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Reflection seismic investigations in the Dannemora area, central Sweden: insights into the geometry of polyphase deformation zones and magnetite-skarn deposits
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. (Controlled-source seismology)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
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2011 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 116, B11307- p.Article in journal (Refereed) Published
Abstract [en]

The Bergslagen region is one of the most ore prospective districts in Sweden. Presented here are results from two nearly 25 km long reflection seismic profiles crossing this region in the Dannemora mining area. The interpretations are constrained by seismic wave velocity measurements on a series of rock samples, cross-dip analysis, prestack time migration, and swath 3-D imaging, as well as by other available geophysical and geological observations. A series of major fault zones is imaged by the seismic data, as is a large mafic intrusion. However, the most prominent feature is a package of east-dipping reflectors found east of the Dannemora area that extend down to at least 3 km depth. This package is associated with a polyphase, ductile-brittle deformation zone with the latest ductile movement showing east-side-up or reverse kinematics. Its total vertical displacement is estimated to be in the order of 2.5 km. Also clearly imaged in the seismic data is a steeply dipping reflector near the Dannemora mine that extends down to a depth of at least 2.2 km. The geological nature of this reflector is not known, but it could represent either a fluid-bearing fault zone or a deep-seated iron deposit, making it an important target for further detailed geophysical and geological investigations.                   

Place, publisher, year, edition, pages
2011. Vol. 116, B11307- p.
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-165243DOI: 10.1029/2011JB008643ISI: 000297675200001OAI: oai:DiVA.org:uu-165243DiVA: diva2:472604
Available from: 2012-01-09 Created: 2012-01-04 Last updated: 2017-12-08Bibliographically approved

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Malehmir, AlirezaDahlin, PeterLundberg, EmilJuhlin, ChristopherSjöström, HåkanHögdahl, Karin

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