Olga Y Plotinskaya | Institute Ore Geology, Geochemistry, Mineralogy And Petrography Igem Ras, Moscow (original) (raw)

Papers by Olga Y Plotinskaya

Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass sp... more Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass spectrometry data from molybdenite within two porphyry copper deposits (Kalinovskoe and Birgilda) of the Birgilda-Tomino ore cluster (South Urals) are presented. † The results provide evidence that molybdenites from these two sites have similar trace-element chemistry. Most trace elements (Si, Fe, Co, Cu, Zn, Ag, Sb, Te, Pb, Bi, Au, As and Se) form mineral inclusions within molybdenite. The Re contents in molybdenite vary from 8.7 ppm to 1.13 wt.%. The Re distribution within single molybdenite flakes is always extremely heterogeneous. It is argued that a temperature decrease favours the formation of Re-rich molybdenite. The high Re content of molybdenite observed points to a mantle-derived source.

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Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass sp... more Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass spectrometry data from molybdenite within two porphyry copper deposits (Kalinovskoe and Birgilda) of the Birgilda-Tomino ore cluster (South Urals) are presented. The results provide evidence that molybdenites from these two sites have similar trace-element chemistry. Most trace elements (Si, Fe, Co, Cu, Zn, Ag, Sb, Te, Pb, Bi, Au, As and Se) form mineral inclusions within molybdenite. The Re contents in molybdenite vary from 8.7 ppm to 1.13 wt.%. The Re distribution within single molybdenite flakes is always extremely heterogeneous. It is argued that a temperature decrease favours the formation of Re-rich molybdenite. The high Re content of molybdenite observed points to a mantle-derived source.

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Mineral assemblages and formation conditions of precious metals (Au, Ag, PGE) in ores of the Mikh... more Mineral assemblages and formation conditions of precious metals (Au, Ag, PGE) in ores of the Mikheevskoe porphyry copper deposit (South Urals) are the subject of our study. Three mineralization types can be distinguished:
(1) Gold-silver-telluride mineralization overlapping porphyry-style bornite-chalcopyrite ores includes
native gold (fineness 863–873), electrum (fineness 593–672), galena, hessite, coloradoite, and, more rarely, petzite, stützite, Au-Ag ditellurides, native tellurium, tellurobismuthite, tetradymite–kawazulite, altaite, and extremely rare melonite NiTe2, merenskyite PdTe2, and sopcheite Ag4Pd3Te4;
(2) Gold-arsenopyrite-basemetal mineralization within quartz-tetrahedrite-sphalerite veinlets cutting porphyry-style mineralization;
(3) Gold-telluride mineralization with argillic alteration and mineralogically similar to that of type (1) but distinct because of the presence of Au-Ag, Ag, and Pb selenides.
Textural relationships supported by fluid inclusions data and chlorite geothermometry provide evidence that occurrence of precious metals minerals at the Mikheevskoe deposit is mostly linked to epithermal overprint of the porphyry mineralization and was deposited at ca. 300–200 °C from moderately saline fluids (ca. 5–10 wt%-eq.NaCl). It is suggested that the observed variability in
Au and Ag minerals results from small fluctuations of S2 and/or Te2 fugacity.

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The paper presents new geochronological and isotopic geochemical data on gold mineralization of t... more The paper presents new geochronological and isotopic geochemical data on gold mineralization of the Kedrovskoe deposit. The deposit is located in the northeastern part of the Transbaikal metallogenic province, Russia's largest. The Early Permian age (273 ± 4 Ma) of mineralization based on the results of Rb– Sr study of metasomatic rocks is correlated with the age of the final phases of Hercynian magmatism in the Baikal–Muya Foldbelt. The Sr, Nd, and Pb isotopic geochemical characteristics of mineralization show that the host rocks are involved in the formation of the latter. It has been established that ore lead was supplied to the hydrothermal system of the deposit mainly from a geochemical reservoir represented by the Neoprotero-zoic juvenile continental crust of the Baikal–Muya Foldbelt.

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“Magmatism of the Earth and related strategic metal deposits”. Proceedings of XXXIV International Conference. Miass, 4-9 August 2017, 2017

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The Urals can be regarded as a significant Cu-Mo-porphyry province, hosting over 30 porphyry depo... more The Urals can be regarded as a significant Cu-Mo-porphyry province, hosting over 30 porphyry deposits. Although their geological structure and ore-forming processes have been studied in great detail, uncertainty remains about their age and related geotectonic setting. In this contribution we report for the first time the Re-Os dating of molybdenites from three Cu-Mo porphyry deposits, namely Kalinovskoe, Mikheevskoe and Talitsa. Three molybdenite samples from the Kalinovskoe deposit yield Silurian Re-Os ages ranging from 427.1 Ma to 431.7 Ma (mean 429.8 ± 4.8 Ma; 2σ standard deviation), and a Re–Os isochron age of 430.7 ± 1.3 Ma (MSWD = 0.63), which coincides with previous U-Pb zircon dating of ore-hosting diorites from the same ore field (427 ± 6 Ma). The molybdenite from the Mikheevskoe deposit gives Re-Os ages of 357.8 ± 1.8 Ma and 356.1 ± 1.4 Ma (mean 357.0 ± 2.4 Ma; Carboniferous/Tournaisian), which corresponds to previous U-Pb dating of zircons from the diorite hosting porphyry deposit (356 ± 6 Ma). The molybdenite from Talitsa Mo-porphyry deposit yields the youngest Re-Os ages of 298.3 ± 1.3 and 299.9 ± 2.9 Ma (mean 299.1 ± 2.3 Ma) at Carboniferous-Permian boundary. Thus, the studied Cu and Mo porphyry deposits are not synchronous and belong to distinct tectonic events of the Urals.

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The paper provides the first data on lead isotopic composition of porphyry and epithermal mineral... more The paper provides the first data on lead isotopic composition of porphyry and epithermal mineralization of the Birgilda-Tomino ore cluster. Lead isotope characteristics were obtained for 24 sulfide samples representing epithermal Au-Ag (Bereznyakovskoe ore field and Michurino occurrence), base-metal carbonate replacement (Biksizak occurrence), porphyry copper (Tomino, Kalinovskoe, and Birgilda deposits), and four plagioclase samples of the Birgilda-Tomino Igneous Complex. Ore samples have lead isotopic signatures similar to neighboring intrusions of the Birgilda-Tomino igneous complex and this confirms genetic relations between epithermal Au-Ag, base-metal carbonate replacement and porphyry copper mineralization with diorite porphyry intrusions. Variations in lead isotopic composition are caused by mixing of mantle and crustal lead sources. The input of radiogenic 206Pb took place during the post-ore phase as a result of a series of tectono-magmatic events, which include emplacement of at least two phases of the Chelyabinsk pluton. The latter however could act only as a trigger of hydrothermal activity but not as a lead source.

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Most of the Cu (±Mo,Au) porphyry and porphyry-related deposits of the Urals are located in the Ta... more Most of the Cu (±Mo,Au) porphyry and porphyry-related deposits of the Urals are located in the Tagil-Magnitogorsk, East-Uralian Volcanic and Trans-Uralian volcanic arc megaterranes. They are related to subduction zones of different ages:
(1) Silurian westward subduction: Cu-porphyry deposits of the Birgilda-Tomino ore cluster (Birgilda, Tomino, and Kalinovskoe) and the Zeleny Dol Cu-porphyry deposit;
(2) Devonian Magnitogorsk eastward subduction and the subsequent collision with the East European plate: deposits and occurrences are located in the Tagil (skarn-porphyry Gumeshevskoe etc.) and Magnitogorsk terranes (Cu-porphyry Salavat and Voznesenskoe, Mo-porphyry Verkhne-Uralskoe, Au-porphyry Yubileinoe etc.), and probably in the Alapaevsk-Techa terrane (occurrences of the Alapayevsk-Sukhoy Log cluster);
(3) Late-Devonian to Carboniferous subduction: deposits located in the Trans-Uralian megaterrane. This includes Late-Devonian to Early Carboniferous Mikheevskoe Cu-porphyry and Tarutino Cu skarn-porphyry, Carboniferous deposits of the Alexandrov volcanic arc terrane (Bataly, Varvarinskoe) and Early Carboniferous deposits formed dew to eastward subduction under the Kazakh continent (Benkala, etc.).
(4) Continent-continent collision in Late Carboniferous produced the Talitsa Mo-porphyry deposit located in the East Uralian megaterrane.
Porphyry mineralization of the Magnitogorsk megaterrane shows an evolving relationship from gabbro-diorite and quartz diorite in the Middle Devonian (Gumeshevskoe, Salavat, Voznesenskoe) to granodiorite-plagiogranodiorite in the Late Devonian (Yubileinoe Au-porphyry) and finally to granodiorite in the Carboniferous (Talitsa Mo-porphyry) with a progressive increase in total REE, Rb and Sr contents. This corresponds to the evolution of the Magnitogorsk terrane from a volcanic arc which gave place to an arc-continent collision in the Famennian.

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We describe two epithermal telluride-selenide bearing Au-Ag deposits: Prasolovskoe and Ozernovsko... more We describe two epithermal telluride-selenide bearing Au-Ag deposits: Prasolovskoe and Ozernovskoe, both located within the Kuril-Kamchatka volcano-plutonic belt. Several rare and unknown Te and Se minerals were found at both deposits. At the Prasolovskoe deposit, various Te-Se minerals, including an unnamed Te3Se4 phase are widespread, while at the Ozernovskoe deposit selenides and sulfoselenides are typical. Te-Se mineralization at both deposits

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Geology of Ore Deposits, 2015

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Mineral deposit research for a high-tech world. Proceedings of the 12th Biennial SGA Meeting, 12–15 August 2013, Uppsala. Sweden. SGA: Uppsala, 2013. V. 4. P. 1516–1518.

Most of porphyry deposits are located in the South and Middle segments of the Urals. They are con... more Most of porphyry deposits are located in the South and Middle segments of the Urals. They are confined to three main N-S trending volcanic belts, i.e. the Tagyl−Magnitogorsk (Salavat, Yubileynoe, Voznesenskoe etc.), East-Uralian (Birgilda-Tomino ore cluster, Mikheevskoe etc) and Valerianovka (Benkala, Batala, etc.) megazones. Usually they are genetically linked with subduction-related calc-alkaline low K intrusions.

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Geology of Ore Deposits, 2003, V. 45(3), p. 171–200.

The Late Paleozoic Kairagach epithermal gold deposit belongs to the high-sulfidation (acid–sulfat... more The Late Paleozoic Kairagach epithermal gold deposit belongs to the high-sulfidation (acid–sulfate) type. It is located at the northern slope of the Kuramin Ridge in the central Tien Shan, 3.5 km northwest of the Kochbulak deposit, being confined to the volcanic andesite–dacite sequence (C2–3) composing the northeastern segment of the Karatash caldera. Volcanogenic sequences are intruded by subvolcanic dacite–porphyry and diorite–porphyry intrusions, as well as granodiorite–porphyry and porphyritic diabase dikes of the northeastern strike. The gold–sulfide–selenide–telluride mineralization of the Diabazovaya zone, which encloses the main gold resources, associates with these dikes. Unlike typical epithermal deposits of the high-sulfidation type with Au–Cu geochemical specialization of ores, the Kairagach deposit is characterized by distinct Au–Sn–Bi–Se–Te mineralization, which includes over 80 ore minerals, including new and rare ones. This paper discusses data on the geological structure of the deposit, ore geochemistry, variations in chemical composition, mode of occurrence and parageneses of native elements (Au, Ag, Te, Sn, Bi); sulfides of Fe, Cu, Pb, Zn, and Ag; fahlores of the tetrahedrite–tennantite–annivite–goldfieldite series; bismuthinite–aikinite, junoite, and pavonite sulfosalts; Cu and Fe sulfostannate; various Au, Ag, Pb, Fe, Hg, Bi, and Sb tellurides and Bi sulfoselenides; and Fe and Sn oxides. The chemical composition of ordinary, high-grade, and bonanza ores and the vertical and lateral (including hidden) mineralization zoning, as well as the succession of mineral parageneses, P–T parameters, composition of mineral-forming fluids, and main factors and mechanisms responsible for the formation of goldproductive mineral associations, are considered. The variations in the S, C, O, and H compositions of ore minerals are used to define probable sources of water and ore components in ore-forming fluids. The results of thermodynamic modeling of probable gold occurrence and transportation in the mineral-forming solution are also discussed.

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Geology of Ore Deposits 04/2015; 57(2). P. 118-132.

The distribution of Re in ores of the Mikheevskoe Mo--Cu deposit in the South Urals has been stud... more The distribution of Re in ores of the Mikheevskoe Mo--Cu deposit in the South Urals has been studied. It has been established that the Re grade in ores usually is does not exceed 0.5 g/t. The positive correlation between concentrations of Re and Mo (correlation coefficient 0.94), as well as between Re and Cu (correlation coefficient 0.52) have been revealed. EMPA of individual flakes of molybdenite has shown that the content of Re higher than detection limit was measured in the most flakes studied and as rule as high as 0.4-0.5 wt %, but occasionally it reaches 1.34 wt %. Re within flakes of molybdenite is distributed irregularly. Patchy/dotted/, linear, and concentric-zoned distribution patterns of zones with elevated content of Re (usually 0.5-1 wt % Re, sometimes higher) were found against the lower content (up to 0.2 wt % Re) that is regular distributed within the flake. The later hydrothermal processes and mechanical deformation of flakes resulted in epigenetic redistribution of Re in molybdenite that lead to homogenization of molybdenite composition and smoothing of the primary pattern, or to removal of Re from molybdenite.

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Geology of Ore Deposits 01/2015; 57(1):64-84.

The Kopylovsky and Kavkaz gold deposits in the Artemovskiy ore cluster, Bodaybo district, hosted ... more The Kopylovsky and Kavkaz gold deposits in the Artemovskiy ore cluster, Bodaybo district, hosted in terrigenous carbonaceous sequence of the Dogaldyn formation of the Upper Proterozoic Bodaybo group, are localized in cores of high-order anticlines. These deposits contain gold–sulfide and gold–sulfide–quartz ore types. Pyrite is the predominant ore mineral; copper, zinc, nickel, and cobalt sulfides are minor. Native gold is found as free grains, and inclusions and ultrafine stingers in pyrite. A few morphological varieties of pyrite are identified: (1) framboidal and fine-grained pyrite resulting from sedimentation and diagenesis; (2) fine-grained subhedral to euhedral pyrite corresponding to catagenesis, metamorphism, and dynamometamorphism; and (3) coarse-crystalline euhedral gold-free pyrite occurring in the host rocks beyond ore bodies and deposits. According to electron microprobe and LA–ICP–MS data, the contents of Au, Ag, Co, Pb, Sb, Bi, Ba, Mo, and Tl decrease from sedimentary–diagenetic to metamorphic pyrite, while Ni, Cu, As, Se and especially U contents increase in the same direction. Primary gold is suggested to have accumulated during sedimentation as species associated with carbonaceous matter and cogenetic pyrite and redeposited as a result of catagenesis and metamorphism as native species with crystallization of the latest pyrite and associated sulfides of base metals.

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Geology of Ore Deposits 02/2015; 57(1). P. 42-63

Variations in the chemical composition of fahlores at the Biksizak occurrence, Birgilda-Tomino or... more Variations in the chemical composition of fahlores at the Biksizak occurrence, Birgilda-Tomino ore cluster, South Urals has been studied. Carbonate replacement base-metal mineralization is related to the Paleozoic porphyry-epithermal system. The composition of fahlores ranges from Fe-rich tennantite to Zn-rich tetrahedrite with variable content of Ag. The grains of fahlores are complexly zoned with progressively increased concentration of Sb and Ag with time. Strong positive correlation between Sb and Ag has been established. On a Ag/(Ag+Cu) versus Sb/(Sb+As) diagram, the compositions of fahlores are fitted by lines with individual slope for each sample. The slope of lines corresponding to the samples from the East location located close to the intrusion of porphyry diorite that is the center of porphyry-epithermal system is the lowest, whereas that corresponding to the samples from the West location more than one km distant of the center is the highest. It is shown that the composition of fahlores and its evolution could be used as important exploration guide of porphyry-epithermal ore-forming systems.

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Romanian journal of mineral deposits. 2014. V. 87(1). P. 87−90.

The paper describes sphalerite composition (Fe, Mn, and Cd contents) from five epithermal base-me... more The paper describes sphalerite composition (Fe, Mn, and Cd contents) from five epithermal base-metal deposits of the Baia Mare district: Nistru, Herja, Baia Sprie, Cavnic, and Cisma. Sphalerite is usually featured by X FeS decrease with lowering temperature and sulfur fugacity.

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DOI: 10.1111/1755-6724.12370_2

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Acta Geologica Sinica (English Edition). 2014. V. 88. Supp. 2. P. 584-586.

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Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass sp... more Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass spectrometry data from molybdenite within two porphyry copper deposits (Kalinovskoe and Birgilda) of the Birgilda-Tomino ore cluster (South Urals) are presented. † The results provide evidence that molybdenites from these two sites have similar trace-element chemistry. Most trace elements (Si, Fe, Co, Cu, Zn, Ag, Sb, Te, Pb, Bi, Au, As and Se) form mineral inclusions within molybdenite. The Re contents in molybdenite vary from 8.7 ppm to 1.13 wt.%. The Re distribution within single molybdenite flakes is always extremely heterogeneous. It is argued that a temperature decrease favours the formation of Re-rich molybdenite. The high Re content of molybdenite observed points to a mantle-derived source.

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Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass sp... more Mineralogical, electron microprobe analysis and laser ablation-inductively coupled plasma-mass spectrometry data from molybdenite within two porphyry copper deposits (Kalinovskoe and Birgilda) of the Birgilda-Tomino ore cluster (South Urals) are presented. The results provide evidence that molybdenites from these two sites have similar trace-element chemistry. Most trace elements (Si, Fe, Co, Cu, Zn, Ag, Sb, Te, Pb, Bi, Au, As and Se) form mineral inclusions within molybdenite. The Re contents in molybdenite vary from 8.7 ppm to 1.13 wt.%. The Re distribution within single molybdenite flakes is always extremely heterogeneous. It is argued that a temperature decrease favours the formation of Re-rich molybdenite. The high Re content of molybdenite observed points to a mantle-derived source.

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Mineral assemblages and formation conditions of precious metals (Au, Ag, PGE) in ores of the Mikh... more Mineral assemblages and formation conditions of precious metals (Au, Ag, PGE) in ores of the Mikheevskoe porphyry copper deposit (South Urals) are the subject of our study. Three mineralization types can be distinguished:
(1) Gold-silver-telluride mineralization overlapping porphyry-style bornite-chalcopyrite ores includes
native gold (fineness 863–873), electrum (fineness 593–672), galena, hessite, coloradoite, and, more rarely, petzite, stützite, Au-Ag ditellurides, native tellurium, tellurobismuthite, tetradymite–kawazulite, altaite, and extremely rare melonite NiTe2, merenskyite PdTe2, and sopcheite Ag4Pd3Te4;
(2) Gold-arsenopyrite-basemetal mineralization within quartz-tetrahedrite-sphalerite veinlets cutting porphyry-style mineralization;
(3) Gold-telluride mineralization with argillic alteration and mineralogically similar to that of type (1) but distinct because of the presence of Au-Ag, Ag, and Pb selenides.
Textural relationships supported by fluid inclusions data and chlorite geothermometry provide evidence that occurrence of precious metals minerals at the Mikheevskoe deposit is mostly linked to epithermal overprint of the porphyry mineralization and was deposited at ca. 300–200 °C from moderately saline fluids (ca. 5–10 wt%-eq.NaCl). It is suggested that the observed variability in
Au and Ag minerals results from small fluctuations of S2 and/or Te2 fugacity.

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The paper presents new geochronological and isotopic geochemical data on gold mineralization of t... more The paper presents new geochronological and isotopic geochemical data on gold mineralization of the Kedrovskoe deposit. The deposit is located in the northeastern part of the Transbaikal metallogenic province, Russia's largest. The Early Permian age (273 ± 4 Ma) of mineralization based on the results of Rb– Sr study of metasomatic rocks is correlated with the age of the final phases of Hercynian magmatism in the Baikal–Muya Foldbelt. The Sr, Nd, and Pb isotopic geochemical characteristics of mineralization show that the host rocks are involved in the formation of the latter. It has been established that ore lead was supplied to the hydrothermal system of the deposit mainly from a geochemical reservoir represented by the Neoprotero-zoic juvenile continental crust of the Baikal–Muya Foldbelt.

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“Magmatism of the Earth and related strategic metal deposits”. Proceedings of XXXIV International Conference. Miass, 4-9 August 2017, 2017

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The Urals can be regarded as a significant Cu-Mo-porphyry province, hosting over 30 porphyry depo... more The Urals can be regarded as a significant Cu-Mo-porphyry province, hosting over 30 porphyry deposits. Although their geological structure and ore-forming processes have been studied in great detail, uncertainty remains about their age and related geotectonic setting. In this contribution we report for the first time the Re-Os dating of molybdenites from three Cu-Mo porphyry deposits, namely Kalinovskoe, Mikheevskoe and Talitsa. Three molybdenite samples from the Kalinovskoe deposit yield Silurian Re-Os ages ranging from 427.1 Ma to 431.7 Ma (mean 429.8 ± 4.8 Ma; 2σ standard deviation), and a Re–Os isochron age of 430.7 ± 1.3 Ma (MSWD = 0.63), which coincides with previous U-Pb zircon dating of ore-hosting diorites from the same ore field (427 ± 6 Ma). The molybdenite from the Mikheevskoe deposit gives Re-Os ages of 357.8 ± 1.8 Ma and 356.1 ± 1.4 Ma (mean 357.0 ± 2.4 Ma; Carboniferous/Tournaisian), which corresponds to previous U-Pb dating of zircons from the diorite hosting porphyry deposit (356 ± 6 Ma). The molybdenite from Talitsa Mo-porphyry deposit yields the youngest Re-Os ages of 298.3 ± 1.3 and 299.9 ± 2.9 Ma (mean 299.1 ± 2.3 Ma) at Carboniferous-Permian boundary. Thus, the studied Cu and Mo porphyry deposits are not synchronous and belong to distinct tectonic events of the Urals.

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The paper provides the first data on lead isotopic composition of porphyry and epithermal mineral... more The paper provides the first data on lead isotopic composition of porphyry and epithermal mineralization of the Birgilda-Tomino ore cluster. Lead isotope characteristics were obtained for 24 sulfide samples representing epithermal Au-Ag (Bereznyakovskoe ore field and Michurino occurrence), base-metal carbonate replacement (Biksizak occurrence), porphyry copper (Tomino, Kalinovskoe, and Birgilda deposits), and four plagioclase samples of the Birgilda-Tomino Igneous Complex. Ore samples have lead isotopic signatures similar to neighboring intrusions of the Birgilda-Tomino igneous complex and this confirms genetic relations between epithermal Au-Ag, base-metal carbonate replacement and porphyry copper mineralization with diorite porphyry intrusions. Variations in lead isotopic composition are caused by mixing of mantle and crustal lead sources. The input of radiogenic 206Pb took place during the post-ore phase as a result of a series of tectono-magmatic events, which include emplacement of at least two phases of the Chelyabinsk pluton. The latter however could act only as a trigger of hydrothermal activity but not as a lead source.

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Most of the Cu (±Mo,Au) porphyry and porphyry-related deposits of the Urals are located in the Ta... more Most of the Cu (±Mo,Au) porphyry and porphyry-related deposits of the Urals are located in the Tagil-Magnitogorsk, East-Uralian Volcanic and Trans-Uralian volcanic arc megaterranes. They are related to subduction zones of different ages:
(1) Silurian westward subduction: Cu-porphyry deposits of the Birgilda-Tomino ore cluster (Birgilda, Tomino, and Kalinovskoe) and the Zeleny Dol Cu-porphyry deposit;
(2) Devonian Magnitogorsk eastward subduction and the subsequent collision with the East European plate: deposits and occurrences are located in the Tagil (skarn-porphyry Gumeshevskoe etc.) and Magnitogorsk terranes (Cu-porphyry Salavat and Voznesenskoe, Mo-porphyry Verkhne-Uralskoe, Au-porphyry Yubileinoe etc.), and probably in the Alapaevsk-Techa terrane (occurrences of the Alapayevsk-Sukhoy Log cluster);
(3) Late-Devonian to Carboniferous subduction: deposits located in the Trans-Uralian megaterrane. This includes Late-Devonian to Early Carboniferous Mikheevskoe Cu-porphyry and Tarutino Cu skarn-porphyry, Carboniferous deposits of the Alexandrov volcanic arc terrane (Bataly, Varvarinskoe) and Early Carboniferous deposits formed dew to eastward subduction under the Kazakh continent (Benkala, etc.).
(4) Continent-continent collision in Late Carboniferous produced the Talitsa Mo-porphyry deposit located in the East Uralian megaterrane.
Porphyry mineralization of the Magnitogorsk megaterrane shows an evolving relationship from gabbro-diorite and quartz diorite in the Middle Devonian (Gumeshevskoe, Salavat, Voznesenskoe) to granodiorite-plagiogranodiorite in the Late Devonian (Yubileinoe Au-porphyry) and finally to granodiorite in the Carboniferous (Talitsa Mo-porphyry) with a progressive increase in total REE, Rb and Sr contents. This corresponds to the evolution of the Magnitogorsk terrane from a volcanic arc which gave place to an arc-continent collision in the Famennian.

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We describe two epithermal telluride-selenide bearing Au-Ag deposits: Prasolovskoe and Ozernovsko... more We describe two epithermal telluride-selenide bearing Au-Ag deposits: Prasolovskoe and Ozernovskoe, both located within the Kuril-Kamchatka volcano-plutonic belt. Several rare and unknown Te and Se minerals were found at both deposits. At the Prasolovskoe deposit, various Te-Se minerals, including an unnamed Te3Se4 phase are widespread, while at the Ozernovskoe deposit selenides and sulfoselenides are typical. Te-Se mineralization at both deposits

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Geology of Ore Deposits, 2015

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Mineral deposit research for a high-tech world. Proceedings of the 12th Biennial SGA Meeting, 12–15 August 2013, Uppsala. Sweden. SGA: Uppsala, 2013. V. 4. P. 1516–1518.

Most of porphyry deposits are located in the South and Middle segments of the Urals. They are con... more Most of porphyry deposits are located in the South and Middle segments of the Urals. They are confined to three main N-S trending volcanic belts, i.e. the Tagyl−Magnitogorsk (Salavat, Yubileynoe, Voznesenskoe etc.), East-Uralian (Birgilda-Tomino ore cluster, Mikheevskoe etc) and Valerianovka (Benkala, Batala, etc.) megazones. Usually they are genetically linked with subduction-related calc-alkaline low K intrusions.

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Geology of Ore Deposits, 2003, V. 45(3), p. 171–200.

The Late Paleozoic Kairagach epithermal gold deposit belongs to the high-sulfidation (acid–sulfat... more The Late Paleozoic Kairagach epithermal gold deposit belongs to the high-sulfidation (acid–sulfate) type. It is located at the northern slope of the Kuramin Ridge in the central Tien Shan, 3.5 km northwest of the Kochbulak deposit, being confined to the volcanic andesite–dacite sequence (C2–3) composing the northeastern segment of the Karatash caldera. Volcanogenic sequences are intruded by subvolcanic dacite–porphyry and diorite–porphyry intrusions, as well as granodiorite–porphyry and porphyritic diabase dikes of the northeastern strike. The gold–sulfide–selenide–telluride mineralization of the Diabazovaya zone, which encloses the main gold resources, associates with these dikes. Unlike typical epithermal deposits of the high-sulfidation type with Au–Cu geochemical specialization of ores, the Kairagach deposit is characterized by distinct Au–Sn–Bi–Se–Te mineralization, which includes over 80 ore minerals, including new and rare ones. This paper discusses data on the geological structure of the deposit, ore geochemistry, variations in chemical composition, mode of occurrence and parageneses of native elements (Au, Ag, Te, Sn, Bi); sulfides of Fe, Cu, Pb, Zn, and Ag; fahlores of the tetrahedrite–tennantite–annivite–goldfieldite series; bismuthinite–aikinite, junoite, and pavonite sulfosalts; Cu and Fe sulfostannate; various Au, Ag, Pb, Fe, Hg, Bi, and Sb tellurides and Bi sulfoselenides; and Fe and Sn oxides. The chemical composition of ordinary, high-grade, and bonanza ores and the vertical and lateral (including hidden) mineralization zoning, as well as the succession of mineral parageneses, P–T parameters, composition of mineral-forming fluids, and main factors and mechanisms responsible for the formation of goldproductive mineral associations, are considered. The variations in the S, C, O, and H compositions of ore minerals are used to define probable sources of water and ore components in ore-forming fluids. The results of thermodynamic modeling of probable gold occurrence and transportation in the mineral-forming solution are also discussed.

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Geology of Ore Deposits 04/2015; 57(2). P. 118-132.

The distribution of Re in ores of the Mikheevskoe Mo--Cu deposit in the South Urals has been stud... more The distribution of Re in ores of the Mikheevskoe Mo--Cu deposit in the South Urals has been studied. It has been established that the Re grade in ores usually is does not exceed 0.5 g/t. The positive correlation between concentrations of Re and Mo (correlation coefficient 0.94), as well as between Re and Cu (correlation coefficient 0.52) have been revealed. EMPA of individual flakes of molybdenite has shown that the content of Re higher than detection limit was measured in the most flakes studied and as rule as high as 0.4-0.5 wt %, but occasionally it reaches 1.34 wt %. Re within flakes of molybdenite is distributed irregularly. Patchy/dotted/, linear, and concentric-zoned distribution patterns of zones with elevated content of Re (usually 0.5-1 wt % Re, sometimes higher) were found against the lower content (up to 0.2 wt % Re) that is regular distributed within the flake. The later hydrothermal processes and mechanical deformation of flakes resulted in epigenetic redistribution of Re in molybdenite that lead to homogenization of molybdenite composition and smoothing of the primary pattern, or to removal of Re from molybdenite.

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Geology of Ore Deposits 01/2015; 57(1):64-84.

The Kopylovsky and Kavkaz gold deposits in the Artemovskiy ore cluster, Bodaybo district, hosted ... more The Kopylovsky and Kavkaz gold deposits in the Artemovskiy ore cluster, Bodaybo district, hosted in terrigenous carbonaceous sequence of the Dogaldyn formation of the Upper Proterozoic Bodaybo group, are localized in cores of high-order anticlines. These deposits contain gold–sulfide and gold–sulfide–quartz ore types. Pyrite is the predominant ore mineral; copper, zinc, nickel, and cobalt sulfides are minor. Native gold is found as free grains, and inclusions and ultrafine stingers in pyrite. A few morphological varieties of pyrite are identified: (1) framboidal and fine-grained pyrite resulting from sedimentation and diagenesis; (2) fine-grained subhedral to euhedral pyrite corresponding to catagenesis, metamorphism, and dynamometamorphism; and (3) coarse-crystalline euhedral gold-free pyrite occurring in the host rocks beyond ore bodies and deposits. According to electron microprobe and LA–ICP–MS data, the contents of Au, Ag, Co, Pb, Sb, Bi, Ba, Mo, and Tl decrease from sedimentary–diagenetic to metamorphic pyrite, while Ni, Cu, As, Se and especially U contents increase in the same direction. Primary gold is suggested to have accumulated during sedimentation as species associated with carbonaceous matter and cogenetic pyrite and redeposited as a result of catagenesis and metamorphism as native species with crystallization of the latest pyrite and associated sulfides of base metals.

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Geology of Ore Deposits 02/2015; 57(1). P. 42-63

Variations in the chemical composition of fahlores at the Biksizak occurrence, Birgilda-Tomino or... more Variations in the chemical composition of fahlores at the Biksizak occurrence, Birgilda-Tomino ore cluster, South Urals has been studied. Carbonate replacement base-metal mineralization is related to the Paleozoic porphyry-epithermal system. The composition of fahlores ranges from Fe-rich tennantite to Zn-rich tetrahedrite with variable content of Ag. The grains of fahlores are complexly zoned with progressively increased concentration of Sb and Ag with time. Strong positive correlation between Sb and Ag has been established. On a Ag/(Ag+Cu) versus Sb/(Sb+As) diagram, the compositions of fahlores are fitted by lines with individual slope for each sample. The slope of lines corresponding to the samples from the East location located close to the intrusion of porphyry diorite that is the center of porphyry-epithermal system is the lowest, whereas that corresponding to the samples from the West location more than one km distant of the center is the highest. It is shown that the composition of fahlores and its evolution could be used as important exploration guide of porphyry-epithermal ore-forming systems.

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Romanian journal of mineral deposits. 2014. V. 87(1). P. 87−90.

The paper describes sphalerite composition (Fe, Mn, and Cd contents) from five epithermal base-me... more The paper describes sphalerite composition (Fe, Mn, and Cd contents) from five epithermal base-metal deposits of the Baia Mare district: Nistru, Herja, Baia Sprie, Cavnic, and Cisma. Sphalerite is usually featured by X FeS decrease with lowering temperature and sulfur fugacity.

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DOI: 10.1111/1755-6724.12370_2

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Acta Geologica Sinica (English Edition). 2014. V. 88. Supp. 2. P. 584-586.

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