Ch 3 4 metamorphic rocks

What type of sedimentary rock is formed from weathered particles of rocks and minerals?. Formation of Metamorphic Rocks  Most metamorphic changes occur at elevated temperatures and pres

Warm Up 10/8

1. What type of sedimentary rock is formed from weathered particles

of rocks and minerals?

a intrusive sedimentary rock c clastic sedimentary rock

b chemical sedimentary rock d biochemical sedimentary rock

2. What type of rocks are formed by processes powered by the sun?

a No rocks are formed by energy from the sun

b sedimentary rocks

c igneous rocks

d metamorphic rocks

3. What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate

minerals?

a ultramafic c basaltic

Metamorphic

Rocks

Chapter 3, Section 4

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

Formation of Metamorphic

Rocks

Contact Metamorphism

Regional Metamorphism

Concept Check

regional metamorphism.

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.

Agents of Metamorphism

pressure, temperature, and hydrothermal

solutions

heat and comes from two sources, magma and change of temperature with depth

form new minerals

crust, rocks will flow instead of fracture

deposit new ones, changing the composition

of the rock

Agents of Metamorphism

Stress as

a Metamorp

hic Agent

Classification of Metamorphic Rocks

 The texture of metamorphic rocks

can be foliated or nonfoliated

The realignment of the minerals, at right angles to the direction of force, produces a banded appearance

– metamorphic rocks that does not

Classification of Metamorphic Rocks

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.

 Read Chapter 3, Section 4 (pg

80-84)

 Do Section 3.4 Assessment #1-8 (pg 84)

 Study for Chapter 3 Quiz!