Table of Contents
What factors affect metamorphic rock formation?
Factors Controlling Metamorphism
- Temperature and pressure. Temperature and pressure are important factors in determining the new minerals that form in a metamorphic rock.
- Water.
- Geostatic pressure.
- Differential stress.
- Figure 1.
- Differential Stress.
- Compressive stress.
- Figure 2.
What factors control the rate of change in the formation of metamorphic rocks?
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 two ways metamorphic rocks form?
Metamorphic rocks form when heat and pressure transform an existing rock into a new rock. Contact metamorphism occurs when hot magma transforms rock that it contacts. Regional metamorphism transforms large areas of existing rocks under the tremendous heat and pressure created by tectonic forces.
How does temperature increase 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.
How can a rock change during metamorphism?
Rocks change during metamorphism because the minerals need to be stable under the new temperature and pressure conditions. The need for stability may cause the structure of minerals to rearrange and form new minerals. Ions may move between minerals to create minerals of different chemical composition.
How are metamorphic rocks formed quizlet?
Metamorphic rocks are formed by intense heat, intense pressure, or by the action of watery hot fluids (metamorphism). Any of the rock types in the rock cycle can be metamorphosed, or changed into a metamorphic rock (metamorphic rock can be metamorphosed again).
How can a rock change during metamorphism quizlet?
How does the mineral composition of rock change during metamorphism? hot magma inside the earth heats up the rocks and causes them to produce new minerals. The closer to the magma the rock is the more it changes. Or the rocks change when pressure builds up due to shifts in the Earth’s crust.
What are the two ways metamorphic rocks form?
Lesson Summary
- Metamorphic rocks form when heat and pressure transform an existing rock into a new rock.
- Contact metamorphism occurs when hot magma transforms rock that it contacts.
- Regional metamorphism transforms large areas of existing rocks under the tremendous heat and pressure created by tectonic forces.
What happens to metamorphic rocks as pressure increases?
Grades of Metamorphism. As the pressure and temperature increase, rocks undergo metamorphism at higher metamorphic grade. Rocks changing from one type of metamorphic rock to another as they encounter higher grades of metamorphism are said to be undergoing prograde metamorphism.
What kind of minerals grow in a metamorphic rock?
This will be especially apparent for micas or other sheet silicates that grow during metamorphism, such as biotite, muscovite, chlorite, talc, or serpentine. If any of these flat minerals are growing under normal stress, they will grow with their sheets oriented perpendicular to the direction of maximum compression.
Which is the best description of metamorphic grade?
Metamorphic grade refers to the general temperature and pressure conditions that prevailed during metamorphism. As the pressure and temperature increase, rocks undergo metamorphism at higher metamorphic grade.
What causes changes in the protolith during metamorphism?
During metamorphism the protolith undergoes changes in texture of the rock and the mineral make up of the rock. mostly in the solid state and are caused by changes in physical or chemical conditions, which in turn can be caused by such things as burial, tectonic stress, heating by magma or interactions with fluids.