International Journal of Earth Sciences

, Volume 98, Issue 5, pp 1027–1052 | Cite as

Geochronological, stable isotopes and fluid inclusion constraints for a premetamorphic development of the intrusive-hosted Björkdal Au deposit, northern Sweden

  • K. Billström
  • C. Broman
  • E. Jonsson
  • C. Recio
  • A. J. Boyce
  • P. Torssander
Original Paper


The Björkdal gold deposit, bound to a quartz vein system which is mainly hosted by a quartz-monzodioritic intrusion, is situated at the easternmost part of the 1.9 Ga Skellefte base metal district in the Fennoscandian shield. Three fluid stages may be distinguished, referred to as a “barren” stage, a main gold stage, and a remobilization stage, respectively. From oxygen and hydrogen isotope evidence, it is argued that fluids of different origins (magmatic and surface waters) penetrated the ore zone at the inferred stages, but regional metamorphic fluids appear essentially only to have redistributed elements. Early quartz veining took place during a pre-metamorphic stage at ca. 1.88 Ga, as evidenced by unradiogenic galena data and an Sm–Nd scheelite errorchron of 1,915 ± 32 Ma (MSWD = 0.25). Temporarily, the main ore-forming stage was closely related to the first barren stage and took place during a major uplift event close to 1.88 Ga. Although other source rocks cannot be totally ruled out, available isotope data (O, S, Sr and Pb) are seemingly consistent with the view that these elements, and by inference other ore elements, were derived from the host intrusion.


Au ore Quartz lode Skellefte district Fennoscandian shield Isotopes Fluid evolution 



This paper has benefited significantly by numerous discussions with Pär Weihed, Jeanette Bergman Weihed, Ingemar Lundström and the staff at Terra Mining. Previous draft versions have been reviewed by Pasi Eilu, Robert Kerrich, Robert Moritz, Jon Naden and an anonymous journal editor, and their help is gratefully acknowledged. Fredrik Grensman, Ingemar Lundström and Björn Albino have provided samples for this study. Isotope work was financed by NUTEK (Swedish National Board for Industrial and Technical Development) within the frames of the research programme “Ore geology related to prospecting” (PIM).


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • K. Billström
    • 1
  • C. Broman
    • 2
  • E. Jonsson
    • 3
    • 6
  • C. Recio
    • 4
  • A. J. Boyce
    • 5
  • P. Torssander
    • 2
  1. 1.Laboratory for Isotope GeologySwedish Museum of Natural HistoryStockholmSweden
  2. 2.Department of Geology and GeochemistryStockholm UniversityStockholmSweden
  3. 3.Department of MineralogySwedish Museum of Natural HistoryStockholmSweden
  4. 4.Departamento de GeologíaUniversidad de SalamancaSalamancaSpain
  5. 5.SUERCEast KilbrideScotland, UK
  6. 6.Geological Survey of SwedenUppsalaSweden

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