Instructions on how to calculate the CIPW norm are available in your favourite petrology textbook, here, or here. For starters you should do fine with the norm. The most common norm calculation method is the CIPW norm, but there are other methods as well. A norm is an estimation of the ideal mineralogy of an igneous rock, based on the chemical composition of the rock. Your solution should consist of two steps.įinding what is the norm of the rock. While doing something like this may be interesting for homework exercise, it is not something I would expect to see in a recent research article. They do not take into account many factors affecting the various characteristics of the rocks. Furthermore, these diagrams are merely descriptive and not genetic. They are not designed with the chemical composition of the rocks in the mind. The QAPF and related diagrams are intended for classification of rocks in the field, or preliminary classification with modal proportions as seen in the optical microscope.
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