Data Description

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Citation:
Langrock, U et al. (2003): (Table 1) Organic and inorganic geochemical analysis of Late Jurassic to Early Cretaceous black shale sediments from the Norwegian-Greenland Seaway. doi:10.1594/PANGAEA.841464,
Supplement to: Langrock, Uwe; Stein, Ruediger; Lipinski, Marcus; Brumsack, Hans-Jürgen (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, doi:10.1029/2002PA000867
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):
IKU-13/1-U-02 * * Latitude: 57.811900 * Longitude: 8.203900 * Elevation: -505.0 m * Device: Drilling/drill rig (DRILL) *
IKU-6307/07-U-02 * * Latitude: 63.465100 * Longitude: 7.245600 * Elevation: -290.0 m * Device: Drilling/drill rig (DRILL) *
IKU-6814/04-U-02 * * Latitude: 68.662700 * Longitude: 14.163100 * Elevation: -233.0 m * Device: Drilling/drill rig (DRILL) *
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event label *Event
2Latitude of event *Latitude
3Longitude of event *Longitude
4Elevation of event *Elevationm
5DEPTH, sediment/rock *DepthmGeocode
6Depth, top/min *Depth topmLangrock, Uwe *
7Depth, bottom/max *Depth botmLangrock, Uwe *
8Stage *StageLangrock, Uwe *
9Carbon, total *TC%Langrock, Uwe *Element analyser CHN, LECO *
10Nitrogen, total *TN%Langrock, Uwe *Element analyser CHN, LECO *
11Sulphur, total *TS%Langrock, Uwe *Element analyser CHN, LECO *
12Calcium carbonate *CaCO3%Langrock, Uwe *Coulomat carbon analyzer *
13Iron oxide, Fe2O3 *Fe2O3%Langrock, Uwe *X-ray fluorescence (XRF) *
14Carbon, organic, total *TOC%Langrock, Uwe *Coulomat carbon analyzer *
15Hydrogen index, mass HC per unit mass total organic carbon *HI, HC/TOCmg/gLangrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
16Oxygen index, mass CO2 per unit mass total organic carbon *OI, CO2/TOCmg/gLangrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
17Pyrolysis temperature maximum *Tmax°CLangrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
18Hydrocarbon yield, S1 per unit sediment mass *S1/sedmg HC/gLangrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
19Hydrocarbon yield, S2 per unit sediment mass *S2/sedmg HC/gLangrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
20Carbon dioxide yield, S3 per unit sediment mass *S3/sedmg/gLangrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
21Hydrocarbon yield, S2/Carbon dioxide yield, S3 *S2/S3Langrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
22Production index, S1/(S1+S2) *PILangrock, Uwe *Rock eval pyrolysis (Espitalié et al. 1977) *
23Comment *CommentLangrock, Uwe *source rock potential
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Size:
267 data points

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