On the distribution of atoms in magmatic systems: Normal geochemical law |
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| Authors: | B Choubert and L Zanone |
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| Institution: | (1) Centre d'Informatique Géologique, Ecole Nationale Supérieure des Mines de Paris, 35, rue Saint-Honoré, 77305 Fontainebleau, France |
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| Abstract: | A chemical analysis gives a solid base for a study of the distribution of elements in magmatic systems. Development of groups of constituent elements leads to the appearance of regularities which are translated by such close correlations that values for average rock compositions may be calculated using regression lines. These lines are divided into three segments corresponding to granitoids, gabbroids, and dunitoids. This normal geochemical law is not only valid for the average values obtained statistically but also for those obtained from petrographical families resulting from mineralogical classifications. The law also is true for the correlations:  valencies/volumes and valencies/theoretical densities. The existence of such a law governing the fundamental geochemical equilibria enables deductions and comparisons to be made with the composition of regional series. |
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| Keywords: | geochemistry magmatic rocks statistics |
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