Mineralogical and geochemical features of the bazhenov formation, West Siberia, according to nuclear-physics and electron-microscopic methods of research
The research relevance consists in determining the demand in investigation of potential uranium-bearing black shales in the West Siberia, which, in its turn, would expand the existing Russian mineral resources. The main aim of the study is to identify geochemical and mineralogical specialization of...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Russian |
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Tomsk Polytechnic University
2019-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/1513 |
| Summary: | The research relevance consists in determining the demand in investigation of potential uranium-bearing black shales in the West Siberia, which, in its turn, would expand the existing Russian mineral resources. The main aim of the study is to identify geochemical and mineralogical specialization of the Bazhenov formation, using modern research methods, and potential of the Bazhenov formation as a source of uranium. The methods used in the study. Chemical composition was determined by instrumental neutron activation analysis, to clarify the composition of mineralization a scanning electron microscope HITACHI S-3400N was used; the spatial distribution of uranium mineralization was identified by the fragmentation (f) radiography method. The results. The Bazhenov Formation contains U, Zn, Sr, Ba in 3 times more and As, Co, Tb in 1,5 times more than average black shales, these rocks contain as well less Au, Sm, La, Cr, Rb. The correlations between chemical elements shows two alternative geochemical associations: «clastophile» (Na, Sc, Cr, Rb, Cs, La, Sm, Hf) - elements related to Th and Ta (the usual components of terrigenous mineral fraction), and «organophile» (Zn, As, Sb, Ba, Au, U) - elements related to the organic matter. Br content in these rocks is very low. Gross content of U in bituminous rocks of the Bazhenov Formation is 41,2 ppm. Uranium distribution in the rocks is extremely unequal. High concentrations of uranium are clearly linked to the remnants of organic matter, represented by radiolarians and ichthyofauna. Mineral aggregates of U, represented by uranium oxides, are detected in the form of microinclusions in Ca-P-Si cryptocrystalline weight with high carbon content. A number of chemical elements Fe, S, Zn, Ba, Sr, As, Sb, U, and rare earth elements with higher concentrations, form their own mineral forms. Iron sulfide is extended greatly in the rocks. It has, at least, three morphological forms. Mineral forms of barium (barite?) and strontium (strontianite?) are widespread as well. Zinc is found in the form of zinc sulfide (sphalerite?) and in the form of intermetallic compounds with Cu, Sb, As. Sometimes there are minerals of rare earth elements, Sn and Pb. Own mineral forms of Mo, Ni and V are not identified, despite the fact that their content is high in the rocks. |
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| ISSN: | 2500-1019 2413-1830 |