Chapter 4 Section 3 METAMORPHIC ROCKS

You will learn: Describe the conditions in Earth that cause metamorphic rocks to form Classify metamorphic rocks as foliated or nonfoliated

Vocabulary metamorphic rock foliated nonfoliated

It is important because... metamorphic rocks are useful because of their unique properties.

I. Formation of Metamorphic Rocks

a. Metamorphic Rocks Can form from igneous, sedimentary, or other metamorphic rocks The form of the rock and/or the composition of the rock can change

Heat and Pressure Adding heat and pressure can change a rock from it’s parent rock to a new rock. For example: shale to slate to phyllite to schist to gneiss Basalt to schist Granite to gneiss

Slate to Phyllite to Schist to Gneiss

Hot Fluids Water with dissolved elements reacts with minerals in rocks and change the compositions. Mostly water and carbon dioxide

II. Classifying Metamorphic Rocks

a. Foliated Foliated rocks form when mineral grains flatten and line up in parallel lines Example: slate and gneiss

Nonfoliated No layering occurs and mineral grains do not line up Example: marble, quartzite

Ticket Out the Door How are metamorphic rocks formed? What is a “parent rock”? How are metamorphic rocks classified? What role do fluids play in rock metamorphism? Why is marble used for sculptures?