{'fraction_non_alphanumeric': 0.036685641998734975, 'fraction_numerical': 0.012017710309930424, 'mean_word_length': 4.859259259259259, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Early to Middle Jurassic redox evolution across the Norwegian Continental Shelf: a case study in the Viking Corridor, North Sea Basin

We present new carbon isotope ( δ 13 C), redox-sensitive trace metal (RSTM), and Hg records from the Viking Corridor— Norwegian Continental Shelf (NCS)—to assess the spatial and temporal evolution of redox conditions between Early-Middle Jurassic (186-169 Ma). We assess a global and a regional event —the Toarcian Oceanic Anoxic Event (T-OAE) and the localized uplift of the North Sea Dome (NSD; ~182-170 Ma), respectively. The T-OAE is characterized by a global warming event and a perturbation of the carbon cycle—expressed as a negative δ 13 C shift—linked to CO 2 release from the Karoo-Ferrar LIP (KF-LIP). The NSD acted as a large bathymetric barrier, disrupting regional paleocurrents and basin architecture. Despite extensive studies of the T-OAE, its expression across the NCS is still limited. Similarly, while we understand the role that the NSD played in the tectonostratigraphic configuration of the NCS, the impact on redox conditions during its onset and evolution remains elusive. The scarcity of continuous Early-Middle Jurassic geochemical records has contributed to this gap —the focus of this study. Results confirm the T-OAE presence with a negative δ 13 C excursion that coincides with the onset of KF-LIP along with elevated Hg and RSTM. Our data demonstrates a spatial Hg trend across the basin, where proximal settings are elevated in Hg and RSTM. Temporally, in proximal settings, post-T-OAE successions are Hg-enriched