ESCI 401 Lecture Notes - Lecture 18: Gneiss, Phyllite, Overburden Pressure

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The edges of the grains dissolve on the sides where there"s pressure, and re-foliate on the sides where there"s no pressure. Happens in high temperatures where the rocks can form more easily. Changing a rock"s chemical composition by reactions with. Forms many valuable ore deposits: what is a foliation and how are foliated rocks classified? hydrothermal fluids, metamorphic rocks are classified by if they"re foliated or non-foliated, foliation (granoblastic) i. ii. iii. Flat or wavy parallel planes produced by directed pressure or differential stress. As you get to higher pressures and temperatures (metamorphic grade) you get more foliation that will eventually become banding. Planes of platey crystals (mica) align parallel to the foliation (which is created due to direct pressure) and giving a preferred orientation: splits easy i. ii. iii. i. ii. iii. iv. 3: layers can be millimeters to over a meter i. e. : slate, non-foliation.

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