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Fen Complex, Nome, Telemark, Norway

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Name(s) in local language(s): Fensfeltet, Nome kommune, Telemark fylke, Norge
 
Famous for its rare volcanic/meta-volcanic rocks:

Carbonatites: søvite (coarse-grained calcite carbonatite), rødberg (altered carbonatite with hematite stained granular calcite, dolomite and sometimes ankerite), rauhaugite (dolomite carbonatite), ringite (coars-grained carbonatite containing aegirine and alkali-feldspar).
Lamprophyres: damkjernite (melanocratic nepheline lamprophyre).
Ijolites: melteigite (melanocratic nepheline ijolite), hollaite (calcite-melteigite, consisting of pyroxene (55%), calcite and nepheline).
Other rocks: fenite (metasomatic rock composed of alkali feldspar, sodic pyroxene and/or alkali amphibole, sometimes monomineralic alkali feldspar rock), vibetoite (pyroxenite containing aboundant Ti-augite and hornblende with biotite, primary calcite, and occasional albite and nepheline).

Many of the rocks were first described by W. C. Brøgger in 1921.
Most areas of the complex are now protected because of its value to science, and collecting is prohibited!

Mineral List

Mineral list contains entries from the region specified including sub-localities


97 entries listed. 56 valid minerals.

Localities in this Region


The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Brøgger, W.C. (1921) Die Eruptivgesteine des Kristianiagebietes. IV. Das Fengebiet in Telemark, Norwegen. Skrifter udgit av Videnskabsselskabet i Kristiania. I. Math. Nat. Klasse. No.9, p. 1-408.

Aubert, F.(1947): Identifisering av de Nb-Ta-førende mineraler i søvitt, og forsøk på deres magnetiske separasjon. Tidsskrift for kjemi, Bergvesen og Metallurgi. 7, 169-171

Bjørlykke, (1953): Utnytting av Søvemalm. Tidsskrift for Kjemi, Bergvesen og Metallurgi. 13, 47-48.

Sørum, H.(1955): Contribution to the mineralogy of Søve deposit. I. X-ray identification of accessory minerals. Det Konglige Norske Videnskabsselskap Forhandlinger, B 28, 112-119.

Sørum, H.(1955): Contribution to the Mineralogy of the Søve Deposit. II. X-ray and thermal studies of the niobium minerals. Det Konglige Norske Videnskabsselskap Forhandlinger, B 28, 120-127

Sæther, E.(1957): The alkaline rock province of the Fen area in southern Norway. Det Konglige Norske Videnskabsselskaps Skrifter 1957, 1, 150p.

Barth,, T.F.W. & Ramberg, I.B. (1966): The Fen circular complex. In Tuttle, O.F. & Gittins, J.(eds). Carbonatites. Interscience, New York, USA. 225-257

Åmli, R. (1977): Carbonatites, a possible source of Scandium as indicated by Sc-mineralization in the Fen peralkaline complex, Southern Norway. Economic Geology 72: 855-859

Andersen, T. (1984) Secondary processes in carbonatites: petrology of "rødberg" (hematite-calcite-dolomite carbonatite) in the Fen central complex, Telemark (south Norway). Lithos: 17: 227-245.

Andersen, T. (1986) Compositional variation of some rare earth minerals from the Fen complex (Telemark, SE Norway): implications for the mobility of rare earths in a carbonatite system. Mineralogical Magazine: 50: 503-509.

Andersen, T. (1988) Evolution of peralkaline calcite carbonatite magmas. Experimentally determined trace and minor element partitioning in the Fen complex, southeast Norway. Lithos: 22: 99-112.

Andersen, T. (1989): Carbonatite-related contact metasomatism in the Fen complex, Norway: effects and petrogenetic implications. Mineralogical Magazine. 53: 395-414

Dahlgren, S. (1993): Fensfeltet-et stykke eksplosiv geologi. Stein. 20 (3), 146-155

Årtveit, J. T. (2014): Fensfeltet. Fensfeltet Geologiforening, Ulefoss 2014, 192p.

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