Abstract
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 ∼ 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 (∼ 1.5 km) and (ii) deep (∼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.
Highlights
The Skellefte mining district (Fig. 1) is regarded as a major ore district in Sweden and one of the main paleoproterozoic arc systems in the world (Weihed 2010) which produces base metals including Zn, Cu, Pb, Ag, and Au, from volcanic massive sulphide (VMS) and organic gold deposits (Bauer 2010)
Multiple geophysical data including magnetic, gravity, resistivity, induced polarization (IP), MT and seismic reflection data were integrated in the central Skellefte district to confirm or improve previous interpretations
The result from near-surface investigations confirms that the sulphide mineralization often occurs within the lowermost contact of the Vargfors basin and uppermost part of the Skellefte Group felsic volcanic rocks
Summary
The Skellefte mining district (Fig. 1) is regarded as a major ore district in Sweden and one of the main paleoproterozoic arc systems in the world (Weihed 2010) which produces base metals including Zn, Cu, Pb, Ag, and Au, from VMS and organic gold deposits (Bauer 2010). Exploration activities, including geological and geophysical investigations were initiated in 2008 in the CSD within a framework of the VINNOVA 4D project These efforts were conducted to expand exploration activities using multiple geological and geophysical studies by modeling the crust in 3D, followed by illustrating the dynamic evolution of the crust through 4D-animation (Skyttä 2012). These geophysical investigations were conducted in the field between 2009 and 2010 (Table 1)
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