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Langrock, Uwe; Stein, Ruediger; Lipinski, Marcus; Brumsack, Hans-Juergen (2003): Bulk geochemical and Rock-Eval data of sediment core IKU-7430/10-U-01 (Table 1). PANGAEA,, Supplement to: Langrock, U et al. (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,

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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.
Related to:
Langrock, Uwe (2003): Late Jurassic to Early Cretaceous black shale formation and paleoenvironment in high northern latitudes (Spätjurassische bis Frühkretazische Schwarzschiefergenese und Paläoumwelt in hohen nördlichen Breiten). Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 472, 144 pp,
Latitude: 74.216700 * Longitude: 30.233300
Minimum DEPTH, sediment/rock: 32.82 m * Maximum DEPTH, sediment/rock: 67.20 m
IKU-7430/10-U-01 * Latitude: 74.216700 * Longitude: 30.233300 * Elevation: -338.0 m * Method/Device: Drilling/drill rig (DRILL)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2Carbon, organic, totalTOC%Stein, RuedigerElement analyser CHN-O Rapid, Heraeus
3Carbon/Nitrogen ratioC/NStein, RuedigerCalculated
4Hydrogen index, mass HC per unit mass total organic carbonHI, HC/TOCmg/gStein, RuedigerRock eval pyrolysis (Behar et al., 2001)
5Oxygen index, mass CO2 per unit mass total organic carbonOI, CO2/TOCmg/gStein, RuedigerRock eval pyrolysis (Behar et al., 2001)
6Hydrocarbon yield, S1 per unit sediment massS1/sedmg HC/gStein, RuedigerRock eval pyrolysis (Behar et al., 2001)
7Hydrocarbon yield, S2 per unit sediment massS2/sedmg HC/gStein, RuedigerRock eval pyrolysis (Behar et al., 2001)
8Carbon dioxide yield, S3 per unit sediment massS3/sedmg CO2/gStein, RuedigerRock eval pyrolysis (Behar et al., 2001)
9Pyrolysis temperature maximumTmax°CStein, RuedigerRock eval pyrolysis (Behar et al., 2001)
10Carbon, totalTC%Stein, RuedigerElement analyser CHN, LECO
11Calcium carbonateCaCO3%Stein, RuedigerElement analyser CHN-O Rapid, Heraeus
12Carbon/sulfur ratioC/SStein, RuedigerCalculated
13Sulfur, totalTS%Stein, RuedigerElement analyser CHN-O Rapid, Heraeus
14Nitrogen, totalTN%Stein, RuedigerElement analyser CHN-O Rapid, Heraeus
1887 data points

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