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Iron-bearing to iron-rich tourmalines from granitic pegmatites of the Murzinka Pluton, Central Urals, Russia
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Iron-bearing to iron-rich tourmalines from granitic pegmatites of the Murzinka Pluton, Central Urals, Russia
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Journal Article
Iron-bearing to iron-rich tourmalines from granitic pegmatites of the Murzinka Pluton, Central Urals, Russia
2022
Overview
Black tourmalines from seven granitic pegmatites (Golodnaya, Kazennitsa, Mokrusha, Kopi Mora, Zheltyye Yamy, Buzheninov Bor and Ministerskaya) related to the Murzinka pluton, Central Urals, Russia have been investigated using electron microprobe analysis, LA-ICP-MS, Raman and Mössbauer spectroscopy. Pegmatites are hosted by serpentinites and gneisses and are classified as schorl, oxy-schorl, fluor-schorl, dravite, oxy-dravite, foitite, oxy-foitite and darrellhenryite. The possible compositional evolution of tourmalines from the Ural pegmatites is as follows: Mg-rich dravite through to Fe-rich schorl, foitite and oxy-foitite to Fe- and Mn-rich darrellhenryite. The major substitutions in the tourmalines are: (1) Fe2+ ⇌ Mg; (2) Al + WO2- ⇌ Fe2+ + WOH-; (3) X-site vacancy + Al ⇌ Na + Fe2+; (4) Al + WO2- ⇌ Mg + WOH-; (5) X-site vacancy + Al ⇌ Na + Mg; and (6) Fe ⇌ Mn. Statistical processing of the trace- and major-element composition distinguished three tourmaline groups: (1) trace Co, Ni, Pb, and major Ca and Mg; (2) uni-, di- and trivalent traces (Li, Zn, Ga) and di- and trivalent majors (Al, Mn); (3) U, Th, Hf, Ta, Nb, Y, In, and Sn which correspond to tri-, tetra-, and pentavalent high-field-strength elements. Mössbauer data shows the Fe3+/Fe2+ ratios in tourmalines from pegmatites hosted by gneisses (0.05-0.18) and serpentinites (0.28-0.65), indicates different oxidising environments. Raman data are consistent with the composition of the tourmalines.
Publisher
Cambridge University Press on behalf of the Mineralogical Society of the UK and Ireland,Cambridge University Press
Subject
/ Commonwealth of Independent States
/ dravite
/ foitite
/ granites
/ igneous and metamorphic rocks
/ iron
/ metals
/ Mines
/ Quartz
/ schorl
/ spectra
/ Sverdlovsk Russian Federation
/ Urals
/ vacancy
