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Glossary

chemical changes and replacement effect

About hydrothermal and wall rocks

[ metasomatism ] metasomatism, metasomatosis. For rocks metamorphism diagenesis, mainly in the contact metasomatic processes.

metamorphism, intrusion occurs surrounding rock and material exchange, into some of the new chemical components, with some of the original chemical composition, so that the chemical composition and mineral composition of rock occurs changes in the formation of new rock. Significant change in rock composition occurs in the process, generating a large number of new mineral. Metasomatism mainly in the contact metasomatic processes.

This effect of chemical composition and mineral composition changes, i.e. said metasomatism.

metasomatism performed substantially in a solid state, and essentially volume exchanged. Metasomatism factors, i.e. the equilibrium thermodynamic factors, such as the nature of the temperature, pressure, and chemical composition of rocks the solution, concentration and activity of the other components. As for the scope and depth of metasomatism, it is often the extent of fractures in the rock, and other development gap, the length of treatment time, the number of rock and the like hydrothermal stability determined.

Category

Types are named METASOMATISM the following three categories:

① to main elements named account such as potassium, sodium and other account;

② named in a major minerals, such as long petrochemicals, etc. sericite;

③ named mineral composition, clouds of quartzite, pyrite phyllic like.

role

Metasomatism a wide range, there may magmatic metasomatism, microcrystalline account of rock, the contact account the role of explanation, and various aqueous solutions of the gas metasomatism, even metasomatism occurs widely in weathering, deposition and metamorphism, as secondary vulcanization enrichment, granitization, migmatization, also by metasomatism.

is a typical rock skarn.

According to a feature can be divided into account the role of diffusion and bleeding into account metasomatism metasomatism.