On distinguishing basaltic lavas of circum-oceanic and oceanic-island type by means of discriminant functions

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Abstract
The basaltic lavas of the oceanic-island environment are much richer in titania than those found on the landward flanks of the great deeps margining the open oceans. Exceptions to this rule are rare; examination of a large body of data indicates that the efficiency of a classification based solely on TiO 2 content would be nearly 93 percent. Neither any other single oxide nor any unweighted combination of oxides other than TiO 2 approaches the efficiency of TiO 2 . Extensive discriminant function calculations indicate: (1) Weighted linear combinations which include TiO 2 may be a slight improvement over TiO 2 alone. (2) Any combination of oxides which does not include TiO 2 is far less effective than TiO 2 alone.

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