Where does burial metamorphism occur?

Where does burial metamorphism occur?

Burial metamorphism commonly occurs in sedimentary basins, where rocks are buried deeply by overlying sediments. As an extension of diagenesis, a process that occurs during lithification (Chapter 5), burial metamorphism can cause clay minerals, such as smectite, in shales to change to another clay mineral illite.

What is Granitization in geology?

Granitization, formation of granite or closely related rocks by metamorphic processes, as opposed to igneous processes in which such rocks form from a melt, or magma, of granitic composition. In granitization, sediments are transformed in their solid state or in a partially molten state.

Where does Metasomatism occur?

Metasomatism takes place in some rocks adjacent to igneous intrusions (see Contact (thermal) metamorphism; Skarn). It may also affect extensive areas (regional metasomatism), with the introduction of fluids possibly related to partial fusion at depth.

What are the 2 types of metamorphism?

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 is the process of Granitization?

Granitization is a metasomatic process by which previous rocks are converted inte granite (or granite-looking rocks) without departing from the predominantly solid state (Mehnert 19866). In the Vastervik area, granitization processes have been described repeatedly (summarized by Gavelin 1984).

What causes Metasomatism?

In the metamorphic environment, metasomatism is created by mass transfer from a volume of metamorphic rock at higher stress and temperature into a zone with lower stress and temperature, with metamorphic hydrothermal solutions acting as a solvent.

What causes metasomatism?

What is metamorphism process?

Metamorphism is a process that changes preexisting rocks into new forms because of increases in temperature, pressure, and chemically active fluids. Metamorphism may affect igneous, sedimentary, or other metamorphic rocks.

What are the 7 types of metamorphism?

Types

• Regional.
• Contact (thermal)
• Hydrothermal.
• Shock.
• Dynamic.
• Metamorphic facies.
• Metamorphic grades.
• Recrystallization.

What kind of process does granitization take place?

Granitization, formation of granite or closely related rocks by metamorphic processes, as opposed to igneous processes in which such rocks form from a melt, or magma, of granitic composition.

How does a metamorphic rock become a granite?

An old, and largely discounted process, granitization states that granite is formed in place through extreme metasomatism by fluids bringing in elements, e.g. potassium, and removing others, e.g. calcium, to transform a metamorphic rock into a granite. This was supposed to occur across a migrating front.

How does the chemical weathering of granite occur?

Chemical weathering of granite occurs when dilute carbonic acid, and other acids present in rain and soil waters, alter feldspar in a process called hydrolysis.

What kind of rock is a migmatite made of?

Migmatite, in geology, rock composed of a metamorphic (altered) host material that is streaked or veined with granite rock; the name means “mixed rock.” Such rocks are usually gneissic (banded) and felsic rather than mafic in composition; they may occur on a regional scale in areas of high-grade metamorphism.…