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Lecture 7

Lecture 7 - Metamorphic Rocks

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Earth Sciences
Earth Sciences 1022A/B
Stephen R Hicock

Lecture 7 NotesMetamorphic Rocks y MorphLatin for change y Starts off as sed Or ign Rocks y Often at plate boundaries y Heat and pressure y No melting y Controlling Factors o Parent RockControls composition o HeatMost important drives chemical reactions and recrystallization of host rock o PressureIncreases with depthConfining pressure y Pressure from every angleDirected pressure y Pressure perpendicular to the strata layers o Chemical ActivityIons in solution exchange with ions in minerals of the parents rock to form new minerals y Metamorphic Grade o High pressure vs low pressure o Increase with temperature o Index minerals from low grade to high grade y Contact Metamorphismo Local effect by magm
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