Quantitative phase petrology of cordierite-orthoamphibole gneisses and related rocks
JFA Diener, R Powell, RW White
JOURNAL OF METAMORPHIC GEOLOGY | WILEY-BLACKWELL | Published : 2008
Cordierite-orthoamphibole gneisses and rocks of similar composition commonly contain low-variance mineral assemblages that can provide useful information about the metamorphic evolution of a terrane. New calculated petrogenetic grids and pseudosections are presented in the FeO-MgO-Al2O3-SiO2-H2O (FMASH), Na2O-CaO-K2O-FeO-MgO-Al2 O3- SiO2-H2O (NCKFMASH) and Na2O-CaO-K2O-FeO-MgO-Al2O3- SiO2-H2O-TiO2-Fe2 O3 (NCKFMASHTO) chemical systems to investigate quantitatively the phase relations in these rocks. Although the bulk compositions of cordierite-orthoamphibole gneisses are close to FMASH, calculations in this system do not adequately account for the observed range of mineral assemblages. Calcul..View full abstract
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JFAD acknowledges support from IPRS and MIRS scholarships held at the University of Melbourne. RP acknowledges the support of ARC DP0451770 and RWW acknowledges the support of ARC DP0557013. G. Droop, J. Schumacher and F. Spear are thanked for helpful reviews and M. Brown is thanked for his thorough editorial handling of the manuscript.