No 8 (2025)
Scientific articles
DISSYMMETRIZATION IN EUDIALYTE-GROUP MINERALS. VI. FEATURES OF P3-MODEL STRUCTURE OF THE HIGH CALCIUM EUDIALYTE ANALOGUE FROM THE TAMAZERT MASSIF (MAROCCO)
Abstract
Crystal structure of a high calcium eudialyte group member from the Tamazert massif, Morocco, with the following stoichiometry (calculated on 26 atoms Si + Nb, Z = 3): Na8.1K0.45Ln0.6Ca7.2Mn2.2Fe1.5Zr3.1Nb0.8—0.9Si25.1—25.2Cl0.3(CO3)0.4 by X-ray has been studied. The studied mineral is a fragment of a crystal of potentially new high calcium mineral with a complex growth zoning studied earlier. It differs from the latter by higher contents of Ca, Na and Nb. The unit-cell parameters are: a = 14.1530(1) Å, c = 30.0801(2) Å, V = 5218.1(5) Å3, space group P3. The structural model characterized by 163 crystallographic sites is refined to R = 5.48 % using 4644 independent reflections with c F > 3(F). The cation distribution over the key sites in the frame of the low symmetry (space group P3) is more detailed as compared to the classical model with rhombohedral R-symmetry.
Vestnik of geosciences. 2025;(8):3-8
3-8
MONITORING POST-TORRENTIAL RIVERBED CHANGES USING UAV TECHNOLOGY
Abstract
The development, adaptation, and improvement of methods and algorithms for obtaining, processing, and integrated use of near-Earth remote sensing data using unmanned aerial vehicles (UAVs) and modern software (SW) is an urgent task in the development of information models for monitoring potential hazards. This study demonstrates the implementation of digital methods for monitoring hazardous natural processes in a mountain riverbed. As a result of data processing, orthophotos and digital models of the study area have been created. The study quantifies of denudation and soil accumulation caused by the passage of a mudflow through the riverbed. The results are used in the development of measures to protect settlements and infrastructure facilities from the negative effects of hazardous natural processes
Vestnik of geosciences. 2025;(8):9-13
9-13
CRETACEOUS-PALEOGENIC FOSSIL RESINS OF YAKUTIA: MOLECULAR COMPOSITION AND THERMAL PROPERTIES
Abstract
A novel study of fossil resin from Yakutia has been conducted using infrared spectroscopy and differential thermal analysis. The resins are exclusively gedanites, although retinite may also be found. Gedanites are more oxidized than retinites.
For the first time, we analyze information on coniferous plant remains within the location of the studied fossil resins. This analysis confirms that conifers from the families Cupressaceae and Taxodiaceae can really be the main botanical sources of the formation of gedanite, while the Pinaceae family — of retinite.
Vestnik of geosciences. 2025;(8):14-24
14-24
ESTIMATION OF THE DEGREE OF RECRYSTALLISATION OF CARBONATES BASED ON MACHINE LEARNING USING THIN SECTIONS
Abstract
Recrystallisation processes in carbonates can affect the chemical and isotopic composition, the preservation of organic matter and fossils, change the filtration-capacity properties of the rock. Consideration of these processes seems to be critical for correct interpretation of the results of a wide range of analytical studies. On the basis of computer vision and machine learning technology the models for qualitative and quantitative express estimation of the degree of recrystallisation of sedimentary carbonate rocks are developed on the basis of thin-section images. The models have been trained on the basis of 300 images and 45000 fragments of thin-section images. The achieved accuracy of the models exceeds 90 %. The results of application of models and software based on them can be used for comparison of geochemical and isotopic information, as well as for express selection of the least recrystallised samples for analytical studies.
Vestnik of geosciences. 2025;(8):25-30
25-30
Chronicle, events, facts. History of Science
STATE REGISTRATION OF INTELLECTUAL DEVILERABLES IN 2025
Abstract
The Museum Database encompasses the entire museum collection: the main fund, the working collections fund, the historical-archival fund, and the library fund. It implements a division into funds bearing the same name and collections consisting of museum items. The development is based on a relational data design approach, and PostgreSQL was chosen as the DBMS (Database Management System). A web interface based on Django technologies has been developed to implement the user interface and management functions. This development ensures the centralized storage of information about museum specimens from the funds of the A. A. Chernov Geological Museum and provides cross-platform access to the data via the museum website.
Several software products have been developed and patented at the Institute of Geology: an application for acquiring and processing AFM data, as well as a database for museum specimens.
The CrystalGrowthTool application is created to obtain kinetic data on crystal growth from solution using AFM images. It is developed in Python using the PyQt5 toolkit and is compatible with Windows XP (SP2) and later operating systems. The application facilitates and accelerates the routine process of obtaining coordinates for the edges of growing steps for subsequent analysis. CrystalGrowthTool minimizes the number of points required for the software description of a step and then tracks the movement of these steps. It can operate in various coordinate systems (spherical and elliptical), which is convenient for describing dislocation hillocks. The CrystalGrowthTool application can be used in various fields of knowledge to calculate the advancement velocity of objects.
Vestnik of geosciences. 2025;(8):31-35
31-35