ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2018. Vol. 26

Petrogeochemical Features of PGE-Bearing Metapicrites from Kulibinsky Potential Ore Territory (East Sayan)

N. A. Babintsev, A. I. Chernyshov

The objects of the study are mafic-ultramafic complexes of Kulibinsk potential ore unit, including intrusive bodies of kingashsk complex and metavolcanic rocks of kuliginskaya and kuzinskaya series; studied objects are located at the north-west edge of Kansk greenstone belt in East Sayan. The relevance of the study is due to the appearance of new data on geological formations of the Kansk Greenstone Belt, which are the object of extensive discussions. Studied Kulibinst potential ore unit (POT) is a north-west part of Kansk greenstone belt. Its territory is composed of rocks from volcanic-sedimentary complexes, which are composed of orthoamfibolites, orthogneisses, and different metasedimentary rocks with mineral associations of epidote-amphybolic and amphybolic facies of metamorphism. Metavolcanic strata intruded with mafic-ultramafic bodies of magmatic kingash and restitic idarsk complexes. Based on the results of the study, it was established that prospects of the territory associated with low-sulfidic type of PGE (platinum-group elements) mineralization, which founded in mafic-ultramafic bodies of kingashsk dunite-verlite-picritic magmatic complex. The nature of the geochemical zonality and the position of platinum-mineralization are typical for known magmatic platinum-metal deposits in stratified mafic-ultramafic complexes, which were formed during the differentiation of the initial high-magnesian picritic melt in repeatedly occurring intermediate magmatic chambers. In the productive part of the ore-bearing bodies of metapicrites, the magnesia concentration is gradually growing down the section, which is reflected in the change of the mineral composition. At the top of the bodies, these rocks are close in chemical and mineral composition to picritic basalts, and in the bottom – to hi-Mg olivine picrites. The rocks of Kulibinsk POT are characterized by an increase of Pd concentrations with a decrease of MgO and an increase in the TiO2 content in rocks, but within the PGE-bearing picritic strata, an inverse regularity is observed: downward along the section MgO grows together with an increase in the concentrations of palladium. A direct correlation between the Cu and Pd concentrations is typical for all rocks, correlation between the Ni and Pd contents is not so clear and is noted only in the late differentiates. The criteria for the separation of productive horizons is the predominance of copper sulphides in the sulfide phase of the bottom parts from the picritic strata. Numerous dykes of plagiogranites, penetrating the productive strata of the Kulibinsky distribution substation, have a significant effect on the redistribution of Pd. In the exocontact parts of such dikes, there is an increase in the concentration of PGE. In some cases, metasomatites are formed on contacts with plagiogranites, containing ore sulphide-oxide mineralization up to 50 %. By the set of signs, PGE-metal deposits of Portimo complex (Finland) proposed as the object-analogue.

About the Authors

Babintsev Nikita Anatolyevich, Senior Geologist, Laboratory of Geochemical Methods, Krasnoyarsk Research Institute of Geology and Mineral Resourses, 55, Mir av., Krasnoyarsk, 660049, Russian Federation, Postgraduate, Departament of Petrography, National Research Tomsk State University, 36, Lenin av., Tomsk, 634050, Russian Federation, e-mail: mas9915@mail.ru, tel.: (3822)52-94-45 

Chernyshov Aleksey Ivanovich, Doctor of Sciences (Geology and Mineralogy), Professor, Head Petrography Departament, National Research Tomsk State University, 36, Lenin av., Tomsk, 634050, Russian Federation, e-mail: aich@ggf.tsu.ru, tel.: (3822)52-94-45

For citation

Babintsev N.A. Chernyshov A.I. Petrogeochemical Features of PGE-Bearing Metapicrites from Kulibinsky Potential Ore Territory (East Sayan). The Bulletin of Irkutsk State University. Series Earth Sciences, 2018, vol. 26, pp. 3-17. https://doi.org/10.26516/2073-3402.2018.26.3 (in Russian)

ultramafites, picrite, platinum, palladium, PGE, low-sulfidic PGE deposits, greenstone belt

Gertner I.F., Vrublevskii V.V., Glazunov O.M., Tishin P.A., Krasnova T.S., Voitenko D.N. Age and source material of the Kingash ultramafic-mafic massif, east sayan. Doklady earth sciences, 2009, vol. 429, no. 2, pp. 1526-1532. https://doi.org/10.1134/S1028334X09090244

Gavrielenko B.V. Minerageniya blagorodnikh metallov I almazov severo-vostochnoy chasti Baltiiskogo shchita [Minerageny of noble metals and diamonds of north-east part of Baltic shield]. Thesis of diss. for the degree of doc. of geol.-min. sc. Apatites, 2003, 399 p. (in Russian)

Radomskaya T.A., Glazunov O.M., Vlasova V.N., Suvorova L.F. Geochemistry and mineralogy of platinum group element in ores of the Kingash deposit, Eastern Sayan, Russia. Geology of ore deposits, 2017, vol. 59, no. 5, pp. 354-374. https://doi.org/10.1134/S107570151705004X (in Russian)

Glazunov O.M., Bognibov V.I., Ekhanin A.G. Kingashskoe platino-medno-nikelevoe mestorojdenie [Kingash platinum-copper-nickel deposit]. Irkutsk, 2003, 192 p. (in Russian)

Komatiiti I visokomagnezialnie vulkaniti rannego dokembriya (Precambrian comatiites and high-magnesian volcanites of Baltic shield). Leningrad, Nauka Publ, 1988, 192 p. (in Russian)

Radomskaya T.A. Mineralogy and geochemistry of Kingash platinum-copper-nickel deposit (E. Sayan), diss. for the degree of candidate of geol.-min. sc. Irkutsk, 2012, 206 p.

Rassloyennye intruzii Monchegorskogo rudnogo rayona: petroligiya, orudenenie, izotopia, glubinnoe stroenie [Layered intrusions of Monchegorsk ore region: petrology, ore-potention, isotopia, deep structure], in 2 vol. By the red. of Ph.P. Mitrophanov, V.Ph. Smolkin. Apatites, Kolsk science centre of RAS, 2004, 344 p. (in Russian)

Nozhkin A.D., Turkina O.M., Bibikova E.V., Ponomarchuk V.A. Sostav, stroenie I usloviya formirovaniya metaosadochno-vulkanogennikh kompleksov Kanskogo zelenokamennogo poyasa (Severo-Zapadnoe Prisayanie) [Constitution, structure and conditions of forming metasedimentary-volcanic complexes of Kansk greenstone belt (North-West Sayan)]. Geology and geophysics, 2001, vol. 42, no. 7, pp. 1058-1078. (in Russian)

Chernyshov A.I., Babintsev N.A., Voroshilov V.G. Petrografical and mineralogical features of ultramafits from Kirelsk frahment of Kansk greenstone belt (NW of the East Sayan). Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2017, vol. 328, no. 1, pp. 75-88. (in Russian)

Andersen J.C.O., Power M.R., Momme P. Platinum-Group Elements in the Paleogene North Atlantic Igneous Province. The Geology, Geochemistry, Mineralogy and Mineral Beneficiation of Platinum-Group Elements. 2002, vol. 54, pp. 637-667.

Barnes S.-J., Naldrett A.J., Gorton M.P. The origin of the fractionation of platinum-group elements in terrestrial magmas. Chemical geology, 1985, vol. 53, pp. 303-323.

Barrie C.T., Naldrett A.J. The geology and tectonic setting of the Montcalm Gabbroic Complex and Ni-Cu deposit, Western Abitibi Subprovince, Ontario, Canada. Proc. of the 5th Magmatic Sulfides Conference. Harare, Zimbabwe, Special Publication Institution of Mining and Metallurgy, 1988., pp. 151-164.

Chernyshov A.I., Nozhkin A.D., Mishenina M.A. Petrogeochemical Typification of the Ultramafic Rocks from the Idar Greenstone Belt, Kan Block, East Sayan. Geochemistry International, 2010, vol. 48, no. 2, pp. 118-139. https://doi.org/10.1134/S0016702910020023

Condie K.C. Archaean greenstone belts. Amsterdam, Elsevier, 1981, 434 p.

Gresham J.J., Loftus-Hills G.D. The Geology of the Kambalda Nickel Field, Western Australia. Economic Geology, 1981, vol. 76, pp. 1373-1416.

Iljina M., Maier W.D., Karinen T. PGE-(Cu-Ni) deposits of the Tornio-Narankavaara belt of intrusions (Portimo, Penikat, and Koillismaa). Mineral deposits of Finland. Amsterdam, Elsevier, 2015, pp. 133-164.

Naldrett A.J. Magmatic Sulfide Deposits. New York, Oxford University Press, 1989, 196p.

Naldrett A.J., McDonough W.F., Sun S.-S. The composition of the Earth. Chemical geology, 1995, vol. 120, pp. 223-253. 

Naldrett A.J., Turner, A.R. The geology and petrogenesis of a greenstone belt and related nickel sulfide mineralization at Yakabindi. Western Australia: Precambrian Research, 1977, vol. 5, pp. 43-103.

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