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- W1500864037 abstract "A revised version of Graphic Normative Analysis Program (GNAP) has been developed to allow maximum flexibility in the evaluation of chemical data by the occasional computer user. GNAP calculates ClPW norms, Thornton and Tuttle's differentiation index, Barth's cations, Niggli values and values for variables defined by the user. Calculated values can be displayed graphically in X-Y plots or ternary diagrams. Plotting can be done on a line printer or Calcomp plotter with either weight percent or mole percent data. Modifications in the original program give the user some control over normative calculations for each sample. The number of user-defined variables that can be created from the data has been increased from ten to fifteen. Plotting and calculations can be based on the original data, data adjusted to sum to 100 percent, or data adjusted to sum to 100 percent without water. Analyses for which norms were previously not computable are now computed with footnotes that show excesses or deficiencies in oxides (or volatiles) not accounted for by the norm. This report contains a listing of the computer program, an explanation of the use of the program, and the two sample problems." @default.
- W1500864037 created "2016-06-24" @default.
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- W1500864037 date "1979-01-01" @default.
- W1500864037 modified "2023-09-26" @default.
- W1500864037 title "A revised version of Graphic Normative Analysis Program (GNAP) with examples of petrologic problem solving" @default.
- W1500864037 doi "https://doi.org/10.3133/ofr791237" @default.
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