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Chapter 8: Metamorphism: A Process of Change
Animations
Click on the links below to view animations created specifically for Earth: Portrait of a Planet. Animations require Macromedia's Flash Plug-in.
ANIMATION: Foliation in Metamorphic Rock (Preferred Orientation)
This animation shows how squeezing or shearing a rock under metamorphic conditions can result in preferred mineral orientation. Inequant grains distributed through a soft matrix rotate into parallelism as the rock changes shape. For more information, see "Foliated Metamorphic Rocks" starting on p. 235 and Figure 8.6 in your textbook.
WHAT A GEOLOGIST SEES: Compositional Banding in Gneiss
A glaciated surface exposing gneiss contains alternating bands of light-colored and dark-colored minerals. A geologist's interpretation of the outcrop emphasizes the banding. For more information, see "Gneiss" starting on p. 236 in your textbook.
Zoomable Art: Environments of Metamorphism
Metamorphic rocks form when a preexisting rock (a protolith) undergoes changes in texture and/or mineral content in the solid state, in response to changes in temperature, pressure, or differential stress, or in response to interactions with hydrothermal fluids. For more information, see the Section 8.7 Where Do You Find Metamorphic Rocks? starting on p. 249 and the Featured Painting on pp. 250-51 in your textbook.