What is lineation in metamorphic rock?

What is lineation in metamorphic rock?

If the minerals line up and point in a common direction, but with no planar fabric, this is lineation. When minerals lie on a plane AND point in a common direction; this is both foliation and lineation.

What are all the types of metamorphism that create lineation?

There are two main types of metamorphism:

• Contact metamorphism—occurs when magma contacts a rock, changing it by extreme heat (Figure 4.14).
• Regional metamorphism—occurs when great masses of rock change over a wide area due to pressure exerted on rocks at plate boundaries.

What causes lineation in metamorphic rocks?

A lineation is caused by a similar growth of elongate minerals (eg. hornblende) in this plane. Slate, schist, and gneiss are three common foliated metamorphic rocks.

Which of the following is a metamorphic rock?

Common metamorphic rocks include phyllite, schist, gneiss, quartzite and marble.

What is a lineation?

Definition of lineation 1a : the action of marking with lines : delineation. b : outline. 2 : an arrangement of lines.

What are the types of lineation?

There are several types of lineations, intersection lineations, crenulation lineations, mineral lineations and stretching lineations being the most common. Lineation field measurements are recorded as map lines with a plunge angle and azimuth.

What is lineation in structural geology?

Lineation is a general term to describe any repeated, commonly penetrative and parallel alignment. of linear elements within a rock (to envision lineation, imagine packages of spaghetti). A lineation. may be a primary igneous or sedimentary fabric element, such as an array of elongate K-feldspar.

What are the 3 main types of metamorphism?

The three types of metamorphism are Contact, Regional, and Dynamic metamorphism. Contact Metamorphism occurs when magma comes in contact with an already existing body of rock.

How is lineation formed?

Lineations are a series of parallel lines on a rock surface, formed by tectonic processes, by the transportation and deposition of sand under upper-flow-regime plane-bed conditions, or by the movement of glacial ice over the rock surface.

What are the 3 types of metamorphic rocks?

There are three ways that metamorphic rocks can form. The three types of metamorphism are Contact, Regional, and Dynamic metamorphism. Contact Metamorphism occurs when magma comes in contact with an already existing body of rock.

What are metamorphic rocks made of?

It is usually composed primarily of the minerals quartz, feldspar, and mica. When granite is subjected to intense heat and pressure, it changes into a metamorphic rock called gneiss. Slate is another common metamorphic rock that forms from shale.

What does lineation mean in poetry?

The technique of making lines of verse that involves also the rationale for breaking the lines, whether by closure (coming to the end of the phrase, clause, or sentence at the end of the line) or by enjambment (continuing the sentence beyond the line boundary, into the next line) (Kinzie, 1999).