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

Tavakoli S., Dehghannejad M., García Juanatey M. d. A., Bauer T. E., Weihed P., Elming S.-A.

Acta Geophysica

2016

Vol. 64, no. 6

2171--2199

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.

Geometria i ewolucja wybranych struktur solnych z obszaru Niżu Polskiego w świetle danych sejsmicznych

Krzywiec P.

Przegląd Geologiczny

2009

Vol. 57, nr 9

812-812

Permo-Mesozoic Mid-Polish Trough formed eastern segment of the Southern Permian Basin, within which thick series of the Upper Permian (Zechstein) evaporites, including rock salt, have been deposited. During subsidence phase the presence of thick salt series led to regional decoupling between sub-salt basement and supra salt Mesozoic sedimentary cover, and to development of various salt structures. Evolution of salt pillows and diapirs was genetically related to activity of the basement fault zones. The Goleniów, Dzwonowo-Człopa, Damasławek, Mogilno, Kłodawa and Lubień salt diapirs have been analyzed using conventional seismic reflection data acquired during petroleum exploration, and - in case of Damasławek and Lubień diapirs - shallow high-resolution seismic data. Interpretation of available seismic data gave new insight into geometry of these salt structures, finally shaped during Late Cretaceous-Palaeogene inversion of the Mid-Polish Trough and partly modified during younger (Neogene- Quaternary) phases of their tectonic activity.