Alekseev and 2 co-authors reported on a new finding of Zn-spinel (gahnite) in biotite metasomatic rock of the Verkhneurmiysky copper– tungsten–tin ore cluster in eastern Russia, including the chemical composition of gahnite, its paragenesis, and place in the regional evolution history of hydrothermal processes.
Gahnite is commonly localized in biotite–microcline metasomatic rocks at the lower sub-ore stage of the greisen metasomatic column in proximity to the exocontact of the rare-metal granite massif. Gahnite from rare-metal ore occurrences belongs to the hercynite–gahnite–franklinite isomorphic series and contains significant isomorphic admixtures of iron (24.3%) and manganese (0.65%).
Based on our results and earlier published data, they authors concluded that gahnite can be a mineral-indicator of rare-metal metasomatism.
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