Electrical resistivity structure of the Yellowknife River Fault Zone and surrounding region

Abstract:

Electromagnetic data, using the natural-source magnetotelluric (MT) technique, were acquired in the southwestern part of the Archean Slave craton, northwestern Canada, as a contribution to two geoscientific programs to determine the crustal and lithospheric mantle electrical resistivity structure. As part of LITHOPROBE, Canada’s national geoscience project (Clowes et al., 1999), during the summer of 1996 MT time series were recorded at twelve sites on the all-weather road along an approximately east-west profile, of direct-line length of 130 km, with the city of Yellowknife in its centre (Fig. 13-C1, sites 003-014). Two additional LITHOPROBE sites (Fig. 13-C1, sites 032 and 033) were acquired in March, 1999 east of Yellowknife in lakes just north of the all-weather road (the Ingraham Trail). Subsequently, as part of EXTECH III activities, a profile of seven sites was recorded in March, 2000 across the surface trace of the Yellowknife River Fault Zone (Bleeker and Ketchum, 1998) some 10 km north of the first profile (Fig. 13-C1, sites 101-107), plus an eighth site (site 045) along the LITHOPROBE profile. The purpose of the LITHOPROBE surveys was to define the gross geological architecture of Canada, with its central aim of Evolution of a Continent. Thus, the 1996 and 1999 LITHOPROBE sites recorded broadband MT (BBMT) and long period MT (LMT) data at frequencies suitable for regional-scale crustal probing with site spacing on the or-

Año de publicación:

2006

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