Abstract
Summary The Western Superior region is part of the Canadian shield and is located north from the Superior Lake. The area has huge economic significance because several gold and base metal mineral deposits can be found there. Magnetotellurics is a useful tool to investigate the deep structure of the craton and find geological connections with the existing ore deposits. In this paper we present the results of magnetotelluric (MT) inversion of a subset of Lithoprobe and EartScope data collection covering this region. 92 MT stations were selected for 3D inversion, 79 from the Lithoprobe project and 13 from the EarthScope database. The regularized Gauss-Newton method was used applying data-space implementation. The algorithm inverts the full MT impedance and tipper data simultaneously. Based on the results, several conductive anomalies were identified in the Earth’s crust and upper mantle. Recovered 3D conductivity model was compared with known tectonic structures, earlier geoelectric studies and seismic measurements. The deepest conductor appeared below the depth of 300 km. Three elongated quasi-vertical conductive anomalies between 100 and 300 km depth may represent the zones of partially melted material rising through the upper mantle.
Published Version
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