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Solid Earth An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 2
Solid Earth, 4, 387-404, 2013
https://doi.org/10.5194/se-4-387-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Solid Earth, 4, 387-404, 2013
https://doi.org/10.5194/se-4-387-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 31 Oct 2013

Research article | 31 Oct 2013

Crustal 3-D geometry of the Kristineberg area (Sweden) with implications on VMS deposits

P. Skyttä1,2, T. Bauer1, T. Hermansson2, M. Dehghannejad3, C. Juhlin3, M. García Juanatey3, J. Hübert3, and P. Weihed1 P. Skyttä et al.
  • 1Division of Geosciences and Environmental Engineering, Luleå University of Technology, 97187 Luleå, Sweden
  • 2Boliden Mineral AB, 93681 Boliden, Sweden
  • 3Uppsala University, Department of Earth Sciences, Villavägen 16, 75236 Uppsala, Sweden

Abstract. Structural analysis of the Palaeoproterozoic volcanogenic massive sulfide (VMS) hosting Kristineberg area, Sweden, constrained by existing magnetotelluric (MT) and seismic reflection data, reveals that the complex geometry characterized by non-cylindrical antiformal structures is due to transpression along the termination of a major high-strain zone. Similar orientations of the host rock deformation fabrics and the VMS ore lenses indicate that the present-day geometry of the complex VMS deposits in the Kristineberg area may be attributed to tectonic transposition. The tectonic transposition was dominantly controlled by reverse shearing and related upright to overturned folding, with increasing contribution of strike-slip shearing and sub-horizontal flow towards greater crustal depths. Furthermore, the northerly dip of the previously recognized subsurface crustal reflector within the Kristineberg area is attributed to formation of crustal compartments with opposite polarities within the scale of the whole Skellefte district. The resulting structural framework of the main geological units is visualized in a 3-D model which is available as a 3-D PDF document through the publication website.

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