Norra Kärr

Norra Kärr or Norra Kärr Alkaline Complex is an intrusive complex cropping out at the boundary between Östergötland and Småland, Sweden.[1][2] The complex is chiefly made up of peralkaline nepheline syenite and is rich in exotic minerals.[1] Rocks of the complex intruded into the Paleoproterozoic-aged Växjo granites of the Transscandinavian Igneous Belt.[1][2] Alfred Elis Törnebohm was the first to describe the rocks of Norra Kärr in 1906. Norra Kärr was discovered a few years earlier during regional geological maping by the Swedish Geological Survey. The complex derives its name from a local farm, which translates into English as "Northern Fen".[2] In 1968 Harry von Eckermann published his investigations on the complex defining its boundaries and confirming the view of it as an intrusion.[3]

A study has shown that the elevated rare-earth element concentrations in the bedrock in the Norra Kärr area are particularly well reflected in high contents of these elements in the fern Dryopteris filix-mas. This raises the possibility for the fern species to be used in biogeochemical prospecting.[4]

Norra Kärr is one of the two known sites where the mineral jinshajiangite can be found naturally, the other being in China.[5][6]

The Canadian mining company Tasman Metals Ltd has owned the mining rights of Norra Kärr since 2009,[7] the year when Tasman Metals Ltd conducted a study of northern Norra Kärr.[1]

References

  1. 1 2 3 4 "Report on the Geology, Mineralization and Exploration Potential of the Norra Kärr Zirconium-REE Deposit, Gränna, Sweden" (PDF). Tasman Metals Ldt. Archived from the original (PDF) on 2014-02-07. Retrieved 2013-01-04.
  2. 1 2 3 Sjöqvist, Axel S.L.; Cornell, David H.; Andersen, Tom; Erambert, Muriel; Ek, Mattias; Magnus, Leijd (2013). "Three Compositional Varieties of Rare-Earth Element Ore: Eudialyte-Group Minerals from the Norra Kärr Alkaline Complex, Southern Sweden". Minerals. 3 (1): 94–120.
  3. ↑ von Eckermann, Harry (1968). "New contributions to the interpretation of the genesis of the Norra Kärr alkaline body in Southern Sweden". Lithos. 1 (1): 76–88.
  4. ↑ Bluemel, Britt; Leijd, Magnus; Dunn, Colin; Hart, Craig J.R.; Saxon, Mark; Sadeghi, Martiya (2013). "Biogeochemical expression of rare earth element and zirconium mineralization at Norra Kärr, Southern Sweden" (PDF). Journal of Geochemical Exploration. 133 (15–24).
  5. ↑ Holtstam, Dan (1998). "Jinshajiangite from the Norra Kärr alkaline intrusion, Jönköping, Sweden". GFF. 120 (4): 373–374.
  6. ↑ Rastsvetaeva, R.K.; Chukanov, N.V.; Rozenberg, K.A. (2008). "Crystal Structure of Jinshajiangite from the Norra Kärr Complex (Sweden)" (PDF). Crystallography Reports. 53 (4): 553–556.
  7. ↑ Gränna kan bli nästa gruvort
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