M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine

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Isomorphic and non-isomorphic impurities and radiation-stimulated processes in nano-sized fragments of mineral structures in connection with solution of environmental and mineralogical problems associated with minerals

ABSTRACT

Report on the SRW: 1 book, 86 pages, 31 illustrations, 10 tables, 32 references.

The objects of the study are alkaline feldspars and plagioclase (60 samples) from the Klintsiv gold deposit of the intrablock Kirovohrad fault zone, feldspars and quartz from gold-bearing deposits of Ukraine and other regions, uranium-bearing albites (30 samples) from the Vatutyna deposit of the Ukrainian shield.

The purpose of the work: establishing the features of isomorphic and non-isomorphic substitutions and radiation-stimulated processes in nanoscale fragments of mineral structures, studying the dependence of the composition and properties of minerals on the conditions of their formation and radiation effects, as well as establishing typomorphic signs of radiospectroscopic characteristics of minerals, in connection with the solution of environmental problems related to radioactive elements and mineralogical problems related to minerals, as well as detection of structural changes in feldspars and quartz of various genetic types related to gold and uranium ore formation.

Research methods and equipment: the method of nuclear magnetic resonance on ¹H, ²³Na and ²⁷Al nuclei in the stationary mode and in the mode of high resolution during rotation of the sample under the magic angle (MAS) (spectrometer Avance-400 (Bruker, Germany)), the method of electron paramagnetic resonance (EPR spectrometers RE-1306, PS100X (Belarus)).

Results and their novelty: Using the EPR method, the gold typomorphism of NH₃⁺ isomorphic radical ions associated with radiation-stimulated processes in nanoscale fragments of mineral structures, in potassium feldspars was reasonably proven, and it was suggested that ammonium played an important role at all stages formation of hydrothermal deposits of this metal. The conducted study showed the effectiveness of the 1H NMR method in determining the types of water in nominally anhydrous feldspars and their structural changes. It was shown that the number of plagioclase (percentage of albite), the coordination of aluminum ions (AlVI, AlIV) and the distribution of Al/Si and Na/Ca can be determined using the NMR method on ²³Na and ²⁷Al nuclei. The obtained data show that the formation of the Klyntsiv gold ore deposit was accompanied by noticeable hydrothermal changes in the structure and composition of feldspars. The conducted research showed that using magnetic resonance methods, it is possible to distinguish p.sh. uranium-bearing albitites from ore-free ones at relatively low concentrations of the ore component, which can be used as a search criterion in connection with the solution of mineralogical problems related to minerals.

Recommendations for using the results of the work: The results can be used in geology and mineralogy: when solving a wide range of geological problems, including determining the conditions of formation/transformation of feldspars and quartz, and their connection with gold and uranium deposits.

Authors:

Kalinichenko Anatolii Mykhailovych

Dudchenko Nataliia Oleksandrivna

Kalinichenko Olena Anatoliivna

Bahmut Mykola Mykolaiovych

Other authors:

Keywords:

feldspars, nuclear magnetic resonance, electronic paramagnetic resonance, gold, uranium, minerals

Head of the research:

Bryk Oleksandr Borysovych

Registration Card (RC):

0112U002431