EES 1030 Lecture 10: 10
11 May 2017
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Document Summary
The rock cycle: these are the paths and processes by which rock types change at the earth"s surface and interior. If you take igneous or sedimentary or metamorphic rocks + pressure/temperature = metamorphic rocks! Changes in mineralogy, texture, and often chemical composition of a solid rock occur because minerals and rocks experience conditions unlike those they formed under. The degree of metamorphism (the time over which a rock is being metamorphosed) And the specific ratios of heat/pressure/fluids (our metamorphic ____________________________) that the rock is exposed to--for example, really hot but low pressure? cooler, but higher pressure?--, etc. The metamorphic agents and their ratios vary greatly by environment (so metamorphic rocks, like many rocks and minerals, tell us about where they came from-they are also environmental fingerprints! Recall that at higher temperatures, chemical reactions will occur at faster rates. We see, with the addition of heat, recrystallization of existing minerals and also formation of new, stable minerals.
