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Crystal chemistry and origin of REE-bearing mukhinite from carbonate veins of the Svetlinsky gold deposit, South Urals, Russia

Published online by Cambridge University Press:  12 May 2022

Victor G. Korinevsky ,
Nikita V. Chukanov ,
Sergey M. Aksenov Open the ORCID record for Sergey M. Aksenov [Opens in a new window] ,
Evgeniy V. Korinevsky ,
Vasiliy A. Kotlyarov ,
Dmitry А. Zamyatin ,
Anastasiya D. Ryanskaya ,
Sergey V. Kolisnichenko ,
Svetlana M. Lebedeva  and
Vera N. Ermolaeva
Victor G. Korinevsky
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology of the Uralian Branch of the Russian Academy of Sciences, Miass, Chelyabinsk oblast 456317, Russia
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991, Russia
Sergey M. Aksenov*
Affiliation:
Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic, Kola Science Centre, Russian Academy of Sciences, Apatity 184209, Russia Geological Institute, Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184209, Russia
Evgeniy V. Korinevsky
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology of the Uralian Branch of the Russian Academy of Sciences, Miass, Chelyabinsk oblast 456317, Russia
Vasiliy A. Kotlyarov
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology of the Uralian Branch of the Russian Academy of Sciences, Miass, Chelyabinsk oblast 456317, Russia
Dmitry А. Zamyatin
Affiliation:
Institute of Geology and Geochemistry of the Uralian Branch of the Russian Academy of Sciences, Ekaterinburg 620016, Russia
Anastasiya D. Ryanskaya
Affiliation:
Institute of Geology and Geochemistry of the Uralian Branch of the Russian Academy of Sciences, Ekaterinburg 620016, Russia
Sergey V. Kolisnichenko
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology of the Uralian Branch of the Russian Academy of Sciences, Miass, Chelyabinsk oblast 456317, Russia
Svetlana M. Lebedeva
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology of the Uralian Branch of the Russian Academy of Sciences, Miass, Chelyabinsk oblast 456317, Russia
Vera N. Ermolaeva
Affiliation:
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
*
*Author for correspondence: Sergey M. Aksenov, Email: aks.crys@gmail.com
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Abstract

A rare earth element (REE)-, Cr- and Mg-bearing variety of the vanadium epidote-group mineral mukhinite occurs in a calcite–dolomite carbonatite dyke cutting metamorphosed volcano-sedimentary rocks exposed in the walls of the quarry of the Svetlinsky gold deposit, South Urals. This mineral was found in a paragene assemblage including native sulphur, phlogopite and fluorophlogopite, together with accessory pyrite, other sulfides and sulfosalts, gold, Cr- and V-bearing muscovite, margarite, Cr- and V-bearing dravite, fluoro-tremolite, actinolite, fluoro-pargasite, anhydrite, apatite, uranium hydroxides, V-rich titanite, V- and Nb-rich rutile, spinel and corundum. The contents of ΣREE2O3 and V2O3 in mukhinite vary in the ranges of 4.01–9.69 and 5.34–7.46 wt.%, respectively. A Raman spectrum of REE-rich mukhinite is provided. The main schemes of isomorphic substitutions in mukhinite are ΣREE + Mg ↔ Ca + Al and V+Cr ↔ Al. The crystal structure of REE-rich mukhinite has been studied by single-crystal X-ray diffraction analysis. The mineral is monoclinic, with the space group P21/m, and unit-cell parameters are: a = 8.8972(11) Å, b = 5.6221(6) Å, c = 10.1519(12) Å, β = 115.169° and V = 459.60(11) Å3. The crystal structure of REE-rich mukhinite is similar to that of its synthetic analogue; the refined crystal-chemical formula of the sample studied is (Z = 2): {A1CaA2(Ca0.8REE0.2)}{M1(Al0.95Cr0.05)M2AlM3[(V,Cr)3+0.40Al0.35Mg0.25]}(Si2O7)(SiO4)O(OH).

Keywords

REE-rich mukhiniteepidote groupcrystal structurecarbonatitesSvetlinsky gold depositSouth Urals
Type
Article
Information
Mineralogical Magazine , Volume 86 , Issue 5 , October 2022 , pp. 821 - 833
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

#

Deceased

Associate Editor: Mihoko Hoshino

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