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Metamorphic Rocks. Rock Cycle Objectives 14 – Describe the types of changes associated with metamorphic rocks. 15 – Contrast regional and contact metamorphism.

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Presentation on theme: "Metamorphic Rocks. Rock Cycle Objectives 14 – Describe the types of changes associated with metamorphic rocks. 15 – Contrast regional and contact metamorphism."— Presentation transcript:

1 Metamorphic Rocks

2 Rock Cycle

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4 Objectives 14 – Describe the types of changes associated with metamorphic rocks. 15 – Contrast regional and contact metamorphism.

5 Metamorphic Rocks Pre-existing rocks changed by heat and pressure

6 Different Types of Changes Compaction Grains move closer. Rock becomes more dense. Porosity reduced. Example: clay to shale to slate Recrystallization- Growth of new crystals. No changes in overall chemistry. New crystals grow from the minerals already present Foliation Minerals separate into bands New minerals form from heat and pressure

7 Types of Metamorphism: Contact Contact (thermal) Small scale Associated with igneous intrusions

8 Types: Regional Metamorphism Regional (dynamic) Large scale Associated with mountain building

9 Foliated vs. Non-foliated Foliated – has bands or layers Non-foliated - No banding Form from rocks made up of single minerals

10 Rank The degree of metamorphism required to change a rock

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12 Quartzite Non-foliated Visible minerals grains Low-high metamorphisis Quartz Parent - Sandstone

13 Marble Non-foliated Usually visible grains – granular Will effervesce in HCl Calcite Parent - Limestone

14 Anthracite Non-foliated Black color Metamorphosed Coal PeatLignite Bituminous coal Anthracite

15 Slate Foliated Small grain size Low metamorphism Visible layering A metamorphosed shale

16 Phylite Foliated Small-visible grains Low-medium metamorphism Sheen Crenulations- slight wavy appearance A metamorphosed slate

17 Schist Foliatied Visible grain size Medium metamorphism Biotite, Garnet A metamorphosed phylite Basalt may change into schist

18 Gneiss Foliated Large visible grains High degree of metamorphism Definite banding and recrystallization Horneblende, Quartz Metamorphosed schist

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