What is a metamorphic rock? How is it formed?

Metamorphic RockChapter 6, Section 3

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How to make a metamorphic rock

Take any kind of rock Cook at ______ to ~______°C

Above ~650°C rocks start to melt Bury to 2-45 km (pressure of 1-15 kb)

Apply water — Remember!?! Water ________ the melting point of rocks

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Factors Controlling Metamorphism

Primary:

_______________

_______________

Secondary:

Presence of __________________ fluidshttp://earthref.org/SCC Scripps Classroom

Connection

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Pressure

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____________ Pressure: same pressure from all directions.

____________ Pressure: unequal pressure from different directions

Directed Pressure

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●__________: minerals are arranged in layers or bands

●__________: not layered; minerals grow in the same size and shape

Metamorphic Rock Textures

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Animation

Foliation becomes more distinct with increased temperature and pressure

Crystals grow ______________ Foliation becomes more _______________

Order schist, slate, and gneiss with increasing foliation and explain why.

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Effects of Hydrothermal Fluids

Heating rock underground can produce _________ and _______.

Fluids ___________ and ___________ ions throughout large regions of rock

Rocks change ___________________ into different mineralogy and texture.

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Three Types of Metamorphism

Contact

Regional

Hydrothermal

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Relation of Metamorphic Rocks to Plate Tectonics

●Metamorphism involves a change in rock

●Metamorphism occurs under three conditions

●Metamorphic rocks are classified into two main groups

●There are two overall categories of metamorphism according to how they are formed, and the area of rock affected

Overview

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