Abstract
The mineral and chemical composition of the carbon-bearing rocks of the Late Permian Pionerskaya Formation containing the Degdekan gold deposit has been studied. The bulk contents of Au, Ag, Pt, and Pd in the black shales and their light, sulfide, and electromagnetic fractions were determined by electrothermal atomization. The mineral composition and the phase analysis of the rocks were studied using a scanning electron microscope. Gold is present as fine xenomorphic grains of high fineness with an Fe admixture of up to 4 at %, as well as intergrowths of kustelite and electrum. The Au and Pt contents in the black shales and ores vary in a wide range (g/t): Au 0.01–13.12, Pt 0.001–1.34. The highest Au contents (up to 1748 g/t) were noted in the sulfide fraction. The Pt-bearing phases were not found, whereas a Pt content of about 0.61 wt % was determined using an electron microscope in a carbonaceous matrix. The initial rocks have a steady and low Pt content (less than 0.007 g/t). A stable even Au distribution in the studied rocks was established within 1.14–2.46 g/t. The chemical analysis of the soluble fraction of the carbonaceous matter extracted from the black shales showed the presence of Au 0.375, Ag 3.68, Pt 0.147, and Pd 0.052 g/t. It has been concluded that the carbon-bearing rocks of the Pionerskaya Formation play a resource role in the accumulation of noble metals, whereas economic concentrations of the latters are formed in the course of the superimposed metamorphic-hydrothermal processes.
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References
V. V. Akinin, A. V. Prokop'ev, J. Yu. Toro, et al., “U-Pb SHRIMP Ages of Granitoids from the Main Batholith Belt (North East Asia),” Dokl. Akad. Nauk 426(2), 216–221 (2009) [Dokl. Earth Sci. 426, 605–610 (2009)].
Ch. Kh. Arifulov, “Gold Potential of the Black-Shale Sequences and Settings of Ore Body Formation,” Rudy Met., No. 1, 10–21 (2010).
A. S. Astakhov, N. A. Goryachev, and T. I. Mikhalitsyna, “Conditions of the Formation of Gold-Enriched Horizons of Ore-Hosting Black Shale Sequences (Illustrated by Permian and Recent Marine Sediments of Northeastern Asia),” Dokl. Akad. Nauk 430(2), 212–217 (2010) [Dokl. Earth Sci. 430, 9–14 (2010)].
L. G. Berry, B. Mason, and R. V. Dietrich, Mineralogy: Concepts, Descriptions, and Determinations (Freeman, San Francisco, 1983; Mir, Moscow, 1987).
V. A. Buryak, B. K. Mikhailov, and N. V. Tsymbalyuk, “Genesis, Regular Distribution, and Gold and PGE Potential of Black Shales,” Rudy Met., No. 6, 25–36 (2002).
V. I. Goncharov, S. V. Voroshin, and A. S. Sidorov, The Natalka Gold Deposit (SVKNII, Magadan, 2002) [in Russian].
I. S. Gramberg, I. N. Goryainov, and A. S. Smekalov, “Limit of Platinum Solubility in Ocean Water in Relation to the Problem of Abyssal Placer Formation,” Dokl. Akad. Nauk 349(3), 378–380 (1996) [Dokl. Earth Sci. 349, 966–969 (1996)].
N. P. Ermolaev and N. A. Sozinov, Stratiform Ore Formation in Black Shales (Nauka, Moscow, 1986) [in Russian].
I. S. Litvinenko, “The Conditions of Existence and Typomorphism of Native Gold in Ores of the Degdekanskoe Deposit in Black-Shale Strata,” Geol. Geofiz. 50(6), 691–697 (2009).
B. K. Mikhailov, S. F. Struzhkov, M. V. Natalenko, and N. V. Tsymbalyuk, “Multifactor Model of Large-Volume Degdekan Deposit (Magadan Region),” Otechestvennaya Geol., No. 2, 20–31 (2010).
L. P. Plyusnina, A. I. Khanchuk, V. I. Goncharov, et al., “Gold, Platinum, and Palladium in Ores of the Natalka Deposit, Upper Kolyma Region,” Dokl. Akad. Nauk 391(3), 383–387 (2003) [Dokl. Earth Sci. 391, 836–840 (2003)].
A. I. Khanchuk and V. V. Ivanov, “Meso-Cenozoic Geodynamic Settings and Gold Mineralization of the Russian Far East,” Geol. Geofiz. 40(11), 1635–1645 (1999).
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Original Russian Text © A.I. Khanchuk, L.P. Plyusnina, E.M. Nikitenko, T.V. Kuzmina, N.N. Barinov, 2011, published in Tikhookeanskaya Geologiya, 2011, Vol. 30, No. 2, pp. 3–11.
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Khanchuk, A.I., Plyusnina, L.P., Nikitenko, E.M. et al. The noble metal distribution in the black shales of the Degdekan gold deposit in Northeast Russia. Russ. J. of Pac. Geol. 5, 89–96 (2011). https://doi.org/10.1134/S1819714011020059
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DOI: https://doi.org/10.1134/S1819714011020059