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Norma
A tool to calculate the CIPW norm from whole-rock chemistry
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Abstract
Norma Dr. Caco (2012). Implementation of the calculation of the CIPW norm designed by Cross, Iddings, Pirsson and Washington.
Data should be prepared in a txt file separated by tabs. If a first row with labels is included in the file, the row must begin with the '%' character.
Order of the rows is at follows: %SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 CO2 SO3 S F Cl Sr Ba Ni Cr Zr. Major elements, including S,F and Cl, should be in weight % while trace elements (i.e. Sr, Ba, Ni, Cr, Zr) should be reported in ppm. If the analysis doesn't have a particular element fill the appropriate cell with a zero and the norm will be calculated without such element. If speciation of iron is not known, fill the ferric iron column with zeros and the ferrous iron column with total iron calculated as follows: FeO= 0.8998*Fe2O3 Speciation of the iron will be estimated according to an intrinsic buffer, following Cortes et al., (2006). Available options are QFM, NNO and HM. The norm can be also calculated normalized if desired (although not recommended). To upload the data into Norma input field simply right click on the data window (Command-click in a Mac) and an uploading scrollbar will be displayed. When your data is uploaded, click on "Simulate" and the result will be presented in the output window next. Results can be downloaded clicking on the download button (green arrow pointing down) located in the upper-right corner of the window. Enjoy!
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