Warm Up What type of sedimentary rock is

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Warm Up What type of sedimentary rock is formed from weathered particles of rocks

Warm Up 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 2) 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 3) 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. 1)

Metamorphic Rocks Chapter 3, Section 4

Metamorphic Rocks Chapter 3, Section 4

Formation of Metamorphic Rocks n n Most metamorphic changes occur at elevated temperatures and

Formation of Metamorphic Rocks n n 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

Formation of Metamorphic Rocks Contact Metamorphism Regional Metamorphism

Formation of Metamorphic Rocks Contact Metamorphism Regional Metamorphism

Concept Check Compare and contrast contact and regional metamorphism. n Both processes change existing

Concept Check Compare and contrast contact and regional metamorphism. n 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. n

Agents of Metamorphism n n n The agents of metamorphism are heat, pressure, temperature,

Agents of Metamorphism n n n 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

Agents of Metamorphism

Agents of Metamorphism

Stress as a Metamorphic Agent

Stress as a Metamorphic Agent

Classification of Metamorphic Rocks The texture of metamorphic rocks can be foliated or nonfoliated

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

Classification of Metamorphic Rocks Foliated – Gneiss Nonfoliated – Marble

Classification of Metamorphic Rocks Foliated – Gneiss Nonfoliated – Marble

Concept Check Contrast foliated and nonfoliated metamorphic rocks. n Foliated metamorphic rocks have a

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

Assignment Read Chapter 3, Section 4 (pg. 80 -84) n Do Chapter 3 Assessment

Assignment Read Chapter 3, Section 4 (pg. 80 -84) n Do Chapter 3 Assessment #1 -36 (pg. 89 -90) n For Section 4, Do #’s 9, 10, 17, 18, 26 -28 n Study for Chapter 3 Quiz! n