Earth: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]
Mine project
 | |
| Location | |
|---|---|
| Jönköping County | |
| Country | Sweden |
| Production | |
| Products | Rare earth elements and Zirconium |
The Norra Kärr mine project represents one of the largest zirconium reserves in Sweden having estimated reserves of 58 million tonnes of ore grading 1.7% zirconium metal.[7]
Since 2009, the Canadian company Tasman Metals has owned the mining rights and explored for rare earth elements in the Norra Kärr area.[8][1]
In February 2016 the supreme administrative court of Sweden withdrew Tasman's exploitation concession for Norra Kärr.
References
- ↑ 1.0 1.1 1.2 1.3 "Report on the Geology, Mineralization and Exploration Potential of the Norra Kärr Zirconium-REE Deposit, Gränna, Sweden". Tasman Metals Ldt. http://www.tasmanmetals.com/i/pdf/43-101-NorraKarr-091113.pdf.
- ↑ 2.0 2.1 2.2 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. doi:10.3390/min3010094.
- ↑ 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. doi:10.1016/S0024-4937(68)80037-4.
- ↑ 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". Journal of Geochemical Exploration 133 (15–24). http://s3.amazonaws.com/academia.edu.documents/42309795/Biogeochemical_expression_of_rare_earth_20160207-26197-82e2jk.pdf?AWSAccessKeyId=AKIAIWOWYYGZ2Y53UL3A&Expires=1501031702&Signature=Dwi4V%2F9j9XUDUVR1noN4nb3nxJQ%3D&response-content-disposition=inline%3B%20filename%3DBiogeochemical_expression_of_rare_earth.pdf.[|permanent dead link|dead link}}]
- ↑ Holtstam, Dan (1998). "Jinshajiangite from the Norra Kärr alkaline intrusion, Jönköping, Sweden". GFF 120 (4): 373–374. doi:10.1080/11035899801204373.
- ↑ Rastsvetaeva, R.K.; Chukanov, N.V.; Rozenberg, K.A. (2008). "Crystal Structure of Jinshajiangite from the Norra Kärr Complex (Sweden)". Crystallography Reports 53 (4): 553–556. doi:10.1134/S1063774508040044. https://www.researchgate.net/publication/244654036.
- ↑ "Norra Kärr mine". tasmanmetals.com. 2012. http://www.tasmanmetals.com/i/pdf/Tasman-Metals-PEA-May-2012.pdf.
- ↑ "Gränna kan bli nästa gruvort". http://www.iva.se/IVA-Aktuellt/IVA-aktuellt-artiklar/Granna-kan-bli-nasta-gruvort/.
External links
- Bryta jordartsmetaller i Norra Kärr? - Presentation av Olov Holmstrand, 2016-04-02 (in Swedish), Naturskyddsföreningen i Tranås [Swedish Society for Nature Conservation in Tranås]
- Vattnets väg från Norra Kärr - Presentation av Stellan Hamrin, 2016-04-02 (in Swedish) Naturskyddsföreningen i Tranås [Swedish Society for Nature Conservation in Tranås]
[ ⚑ ] 58°06′07″N 14°33′54″E / 58.102°N 14.565°E
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