No 5 (2024)
Scientific articles
Lithological-facies structure and history of the development of Б5 formation of the Danilovsky license area (Vendian-Cambrian, Eastern Siberia)
Abstract
In 2004, exploration drilling in the central part of the Nepsko-Botuobinsk anteclise of the Leno-Tunguska oil and gas province of Eastern Siberia at the Danilovsky license area proved the oil content and prospects of the oldest carbonate deposits of the Vendian-Cambrian period. The drilled carbonate complex is characterized by a complex structure and strong variability of structural and textural features in section and laterally. A full cycle of lithological studies, including a description of petrographic sections in combination with X-ray diffraction analysis, and facies analysis of lithological rock types allowed considering the nature of deposits of the productive formation Б5 of the Danilovsky horizon. Cyanobacterial communities in the lifetime position were recorded in the section of the formation, confirming the organogenic skeleton nature of the studied deposits. Septal, chamber and clot forms of communities have been recorded. The results of the genetic analysis of geological and geophysical data formed the basis for a detailed lithological and sedimentological characteristic of the section, which allowed recreating the history of development and forming a sedimentation model of the formation. These studies laid in the basis for the petrophysical model of the formation, the planning of exploratory drilling and the introduction of an optimal development system.
3-15
Assessment of geodynamic stability of the Earth's geospheres
Abstract
The Earth, as a system, is characterized by certain average state parameters (density, temperature). These parameters cannot but depend on similar states of internal geospheres (subsystems), which follow the unified law of increasing entropy of the cooling Earth from the center in the direction of the Earth's radius. As a model for assessing the dynamic stability of the Earth's internal geospheres relative to each other, the principle of the golden proportion (golden section) was used with the given parameters of density, temperature, power of the geospheres to the extreme ratios of their states at points (0.618; 1.618; 2.618), which determine the conditions for the stable dynamic equilibrium of the compared parameters of geospheres. And if these relations satisfied the known theoretical, model, geophysical data, then the conclusion was made that the geospheres in the compared parameter relations were in a state close to a stable dynamic equilibrium of the exchange of matter and energy between them. Otherwise, it was recognized that the compared geospheres of the Earth were in a state of either unstable dynamic equilibrium with an assessment of the level of this deviation from the golden numbers, or the known values of the density and temperature of the geospheres, as well as their structure, should be subject to clarification.
Average model estimates of the parameters of the Earth's internal geospheres reach a stable dynamic equilibrium at a level of deviation from the golden numbers of up to 2.72 %. This allows estimating the model duration of the modern geological activity of the Earth for another 124 million years until the formation of a new state of the existing continents. The instability of the dynamic equilibrium of density and temperature of matter is established at the boundaries: continental and oceanic crust; oceanic crust and Golitsin layer; at the boundary between the outer part of the Earth's core and the lower mantle; inside the Earth's core at the level of identified transition zones in the four-layer core model. The presence of spheres with a high core density from 16.05 to 26.45 g/cm3 suggests the stratification of its central part into essentially gold and platinoid.
The presence of instability boundaries in the dynamic state of geospheres is in good agreement with the concept of plate tectonics and with the depths of plume origin. It can be assumed that the relative equilibrium of the internal structure of the Earth will continue for about 124 million years until the beginning of the formation of a new Pangea Proxima, which, according to Cristofor Scotese, will arise in 200 million years.
16-28
Cretaceous-palaeogene fossil resins of the arctic part of Denmark (Greenland Island)
Abstract
The article presents modern outlook on overview of the current knowledge about the first findings of fossil resins in the Arctic territory of Denmark (Greenland). On the basis of obscure and fragmentary documents, the history of their study is briefly given, the primacy of researchers who mentioned fossil resins is noted, locations of fossil resins are given, and the level of their study is assessed. A comparative description of IR-spectra of cedarite (chemawinite), shrauphite, valhovite and resin from Hare Island is given. The similarity of the latter with сedarite is shown.
29-35
Quartz-kyanite-muscovite magmatic mica in Borisovian dikes in the Southern Urals
Abstract
The article describes the simulation of ontogenesis of rock mineral aggregate with debatable genesis. Lenses or stokes of weakly deformed rocks are found in the South Urals in the block of kyanite-bearing stratified rocks of the Borisovskiye Sopki, the structure of which corresponds to the structures of igneous rocks. Induced surfaces of joint simultaneous growth are observed in all minerals — muscovite, kyanite, quartz, rutile, pyrite, monazite, xenotime and zircon. This is a paragenesis (eutectics). An interesting fact is that large quartz individuals are saturated with muscovite inclusions, while kyanite, synchronous with them, is free from muscovite inclusions, which is explained by repulsion in the melt-solution of minerals with equally charged surface. The mineral aggregate of the studied rocks lacks morphological signs of metasomatism (metacrystals, pseudomorphs, shadows of previous solid bodies) and recrystallization. This indicates magmatic genesis of the studied quartz-kyanite-muscovite rocks.
36-39
Chronicle, events, facts. History of Science
Decision of the 18th Geological Congress of the Komi Republic
Abstract
From April 10 to April 12, 2024, the 18th Geological Congress of the Komi Republic was held in Syktyvkar. More than 500 delegates representing 140 organizations and departments from 30 regions of the Russian Federation and 4 other countries took part in the Congress. The participants summed up the following results for the past 5 years: the level of oil production remained at the level of 13—14 million tons, 4 new oil fields were discovered; coal production decreased to 6—8 million tons per year; a total of 64.053 thousand tons of bauxite were mined; the reserves of titanium ores of the Pizhemskoye deposit, approved in 2020, amount to 300.4 million tons in categories C1 + C2. The production of construction sands and ASG is stable — 2.5—3 million m3. The State Geological Map at a scale of 1 : 1 000 000 (third generation) has been compiled for the entire territory of the Komi Republic.
Participants of the 18th Geological Congress of the Komi Republic consider it necessary: to pay more attention to the development of Arctic territories; to stabilize coal and oil production, to increase production and processing of natural gas; to consider the North Pre-Ural oil and gas region to be the main direction of geological exploration for oil and gas; for the Government of the Komi Republic to make a decision on the road to the Verkhne-Vorykvinskaya bauxite deposit; to create a national mining cluster on the basis of the Pizhemskoye deposit; to continue studying unconventional hydrocarbon resources, primarily the complexes of domanik and domanikoid deposits. To hold the 19th “Mining and Geological Congress of the Komi Republic” in 2029.
40-44
The 16th Russian seminar "Technological mineralogy: comprehensive assessment of non-conventional types of mineral raw materials and their rational use"
Abstract
On April 12, 2024, the 16th Russian Seminar on Technological Mineralogy was held at the Institute of Geology Komi SC UB RAS with the thematic program:
- Results of mineralogical and technological researches for a comprehensive assessment of ores of complex composition and technogenic raw materials.
- The role of technological mineralogy in assessing the mineral resource base of the North of the European part of Russia.
- Researches in the field of technological mineralogy, focused on solving problems of import substitution of specific types of mineral raw materials and environmental safety.
- Analytical equipment for researches in the field of technological mineralogy.
45-45
Silence of eternity. The Russian painting plein air at the Subpolar Urals
Abstract
From August 14 to August 22, 2023, the Russian painting plein air “Shift art team. There is such a profession — to draw the Homeland" in the Yugyd Va National Park of the Komi Republic. Professional artists and art experts took part in the week-long cultural expedition. The artists received new impressions of the protected places of the Subpolar Urals and created paintings from nature. The plein air ended with a public final display of artwork at the Inta Museum of Local Lore. The project became a landmark event in the cultural life of the Komi Republic.
46-48