Chapter 18: Granitoid Rocks - Faculty web pages

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$Math 361 Problem Set #5 Due 5 October 2012 - Faculty web pages$

$Math 362 Problem Set #9 â€“ Solution 27 April 2012 - Faculty web ...$

M-type– direct mantle source; includes both immature arcplutons and oceanic plagiogranites found in ophiolites-oceanic crust (White, 1979)A-type– anorogenic, , commonly intruded into non-orogenicorogenicsettings• generally higher in SiO 2 , alkalies, , Fe/Mg, halogens F andCl, Zr than I-typesI
Table 18-3. The S-I-A-M Classification of GranitoidsType SiO 2 K 2 O/Na 2 O Ca, Sr A/(C+N+K)* Fe 3+ /Fe 2+ Cr, Ni δ 18 O 87 Sr/ 86 Sr Misc PetrogenesisM 46-70% low high low low low < 9‰ < 0.705 Low Rb, Th, U Subduction zoneLow LIL and HFS or ocean-intraplateMantle-derivedI 53-76% low high in low: metal- moderate low < 9‰ < 0.705 high LIL/HFS Subduction zonemafic uminous to med. Rb, Th, U Infracrustalrocks peraluminous hornblende Mafic to intermed.magnetite igneous sourceS 65-74% high low high low high > 9‰ > 0.707 variable LIL/HFS Subduction zonehigh Rb, Th, Umetaluminous biotite, cordierite SupracrustalAls, Grt, Ilmenite sedimentary sourceA high Na 2 O low var var low var var low LIL/HFS Anorogenic→ 77% high peralkaline high Fe/Mg Stable cratonhigh Ga/Al Rift zoneHigh REE, ZrHigh F, Cl* molar Al 2 O 3 /(CaO+Na 2 O+K 2 O) Data from White and Chappell (1983), Clarke (1992), Whalen (1985)
Page 1 and 2: Chapter 18: Granitoid Rocks“Grani
Page 3 and 4: 2) Because the crust is solid in it
Page 5 and 6: Zircon Xenocrysts - Hard, refractor
Page 7 and 8: Alumina saturation: Peraluminous -
Page 9: Granitoid classification: S-I-A-M S
Page 13 and 14: Anorogenic - magmatism within a pla
Page 15: Himalayas - Continent - continent c

Chapter 18: Granitoid Rocks - Faculty web pages

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