Chapter 7: Metamorphic Rocks

Metamorphism brings changes in mineral arrangement and the texture of rocks, but it never leads to new mineral assemblages.

• True

• False

A buried body of shale is subjected to differential stress at temperatures greater than 200°C, causing clay minerals to grow in preferred orientation and producing slate. This is an example of.

• diagenesis

• erosion

• metamorphism

• weathering

Clay minerals within a buried body of shale are recrystallized at 400°C and high pressure to form mica, producing a rock called phyllite; this is an example of.

• diagenesis

• erosion

• metamorphism

• weathering

Metamorphism may be induced by.

• contact with a hot pluton

• contact with hot groundwater

• heat and pressure associated with deep burial

• fault sliding

• all of the above

Squashing a fly with a flyswatter is an example of.

• compression

• shear stress

Spreading peanut butter on bread is an application of.

• compression

• shear stress

Slaty cleavage is an example of.

• mineral cleavage

• foliated texture

• recrystallization

• sedimentary structures

Two common metamorphic rocks that typically lack of foliation are.

• slate and phyllite

• gneiss and Migmatite

• quartzite and marble

• schist and metaconglomerate

Compared to low-graded metamorphic rocks, high-grade rocks.

• always contain more quartz and feldspar

• are produced closer to the surface, high in the stratigraphic column

• are produced at greater temperatures and pressures

• are produced at cooler temperatures, but greater pressures

Rocks resulting from (contact) metamorphism will not possess.

• a new mineral assemblage distinct from that found prior to intrusion

• larger crystals than those characterizing the country rock prior to intrusion

• foliation

• silicate minerals