GEOL 1001 Chapter : Chapter 8
Document Summary
Metamorphism: transition of one rock into another by temperatures and/or pressures unlike those in which it formed, metamorphic rocks are produced from: Igneous rocks: sedimentary rocks, other metamorphic rocks, changes in heat, pressure, and the chemical environment of rocks can alter mineral composition and crystalline textures, metamorphic changes occur in the solid state, so there is no melting. Agents of metamorphism: heat, most important agent, recrystallization, two sources of heat, contact metamorphism heat from magma, an increase in temperature with depth, pressure and differential stress. Metamorphic textures: texture size, shape, and arrangement of mineral grains, foliation any particular arrangement of mineral grains or structural features within a rock, parallel alignment of platy and/or elongated minerals. Metamorphic textures: foliated textures (produced by non-uniformal, or differential, stress, slaty cleavage, non-foliated. Large grains, classed porphyrocrysts, surrounded by finer grained minerals. Recrystallization: change in texture growth of minerals, increase in grain size.
