Metamrophic Rocks

METAMORPHIC ROCKS (Chapter 6) - Lecture Outline

Last updated: 02/16/07

1. The concept of metamorphism

Definition

2. Development of modern ideas of metamorphism

	The problem with studying metamorphism
	Concepts

metamorphic grade

peak metamorphism

index minerals

isograds

metamorphic zones

3. Factors controlling the nature of metamorphism

Composition of protolith (starting material)

Temperature and Pressure

geothermal gradient

PT limits

metamorphic grade

mineral assemblage response

textural response

	schistosity
	gneissosity

Fluids

devolatilization

Time

4. Kinds of metamorphism

Cataclastic-mylonitic metamorphism

Fault zones

Impact metamorphism

Seafloor metamorphism

High P - low T metamorphism

Contact metamorphism

Regional metamorphism

5. Terminology of metamorphic rocks

Metamorphic rock nomenclature

Criteria for naming metamorphic rocks

protolith

metamorphic mineralogy

rock texture

additional textural terms

Example of metamorphism of a shale

Example of metamorphism of a basalt

Metamorphic facies

6. Metamorphism and plate tectonics

PTt paths