Конкреционные образования в угленосных толщах привлекли в последние годы внимание литологов как явление, облегчающее фациальный анализ и воспроизведение обстановки формирования угленосных осадков. В практике изучения угленосных бассейнов уже известны примеры использования· конкреций в качестве признаков для стратиграфического - расчленения. угленосных толщ и синонимики угольных пластов. В этом отношении представляют интерес и конкреции угленосной толщи Ткварчельского месторО1ждения, краткое описание которых приводится в настоящей заметке по результатам исследования автором образцов, собранных в 1949 г.
The properties of coal in the Nelidovsky district are generally characterized in exploration reports based on the results of petrographic and chemical analyses of core samples. The exploration materials indicate that humus coal varieties (duren, clarene-duren and claren) are predominantly common in the Nelidovsky district, while humus-sapropel varieties are less common. The analyses provided in the same materials show a clearly expressed inconstancy of the chemical composition of coal. Thus, its technical composition is characterized by the following data: hygroscopic humidity from 2.85 to 33.74%; ash content of dry coal from 28.41 to 46.63%; volatile yield on a dry basis from 21.21 to 33.03%; total sulfur from 1.16 to 2.30%. The elemental composition of the organic matter is as follows: carbon from 68.05 dog 75.42%; hydrogen from 4.42 to 5.70%; nitrogen from 0.33 to 1.30% and oxygen in total with sulfur from 20.93 to 26.33%. The yield of dry distillation products: moisture from 3.90 to 15.60%; resins from 3.50 to 9.00%; semi-coke from 63.26 to 83.60%; gas and losses from 6.80 to 12.20%. The calorific value of dry coal fluctuates within 3470-5269 calories. Obviously, the main reason for the inconsistency of chemical properties is the petrographic heterogeneity of coal. Therefore, to resolve the issue of the most rational use of coal in this newly developed region, it is important to know what role each of the petrographic types plays in the formation of the layers and their properties.
Over the past years since the beginning of the industrial development of the Kuznetsk Basin, petrographic studies have covered coals from almost all known deposits within the boundaries of the basin. The results of coal petrographic studies, which contributed to exploration and identification of the quality of coals in the basin, have been published in a number of works. However, most of these works concern those deposits whose coals are of interest as metallurgical fuel and as chemical raw materials. Significantly less attention has been paid to coal petrographic studies of power-generating coal deposits, which include Aralichevskoe. In particular, in works on the study of coals from the Aralichevskoe deposit, their petrographic properties are usually mentioned in passing. In essence, there are no complete coal petrographic studies of this industrially important deposit with unique coal quality. The information presented in this article cannot be considered exhaustive, but to a certain extent it still fills the existing gap in the coverage of the petrographic properties of coals and the structure of coal seams Aralichevskoe deposit. The article is written based on the materials of petrographic testing of coal seams and office processing of samples, carried out by the author in the pre-war years in connection with the dissertation work on the comparison of coal seams of the Prokopyevskoe and Aralichevskoe deposits based on coal petrographic features.
