Structures of sulfide melt crystallization as an indication of metamorphism of the ores in the Oleninskoe gold deposit
| Autor: | Kalinin A. A., Savchenko Y. E. |
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| Jazyk: | ruština |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Vestnik MGTU, Vol 23, Iss 1, Pp 29-37 (2020) |
| Druh dokumentu: | article |
| ISSN: | 1560-9278 1997-4736 |
| DOI: | 10.21443/1560-9278-2020-23-1-29-37 |
| Popis: | Multiphase fine aggregates of galena, pyrrhotite, freibergite, pyrargyrite, diaphorite, fizelyite, uchucchacuaite, ullmanite, and some other minerals are found in the ores of the Oleninskoe gold deposit in the Kolmozero-Voronya greenstone belt (Kola Peninsula, Russia). The aggregates are considered to be the product of crystallization of sulfide melt formed of the minerals of low-melting-point chalcophile elements (Zn, Ag, Cd, Tl, Pb, As, Sb, Bi, Se, Te, etc.) during heating to the temperature above 500 °C. This origin of the aggregates is affirmed by: 1) multiphase composition (up to 6 minerals) of the aggregates; 2) absence of signs of replacing early minerals by the late ones; 3) essential presence in the aggregates of the minerals of chalcophile elements Ag, Pb, Sb, i. e. elements with a low melting point of their compounds; 4) roundish droplet form of inclusions of minor minerals in the main sulfide, and 5) aggregates' position at the boundary sulfide – quartz or in fractures in vein minerals. Partial melting and crystallization of sulfide melts took place during Paleoproterozoic metamorphic event, when the Neoarchean sulfide-bearing rocks were mid-amphibolite metamorphosed under the temperature > 500 °C. Signs of the Paleoproterozoic metamorphism are found in the ores of the neighboring Cu-Mo porphyry Pellapahk deposit as well. |
| Databáze: | Directory of Open Access Journals |
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