Abstract

Seventy-eight specimens of the quartz monzonite from the Preissac-Lacorne batholith were thin sectioned, and modal analyses were made using the point count technique. The constituent minerals are group into four categories: total mafics, quartz, plagioclase, and potassium feldspar. A qualitative univariate an analysis of the geographic distribution and percentage data is illustrated by map figures and compared with the quantitative method. The geological significance of areal variations is discussed and the data are subjected to multivariate variance analysis which confirms suspected regional homogeneity and disproves the existence of significant local variations.

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