A comment on ‘Agpaicity revisited: pattern recognition in the chemistry of nepheline syenite rocks’ by Dagbert et al. |
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| Authors: | A.D Edgar |
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| Affiliation: | Department of Geology, University of Western Ontario, London, Ontario, N6A SB7, Canada |
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| Abstract: | The conclusions of Dagbertet al. (1975) on agpaicity are based on chemical and mineralogical data which may be characteristic of peralkalinity but not necessarily of agpaicity. Lack of significant variations in K in correspondence analysis can be explained on petrogenetic grounds and do not imply insignificance in agpaitic processes. The agpaitic coefficient merely indicates peralkalinity. |
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