Abstract
Two groups of methods of measuring the strain ellipse from elliptical grains are applied to deformed slates and sandstones, and the results are compared against one another. Group I includes the slope method and the method of means that measures the arithmetic, geometric, and harmonic means of grain axial ratios. Group II includes more sophiticated methods, and includes R f φ , the method of Shimamoto & Ikeda, the Robin method and a numerical version of the polar graph. This study shows that among group I, the harmonic mean method best approximates the strain ratio ( R s ) at moderate strain. Among group II, there is a good linear correlation among R s calculated by the Robin method, Shimamoto & Ikeda, R f φ , and to a lesser extent, the numerical polar graph. A graph incorporating the results of this study permits simple calculation of R s from the harmonic mean of grain axial ratios for deformed rocks with similar lithologic and deformational characteristics to the samples used.
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