Exam 7: Metamorphism and Metamorphic Rocks

Metamorphic rocks are very common in the crystalline basement rocks of the oldest parts of continents.

Aureoles surrounding felsic bodies will contain higher-temperature metamorphic minerals than mafic magmas.

Metamorphic rocks may form from:

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?

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

Metamorphic rocks indicate that an even older parent rock once existed in that place.

What is the parent rock for the following metamorphic rocks: marble: ____________________; anthracite: ____________________; quartzite: ____________________; slate: ____________________; schist: ____________________; and greenstone: ____________________.

What is the difference between slate and phyllite?

What is a metamorphic facies?

How are metamorphic rocks classified? What are the two main classifications, and how are they different from each other?

The type of metamorphism that occurs over large areas, commonly at convergent plate margins, and is responsible for the production of most metamorphic rocks is ____________________.

What are metamorphic zones based on? How are rocks within the same metamorphic zone similar to each other?

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

Metamorphism at an oceanic-continental convergent plate boundary where temperatures are low and pressures are high results in rocks typical of the ____________________ facies.

What is the role of heat as an agent of metamorphism? What are the heat sources available for the formation of metamorphic rocks?

A rock with segregated light and dark bands, containing the minerals quartz, feldspar, hornblende, and mica, is a(n) ____________________ gneiss.

What is metamorphic grade? Present an example of how a rock reaches its metamorphic grade.

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

What causes dynamic metamorphism and where is it found?

Foliated metamorphic rocks are further classified on the basis of what observable properties?