What 2 factors commonly cause metamorphism?

What 2 factors commonly cause metamorphism?

Metamorphism occurs because some minerals are stable only under certain conditions of pressure and temperature. When pressure and temperature change, chemical reactions occur to cause the minerals in the rock to change to an assemblage that is stable at the new pressure and temperature conditions.

Which are the factors needed for metamorphism to occur?

The main factors that control metamorphic processes are: The mineral composition of the parent rock. The temperature at which metamorphism takes place. The amount and type (direction) of pressure during metamorphism. The amount and type of fluid (mostly water) that is present during metamorphism.

What are the two 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 two conditions are necessary to create a foliated metamorphic rock?

Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.

What are 2 metamorphic minerals formed along oceanic ridges?

Subduction, or the descent of oceanic crust along downward-dipping zones, normally leads to the formation of high-pressure facies mineral assemblages that include glaucophane, lawsonite, jadeite, and pyrope garnet. These usually occur in the outer or oceanward metamorphic belts of modern island arcs, e.g., Japan.

What is the main factor that affects regional metamorphism water?

The temperature that the rock is subjected to is a key variable in controlling the type of metamorphism that takes place. As we learned in the context of igneous rocks, mineral stability is a function of temperature, pressure, and the presence of fluids (especially water).