| 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. |
| Genre: | USGS Numbered Series |
| ProdID: | 11358 |
| Citation Author: | Stuckless, J. S.; VanTrump, G. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 115 p. :ill. ;29 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 79-1237 |
| Citation Search Results Text: | A revised version of Graphic Normative Analysis Program (GNAP) with examples of petrologic problem solving; 1979; OFR; 79-1237; Stuckless, J. S.; VanTrump, G. |
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| Citation Year: | 1979 |
| Type: | citation/reference |
| Text: | A revised version of Graphic Normative Analysis Program (GNAP) with examples of petrologic problem solving; 1979; OFR; 79-1237; Stuckless, J. S.; VanTrump, G. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1979/1237/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1979/1237/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
