Abstract The distributions and concentrations of polycyclic aromatic hydrocarbons (PAHs) and plant-derived aromatic biomarkers were analysed in Middle Jurassic strata from central Poland. These compounds were abundant in all samples indicating the occurrence of specific palaeoflora families and the intensity of palaeo-wildfires. Moreover, calculated fusinite reflectance values revealed that the temperature of Middle Jurassic wildfires may have exceeded 950 °C, consistent with high oxygen concentrations in the atmosphere during this period. The high content of charred organic matter has an influence on certain biomarker maturity indicators based on terrestrial organic matter such as C29 20S/(S + R). A new indicator was developed, benzo[ghi]perylene/(perylene + benzo[ghi]perylene), abbreviated as BgP/(Per + BgP, high values of which are characteristic of samples in which terrestrial organic matter is mostly charred. The use of this indicator is limited to immature organic matter, since perylene disappears when vitrinite reflectance is higher than 0.7 %Ro. Measurements of vitrinite reflectance indicated that Middle Jurassic organic matter with a reflectance value 0.5 are correlated with lower mHPI values. This is evidence for the transport of wildfire products by rivers, wind, and/or sea currents over large distances. Tracers for conifers, non-vascular plants, and fungi were identified.

中文翻译：

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波兰盆地中侏罗世沉积物中的多环芳烃为高温古野火提供证据

摘要 分析了波兰中部中侏罗统地层中多环芳烃（PAHs）和植物来源的芳香生物标志物的分布和浓度。这些化合物在所有样品中都很丰富，表明特定古植物群的发生和古野火的强度。此外，计算出的fusinite反射率值显示中侏罗世野火的温度可能已超过950°C，与此期间大气中的高氧浓度一致。炭化有机质含量高对某些基于陆地有机质的生物标志物成熟度指标如C29 20S/(S+R)有影响。开发了一种新的指示剂，苯并[ghi]苝/（苝+苯并[ghi]苝），缩写为BgP/(Per + BgP, 其高值是陆地有机物大部分被烧焦的样品的特征。该指示剂的使用仅限于未成熟的有机物，因为当镜质体反射率高于 0.7%Ro 时苝消失。镜质体反射率的测量表明，反射率为 0.5 的中侏罗纪有机质与较低的 mHPI 值相关。这是野火产物通过河流、风和/或海流远距离运输的证据。确定了针叶树、非维管植物和真菌的示踪剂。镜质体反射率的测量表明，反射率为 0.5 的中侏罗纪有机质与较低的 mHPI 值相关。这是野火产物通过河流、风和/或海流远距离运输的证据。确定了针叶树、非维管植物和真菌的示踪剂。镜质体反射率的测量表明，反射率为 0.5 的中侏罗纪有机质与较低的 mHPI 值相关。这是野火产物通过河流、风和/或海流远距离运输的证据。确定了针叶树、非维管植物和真菌的示踪剂。