Exam 7: Metamorphism and Metamorphic Rocks

Some of the oldest known rocks,which have been dated at about 4.0 billion years,are metamorphic.What does this tell us about the age of Earth?

If a rock is exposed to such high temperatures that it melts,it forms a(n)____________________ and becomes a(n)____________________ rock.

What are some examples of nonfoliated metamorphic rocks?

What is the significance of foliation in a metamorphic rock? (Not what is foliation,but what does it mean in terms of the rock's history?)

Metamorphic rocks can indicate the physical conditions that once existed in a geological setting.

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

How can fluid activity promote metamorphism?

The most important fluid promoting metamorphism is ____________________.

Describe how contact metamorphism occurs.What are the important factors that cause rocks to alter in this type of metamorphism?

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

The reaction of country rock with solutions from a cooling magma is known as:

What causes dynamic metamorphism and where is it found?

Contact metamorphism along sills and dikes may produce metamorphosed zones many kilometers wide.

The index minerals that form in a metamorphic rock depend on the composition of the parent rock affected.

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

The three types of metamorphism are ____________________,____________________,and ____________________.

Why is time important to metamorphic processes?

What is a metamorphic facies?

Metamorphism is most common along ____________________ plate boundaries.

Which three processes bring about metamorphism?