Typomorphic Characteristics of Molybdenite from the Bystrinsky Cu–Au Porphyry–Skarn Deposit, Eastern Transbaikal Region, Russia

Коваленкер, В. А.; Trubkin, N. V.; Абрамова, В. Д.; Plotinskaya, O. Yu.; Kiseleva, G. D.; Borisovskii, S. E.; Yazykova, Yu. I.

doi:10.1134/s107570151801004x

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…from 302 to 4540 ppm in sample K-3/112.7, or from <10 to >1000 ppm in sample K-2210/73.4 (Table 4). The irregular distribution of Re in molybdenites from deposits of various genetic types has been identified by EMPA (Kovalenker et al ., 1974; Voudouris et al ., 2009; Maksimyuk and Kulikova, 2013; Rathkopf et al ., 2017), by LA-ICP-MS (Ciobanu et al ., 2013; Bogdanov and Krumov, 2016; Kovalenker et al ., 2018, etc. ), and by NanoSIMS (Barra et al , 2017).…”

Section: Discussionmentioning

confidence: 99%

Trace-element geochemistry of molybdenite from porphyry Cu deposits of the Birgilda-Tomino ore cluster (South Urals, Russia)

et al. 2018

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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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Section: Discussionmentioning

confidence: 99%

Trace-element geochemistry of molybdenite from porphyry Cu deposits of the Birgilda-Tomino ore cluster (South Urals, Russia)

et al. 2018

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“…One may suppose that in some cases the 3 R polytype bands were thinner than the EBSD step size (0.25 to 1.5 µm) and were missed during mapping. For example, a transmission electron microscopy study by Kovalenker et al (2018) identified nanometre-sized interlayers of 3 R polytype in 2 H molybdenite. Some ‘noise’ in areas 4 and 5 of site 3 (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…This makes the study of both structural and chemical heterogeneity of molybdenite extremely important. Heterogeneous distribution of rhenium, and, sometimes, tungsten and selenium in molybdenite have been identified by electron microprobe analysis (EMPA) (Kovalenker et al ., 1974; Prokof'ev et al ., 2007; Voudouris et al ., 2009, 2019; Grabezhev and Shagalov, 2010; Grabezhev, 2013; Grabezhev and Voudouris, 2013; Kalinin et al ., 2013; Maksimyuk and Kulikova, 2013; Grabezhev and Hiller, 2015; Plotinskaya et al ., 2015, 2018 a ; Rathkopf et al ., 2017; McFall et al ., 2019), by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) (Aleinikoff et al ., 2012; Ciobanu et al ., 2013; Bogdanov and Krumov, 2016; Kovalenker et al ., 2018, Plotinskaya et al ., 2018 a ), and by nanoscale secondary ion mass spectrometry (NanoSIMS) (Barra et al , 2017).…”

Section: Introductionmentioning

confidence: 99%

Grain-scale distribution of molybdenite polytypes versus rhenium contents: μXRD and EBSD data

Plotinskaya

Shilovskikh

Najorka

et al. 2019

MinMag

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Molybdenite from two porphyry copper mineralisation sites within the South Urals was studied by electron microprobe (EMPA), micro x-ray diffraction (μXRD) and electron backscattered diffraction (EBSD) methods. Elevated contents of rhenium (0.2 to 0.4, sometimes up to 1.1 wt.%) form linear zones from several to tens of micrometres wide and up to hundreds of micrometres long parallel to the elongation of molybdenite flakes. In most cases Re-rich zones are composed of the rhombohedral (3R) polytype of molybdenite, while the rest of the molybdenite flakes with ca. 0.1 wt.% of Re consist of hexagonal (2H) molybdenite. In rare cases Re-rich zones are confined to grain boundaries of molybdenite-2H. It is shown that both μXRD and EBSD are the most appropriate tools to distinguish different polytypes within a single grain of molybdenite.

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“…The Bystrinsky massif is composed of the large stock of the first phase (granodiorites, monzonites and diorites) and relatively small stock-like bodies of the second phase of the Shakhtama complex (granodiorite-, diorite-, monzonite-porphyries), with which the formation of ore mineralization is associated [17,18]. We studied both the magmatic rocks of the first phase those of the second phase of the Shakhtama complex.…”

Section: The Bystrinsky Depositmentioning

confidence: 99%

Rock-Forming (Biotite and Plagioclase) and Accessory (Zircon) Minerals Geochemistry as an Indicator of the Metal Fertility of Magmas by the Example of Au-Cu-Fe-Skarn Deposits in Eastern Transbaikalia

et al. 2021

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Many gold and gold-bearing complex deposits related to the Late Jurassic and Early Cretaceous magmatism are known in Eastern Transbaikalia. The largest deposits are the Lugokan, the Kultuma and the Bystrinsky. These deposits are in a paragenetic relationship with the Late Jurassic magmatic rocks of the Shakhtama complex. According to the available data, the total resources of gold in these three deposits are estimated to be approximately 443 tons: the Lugokan, Au~53 tons, Cu~302 thousand tons; the Kultuma, Au~121 tons, Cu~587 thousand tons, Fe~33 mln t; the Bystrinsky, Au~269 tons, Cu~2070 thousand tons, Fe~67 mln t. One of the main aims of this work was to reveal the criteria of fertility for the classical porphyry type, based on the specific geochemical features of rock-forming and accessory minerals. A comparison of the obtained results with other data on the large porphyry and skarn deposits of the world showed that the magmatic rocks of the Bystrinsky massif, specifically porphyry species dated 159.6–158.6 Ma, are potentially ore-bearing for the porphyry type mineralization. The magmatic rocks that widely occur at the Lugokan and Kultuma deposits are most close to the Fe-skarn deposits. The best indicators of the magma fertility for the porphyry rocks are Ce/Ce*, Eu/Eu*, Yb/Dy, (Ce/Nd)/Y in zircons. Thus, magmatic rocks characterized by Ce/Ce* > 100, Eu/Eu* > 0.4, Yb/Dy > 5.0 and (Ce/Nd)/Y > 0.01 may be classified as high fertile for the classical porphyry mineralization in Eastern Transbaikalia. The plagioclase and biotite chemistry data also showed that the magmatic rocks that occurred at the Bystrinsky deposit are the most fertile for the porphyry type mineralization. The magmatic rocks classified as ore-bearing porphyry type have Al* > 1 in plagioclase, high values of IV(F) and IV(F/Cl) and low ratios of X(F)/X(OH) in biotites. The assessment of the metal fertility of magmatic rocks is most effective in combination with data on both the composition of rock-forming and accessory minerals. The obtained data may be used to develop the methods of prediction and search for gold, copper and iron mineralization.

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Typomorphic Characteristics of Molybdenite from the Bystrinsky Cu–Au Porphyry–Skarn Deposit, Eastern Transbaikal Region, Russia

Cited by 10 publications

References 24 publications

Trace-element geochemistry of molybdenite from porphyry Cu deposits of the Birgilda-Tomino ore cluster (South Urals, Russia)

Trace-element geochemistry of molybdenite from porphyry Cu deposits of the Birgilda-Tomino ore cluster (South Urals, Russia)

Grain-scale distribution of molybdenite polytypes versus rhenium contents: μXRD and EBSD data

Rock-Forming (Biotite and Plagioclase) and Accessory (Zircon) Minerals Geochemistry as an Indicator of the Metal Fertility of Magmas by the Example of Au-Cu-Fe-Skarn Deposits in Eastern Transbaikalia

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