What is metamorphic phase rule?
Since metamorphism usually involves long periods of geologic time, most metamorphic rocks represent an equilibrium mineral assemblage. The Phase Rule for Metamorphism. Recall that the phase rule states that. F = C + 2 – P.
What is a phase diagram in geology?
A phase diagram is a graphical representation of chemical equilibrium. Since chemical equilibrium is dependent on the composition of the system, the pressure, and the temperature, a phase diagram should be able to tell us what phases are in equilibrium for any composition at any temperature and pressure of the system.
What are the mineral phases?
The term phase region is used when a mineral exhibits compositional variation, as in the solid-solution series between forsterite and fayalite. A phase may exist as a solid, liquid, or gas: H2O, for example, occurs in the form of ice (solid), water (liquid), and steam (gas).
How does metamorphic rock formed?
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 is the importance of ternary diagram?
A ternary diagram is a triangular coordinate system; the edges of the triangle are the axes. Ternary diagrams are used to plot three dependent variables that always add up to a fixed value, for example, to visualize the compositional variations of rocks or minerals.
What is metamorphism and its types?
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. When this happens the existing rocks temperature rises and also becomes infiltrated with fluid from the magma.
What process is used to form metamorphic rocks?
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.