Miocene and younger basalts (e.g., Chilcotin) as well as Eocene and Jurassic to Cretaceous age volcanic and sedimentary rocks (e.g., Endako Group, Ootsa Lake Group, Taylor Creek Group) underlie significant portions of the Interior Plateau and Nechako Basin of central British Columbia.
There is potential for unexploited hydrocarbon and base metal resources underlying these younger volcanic and sedimentary successions and hence this area is of economic interest. Geophysical surveys (both seismic reflection and magnetotellurics), funded by GeoscienceBC and the Geological Survey of Canada, have concentrated on:
- portions of the Nechako Basin for hydrocarbon potential within mostly Jurassic and Cretaceous sedimentary rocks (Ferri & Riddell; 2006; Riddell, 2006, Riddell et. al 2007), and
- portions of the Interior Plateau to facilitate exploration for base metals.
To help interpret variations in geophysical signals, we have measured the geophysical properties (density, porosity, magnetic susceptibility and seismic velocity) for 50 samples of the Miocene Chilcotin Group. We are expanding our ongoing experimental studies by directly measuring the geophysical properties (e.g., magnetic properties, density, porosity, electrical conductivity, and VP & VS) of key lithologies within the Nechako Basin.
This project is directly relevant to the Geoscience BC mandate because our proposed dataset would aid in processing of raw seismic and magnetotelluric data and result in more accurate geophysical images (seismograms) of the subsurface and delineation of exploration targets.