INTERPRETATION OF GLACIOTECTONIZED SEDIMENT AT TRAVERS RESERVOIR, SOUTHERN ALBERTA, CANADA: AN INTEGRATED GEOPHYSICAL AND GEOMORPHOLOGICAL APPROACH
Electrical resistivity is a function of porosity, saturation, material texture, and resistivity of the pore fluids and the solid phase. Resistivity data was collected using the Sting-Swift R1 IP resistivity meter. A 38 meter line, with one meter electrode spacing, was run four meters back from the exposure. Two separate types of arrays were used to take measurements: (1) the Wenner array and (2) the dipole-dipole array. By combining the results of these two arrays, a more accurate depiction of the subsurface is possible.
This methodology was successful in imaging subsurface architecture. Tills, fluvial and lacustrine sediments, bedrock, and structural features such as faults, exhibit large contrasts in their physical properties. Electrical resistivity imaging, when integrated with detailed geomorphologic analysis, provides enhanced insight for inferring the processes of sediment emplacement and deformational processes. Preliminary results indicate that the sediments that make up the hummocky landforms were not emplaced by supraglacial meltout as with traditional models, but underwent subglacial or proglacial emplacement and deformation.