A Study of Acoustic Velocity and Dielectric Permittivity Anisotropy in Relation to Finite Strain in Deformed Rock
The Cambrian Slate Belt of Wales provides an ideal laboratory for comparing variations in total natural strain with variations in other physical parameters. A large fold structure at Penrhyn Quarry, Bethesda, North Wales, U.K. has been mapped and its three dimensional strain determined from natural indicators. The strain has subsequently been calibrated against the degree of preferred orientation of phyllosilicate minerals which is then used independently as a strain measure. Velocity of propagation of acoustic waves and dielectric permittivity were measured for samples from the quarry and then compared with strain determined by preferred orientation for the same samples. Further measurements of acoustic velocity were done on samples from locations along the axis of the Welsh Cambrian Slate Belt and on samples from other regions including the Appalacian fold belt.
University of Illinois - Urbana-Champaign
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University of Illinois at Urbana-Champaign