GEOLOGY
Viktor Alekseev, D.Sc. in Geological and Mineralogical Sciences, Professor at the Department of Mineralogy, Crystallography and Petrography , Saint Petersburg Mining University
Yuriy Marin, D.Sc. in Geological and Mineralogical Sciences, Professor at the Department of Mineralogy, Crystallography and Petrography , Saint Petersburg Mining University
Abstract
The research focused on the composition of tourmaline from tin ore deposits and ore occurrences within the Verkhneurmiysky ore cluster in the Amur region. The aim of the study is to determine the indicative signs of tourmaline from cassiterite-quartz and cassiterite-silicate formations. This research is based on the materials of a long-term study of the mineralogy of the Far East deposits, conducted at the Mining University under the scientific supervision of Professor Yu.B.Marin.
The relevance of the study involves predicting of tin and associated mineralization. For the first time, SIMS and Mössbauer spectroscopy were used to study tourmaline from this region. We identified the typomorphic characteristics of the tourmaline composition, which are proposed to be used as indicators of tin-ore deposits. Typomorphic characteristics of tourmaline from cassiterite-quartz formation: schorl (Mg/(Mg + Fe) = 0.06) with a high content of Al and K; Fe3+/(Fe3+ + Fe2+) = 0.03; ZFe3+ = 1 %; impurities: Nb, LREE (La, Ce, Pr), Be, Bi, F, Li, and Mn; LREE content > 9 ppm; positive Gd anomaly.
Typomorphic characteristics of tourmaline from cassiterite-silicate formation: schorl-dravite (Mg/(Mg + Fe) = 0.22) with a high Ca content; Fe3+ / (Fe3+ + Fe2+) = 0.17; ZFe3+ = 9 %; impurities: Zr, Y, Cr, V, Sn, In, Pb, W, Mo, Ti, HREE, Eu, Sr, Sb, and Sc; the content of Y is > 2 ppm, of HREE is > 3 ppm, Eu is > 0.1 ppm. The formation conditions of the cassiterite-silicate ore mineralization were more oxidizing than those of the cassiterite-quartz one. Tourmaline, formed under oxidizing conditions, contains such impurities as Sn, In, Nb, Bi, Sc, and LREE. The content of Sn isomorphic impurity in tourmaline reaches 8000 ppm.
Keywords: tourmaline; typomorphism; indicator; cassiterite-quartz formation; cassiterite-silicate formation; greisens; tourmalinites; Verkhneurmiysky ore cluster; Far East
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Publications:
- Alekseev V. I., Marin Y. B., Sukhanova K. G., Niobium Minerals As Indicators of a Genetic Link Between Tin-Bearing Zwitter and Lithium-Fluorine Granite of the Verkhneurmiysky Massif in the Amur River Region / Geology of Ore Deposits, № 8, V 60, 2019. pp. 698 - 707.
- Alekseev V. I., Marin Y. B., Unique Find of Rhenium-bearing Wolframite in Ongonites of the Russian Far East / Doklady Earth Sciences, № 2, V 478, 2018. pp. 250 - 252.
- Alekseev V. I., Marin Y. B., Gembitskaya I. M., Gahnite in Rare-Metal Metasomatic Rocks of the Upper Urmi River Ore Cluster, Amur River Region / Geology of Ore Deposits, № 8, V 59, 2017. pp. 765 - 772.
- Babushkina M. S., Marin Y. B., Ugolkov V. L., Nikitina L. P., Goncharov A. G., Hydrogen and Carbon Groups in the Structures of Rock-Forming Minerals of Rocks of the Lithospheric Mantle: FTIR and STA + QMS Data / Doklady Earth Sciences, № 479, V 2, 2017. pp. 456 - 459.
Scientifiс periodical «Zapiski Gornogo Instituta / Journal of Mining Institute» has been published since 1907 as a periodical scientific and scientific-educational edition in Saint-Petersburg Mining University. The periodicity of publishing is 6 volumes per year.