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S. O. Ryzhkova
S. O. Ryzhkova
Saint Petersburg State Mining University
Saint Petersburg State Mining University
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Geology
  • Date submitted
    2016-11-17
  • Date published
    2012-02-01

Distribution of rare earth elements in ores Elov and Buructal supergene nickel deposits

Weathering processes and infiltration metasomatic processes in the weathering crusts hyperbasite arrays have a positive effect  on  the accumulation  of rare earth  elements. The content of rare earth elements is steadily increasing bottom-up on the profile of weathering.  Metasomatic upper profile characterized by a high content  of rare earth  elements, which leads to  the appearance of rare earth elements phosphate mineral phase – xenotime found in this laterite for the first time. The composition of the rare earth elements in incorporating their metasomatic and minerals demonstrates chondritic distribution.

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A. G. Pilyugin, I. V. Talovina, N. I. Vorontsova, S. O. Ryzhkova, O. P. Mezentseva (2012) Distribution of rare earth elements in ores Elov and Buructal supergene nickel deposits. Journal of Mining Institute. Vol 196. p. 31.
Current problems in geology and exploration of mineral deposits
  • Date submitted
    2016-11-25
  • Date published
    2011-06-01

Geochemical barriers in supergene nickel deposit on the example Buruktal deposit (South Urals)

The main geochemical barrier in supergene Buruktal nickel deposit is oxygen oxidized barrier in upper ferrous-oxide zone of the deposit. It makes sharp decrease of chemical element migration. Nevertheless, ore mineral concentrations present oft in complex geochemical barriers: absorbed-oxidized, carbonate-reducing and others. Every type of the geochemical barriers is able to concentrate specific association of migrated elements. That reflected on the different values of coefficients of enrichment in different types of Buruktal metasomatites. Oxidized barrier is more effective for elements with different valence (Fe, Mn), and absorbed clay, ferrous-oxide und manganese-oxide barriers are more effective for the main part of microelements.

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I. V. Talovina, V. G. Lazarenkov, N. I. Vorontsova, S. O. Ryzhkova, O. P. Mezentseva, A. G. Pilyugin (2011) Geochemical barriers in supergene nickel deposit on the example Buruktal deposit (South Urals). Journal of Mining Institute. Vol 194. p. 112.
Geology, search and prospecting of mineral deposits
  • Date submitted
    2016-12-28
  • Date published
    2009-04-01

Prospects of nickel industry in the urals in the light of ore field structure study in supergene nickel deposits

Tectonic fractures of meridian spread, masked by block system of neotectonic breaks, play the leading role in structural control of nickel mineralization in supergene nickel deposits in the Urals. The deposits have long-term genesis and polygenic character. They are characterized by intensive tectonic and hydrothermal workup of Paleozoic substrate and block structure with small amplitude of vertical displacement. All of them have a two-floor structure, where upper supergene floor has a «background» of lower hydrothermal floor. This fact considerably increases the field of geological prospecting and searching of new oxide-silicate nickel deposits in the Uralian region.

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N. I. Vorontsova, I. V. Talovina, V. G. Lazarenkov, S. O. Ryzhkova, O. P. Mezentseva (2009) Prospects of nickel industry in the urals in the light of ore field structure study in supergene nickel deposits. Journal of Mining Institute. Vol 183. p. 78.
Geology, search and prospecting of mineral deposits
  • Date submitted
    2016-12-28
  • Date published
    2009-04-01

Nickel-containing iron oxides in the Buruktal deposit, South Urals

In the Buruktal supergene nickel deposit, iron oxides possess vertical mineralogical zoning (bottom-up): magnetite-maghemite-goethite-hematite. The main rock- and ore-forming mineral in the iron-oxide zone of the deposit is magnetite, presented by three generations: primary relic magnetite, surviving from ultramafic rocks; secondary magnetite, forming at serpentinization process and neogenic supergene magnetite. Supergene magnetite, like a goethite, is nickel ore mineral, containing about 1 % NiO. Under the complex thermal analysis data, maghemite-magnetite and goethite have two main diagnostic maximums: exothermal effect of magnetite, caused by magnetite oxidation to maghemite in the interval 317‑340 °С, displays maximum at 327 °С («magnetite» point), and endothermic effect of goethite, connected with loss of constitutional water of the mineral and its transition to hematite in the interval 269‑296 °С, displays maximum at 288 °С («goethite» point).

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S. O. Ryzhkova, I. V. Talovina, V. G. Lazarenkov, N. I. Vorontsova, V. L. Ugolkov (2009) Nickel-containing iron oxides in the Buruktal deposit, South Urals. Journal of Mining Institute. Vol 183. p. 101.