105-16 9-30 Absolute rock dating, metamorphic rx

It is typically represented by the dimensional

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Unformatted text preview: (often later folded) formed in metamorphic rocks during their deformation. It is typically represented by the dimensional alignment of sheet-like minerals (e.g. micas) and/or by alternating layers of different mineral composition. Increasing metamorphic grade —————> Hand samples of regional metamorphic rocks. L to R: slate, phyllite, schist, gneiss. Types of foliation with increasing grade Progressive metamorphism … Shale (mud- or clay-rich rock) + heat + pressure Slate. Pioneer Mtns., Idaho. Schist. Pioneer Mtns., Idaho. garnet-quartzmica schist Folded quartzo-feldspathic gneiss (originally a sandstone or granitic rock) Foliation in regionally metamorphosed rocks is usually subhorizontal in orientation because the stresses that produce it are a conseq...
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This note was uploaded on 05/11/2013 for the course GEOL 105Lg taught by Professor Davis,platt during the Fall '07 term at USC.

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