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Reflection Seismic Investigation in the Western Part of the Paleoproterozoic VHMS-Bearing Skellefte District, Northern Sweden: Reflection Seismic Investigation in the Western Part of the Paleoproterozoic VHMS-Bearing Skellefte District, Northern Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Geophysics.
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2006 (English)In: Economic Geology, Vol. 101, 1039-1054 p.Article in journal (Refereed) Published
Description
Abstract [en]

The Skellefte district forms part of the Svecofennian ca. 1.90 to 1.80 Ga, supracrustal sequence and associated

intrusive rocks in the northern part of Sweden. The western part of the Skellefte district, which is the most

important metallogenic province in northern Sweden today, hosts major volcanic-hosted massive sulfide

(VHMS) deposits (e.g., the 23 million metric tons (Mt) Kristineberg Cu-Zn-Pb-Ag-Au deposit). In order to obtain

a better understanding of the VHMS ore potential at depth, new seismic reflection data were acquired

along two parallel and 25-km-long profiles in the Kristineberg area in 2003. The data were collected with the

purpose of obtaining high-resolution images of the top 10 km of the crust and are presented here for the first

time. Although the structural setting is very complex, the stacked sections reveal numerous reflections that can

be correlated with surface geology. Visible on both profiles is a pronounced north-dipping band of reflections

marking a boundary between relatively transparent crust above and significantly more reflective crust beneath

it. We interpret this reflective crust to represent a structural basement to the ore-bearing Skellefte Group, possibly

constituting Bothnian basin metasedimentary rocks bordering the Skellefte district to the south. This new

interpretation is important for the understanding of the tectonic evolution of the Skellefte district and for

defining exploration strategies in the area. The seismic results suggest that the Kristineberg and Rävliden deposits

occur on the northern limb of a kilometer-scale local second-order syncline within the hinge zone of a

major antiform. Results from a profile located approximately 8 km to the west of the Kristineberg mine indicate

that the Revsund granitoid has a thickness of about 3 to 3.5 km. Ultramafic rocks are also imaged clearly.

Diffraction patterns and bright-spot reflectivity is interpreted as originating from either mafic to ultramafic intrusions

or a mineralization zone at 3- to 5-km depth. These results help to identify new prospective areas and

mineral potential, both downplunge from known ores and on the same stratigraphic horizon on the southern

limb of the ore-bearing syncline. The seismic reflection profiling has been effective in imaging the major structures

around the Kristineberg orebody, demonstrating that this technique can be used for delineating complex

structures significant for mineral exploration.

Place, publisher, year, edition, pages
2006. Vol. 101, 1039-1054 p.
Keyword [en]
Skellefte, reflection seismic
Identifiers
URN: urn:nbn:se:uu:diva-24577OAI: oai:DiVA.org:uu-24577DiVA: diva2:52351
Available from: 2007-02-06 Created: 2007-02-06 Last updated: 2017-08-11

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Tryggvason, AriMalehmir, AlirezaJuhlin, Christopher

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