Does Lithostatic pressure cause foliation?

Burial metamorphism occurs to rocks buried beneath sediments to depths that exceed the conditions in which sedimentary rocks form. Because rocks undergoing burial metamorphism encounter the uniform stress of lithostatic pressure, not differential pressure, they do not develop foliation.

How is pressure related to foliation?

Cause of Foliation All rocks are under pressure as a result of burial. The alignment of grains results in a layered texture. This means that differential stress related to different pressure in different directions is required to form foliated metamorphic rocks.

How do you determine foliation?

Foliated texture is further subdivided based on the presence or absence of pronounced color banding in the rock. Rocks without distinct alternating bands of light and dark minerals are described a nonlayered, whereas rocks with alternating bands of dark and light minerals are described as layered.

Which type of pressure produces foliation in metamorphic rocks?

directed pressure
When a rock is squeezed under directed pressure during metamorphism it is likely to be deformed, and this can result in a textural change such that the minerals are elongated in the direction perpendicular to the main stress (Figure 7.5). This contributes to the formation of foliation.

What is secondary foliation?

A foliation that develops during deformation and/or metamorphism; includes slaty cleavage, crenulation cleavage, solution cleavage, schistosity, and gneissic banding.

Does this metamorphic rock have foliation?

Slate is a fine-grained metamorphic rock that exhibits a foliation called slaty cleavage that is the flat orientation of the small platy crystals of mica and chlorite forming perpendicular to the direction of stress.

What is foliation and what causes it quizlet?

Foliation is the arrangement of a set of minerals in parallel, sheet-like layers that lie perpendicular to the flattened plane of a rock. This occurs when directed pressure is exerted. The four factors are temperature, lithostatic pressure, the amount of composition of fluids, and the composition of the parent rock.