During the Early Toarcian, deposition of organic carbon-rich-shales occurred throughout the epicontinental sea across Europe. Climate instability and high extinction rates in the marine realm were associated with profound environmental changes. The Toarcian Oceanic Anoxic Event (T-OAE) has been linked to the injection of greenhouse gases (e.g. oceanic methane) into the atmosphere triggered by the emplacement of the Karoo-Ferrar large igneous province (LIP) volcanism. The data presented are obtained from the Posidonia Shale Formation in Dormettingen (southwestern Germany), ~2 km from the well-known Dotternhausen section. Despite the intense palaeontological and geochemical research, studies on the particulate organic matter (POM) across the T-OAE are scarce. Here, we provide a detailed study of POM of the Dormettingen section as a tool to evaluate changes in the depositional environment. Integrated POM (i.e. amorphous organic matter, marine and terrestrial palynomorphs) and geochemical (i.e. carbon isotope δ¹³C) analyses reveal different episodes of palaeoecological upheavals during the studied time interval. In this study, we will integrate new palynofacies data and combine it with the existing sedimentological and palaeoecological data of Dotternhausen in order to interpret relative sea-level fluctuations and climatic changes at the local palaeogeographic setting.

在早Toarcian期间，整个欧洲的上陆海域都发生了富含有机碳页岩的沉积。海洋领域的气候不稳定和高灭绝率与深刻的环境变化有关。Toarcian海洋缺氧事件（T-OAE）与由Karoo-Ferrar大火成岩省（LIP）火山爆发触发的向大气中注入温室气体（例如海洋甲烷）有关。给出的数据是从距著名的Dotternhausen断层约2 km的Dormettingen（德国西南部）的Posidonia页岩组获得的。尽管进行了古生物学和地球化学方面的深入研究，但对跨T-OAE的颗粒有机物（POM）的研究却很少。这里，我们提供了Dormettingen部分的POM的详细研究，以此作为评估沉积环境变化的工具。综合的POM（即无定形有机物，海洋和陆地的地貌）和地球化学（即碳同位素δ¹³ C）分析揭示了在研究的时间间隔内古生态动荡的不同发作。在这项研究中，我们将整合新的古相数据并将其与Dotternhausen的现有沉积学和古生态学数据相结合，以解释当地古地理环境中的相对海平面波动和气候变化。