock c. clastic sedimentary rock d. biochemical sedimentary rock

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Warm Up 10/8

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  1. Warm Up 10/8 • What type of sedimentary rock is formed from weathered particles of rocks and minerals? a. intrusive sedimentary rock b. chemical sedimentary rock c. clastic sedimentary rock d. biochemical sedimentary rock • Which of the following is most likely to produce a fragmental(pieces)sedimentary rock? a. gravel deposited in a silt bed b. calcite crystallized from seawater c. magma fractures on the ocean floor d. limestone dissolved in cave formation • Relative cooling rates of igneous intrusive rocks can be estimated by comparing rocks’ a. density. c. chemical reactivity. b. crystal sizes. d. composition. Answers: 1) c. 2) a. 3) b.

  2. Metamorphic Rocks Chapter 3, Section 4

  3. Formation of Metamorphic Rocks • Most metamorphic changes occur at elevated temperatures and pressures. These conditions are found a few kilometers below Earth’s surface and extend into the upper mantle. • Contact Metamorphism – hot magma moves into rocks and changes the rock around it • Regional Metamorphism – occurs during mountain building as large areas of rock are subjected to temperature and pressure changes • Regional metamorphism results in large-scale deformation and high-grade metamorphism

  4. Formation of Metamorphic Rocks Contact Metamorphism Regional Metamorphism

  5. Concept Check • Compare and contrast contact and regional metamorphism. • Both processes change existing rocks into metamorphic rocks. Contact metamorphism is caused by magma and often produces slight changes in rocks. Regional metamorphism is large-scale deformation that can result in drastic changes to the rocks involved.

  6. Agents of Metamorphism • The agents of metamorphism are heat, pressure, temperature, and hydrothermal solutions • The most important agent of metamorphism is heat and comes from two sources, magma and change of temperature with depth • Minerals become unstable and recrystallize to form new minerals • With increased heat and pressure deep in the crust, rocks will flow instead of fracture • Hot fluids will dissolve old minerals and deposit new ones, changing the composition of the rock

  7. Agents of Metamorphism

  8. Stress as a Metamorphic Agent

  9. Classification of Metamorphic Rocks • The texture of metamorphic rocks can be foliated or nonfoliated • Foliated Metamorphic Rocks – The realignment of the minerals, at right angles to the direction of force, produces a banded appearance • Nonfoliated Metamorphic Rocks – metamorphic rocks that does not have a banded texture and contains only one mineral

  10. Classification of Metamorphic Rocks Foliated – Gneiss Nonfoliated – Marble

  11. Concept Check • Contrast foliated and nonfoliated metamorphic rocks. • Foliated metamorphic rocks have a layered or banded appearance. Nonfoliated metamorphic rocks do not have a banded texture.

  12. Assignment • Read Chapter 3, Section 4 (pg. 80-84) • Do Chapter 3 Assessment #1-36 (pg. 89-90) • #’s 9, 17, 18, 26, 27, 28, 34, & 35 • Study for Chapter 3 Quiz!

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