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A novel approach identifies petrochemical groups in magmatic rocks, suggesting enhanced classification methods.
To single out petrochemical groups of magmatic rocks, a multidimensional space is proposed, whose coordinates are as follows: quartz-normativity (S = (Si – (2Ca″ + 3Na + 3K – Na′))/M), alkalinity (NKS = (Na + K)/Si), type of alkalinity (K/Na), the ratios (AF = (Al + Al′)/M), (Fe/Mg) and (CAF = (Ca′ + Al′)/(Fe + Mg)), where Ca′, Al′, Na′ are excessive with respect to feldspathic minal, Ca″ is calcium forming a part of feldspars, M = Fe + Mn + Mg + Ca′ + Al′ + Ti. The area of sampling hyperspace is characterized by mean values and their standard deviations. Whether of not the sample under study belongs to a reference group is defined either through checking the hypothesis of mean value equality or by means of the Rodionov’s homogeneity criterion.
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A. T. Khitrunov (1991) studied this question.
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