Figure G-42a is a sketch of a hand specimen of oolite. The orientations of the principal strain axes have been determined in the field on the basis of lineations, cleavages, and the shapes of the ooids. Two thinsections have been cut perpendicular to two of the principal strain axes, and Fig. G-42b contains sketches of photomicrographs of each of the two thin-sections.

1. Measure the dimensions of several ooids and determine the arithmetic mean (x̄) of the semi-major and semi-minor axes in each field of view. Indicate the semi-major to semi-minor axes ratio for each field of view, and combine these ratios to find the 1 + e: 1 + e₂: 1 + e₃ ratio for the strain ellipsoid.

2. Plot the strain ellipsoid on the Flinn diagram in Fig. G-42c.

Transcribed Image Text:

1 + €₂ a 8 8 Semi-major axis X = PHO Semi-minor axis X = Semi-major axis X = 1 + €3 Semi-minor axis X= ·1+ €1 -1 + €₂ 1 + €3. +₁