Abstract
A proposed geochemical law which states that “the concentration of an element in a specific igneous rock is lognormally distributed” is critically reviewed. It is shown 1. (a) that a lognormal law cannot apply even approximately to all the major constituents of a rock, 2. (b) that many minor elements will follow major constituents in failing to obey such a law. It is demonstrated that the dispersions of Ahrens's data for the minor elements of granite and diabase, and the extents which they exhibit an approximate lognormality, conform very largely with the known associations of the elements with other constituents of the two rock-types.
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