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- W2144394401 abstract "Alkali-alumina and MgO-alumina plots are an effective instrument for displaying chemical and mineralogical compositions of altered and unaltered rhyolites and rhyodacites. They reveal that most supposedly unaltered rhyolites, apart from those of Cenozoic age, have undergone losses in Na2O and gains in K2O. The extreme loss of Na2O from highly altered rhyolites immediately adjacent to VMS deposits is strikingly illustrated by alkali-alumina plots. MgO/Al2O3 vs. K2O/Al2O3 diagrams display a strong negative correlation between MgO and K2O that results from the conversion of sericite to chlorite. A similar negative correlation between MgO and whole-rock δ 18 O is apparent on plots of these two parameters. Alkali-alumina plots underscore problems in selecting appropriate precursor compositions required for mass-balance calculations. Molar ratio plots are a viable alternative to such calculations. © 2006" @default.
- W2144394401 created "2016-06-24" @default.
- W2144394401 creator A5067019268 @default.
- W2144394401 creator A5089086727 @default.
- W2144394401 date "2006-01-01" @default.
- W2144394401 modified "2023-09-24" @default.
- W2144394401 title "Alkali-Alumina and MgO-Alumina Molar Ratios of Altered and Unaltered Rhyolites" @default.
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- W2144394401 doi "https://doi.org/10.2113/gsemg.15.1-2.75" @default.
- W2144394401 hasPublicationYear "2006" @default.
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