European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 4
Articles | Volume 38, issue 4
https://doi.org/10.5194/ejm-38-431-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-431-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 4
Research article
 | 
20 Jul 2026
Research article |  | 20 Jul 2026

Fluorine-induced melting in the Ihalainen calcite-wollastonite marble deposit, Lappeenranta, Finland

Robert F. Martin, Dirk Schumann, Markku J. Lehtinen, and Sebastian Fuchs

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Short summary
The Ihalainen deposit in Finland produces wollastonite, a silicate of calcium. It formed 1.86 x 109 years ago; 240 x 106 years later, the area was invaded by a fluorine-rich granitic magma, which interacted with the marble host. The silicate magma lost silica and alkalis; the marble melted. A fluorine-rich vapor phase mobilized niobium, tantalum, and tin to form unknown minerals. The fluid was initially CO2-dominant and then became aqueous and formed a complex assemblage of alteration minerals.
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