Chapter 18: Granitoid Rocks - Faculty web pages

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Chapter 18: Granitoid RocksGeneralizations:1) Most granitoids of significant volume occur in areaswhere the continental crust has been thickened byorogenyEither continental arc subduction or continentalcollisionMany granites may post-date the thickening event bytens of millions of years.
2) Because the crust is solid in its normal state, somethermal disturbance is required to form granitoids3) Thought the majority of granitoids are derived bycrustal partial meltingMantle may also be involvedMantle contribution may range from a heat sourcefor crustal partial melting to source of material aswell
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Page 9 and 10: Granitoid classification: S-I-A-M S
Page 11 and 12: Table 18-3. The S-I-A-M Classificat
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Chapter 18: Granitoid Rocks - Faculty web pages

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