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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
Classification of Geological Samples by Discriminant-Function Analysis
ABSTRACT
Discriminant-function analysis, a statistical method designed to treat problems of classification, may be described in terms of a simple geometrical model. In this light it is seen to represent a method of determining a series of lines along which previously established groups of items are best separated. Geologists are encouraged to grasp the intuitive rationale behind the method so that they may apply it to their own problems.
As a concrete example of the technique, chemical data on igneous, metamorphic and sedimentary rocks are analyzed. It is demonstrated that discriminant-function analysis provides an effective means of establishing the relationship between several suites of rocks. Specifically, it is demonstrated that, in one area at least, amphibolites are the metamorphosed equivalents of tholeiites.
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