Potential Field, Geoelectrical and Reflection Seismic Investigations for Massive Sulphide Exploration in the Skellefte Mining District, Northern Sweden

• Published in: Acta Geophysica
• Main Authors: Tavakoli, Saman, Dehghannejad, Mahdieh, Garcia Juanatey, Maria de los Angeles, Bauer, Tobias E., Weihed, Pär, Elming, Sten-Åke
• Format: Article in Journal/Newspaper
• Language: English
• Published: Uppsala universitet, Geofysik 2016
• Subjects: potential field data; seismic reflection; resistivity; induced polarization; magnetotelluric; 3D modeling; Geophysics; Geofysik; Northern Sweden
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-316139; https://doi.org/10.1515/acgeo-2016-0088

Multi-scale geophysical studies were conducted in the central Skellefte district (CSD) in order to delineate the geometry of the upper crust (down to maximum similar to 4.5 km depth) for prospecting volcanic massive sulphide (VMS) mineralization. These geophysical investigations include potential field, resistivity/induced polarization (IP), reflection seismic and magnetotelluric (MT) data which were collected between 2009 and 2010. The interpretations were divided in two scales: (i) shallow (similar to 1.5 km) and (ii) deep (similar to 4.5 km). Physical properties of the rocks, including density, magnetic susceptibility, resistivity and chargeability, were also used to improve interpretations. The study result delineates the geometry of the upper crust in the CSD and new models were suggested based on new and joint geophysical interpretation which can benefit VMS prospecting in the area. The result also indicates that a strongly conductive zone detected by resistivity/IP data may have been missed using other geophysical data.