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THE FORMS OF CHEMICAL INDICATOR ELEMENTS OF SALT HALOS OF POLYMETALLIC ORE OCCURRENCES

UDC 550.42 : 546.4./7 : 631.4 (477)

https://doi.org/10.15407/mineraljournal.38.02.082

N.O. Kryuchenko (1), E.Ya. Zhovinsky (1), O.A. Andrievska (2)

(1) M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680

Е-mail: nataliya-kryuchenko@mail.ru; zhovinsky@ukr.net

(2) T.G. Shevchenko Gymnasium No 109

24, P. Mirnogo Str., Kyiv, Ukraine, 01011

Е-mail: andrlena@yandex.ru

THE FORMS OF CHEMICAL INDICATOR ELEMENTS OF SALT HALOS OF POLYMETALLIC ORE OCCURRENCES

Language: Ukrainian

Mineralogical journal 2016, 38 (2): 82-87

Abstract: The important problem in performing lithogeochemical search of ore occurrences of deep-seated polymetals is the revealing of indicator elements which form secondary salt halos in the surface deposits over the ore occurrence. Depending on physico-chemical conditions in the way of migration and peculiarities of the geochemical barrier, the indicator elements can exist in various forms and compounds. This depends on their mineral composition and acid-base conditions of the environment. Mobile forms of metals were determined using the atomic adsorption and ion-selective method. The forms of metal migration in the salt halos were computed with the help of PHREEQC program. The results of mathematical and thermodynamic modeling of existence of various forms of chemical elements in solutions of surface sediments (soil) in different acid-alkaline conditions. It has been determined that the predominant form of copper and lead in the supergene zone at pH < 6 are cationic (mobile), this form is characteristic of zinc at pH < 7.5. Carbonate and hydroxyl forms (which are insoluble) of metal existence in soil solutions are prevailing in alkaline conditions. It was established on the example of Prutivsky, Rodionivsky and Krutobalkinsky copper ore occurrences in the territory of the Ukrainian Shield, that in slightly alkaline environment, where mobile forms of ore elements (copper) cannot exist, the local salt halos over the ore occurrences can form cationic forms of other metals (Zn, Pb, etc.) that allows using the latter as indicator elements in such physical and chemical conditions. The technology of salt halo contrasting by mobile (cationic) forms of the indicator elements has been developed. They are determined in soil solutions of surface deposits (ashed, clay, ordinary black soil) by adding 0.1n HCl and creating acid conditions with pH < 6. It has been found that the highest acidification in determining the indicator elements is required for podsolized black soils, which are characterized by the presence of organomineral colloids with high absorptivity.

Keywords: metal, forms of migration, soil, ore occurrences, elements of the indicator, acid-alkaline conditions, salt halo.

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