What do we mean when we say a phase is perfectly mobile?
A perfectly mobile component is one that is in equilibrium with a given mineral assemblage and also in equilibrium with an external reservoir.
What does eclogite look like?
Eclogite is a very beautiful rock. It is sometimes referred to as a christmas rock because of bright green, red and white minerals. Green is pyroxene omphacite, red is garnet, white is quartz. Nordfjord, Western Norway.
What are the 3 main types of metamorphism?
There are three ways that metamorphic rocks can form. 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.
How do temperature and pressure affect the metamorphic rock formation?
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.
What is a mineralogical phase rule?
Originally proposed by Goldschmidt (1911), the Mineralogic Phase Rule is a special boundary condition of the Gibbs Phase Rule, F=C+ 2–P (see Vol. IVA, Phase Equilibria), which states that temperature and pressure are externally controlled and probably variable across the stability range of a particular assemblage.
What is the importance of eclogite?
Eclogites are helpful in elucidating patterns and processes of plate tectonics because many represent oceanic crust that has been subducted to depths in excess of 35 km and then returned to the surface.
What is eclogite parent rock?
eclogite, any member of a small group of igneous and metamorphic rocks whose composition is similar to that of basalt. Eclogites consist primarily of green pyroxene (omphacite) and red garnet (pyrope), with small amounts of various other stable minerals—e.g., rutile.
What type of metamorphism is Metasomatism?
metamorphic process process is referred to as metasomatism. If a granite is emplaced into a limestone, the contact region may be flooded with silica and other components, leading to the formation of a metasomatic rock. Often such contacts are chemically zoned.
What are 5 examples of metamorphic rocks?
Common metamorphic rocks include phyllite, schist, gneiss, quartzite and marble. Foliated Metamorphic Rocks: Some kinds of metamorphic rocks — granite gneiss and biotite schist are two examples — are strongly banded or foliated.
What is metasomatism?
Metasomatism refers to the process whereby a preexisting igneous, sedimentary, or metamorphic rock undergoes compositional and mineralogical transformations associated with chemical reactions triggered by the reaction of fluids (so-called metasomatic agents), which invade the protolith. Qiquan Ran,
Is Na (–K–Ca–Fe–H+) metasomatism present in intrusive centers?
Where present, Na–Ca metasomatism is either superimposed and related to external fluids ( Dilles et al., 1995) or forms limited volumes (generally ≤ 1 km 3) of various Na (–K–Ca–Fe–H +) types that are localized on the intrusive centers ( Seedorff et al., 2005 ).
Does Si-metasomatism affect the chemical composition of sedimentary rocks?
As for massive volcanic units, Si-metasomatism strongly disturbs the chemical composition of the original sediment (Rouchon and Orberger, 2008; Rouchon et al., 2009 ).