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EOSC 221: Types of Metamorphism

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Questions and Answers

What is the primary mechanism responsible for the formation of hydrothermal metamorphic rocks?

Annealing of rocks next to intrusions with aureoles

Interaction with hot fluids and changing bulk composition (correct)

High-temperature and high-pressure conditions during mountain building

Replacement of original minerals with hydrous minerals during weathering

What is the typical temperature range for the onset of metamorphism in rocks?

200-300°C

100-200°C

50-100°C

150-200°C (correct)

What is the characteristic feature of dynamic metamorphism?

Interaction with hot fluids and changing bulk composition

Stress dynamically deforming rocks in shear zones (correct)

High-temperature and high-pressure conditions

Replacement of original minerals with hydrous minerals

What is the primary difference between contact and regional metamorphism?

Cause of metamorphism (A) Signup and view all the answers

What is the term for the process of growth of new minerals in metamorphism?

Recrystallization (B) Signup and view all the answers

Which type of metamorphism is characterized by the formation of skarns and marble?

Contact metamorphism (B) Signup and view all the answers

What is the term for the line on a map showing the first appearance of an index mineral with equal metamorphic grade?

Isograd (C) Signup and view all the answers

Which type of metamorphism is characterized by the formation of high-P minerals such as lonsdaleite and stishovite?

Impact metamorphism (D) Signup and view all the answers

What is the name of the process that results in the growth of new mica minerals in pelites?

Recrystallization (B) Signup and view all the answers

What is the name of the foliated rock type that forms through the segregation of mafic and felsic minerals?

Gneiss (C) Signup and view all the answers