Sokli

Sokli, Finland

Deposit type: carbonatite

REE minerals:

Ore minerals:

Gangue minerals:

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The Sokli carbonatite (approximately 360 – 380 Ma) in north eastern Finland, a part of the Devonian Kola alkaline province, hosts an unexploited deeply weathered phosphate deposit enriched in niobium (Nb), tantalum (Ta), zirconium (Zr), REE and uranium (U). The carbonatite intrusion consists of a magmatic phoscorite-carbonatite core, surrounded by metacarbonatite and a wide fenite aureole, altogether about 9 km in diameter. Late-stage carbonatite veins in the magmatic core and in the fenite zone have high potential for REE mineralisation (Vartiainen, 1980; Al Ani and Sarapää, 2013). Chemical analyses from drill cores show that the carbonatite veins are enriched in phosphorus pentoxide (P2O5) (19.9 weight per cent), strontium (Sr) (1.9 weight per cent), barium (Ba) (6.8 weight per cent), Zn (0.3 weight per cent) and also have a high total REE content of 0.5 – 1.8 weight per cent (Sarapää et al., 2013). The mineral assemblage includes REE-bearing ancylite-(Ce) and bastnäsite-(Ce), Sr-apatite, monazite, strontianite, baryte and brabantite, rich in LREE, P, fluorine (F), Sr and Ba. During late-stage processes, apatite and carbonate minerals were replaced by various assemblages of REE-Sr-Ba minerals.

References

  1. https://en.wikipedia.org

  2. http://www.eurare.eu/countries/finland.html

  3. http://tupa.gtk.fi/julkaisu/specialpaper/sp_053.pdf

  4. https://books.google.cl/books?id=ZCXrCAAAQBAJ&pg=PR6&lpg=PR6&dq=Kimito+Finland+ree+deposits&source=bl&ots=C2_fCjAZKF&sig=DJ2mlzyCKNaY89t6OkgrdAXpGoE&hl=ru&sa=X&redir_esc=y#v=onepage&q=Kimito%20Finland%20ree%20deposits&f=false

  5. http://finland.fi/life-society/nature-in-finland/

  6. http://finland.fi/wp-content/uploads/2011/07/nature10.jpg

@ Ph.D. Natalia Petrovskaya

June, 2016

nataliapetrovsky@gmail.com