УДК 549.08 https://doi.org/10.21440/2307-2091-2019-1-60-66 

M. S. Glukhov / News of the Ural State Mining University. 2019. Issue 1(53), pp. 60-66


Relevance of the work: The origin of iron oxide microspheres is associated with cosmic, terrestrial (abiogenic, biogenic) and technogenic processes. The study of such objects is important for the knowledge of mineral formation on Earth, the structure and composition of cosmic bodies, the role of man-made processes in the formation of new minerals. The detection of microspheres in sedimentary strata helps to complement the methods of correlation of different facies strata at the global, regional and local levels and helps in the search for stratified minerals as well.
Purpose of the work: study of features of the internal structure of natural and man-made iron oxide microspheres. Main tasks: study of pore space and possible textures, check for the presence of differentiation of a substance.
Research methodology: All studied objects were taken from powdered samples using a permanent and neodymium magnet. With the help of microtomography, iron oxide microspheres selected from the magnetic fraction from impactites of the Ris crater (from the Upper Paleozoic rocks of the East European Platform and the Pre-Ural fore deep), and man-made (welding) microspheres were studied. The same objects in polished sections were examined using scanning electron microscopy.
Results. The study of X-ray computer microtomography objects in two-dimensional and three-dimensional space showed differences in the voids of technogenic and natural microspheres. The differences are confirmed by electron microscopy. The differentiation of the substance in iron oxide microspheres is confirmed by tomographic studies and electron microscopy. Chemical composition was studied for the inner part of iron oxide microspheres from the impactites of the Ris crater. The primitiveness of the chemical composition confirms their cosmic origin.
Conclusions. The combined use of the conventional approach with precision methods approximates the decoding of the genesis of microobjects.

Keywords: iron oxide microspheres, microtomography, electron microscopy, voids, substance differentiation.




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