About This Item
Share This Item
Amphibolites from Chandos Township, Peterborough County, Ontario, were classified by field criteria as
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.
End_of_Article - Last_Page 547------------