Abstract The investigation of the relationship between paleoenvironmental conditions and distribution and relative abundance of specific saturated and aromatic hydrocarbons was the main objective of this study, thus marking the parameters, which were most sensitive to environmental changes. Insights on the type, generative potential, and maturity of organic matter (OM), as well as paleoclimate conditions, along with the reconstruction of depositional settings of the northwest part of the Toplica basin (Serbia), were provided. Organic petrographic, palynofacies, organic geochemical, mineralogical, and XRF analyses were carried out to investigate 40 sediment samples of the Prebreza and Cucale sedimentary units. Investigated samples were deposited in the saline and anoxic environment, under semi-arid to semi-humid/humid climate conditions, along with the constant inflow of volcanoclastic material. The predominance of δ-methyltrimethyltridecil chroman (δ-MTTC) within euxinic portions of the stratified water column was associated with an increase in salinity, which was noticed for sediments of the Prebreza unit. Sediments from this stratigraphic unit showed a higher contribution of algae precursor, whereas sediments of the Cucale unit suggested higher participation of microbiologically reworked OM. Most of the samples contained oil-prone kerogen type II. Maturity of the OM for sediments of the Prebreza unit ranged from immature to early-mature, while for samples of the Cucale unit varied from early-mature to mature stages. Distribution of hopane biomarkers typical for crude oil indicated that depth of 1 km was a boundary for the genesis of thermodynamic, more stable compounds. A significant portion of semifusinite was correlated with the paleofire event, which affected the distribution of n-alkanes. The high production of hydrocarbons was related to volcanic activity. Parameters, which proved to be highly susceptible at the stratigraphic boundary between the Prebreza and Cucale units, were C-value, S/H, α-MTTC, δ-MTTC, β-/γ-MTTC, and (1,3- + 1,6-)/(1,4 + 1,5-DMC), respectively.

中文翻译：

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古环境条件对塞尔维亚托普里克盆地西北部分沉积物中饱和烃和芳烃分布和相对丰度的影响

摘要 本研究的主要目的是研究古环境条件与特定饱和烃和芳香烃的分布和相对丰度之间的关系，从而确定对环境变化最敏感的参数。提供了关于有机质 (OM) 的类型、生成潜力和成熟度以及古气候条件的见解，以及 Toplica 盆地（塞尔维亚）西北部沉积环境的重建。对 Prebreza 和 Cucale 沉积单元的 40 个沉积物样品进行了有机岩相学、孢粉相、有机地球化学、矿物学和 XRF 分析。被调查样品存放于半干旱至半湿润/湿润气候条件下的盐水和缺氧环境中，随着火山碎屑物质的不断流入。层状水柱的 euxinic 部分中 δ-甲基三甲基三甲基色胺 (δ-MTTC) 的优势与盐度的增加有关，这在 Prebreza 单元的沉积物中被注意到。该地层单元的沉积物显示出藻类前体的更高贡献，而 Cucale 单元的沉积物表明微生物重新加工的 OM 参与度更高。大多数样品含有油性干酪根 II 型。Prebreza 单元沉积物 OM 的成熟度从未成熟到早熟不等，而 Cucale 单元的样品从早熟到成熟阶段不等。原油典型的藿烷生物标志物的分布表明，1 公里的深度是热力学更稳定化合物起源的边界。很大一部分半熔沸石与古火事件有关，这影响了正构烷烃的分布。碳氢化合物的高产量与火山活动有关。被证明在 Prebreza 和 Cucale 单元之间的地层边界处高度敏感的参数是 C 值、S/H、α-MTTC、δ-MTTC、β-/γ-MTTC 和 (1,3- + 1,6-)/(1,4 + 1,5-DMC)，分别。