Earth Sciences 2281A/B Lecture Notes - Lecture 7: Metamorphism, Metasomatism, Uniformitarianism

• School: Western University
• Department: Earth Sciences
• Course: Earth Sciences 2281A/B
• Professor: Robert Schincariol

Document Summary

Def: the solid-state (without melting) transformation of pre-existing rock into texturally or mineralogically distinct new rock as a result of high temperature, high pressure, or both. Two main types of metamorphism: regional and contact. Main factors controlling the characteristics of metamorphic rocks: (fig. 4. composition of parent rock temperature and pressure during metamorphism tectonic forces effects of fluids (e. g. water) Def: metamorphic rock as a result of high pressure and high temperature. The majority of metamorphic rocks found on the earth"s surface are products of regional metamorphism. Recrystallization plastic flow contorts layers and other constituents such as pebbles. Def: high temperatures are the dominant factor with relatively low confining pressures (<10 km burial depth) Associated with igneous intrusions and occur over small areas (contact aureole 1-50 metres wide) Metasomatism - is metamorphism coupled with the introduction of ions from an external source and may occur during regional or contact metamorphism.