FORMATION CONDITIONS OF THE PALEOGENE COALS IN THE SULA-UDAISKE DEPOSIT OF THE DNIEPER-DONETS COAL-BEARING AREA

• Видавець: Institute of Geological Sciences, NAS of Ukraine
• Дата: 2021
• Автори: ЗАЙЦЕВА, Л.Б., ІВАНОВА, А.В., ГАВРИЛЬЦЕВ, В.Б.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Geological Sciences, NAS of Ukraine 2021
• Теми: торфонакопичення; буре вугілля; вугленосність; мікрокомпоненти; петрографічні типи вугілля; peat accumulation; brown coal; coal-bearing; microcomponents; petrographic types of coals
• Онлайн доступ: http://geojournal.igs-nas.org.ua/article/view/238131

We studied brown coals in the Sula-Udaiske deposit, located within the Dnieper-Donets coal-bearing area, in the vast Sukhonosivsko-Romodanivsky compensation trough, which was formed as a result of the growth of the Logovikivska, Poznyakivska, Vysachkivska, Romodanivska, Hasenkivska salt-dome structures. The trough is filled with Paleogene- Neogene and Quaternary sediments. The Beretska formation of Paleogene is coal-bearing. It contains five coal seams, of which the most regular seams of working height are the Lower, which lies at the base of the coal-bearing strata, and the Upper, which completes the section. The brown coal deposit is confined to the deepest part of the trough and wedges out to its periphery. It is shown that the Paleogene brown coal formation is a multifacial structure that constitutes a cycle of sedimentation, one of the facies of which is coal. The composition of the sedimentation cycle was determined by the geotectonic regime, which defined the paleogeographic conditions, the rate of subsidence of the wetland, the degree of watering and flow of peatlands, and the scale of microbial activity. According to the groups of microcomponents quantitative ratio, brown coal is divided into petrographic types alternating in the section of the seam due to the cyclical change in the conditions of peat accumulation. Peat cyclicity is determined by different ratios in separate interlayers of different types of peat-forming plants, by heterogeneity of their remains and unequal degree of preservation of plant material. The predominant types of coal are gelites, lipoid-gelites and lipoid-gelitites, which make up 85% of the coal mine. In terms of quality indicators, the studied coals correspond to brown coals of a low coalification degree. It was found that the peat accumulation during the formation of working height layers occurred in the coastal sea lowland conditions, as well as in the conditions of overgrown lakes and flooded forest swamp.