Regional-scale geometry of the central Skellefte district, northern Sweden—results from 2.5D potential field modeling along three previously acquired seismic profiles

Deep massive sulphide exploration using 2D and 3D geoelectrical and induced polarization data in Skellefte mining district, northern Sweden

“…Mafic volcanic rocks of the Skellefte Group occur often as intercalation of basalts along the contact between felsic volcanic rocks and the Jörn granodiorites (Tavakoli et al . , b). Resistivity and chargeability along profile E‐1 indicate that upper parts of the U2 can depict the basalts, which partly underlie the outcropping felsic volcanic rocks and the Jörn granodiorite and appear as high‐resistivity and relatively high‐chargeability zones (Fig.…”

“…) and gravity and magnetic modelling from this area suggest that the Jörn granitoids superimpose a more resistive and denser unit of tonalite/basalt (García Juanatey ; Tavakoli et al . , b). As indicated by resistivity/chargeability result from profile E‐1, the Jörn Intrusion, together with its underlying basalts/tonalite or unaltered granodiorite, extends further than ∼1.5 km in depth and dips towards NE (Fig.…”

“…() and Tavakoli et al . (2012a, b). This interest in studying deeper targets led to several joint geophysical studies (e.g., Malehmir et al .…”

“…; Tavakoli, Elming, and Thunehed ; Tavakoli et al . ; García Juanatey ). A general need to explore and map structures at larger depth, e.g., down to ∼5 km, is discussed in de Kemp et al .…”

“…(); Malehmir, Thunehed, and Tryggvason (); and Tavakoli et al . (2012a, b)), which were successful in detecting high strain zones related to the sulphide mineralization and visualizing lithological contacts. Geoelectrical surveys with subsequent data inversion have previously succeeded in visualizing complicated subsurface geometries (Wong and Strangway ; Li and Oldenburg ; Magnusson, Fernlund, and Dahlin ; Commer et al .…”