11. It commonly accompanies metasomatism and is often a feature of wall rock alteration around ore bodies. 12. The magmas of the field probably formed in the lithosphere that had been affected by metasomatism . 13. Changes in composition can be caused by processes such as weathering or metasomatism ( hydrothermal alteration ). 14. It also occurs as alteration of manganese minerals such as rhodocrosite during low oxygen metamorphism and metasomatism . 15. Because metamorphism usually requires water in order to facilitate metamorphic reactions, metasomatism and metamorphism nearly always occur together. 16. As opposed to metasomatism , which is a chemical change caused by metamorphism, recrystallization is a physical process. 17. Sulfidic jasperoids are typical examples of silica-sulfide metasomatism of dolostones, and are found in Nevada and Iran. 18. Fluids rich in these have strongly affected the country rock and locally the granites themselves in a process called metasomatism . 19. Trace elements indicate that the parent body had a complex geologic history with partial melting, melt migration and metasomatism . 20. Metasomatism is the drastic change in the bulk chemical composition of a rock that often occurs during the processes of metamorphism.
