pdf № 338, February

DOI: 10.19110/geov.2023.2.1

The paper considers the geophysical anomalies computer modeling from the structures obtained by analog physical modeling of shear deformations. Based on the results of physical modeling of slip-strikes (performed by other authors), a generalized petrophysical model was built, and then direct tasks of gravity and magnetic surveys were solved. The features of the resulting fields are presented, which can help in the interpretation of geophysical data over structures where shear faults are developed — these are chains of anomalies of different signs extended along the general fault. The applicability of experimental geotectonics results for digital modeling of geophysical anomalies is confirmed and the corresponding methodological approach is tested.

Keywords: geophysics, tectonics, shear, gravity survey, magnetic survey, modeling.

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DOI: 10.19110/geov.2023.2.2

We have analyzed the mineralogical and geochemical properties of gold ore deposits in the Western Uzbekistan, characterized by multi-stage and heterogeneous structure along the section. The systems of clarke values for the concentration of ore-forming elements were used as criteria for assessing deposits. The features of CC distribution by depth gradations are determined and, on this basis, the prospects for gold in deep horizons of deposits are estimated.

Keywords: Uzbekistan, gold deposits, distribution, mineralogical and geochemical characteristics, assessment of industrial prospects.

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DOI: 10.19110/geov.2023.2.3

An electroacoustic echo method for studying the high-frequency (HF) electrical and elastic properties of piezoelectric materials in a finely dispersed state is described. The characteristics and relaxation time of electroacoustic echo for natural and artificial quartz powders are determined. Natural one is represented by the following types: smoky quartz, citrine, amethyst, recrystallized, granular and columnar. It is shown that natural quartz (especially citrine), has a higher electromechanical coupling coefficient than artificial quartz. The amplitudes of HF electric field are determined, at which the saturation mode of the echo signals is observed.

Keywords: artificial and natural quartz, electroacoustic echo, relaxation time and echo parameters, powder.

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DOI: 10.19110/geov.2023.2.4

The article for the first time publishes six letters and photos of the famous Russian crystallographer and mineralogist Dr. Sci. (Geol. & Mineral.) E. V. Zinserling (1887—1979) from the personal archive of Prof. D. P. Grigoriev (1909—2003), covering the period from 28.10.1958 to 02.03.1964, and also official letters from the Moscow State University from 15.12.1958 with the abstract of her dissertation and from the All-Union Scientific Research Institute of piezo-optical mineral raw materials from 28.09.1962 and 03.01.1963 with a request for reviewing and scientific editing of her articles. All documents are original, manuscripts are transcribed and attributed by the author. The article is relevant due to advocating priorities of domestic science and technology. The work is aimed at the fullest possible coverage of the creative life and professional activity of Dr. Sci. E. V. Zinserling, which is insufficiently characterized in historical and popular scientific literature. The materials presented in this article substantially complete and enliven her biography, which is full of comprehensive studies of natural and synthetic quartz, with world-class results implemented in industrial technology. Attention is drawn to the importance of personal archives of outstanding personalities in the study of the history of science. Professor D. P. Grigoriev’s archive in his letters and other documents (protocols, programs, conference transcripts, etc.) reflects a whole layer of the pre- and post-war history of Russian mineralogy.

Keywords: D. P. Grigoriev, E. V. Zinzerling, crystallography and mineralogy of quartz, history of mineralogy.

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DOI: 10.19110/geov.2023.2.5

We found deposits of undoubtedly volcanic phases and microminerals — silicate, sulfate, hydroxychloride, oxide, and sulfide — with clear ontogenic signs of natural growth on the sculpted surface of two diamonds extracted from the products of the Tolbachik Fissure Eruption 2012—2013 (TFE-50). This fact obviously confirms the natural volcanic origin of Tolbachik diamonds.

Keywords: Kamchatka, Tolbachik Fissure Eruption, diamonds, volcanogenic origin.

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