4-dimensional geological modelling of the Skellefte district, Sweden
The Skellefte mining District is located in northern Sweden and comprises Palaeoproterozoic, metamorphosed, supracrustal rocks and associated intrusive rocks, which are all host to several ore deposits. Modelling was performed in the GoCAD software platform, using structural geology and petrology as well as magnetic, gravity, seismic, electric and electromagnetic geophysical data, in order to produce robust 3-dimensional models for the upper 3000 m of the Earth's crust in selected areas within the Skellefte District. Further interpretations from the regional structures and tectonics are providing a base for restoring the geological history of the district in time, the 4 dimension. * Corresponding author
Description of regional geological and geophysical maps of the Skellefte District and surrounding areas
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Geological, geochemical and geochronological evidence for a new palaeoproterozoic terrane in southeastern Sweden
The geological and geochronological relationships between a rhyolite, belonging to the Transscandinavian Igneous Belt (TIB), and an intrusive suite (the Backaby intrusion), southeast Sweden, have been investigated by means of bedrock mapping, geochemistry and radiometric age determinations (UPb on zircons). Field relations suggest that the rhyolite rests unconformably on the Backaby intrusion, which previously has been correlated with ∼ 1.9 Ga granitoids within the Svecofennian Domain. The rhyolite yielded an age of 1800 ± 8 Ma and a tonalite belonging to the Backaby intrusion basement yielded an age of 1834 ± 3 Ma. The age of the rhyolite is slightly older (10–15 Ma) than adjacent granitoids belonging to the Transscandinavian Igneous Belt, and is considered as the earliest magmatic expression of TIB in the area. The age and the geochemical trends for the Backaby intrusion is significantly different from that of the surrounding TIB granitoids and indicate a rock forming event at about 1830–1840 Ma in southeastern Sweden represented by the Oskarshamn-Jonkoping Belt. This event is significantly younger than the older Svecofennian rocks within the Svecofennian Domain proper, indicating a hitherto unidentified geological terrane in southeastern Sweden.