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International Journal of Earth Sciences

, Volume 102, Issue 2, pp 385–400 | Cite as

Fault-controlled sedimentation in a progressively opening extensional basin: the Palaeoproterozoic Vargfors basin, Skellefte mining district, Sweden

  • Tobias E. BauerEmail author
  • Pietari Skyttä
  • Rodney L. Allen
  • Pär Weihed
Original Paper

Abstract

The Vargfors basin in the central part of the Skellefte mining district is an inverted sedimentary basin within a Palaeoproterozoic (1.89 Ga) marine volcanic arc. The fault-segmented basin formed from upper-crustal extension and subsequent compression, following a period of intense sub-marine volcanism and VMS ore formation. New detailed mapping reveals variations in stratigraphy attributed to syn-extensional sedimentation, as well as provenance of conglomerate clasts associated with tectonic activity at the transition from extension to compression. The onset of fan delta to alluvial fan sedimentation associated with basin subsidence indicates that significant dip-slip displacement accommodating rapid uplift of the intrusive complex and/or subsidence of the adjacent volcano-sedimentary domain took place along a major fault zone at the southern margin of the intrusive complex. Subsidence of the Jörn intrusive complex and/or its burial by sedimentary units caused a break in erosion of the intrusion and favoured the deposition of a tonalite clast-barren conglomerate. Clast compositions of conglomerates show that the syn-extensional deposits become younger in the south-eastern parts of the basin, indicating that opening of the basin progressed from north-west to south-east. Subsequent basin inversion, associated with the accretion to the Karelian margin, involved reverse activation of the normal faults and development of related upright synclines. Progressive crustal shortening caused the formation of break-back faults accompanied by mafic volcanic activity that particularly affected the southern contact of the Jörn intrusive complex and the northern contact of the Vargfors basin.

Keywords

Palaeoproterozoic Skellefte district Conglomerates Basin inversion Alluvial fan Facies analysis 

Notes

Acknowledgments

This work is part of the VINNOVA 4D-modelling project and the PROMINE project, financed by VINNOVA and Boliden Mineral AB and the European Union, respectively. Constructive comments from reviewer Peter Druschke and a second anonymous reviewer and the editor Wolf-Christian Dullo are much appreciated. The 4D-modelling workgroup is thanked for contributions and discussions. Dave Coller, Michael Stephens, and Tobias Hermansson are acknowledged for the interesting discussions and ideas. This is a publication of the Centre of Advanced Mining and Metallurgy (CAMM).

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Tobias E. Bauer
    • 1
    Email author
  • Pietari Skyttä
    • 1
  • Rodney L. Allen
    • 1
    • 2
  • Pär Weihed
    • 1
  1. 1.Division of Geosciences and Environmental EngineeringLuleå University of TechnologyLuleåSweden
  2. 2.Boliden Mineral ABBolidenSweden

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