Concept #2 Quiz

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Concept #2 Quiz
Choose the best possible answer to the following questions about Key Concept 2 "Metamorphic textures."

This activity contains 9 questions.

Identify the types of stress and the indicated features by selecting the correct response. (Stress figure, Copyright © by Prentice Hall, Inc.)

The letters A through C appear on an image associated with this question.

The letters A through C appear on an image associated with this question.

For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
1.1 confining pressure	[hint]

1.2 slaty cleavage	[hint]

1.3 differential stress	[hint]

Which are the three mechanisms by which minerals develop a “preferred orientation”?

hydrochemical, hydrothermal, regionalrotation, recrystallization, change in grain shape recrystallization, differential stress, rotation rotation, trilobite, change in grain shape

How might one distinguish between a phyllite and schist texture?

The schist is composed of micas, whereas the phyllite is composed of clay and quartz.The schist is relatively more shiny due to the relatively large size of its grains. The schist usually has smaller grains than does the phyllite. The schist has mineral bands, whereas the phyllite has schistosity defined by micas.

Which of the following is the best explanation of the process that produced the texture of the metaconglomerate shown in the figure?

deposition in a river system – burial and diagenesis – burial and impact metamorphism flattened and elongated the clasts deposition in a river system – burial and diagenesis – thermal metamorphism flattened and elongated the clasts deposition in a river system – burial and lithification – hydrothermal metamorphism flattened and elongated the clastsdeposition in a river system – burial and lithification – imposed differential stress flattened and elongated the clasts

Match the texture with the appropriate description:

Using the pull-down menus, match each item in the left column to the corresponding item in the right column.


	closely-spaced planar surfaces along which rocks split into thin, tabular slabs when hit with a hammer

	a small number of very large crystals surrounded by the finer-grained rock

	shiny, planar alignment of mica to form a foliation

	a banded foliation resulting from a segregation of minerals

	a large number of smaller grains that surround a small number of very large crystals

	rocks that do not exhibit a foliated texture of any kind

5.1 matrix

5.2 porphyroblasts

5.3 nonfoliated

5.4 gneissic

5.5 schistosity

5.6 slaty cleavage

Which explains the difference between a schistosity and a gneissic texture? Check all that apply.

A schistosity is defined by the parallel alignment of micas in a close spacing, giving the surfaces a sheen, whereas a gneissic texture is defined by the parallel alignment of micas in a coarse spacing, giving the surfaces a sheen only if broken on the mica surfaces.In a gneissic texture the micas are usually spaced too far apart to give much of a shine, whereas a schistosity is very shiny in appropriate light because the mica crystals that define it are abundant and all parallel to a single planar orientation. A schistosity is very shiny in appropriate light because the mica crystals that define it are abundant and all parallel to a single planar orientation, whereas in a gneissic texture the micas are usually spaced too far apart to give as much of a shine.A schistosity is defined by the parallel alignment of in a coarse spacing, giving the surfaces a sheen only if broken on the mica surfaces, whereas a gneissic texture is defined by the parallel alignment of micas in a close spacing, giving the surfaces a sheen.

What platy minerals form parallel mineral patterns, a schistosity, in typical schist?

micas carbonates feldspar quartz

What major change occurs during metamorphism of limestone to marble?

clay crystallizes to mica, forming a highly foliated, mica-rich rock calcite grains are dissolved away leaving only marble crystals limestone grains react to form quartz and feldsparscalcite grains recrystallize and grow large

Which is the rock that forms the best rock cleavage and why?

quartzite – the grains are equidimensional, so they have no discernable foliation for breaking.gneiss – the grains have a preferred orientation and split easily along the mineral bands.slate – the grains are so small and so well intergrown that the rock is very strong and breaks along planes of fine micas.schist – the grains are too coarse and intergrown with porphyroblasts.

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