Mineralogical and petrographic characteristics of the host rocks of the Pervaya Rudnaya Gorka Fe-skarn ore occurrence

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The article discusses the mineralogical and petrographic features of the metamorphic formations of the poorly studied and promising the Pervaya Rudnaya Gorka Fe-scarn ore occurrence (Kongor ore region), localized in the Voikar, and the typification of host rocks by mineral composition. In order to clarify the ore-forming affiliation of the Pervaya Rudnaya Gorka ore occurrence, the comparative analysis was carried out with the reference to well-studied Novogodnee-Monto Au-Fe-skarn deposit (Toupugol-Khanmeishor ore region), which showed similar mineral composition, structural and texture features and geological structure of ore objects. According to the results of studies, a close composition of the enclosing volcanic-sedimentary rocks, in particular the skarn formations, containing the gold-sulfide-magnetite mineralization at the Novogodnee-Monto ore deposit; connection with the same intrusive complexes (Sob’, Kongor, and Musyur) and faults of the north-western direction. Using the microscopic method of research, the changes in the propylite formation area at the Pervaya Rudnaya Gorka ore occurrence, indicating a large-scale regional pre-ore metasomatism, were first identified and described in detail. The following metasomatic zonation (from the inner to the outer zone): actinolite + epidote → chlorite + actinolite + epidote → chlorite + epidote was been established at the ore field. Based on the obtained research results, it is concluded that the poorly studied territories of the Polar Urals are promising.

About the authors

Ekaterina S. Ivanova

Institute of Precambrian Geology and Geochronology, Russian Academy of Science

Author for correspondence.
Email: ekate.s.ivanova@gmail.com
ORCID iD: 0000-0002-5446-2484

engineer in the Laboratory of Metallogeny and Ore Genesis

2 Naberezhnaya Makarova, Saint Petersburg, 199034, Russian Federation

Julia N. Ivanova

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences; Peoples’ Friendship University of Russia (RUDN University)

Email: jnivanova@yandex.ru
ORCID iD: 0000-0001-9742-9791

PhD, researcher in the Laboratory of Geology of Ore Deposits, Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry; Associate Professor, Department of Mineral Developing and Oil & Gas Engineering, Academy of Engineering, Peoples’ Friendship University of Russia

35 Staromonetnyi Pereulok, Moscow, 119017, Russian Federation; 6 Miklukho-Maklaya St, Moscow, 117198, Russian Federation

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Copyright (c) 2021 Ivanova E.S., Ivanova J.N.

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