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Crustal geometry of the central Skellefte district, northern Sweden: constraints from reflection seismic investigations
Department of Earth Sciences, Uppsala University.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-1627-7058
Department of Earth Sciences, Uppsala University.
Department of Earth Sciences, Uppsala University.
Vise andre og tillknytning
2012 (engelsk)Inngår i: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 524-525, s. 87-99Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The Palaeoproterozoic Skellefte mining district in Sweden is one of the most important mining districts in Europe. As a part of a 4D geologic modeling project, three new sub-parallel reflection seismic profiles, with a total length of about 95 km, were acquired in the central part of the district. Processed seismic data reveal a series of gentle- to steeply- dipping reflections and a series of diffraction packages. The majority of reflections that extend to the surface can be correlated with geological features either observed in the field or interpreted from the aeromagnetic map. A set of south-dipping reflections represent inferred syn-extensional listric extensional faults that were inverted during subsequent crustal-shortening. Cross-cutting north-dipping reflections are correlated to late-compressional break-back faults. Flat-lying reflections in the central parts of the study area could represent lithological contacts within the Skellefte Group, or the contact between Skellefte Group rocks and their unknown basement. Flat-lying reflections occurring further north are inferred to originate from the top of the Jörn intrusive complex or an intrusive contact within it. So far unknown south- and north-dipping faults have been identified in the vicinity of the Maurliden deposit. Based on the seismic results, a preliminary 3D-model has been created in order to visualize the fault pattern and to provide a base for future 3D/4D modeling in the Skellefte district.

sted, utgiver, år, opplag, sider
2012. Vol. 524-525, s. 87-99
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Forskningsprogram
Malmgeologi
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URN: urn:nbn:se:ltu:diva-15802DOI: 10.1016/j.tecto.2011.12.021ISI: 000301470900007Scopus ID: 2-s2.0-84856726555Lokal ID: f5c05137-205f-4b23-9d2e-adc8329aa56dOAI: oai:DiVA.org:ltu-15802DiVA, id: diva2:988777
Merknad
Validerad; 2012; 20111215 (tobbau)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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