When there is directed pressure on a rock blank metamorphism may occur?
There are two main types of metamorphic rocks: those that are foliated because they have formed in an environment with either directed pressure or shear stress, and those that are not foliated because they have formed in an environment without directed pressure or relatively near the surface with very little pressure …
These forces are called stress. In response to stress, the rocks of the earth undergo strain, also known as deformation. Strain is any change in volume or shape. One type of stress is uniform, which means the force applies equally on all sides of a body of rock.
What is it called when you have equal amounts of pressure on all sides of a rock?
Finally, lithification is the process by which clay, sand, and other sediments on the bottom of the ocean or other bodies of water are slowly compacted into rocks from the weight of overlying sediments.
Metamorphic rocks
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.
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.
For metamorphism to occur energy is needed to fuel the chemical reactions. Heat is the primary source of this energy. The pressure within the earth is the result of gravity pulling the crust of the earth downward. Like heat, pressure increases with depth.
What causes pressure on the rocks?
the answer is dynamic.
