GEO 303 Lecture Notes - Lecture 9: Facies, Biotite, Schist
10 May 2016
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Study the power points, book supports them, test focuses on book. *evaporates vs. precipitates: evap form by thermal evaporation, leave concentrated ions in mineral. Precipitates involves other process that alters those crystallization. Definitions: recrystallization of a prior rock (could be all three, metamorphism causes recrystallization, temperature and pressure source of change, after metamorphism, they"re a different rock, most important thing: no melting (melt=igneous) Digenesis: pressure isn"t enough to turn into a metamorphic rock. High temp without pressure is possible (volcanoes and dikes: ingredients of metamorphism: In crystal framework of hydrous minerals: occurs in a closed chemical system. Elements aren"t lost, they are arranged in different ways: metamorphic rocks have parents. Increasing the amount can further change the mineral. In contact with something that produces it, changed mainly by heat due to contact with magma. The heating and degree of contact metamorphism will decrease away from the source.
