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Hölemann, Jens A; Henrich, Rüdiger (1994): (Table 1) Maceral composition and organic carbon chemistry of ODP Leg 104 samples. PANGAEA, https://doi.org/10.1594/PANGAEA.758978, Supplement to: Hölemann, JA; Henrich, R (1994): Allochthonous versus autochthonous organic matter in Cenozoic sediments of the Norwegian Sea: Evidence for the onset of glaciations in the northern hemisphere. Marine Geology, 121(1-2), 87-103, https://doi.org/10.1016/0025-3227(94)90159-7

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Abstract:
The Cenozoic sediments sampled in ODP Leg 104 on the Vøring Plateau show a distinct variability of the total organic carbon content (TOC) and the accumulation rates of TOC. Based on the geochemical and organic-petrographic characterization of the sedimentary organic matter (OM), the allochthonous and autochthonous proportion of the OM could be quantified.
The results clearly demonstrate that high TOC percentages and TOC accumulation rates in Cenozoic sediment sections display a generally high input of allochthonous organic matter. Oxidized and partly well-rounded organic particles built up the main portion of OM within the Miocene, TOC-rich sediments. The most probable source of this oxidized OM are reworked sediments from the Scandinavian shelf. Changes in the input of these organic particles are to some degree correlative with sea-level changes.
The Cenozoic accumulation of autochthonous OM is low and does not reveal a clear variation during the Miocene and early Pliocene. In spite of a high accumulation rate of biogenic opal during the Early Miocene, the accumulation rate of autochthonous TOC is low. The autochthonous particle assemblage is dominated by relatively inert OM, like dinoflagellate cysts. This points to an intensive biological and/or early diagenetic degradation of the marine OM under well oxidized bottom water conditions during the last 23 Myr. Nevertheless, a continuation of marine OM degradation during later stages of diagenesis cannot be excluded.
A prominent dominance of allochthonous OM over autochthonous is documented with the beginning of the Pliocene. At 2.45 Ma the episodic occurrence of ice-rafted, thermally mature OM reflects the onset of the glacial erosion of Mesozoic, coal and black shale bearing sediments on the Scandinavian and Barents Sea shelves. The first occurrence of these, in view of the actual burial depth, thermally overmature OM particles is, therefore, a marker for the beginning of the strong Scandinavian glaciation and the advance of the glacial front toward the shelves.
Project(s):
Coverage:
Median Latitude: 67.206100 * Median Longitude: 2.846100 * South-bound Latitude: 66.678300 * West-bound Longitude: 1.033300 * North-bound Latitude: 67.715000 * East-bound Longitude: 4.576700
Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-08-09T10:15:00
Minimum Elevation: -2780.0 m * Maximum Elevation: -1226.0 m
Event(s):
104-642B * Latitude: 67.225000 * Longitude: 2.928300 * Date/Time Start: 1985-06-28T14:40:00 * Date/Time End: 1985-06-29T20:15:00 * Elevation: -1294.0 m * Penetration: 221.1 m * Recovery: 214.61 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 221.1 m cored; 0 m drilled; 97.1 % recovery
104-643A * Latitude: 67.715000 * Longitude: 1.033300 * Date/Time Start: 1985-08-03T06:07:00 * Date/Time End: 1985-08-08T01:45:00 * Elevation: -2780.0 m * Penetration: 565.2 m * Recovery: 458.29 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 565.2 m cored; 0 m drilled; 81.1 % recovery
104-644A * Latitude: 66.678300 * Longitude: 4.576700 * Date/Time Start: 1985-08-08T11:30:00 * Date/Time End: 1985-08-09T10:15:00 * Elevation: -1226.0 m * Penetration: 252.8 m * Recovery: 238.67 m * Location: Norwegian Sea * Campaign: Leg104 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 34 cores; 252.8 m cored; 0 m drilled; 94.4 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelHölemann, Jens AODP sample designation
3AGEAgeka BPGeocode
4Facies name/codeFaciesHölemann, Jens A
5Isotopic eventIsotopic eventHölemann, Jens A
6Carbon, organic, totalTOC%Hölemann, Jens AElement analyser CHN, LECO CS 125
7Hydrogen index, mass HC per unit mass total organic carbonHI, HC/TOCmg/gHölemann, Jens ARock eval pyrolysis (Behar et al., 2001)
8Temperature, in rock/sediment, maximumt max°CHölemann, Jens ARock eval pyrolysis (Behar et al., 2001)
9LiptodetriniteLiptodetrinite%Hölemann, Jens AFluorescent microscopeliptodetrinite + bituminite (grain%)
10AlginiteAlginite%Hölemann, Jens AFluorescent microscopealginite (grain%)
11DetriniteDetrinite%Hölemann, Jens AFluorescent microscopedetrinite (grain%)
12VitriniteVitr%Hölemann, Jens AFluorescent microscopevitrinite + inertinite (grain%)
13SporiniteSporinite%Hölemann, Jens AFluorescent microscopesporinite + cutinite (grain%)
14Coal clasts or fragmentsCoal clasts%Hölemann, Jens AFluorescent microscopeCoal-clasts (grain%)
Size:
36 data points

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