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Chemical evolution of pyrite at the Kopylovsky and Kavkaz black shale-hosted gold deposits, Bodaybo district, Russia: Evidence from EPMA and LA-ICP-MS data

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Abstract

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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Authors and Affiliations

  1. Institute of Mineralogy, Ural Branch, Russian Academy of Sciences, Ilmeny Reservation, Miass, Chelyabinsk oblast, 456317, Russia

    E. E. Palenova, E. V. Belogub, K. A. Novoselov, V. V. Maslennikov, V. A. Kotlyarov & I. A. Blinov

  2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetny per. 35, Moscow, 119017, Russia

    O. Yu. Plotinskaya & I. G. Griboedova

  3. Vostochny bazis LLC, ul. Sibirsky trakt, 12, bld. 1, Yekaterinburg, 620100, Russia

    A. A. Kuzmenko

Authors
  1. E. E. Palenova
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  2. E. V. Belogub
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  3. O. Yu. Plotinskaya
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  4. K. A. Novoselov
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  5. V. V. Maslennikov
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  6. V. A. Kotlyarov
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  7. I. A. Blinov
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  8. A. A. Kuzmenko
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  9. I. G. Griboedova
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Correspondence to E. E. Palenova.

Additional information

Original Russian Text © E.E. Palenova, E.V. Belogub, O.Yu. Plotinskaya, K.A. Novoselov, V.V. Maslennikov, V.A. Kotlyarov, I.A. Blinov, A.A. Kuzmenko, I.G. Griboedova, 2015, published in Geologiya Rudnykh Mestorozhdenii, 2015, Vol. 57, No. 1, pp. 71–92.

This paper is adapted from a presentation at the Third Youth School at the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences 02–06.12.2013.

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Palenova, E.E., Belogub, E.V., Plotinskaya, O.Y. et al. Chemical evolution of pyrite at the Kopylovsky and Kavkaz black shale-hosted gold deposits, Bodaybo district, Russia: Evidence from EPMA and LA-ICP-MS data. Geol. Ore Deposits 57, 64–84 (2015). https://doi.org/10.1134/S107570151501002X

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