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Vol 183
Pages:
101-111
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RUS

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

Authors:
S. O. Ryzkova1
I. V. Talovina2
V. G. Lazarenkov3
N. I. Vorontsova4
V. L. Ugolkov5
About authors
  • 1 — Post-graduate student, Scientific Secretary Saint-Petersburg State Mining Institute (Technical University)
  • 2 — Ph.D. Assistant Saint-Petersburg State Mining Institute (Technical University)
  • 3 — Ph.D., Dr.Sci. Professor Saint-Petersburg State Mining Institute (Technical University)
  • 4 — Ph.D. Assistant Saint-Petersburg State Mining Institute (Technical University)
  • 5 — Ph.D. Institute of Silicate Chemistry of RAS
Date submitted:
2008-10-01
Date accepted:
2008-12-05
Date published:
2009-04-01

Abstract

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).

Keywords:
weathering crust iron-oxide zone serpentinites magnetite
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References

  1. Варлаков А.С. Петрология процессов серпентинизации гипербазитов складчатых областей. Свердловск: Изд-во УНЦ АН СССР, 1986. 224 с.
  2. Дир У.А. Породообразующие минералы / У.А.Дир, Р.А.Хауи, Дж.Зусман. М.: Мир, 1966. Т.3. 316 с.
  3. Капусткин Г.Р. Минералогические особенности в формировании оксидов – гидроксидов железа в процессе выветривания серпентинитов Южного Урала / Г.Р.Капусткин, И.Е.Горшкова, А.В.Савцов // Кора выветривания. Москва, 1986. Вып.19. С.66-77.
  4. Куземкина Е.Н. Никельсодержащий магнетит // Никеленосные коры выветривания Урала. М.: Наука, 1970. С.193-202.
  5. Эдельштейн И.И. Вещественный состав продуктов выветривания на ультраосновных породах Буруктальского массива // Материалы по геологии и полезным ископаемым Южного Урала. М.: Госгеолтехиздат, 1956. Вып.1, С.38-60.
  6. Incorporation of Ni into natural goethite: An investigation by X-ray absorption spectroscopy / M.L.Carvalho-e-Silva, R A.Y.amos, A.C.N.Tolentino, J.Enzweiler, S.M.Netto, M.C.M.Alves // Amer. Mineral. 2003. Vol.88, pp.876-882.
  7. Manceau A. Heterogeneous distribution of nickel in hidrous silicates from New Caledonia ore deposits / A.Manceau, G.Calas // Amer. Mineral. 2000. Vol.0, pp.9-558.
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