Ontology type: schema:ScholarlyArticle Open Access: True
1973-06
AUTHORS ABSTRACTIn pelitic rocks, under conditions of low fO2 and low fH2O, the stability of the mineral pair cordierite-garnet is limited by five univariant reactions. In sequence from high pressure and low temperature to high temperature and low pressure these are: cordierite+garnet⇄ hypersthene+sillimanite+quartz, cordierite+garnet⇄ hypersthene+sapphirine+quartz, cordierite+garnet⇄ hypersthene+spinel+quartz and cordierite+garnet⇄ olivine+spinel +quartz. In this sequence of reactions the Mg/Mg+Fe2+ ratio of all ferro-magnesian minerals involved decreases continuously from the first reaction to the fifth. The five univariant boundaries delimit a wide P-T range over which cordierite and garnet may coexist.Two divariant equilibria in which the Mg/Mg+ Fe2+ ratio of the coexisting phases are uniquely determined by pressure and temperature have been studied in detail. P-T-X grids for the reactions cordierite⇄ garnet+sillimanite+quartz and cordierite+hypersthene⇄ garnet+quartz are used to obtain pressure-temperature estimates for several high grade metamorphic areas. The results suggest temperatures of formation of 700–850° C and load pressures of 5–10 kb. In rare occasions temperatures of 950–1000° C appear to have been reached during granulite metamorphism.On the basis of melting experiments in pelitic compositions it is suggested that Ca-poor garnet xenocrysts found in calc-alkaline magmas derive from admixed pelitic rocks and did not equilibrate with the calc-alkaline magma. More... »
PAGES151-166
http://scigraph.springernature.com/pub.10.1007/bf00373879
DOIhttp://dx.doi.org/10.1007/bf00373879
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