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Exam 8: Metamorphism and Metamorphic Rocks

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Question 21

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What may the intensity of regional metamorphism be recognized by?

A) index of recrystallization
B) index fossils
C) index minerals
D) index polymorphs
E) index cards

F) B) and C)
G) C) and D)

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Question 22

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Metamorphism takes place ____.

A) in the liquid state, melted by contact with magma
B) in the solid state with or without fluid activity
C) only at great depth
D) in the liquid state, melted by contact with magma, and only at great depth
E) all of these

F) C) and E)
G) A) and C)

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Question 23

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Kyanite,andalusite,and sillimanite ____.

What are some important types of ore deposits that may have resulted from movement of metallic ions in hydrothermal solutions?

One plate tectonic process that causes very widespread metamorphism is ____________________.

Granulites are low temperature but high pressure metamorphic facies.

What does increasing grade of metamorphism mean in terms of the conditions which produced a sequence of metamorphic rocks?

Only magmatic fluids,not pore fluids of the country rock,have an effect on contact metamorphism.

Some of the oldest known rocks,which have been dated at 3.96 billion years,are metamorphic.What does this tell us about the age of Earth?

List some of the minerals commonly used as index minerals for metamorphic zones.

How does lithostatic pressure differ from differential pressure?

The type of metamorphism that is common in fault zones in which rocks are subjected to high differential pressures is called ____________________.

Metamorphism is most common along ____________________ plate boundaries.

At which type(s)of tectonic plate boundaries does heat sufficient to cause metamorphism occur?

Isograds separate different metamorphic zones.

Why is time important in metamorphism?

Many ore deposits,including tin and tungsten,are associated with ____________________ metamorphism.

Contact metamorphism is found at the boundary between country rock and _______.

Metamorphic rocks can indicate the chemical changes that have occurred at various depths.

Metamorphism can be caused by increased temperatures.How can temperatures be raised,geologically,to bring about metamorphism?