Clay minerals within a slate are changed into mica minerals as a result of the a
ID: 113602 • Letter: C
Question
Clay minerals within a slate are changed into mica minerals as a result of the application of heat to a rock. This is an example of
pressure solution.
plastic deformation
recrystallization
phase change
Which of the following is a common protolith involved in the formation of slate?
limestone
sandstone
shale
basalt
Marble and quartzite are nonfoliated rocks because
they are never found beneath fault zones or collisional mountain ranges.
both are dominated by minerals that produce equant grains.
both are dominated by minerals with crystalline structures that cannot be dissolved.
dynamothermal metamorphism can break down the structures of their constituent minerals, but neither of these minerals is stable in that metamorphic environment.
Change that takes place during metamorphism that is associated with hot water solutions (hydrothermal fluids) is termed
foliation
metasomatism
anachronism
hydrosomatism
The blueschist facies is a metamorphic realm of
high temperature and pressure.
low temperature and pressure.
high temperature but relatively low pressure.
high pressure but relatively low temperature.
Which of the following processes is NOT involved in metamorphism?
contact with a hot pluton
contact with hydrothermal fluids
heat and pressure associated with deep burial
cementation and compaction of grains during diagenesis
pressure solution.
plastic deformation
recrystallization
phase change
Explanation / Answer
1. recrystallization
Recrystallization causes changes in minerals size and shape. Chemical reactions occur between the minerals to form new sets of minerals that are more stable at the pressure and temperature of the environment, and new minerals form as a result of polymorphic phase transformations.
2. shale
3. both are dominated by minerals that produce equant grains.
4. metasomatism
If chemical alteration of the rock takes place as a result of fluids, the process is called metasomatism.
5. high pressure but relatively low temperature
Under the conditions of low temperature and high pressure, metamorphism produces an unusual blue mineral, glaucophane. Compressional stresses acting in the subduction zone create the differential stress necessary to form schists and thus the resulting metamorphic rocks are called blueschist.
6. contact with hot pluton
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