Langrock, Uwe; Stein, Ruediger; Lipinski, Marcus; Brumsack, Hans-Jürgen (2003): (Table 1) Organic and inorganic geochemical analysis of Late Jurassic to Early Cretaceous black shale sediments from the Norwegian-Greenland Seaway [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.841464, Supplement to: Langrock, U et al. (2003): Late Jurassic to Early Cretaceous black shale formation and paleoenvironment in high northern latitudes: Examples from the Norwegian-Greenland Seaway. Paleoceanography, 18(3), 1074, https://doi.org/10.1029/2002PA000867
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Abstract:
The Late Jurassic to Early Cretaceous (Volgian-Ryazanian) was a period of a second-order sea-level low stand, and it provided excellent conditions for the formation of shallow marine black shales in the Norwegian-Greenland Seaway (NGS). IKU Petroleum Research drilling cores taken offshore along the Norwegian shelf were investigated with geochemical and microscopic approaches to (1) determine the composition of the organic matter, (2) characterize the depositional environments, and (3) discuss the mechanisms which may have controlled production, accumulation, and preservation of the organic matter. The black shale sequences show a wide range of organic carbon contents (0.5-7.0 wt %) and consist of thermally immature organic matter of type II to II/III kerogen. Rock-Eval pyrolysis revealed fair to very good petroleum source rock potential, suggesting a deposition in restricted shallow marine basins. Well-developed lamination and the formation of autochthonous pyrite framboids further indicate suboxic to anoxic bottom water conditions. In combination with very low sedimentation rates it seems likely that preservation was the principal control on organic matter accumulation. However, a decrease of organic carbon preservation and an increase of refractory organic matter from the Volgian to the Hauterivian are superimposed on short-term variations (probably reflecting Milankovitch cycles). Various parameters indicate that black shale formation in the NGS was gradually terminated by increased oxidative conditions in the course of a sea-level rise.
Project(s):
Coverage:
Median Latitude: 63.313233 * Median Longitude: 9.870867 * South-bound Latitude: 57.811900 * West-bound Longitude: 7.245600 * North-bound Latitude: 68.662700 * East-bound Longitude: 14.163100
Minimum DEPTH, sediment/rock: 23.0 m * Maximum DEPTH, sediment/rock: 180.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Depth, top/min | Depth top | m | Langrock, Uwe | ||
| 7 | Depth, bottom/max | Depth bot | m | Langrock, Uwe | ||
| 8 | Stage | Stage | Langrock, Uwe | |||
| 9 | Carbon, total | TC | % | Langrock, Uwe | Element analyser CHN, LECO | |
| 10 | Nitrogen, total | TN | % | Langrock, Uwe | Element analyser CHN, LECO | |
| 11 | Sulfur, total | TS | % | Langrock, Uwe | Element analyser CHN, LECO | |
| 12 | Calcium carbonate | CaCO3 | % | Langrock, Uwe | Coulomat carbon analyzer | |
| 13 | Iron oxide, Fe2O3 | Fe2O3 | % | Langrock, Uwe | X-ray fluorescence (XRF) | |
| 14 | Carbon, organic, total | TOC | % | Langrock, Uwe | Coulomat carbon analyzer | |
| 15 | Hydrogen index, mass HC, per unit mass total organic carbon | HI, HC/TOC | mg/g | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | |
| 16 | Oxygen index, mass CO2, per unit mass total organic carbon | OI, CO2/TOC | mg/g | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | |
| 17 | Pyrolysis temperature maximum | Tmax | °C | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | |
| 18 | Hydrocarbon yield, S1 per unit sediment mass | S1 HC/sed | mg/g | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | |
| 19 | Hydrocarbon yield, S2 per unit sediment mass | S2 HC/sed | mg/g | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | |
| 20 | Carbon dioxide yield, S3 per unit sediment mass | S3 CO2/sed | mg/g | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | |
| 21 | Hydrocarbon yield, S2/Carbon dioxide yield, S3 | S2/S3 | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | ||
| 22 | Production index, S1/(S1+S2) | PI | Langrock, Uwe | Rock eval pyrolysis (Espitalié et al. 1977) | ||
| 23 | Comment | Comment | Langrock, Uwe | source rock potential |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
267 data points