Bulk geochemical and Rock-Eval data of sediment core IKU-7430/10-U-01 (Table 1), supplement to: Langrock, Uwe; Stein, Ruediger; Lipinski, Marcus; Brumsack, Hans-Jürgen (2003): Paleoenvironment and sea-level change in the early Cretaceous Barents Sea – implications from near-shore marine sapropels. Geo-Marine Letters, 23(1), 34-42

• Main Authors: Langrock, Uwe, Stein, Ruediger, Lipinski, Marcus, Brumsack, Hans-Jürgen
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2003
• Subjects: DEPTH, sediment/rock; Carbon, organic, total; Carbon/Nitrogen ratio; Hydrogen index, mass HC per unit mass total organic carbon; Oxygen index, mass CO2 per unit mass total organic carbon; Hydrocarbon yield, S1 per unit sediment mass; Hydrocarbon yield, S2 per unit sediment mass; Carbon dioxide yield, S3 per unit sediment mass; Pyrolysis temperature maximum; Carbon, total; Calcium carbonate; Carbon/sulfur ratio; Sulfur, total; Nitrogen, total; Drilling/drill rig; Element analyser CHN-O Rapid, Heraeus; Calculated; Rock eval pyrolysis Behar et al., 2001; Element analyser CHN, LECO; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Barents Sea; Hekkingen
• Online Access: https://dx.doi.org/10.1594/pangaea.143840; https://doi.pangaea.de/10.1594/PANGAEA.143840

The late Volgian (early "Boreal" Berriasian) sapropels of the Hekkingen Formation of the central Barents Sea show total organic carbon (TOC) contents from 3 to 36 wt%. The relationship between TOC content and sedimentation rate (SR), and the high Mo/Al ratios indicate deposition under oxygen-free bottom-water conditions, and suggest that preservation under anoxic conditions has largely contributed to the high accumulation of organic carbon. Hydrogen index values obtained from Rock-Eval pyrolysis are exceptionally high, and the organic matter is characterized by well-preserved type II kerogen. However, the occurrence of spores, freshwater algae, coal fragments, and charred land-plant remains strongly suggests proximity to land. Short-term oscillations, probably reflecting Milankovitch-type cyclicity, are superimposed on the long-term trend of constantly changing depositional conditions during most of the late Volgian. Progressively smaller amounts of terrestrial organic matter and larger amounts of marine organic matter upwards in the core section may have been caused by a continuous sea-level rise.