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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 48 (1964)

Issue: 4. (April)

First Page: 546

Last Page: 547

Title: Test of the Discriminant Function in the Amphibolite Problem: ABSTRACT

Author(s): D. M. Shaw, A. M. Kudo

Article Type: Meeting abstract


Amphibolites from Chandos Township, Peterborough County, Ontario, were classified by field criteria as

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ortho-amphibolite, para-amphibolite, or of uncertain origin. Following analysis for major and 8 trace elements, discriminant functions were calculated for the ortho and para groups, and used to classify rocks in the uncertain category.

Using analyses of Ti, Al, Fe+3, Fe+2, Mn, Mg, Ca, P, CO2 in 11 rocks in each group, the discriminant function gives a probability of misclassification of 5.4%.

Analyses of Cr, V, Ni, Co, Sc, Sr, Ba, Zr on 20 rocks in each group gives a discriminant function with 5.7% probability of misclassification.

Ti, Fe+2, Mn, P, Co, and Sc are the most effective elements for discrimination.

It is not yet certain whether this approach will have universal applications regardless of the geological setting of an amphibolite.

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Copyright 1997 American Association of Petroleum Geologists