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

P. Skytta*, T. Bauer, T. Hermansson, M. Dehghannejad, C. Juhlin, M. Garcia Juanatey, J. Hubert, P. Weihed

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 3D model which is available as a 3-D PDF document through the publication website.

Original languageEnglish
Pages (from-to)387-404
Number of pages18
Journal Solid Earth
Volume4
Issue number2
DOIs
Publication statusPublished - 2013

Keywords

  • REFLECTION SEISMIC INVESTIGATIONS
  • MASSIVE SULFIDE DEPOSITS
  • SKELLEFTE ORE DISTRICT
  • NORTHERN SWEDEN
  • MINING AREA
  • FENNOSCANDIAN SHIELD
  • WESTERN PART
  • 3D CONSTRAINTS
  • GA
  • ARCHITECTURE

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