Analysis of Strain, Shape, and Orientation of the Deformed Pebbles in the Seine River Area, Ontario

Abstract

<p> Detailed mapping was carried out to provide reliable data concerning the geologic structure which is relevant to the original pebble fabrics. </p> <p> Mathematical determination of an ellipsoidal shape from any two cross-sections and its application to the study of deformed ellipsoidal particles are developed and discussed. </p> <p> Final pebble fabric resulting from special coaxial superpositions of the tectonic strain ellipsoid upon originally ellipsoidal pebbles, is employed to determine the strain ratio and the original pebble orientation and shape. </p> <p> Some general techniques are outlined for different cases to determine the strain ellipsoid and the original shape of deformed pebbles. Weighted vector mean is introduced in the orientation analysis of deformed pebbles. The concept of average axial ratio in the case of unextractable pebbles is examined. </p> <p> Pebble size, pebble ductility ratio, shortening strain, and strain rate are all calculated and discussed. Finally, selective veins developing in the less-deformed pebbles are subjected to detailed orientation and petrofabric analyses. </p>