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Minerals 2018, 8(8), 356; https://doi.org/10.3390/min8080356

Geology and Mineralogy of Rare Earth Elements Deposits and Occurrences in Finland

1
Geological Survey of Finland (GTK), Betonimiehenkuja 4, FI-02151 Espoo, Finland
2
Geological Survey of Finland (GTK), Lähteentie 2, FI-96101 Rovaniemi, Finland
3
Geological Survey of Finland (GTK), Neulaniementie 5, FI-70211 Kuopio, Finland
*
Author to whom correspondence should be addressed.
Received: 3 June 2018 / Revised: 3 July 2018 / Accepted: 5 July 2018 / Published: 18 August 2018
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Abstract

Rare earth elements (REE) have critical importance in the manufacturing of many electronic products in the high-tech and green-tech industries. Currently, mining and processing of REE is strongly concentrated in China. A substantial growth in global exploration for REE deposits has taken place in the recent years and has resulted in considerable advances in defining new resources. This study provides an overview of the mineralogical and petrological peculiarities of the most important REE prospects and metallogeny of REE in Finland. There is a particularly good potential for future discoveries of carbonatite hosted REE deposits in the Paleozoic Sokli carbonatite complex, as well as in the Paleoproterozoic Korsnäs and Kortejärvi Laivajoki areas. This review also provides information about the highest known REE concentration in the alkaline intrusions of Finland in the Tana Belt and other alkaline rock hosted occurrences (e.g., Otanmäki and Katajakangas). Significant REE enrichments in hydrothermal alteration zones are also known in the Kuusamo Belt (Uuniniemi and Honkilehto), and occurrences of REE-rich mineralisation are also present in granite pegmatite bodies and greisens in central and southern Finland (Kovela monazite granite and the Rapakivi Granite batholith at Vyborg, respectively). REE minerals in all of the localities listed above were identified and analyzed by scanning electron microscopy (SEM) and electron microprobes (EMPs). In localities of northern and central Finland, both primary rock forming and epigenetic-hydrothermal REE minerals were found, namely phosphates (monazite-Ce, xenotime-Y), fluorcarbonates (bastnäsite-Ce, synchysite), and hydrated carbonates (ancylite-Ce), hydrated aluminium silicates (allanite-Ce, Fe-allanite, cerite, chevkinite), oxides (fergusonite, euxenite) and U-Pb rich minerals. The chondrite normalized REE concentrations, the La/Nd ratios and the REE vs. major element contents in several types of REE bearing minerals from prospects in Finland can be used to identify and define variable REE fractionation processes (carbonatites), as well as to discriminate deposits of different origins. View Full-Text
Keywords: REE enrichments in carbonatite and alkaline rocks; REE in hydrothermal alteration zones and granitic rocks; REE mineralogy; crystal-chemistry of REE minerals; Finland REE enrichments in carbonatite and alkaline rocks; REE in hydrothermal alteration zones and granitic rocks; REE mineralogy; crystal-chemistry of REE minerals; Finland
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Al-Ani, T.; Molnár, F.; Lintinen, P.; Leinonen, S. Geology and Mineralogy of Rare Earth Elements Deposits and Occurrences in Finland. Minerals 2018, 8, 356.

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