“…Numerous thin (up to several tens of cm thick) meridional dykes of calcite–dolomite rocks are exposed in the eastern wall of the Svetlinsky quarry located on the East Uralian elevation at 26.7 km to the west of the town of Plast, Chelyabinsk region, Russia (54°17'45"N, 60°24'39"E). Brief descriptions can be found in Kolisnichenko and Popov (2008), Kolisnichenko et al (2014), Korinevsky et al (2019) and Korinevsky and Korinevsky (2020). These investigations provide geological and mineralogical evidence of the magmatic nature of these carbonate bodies rather than their metasomatic origin.…”
Section: Introductionmentioning
confidence: 99%
“…The presence of sulfide impregnations and sulphur aggregates in the rocks causes a strong hydrosulfuric smell during crushing. When the carbonate rock powder is heated in an open flame, intense yellow–orange thermoluminescence is observed (Korinevsky et al , 2019). Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Usually, it contains magnesium (MgO ≈1 wt.%) and iron (FeO up to 3.25 wt.%). Occasionally, sulfur (up to 8.46 wt.% of SO 3 ) and uranium (up to 0.05 wt.% of UO 2 ) were detected as a result of the presence of submicroscopic inclusions of native sulphur (Korinevsky et al , 2019) and uranium minerals. Some calcite grains contain syntactic growths of dolomite (Fig.…”
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): {
A
1Ca
A
2(Ca0.8REE0.2)}{
M
1(Al0.95Cr0.05)
M
2Al
M
3[(V,Cr)3+0.40Al0.35Mg0.25]}(Si2O7)(SiO4)O(OH).
“…Numerous thin (up to several tens of cm thick) meridional dykes of calcite–dolomite rocks are exposed in the eastern wall of the Svetlinsky quarry located on the East Uralian elevation at 26.7 km to the west of the town of Plast, Chelyabinsk region, Russia (54°17'45"N, 60°24'39"E). Brief descriptions can be found in Kolisnichenko and Popov (2008), Kolisnichenko et al (2014), Korinevsky et al (2019) and Korinevsky and Korinevsky (2020). These investigations provide geological and mineralogical evidence of the magmatic nature of these carbonate bodies rather than their metasomatic origin.…”
Section: Introductionmentioning
confidence: 99%
“…The presence of sulfide impregnations and sulphur aggregates in the rocks causes a strong hydrosulfuric smell during crushing. When the carbonate rock powder is heated in an open flame, intense yellow–orange thermoluminescence is observed (Korinevsky et al , 2019). Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Usually, it contains magnesium (MgO ≈1 wt.%) and iron (FeO up to 3.25 wt.%). Occasionally, sulfur (up to 8.46 wt.% of SO 3 ) and uranium (up to 0.05 wt.% of UO 2 ) were detected as a result of the presence of submicroscopic inclusions of native sulphur (Korinevsky et al , 2019) and uranium minerals. Some calcite grains contain syntactic growths of dolomite (Fig.…”
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): {
A
1Ca
A
2(Ca0.8REE0.2)}{
M
1(Al0.95Cr0.05)
M
2Al
M
3[(V,Cr)3+0.40Al0.35Mg0.25]}(Si2O7)(SiO4)O(OH).
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