Abstract

The article presents the results of a study of brown coal from the Verkhnedneprovsk deposit located in the northeastern Dnieper brown coal basin (Dneprobass) within the Srednedneprovsk block of the Ukrainian Shield. It is shown that the Paleogene brown coal formed in Dneprobass in the Middle Eocene during the subsidence of the Srednedneprovsk block and the marine transgression from the Dnieper–Donets depression into erosional-tectonic paleovalleys. Development conditions of the Paleogene brown coal formation corresponding to a single polyfacies sedimentation cycle, with coal as one of the facies, are characterized. It is established that the presence of various petrographic coal types in the seam section and their cyclic distribution, associated primarily with different conditions of the accumulation and decomposition of organic residues, is related to geotectonic constraints. Depending on the peat bog position in the paleovalley, the peat was accumulated in coastal lowlands under the influence of the marine environment or in overgrown swampy lakes. Increased bitumen content in the studied coals and high wax content in the bitumen should be explained not only by their enrichment in liptinite and the presence of a significant amount of wax-bearing plants in the initial material, but also by the specific conditions of peat plant material decomposition under the influence of seawater.

中文翻译：

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第聂伯布朗煤盆地 Verkhnedneprovsk 矿床基于煤岩学成分的沉积物和泥炭成藏条件重建

摘要

本文介绍了对乌克兰地盾 Srednedneprovsk 区块内第聂伯褐煤盆地 (Dneprobass) 东北部 Verkhnedneprovsk 矿床褐煤的研究结果。结果表明，古近纪褐煤形成于始新世中始新世的第聂伯盆地，是在 Srednedneprovsk 地块下沉和第聂伯-顿涅茨坳陷向侵蚀构造古河谷海侵过程中形成的。表征了以煤为相之一的单一多相沉积旋回的古近系褐煤地层发育条件。已经确定，煤层剖面中存在各种岩相煤类型及其循环分布，主要与有机残留物积累和分解的不同条件有关，与大地构造约束有关。根据古河谷泥炭沼泽的位置，泥炭在海洋环境的影响下堆积在沿海低地或杂草丛生的沼泽湖泊中。所研究煤中沥青含量的增加和沥青中蜡含量的增加不仅可以解释为它们富含 liptinite 和初始材料中存在大量含蜡植物，还可以解释为泥炭植物的特定条件在海水的影响下材料分解。