Agpaicity revisited: pattern recognition in the chemistry of nepheline syenite rocks |
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| Authors: | Michel Dagbert Raymond Pertsowsky Michel David Guy Perrault |
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| Institution: | Department of Mineral Engineering, Ecole Polytechnique, Université de Montréal, P.O. Box 6079, Station A, Montreal, Que. H3C 3A7, Canada |
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| Abstract: | An attempt is made to describe global variations in the geochemistry of major and minor elements within a population of nepheline syenite samples defined by mineralogical criteria.Using correspondence analysis, a new pattern recognition procedure, it is possible to define a few trends of common behaviour which reflect most of the initial dispersion.As Al and Na participate in the scattering along the two main trends, agpaicity is recorded by them. However, the traditional form of the coefficient which measures it is proved to be unsatisfactory as variations of K are not significant. |
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