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Ikehara, Minoru; Kawamura, Kimitaka; Ohkouchi, Naohiko; Taira, Asahiko (1999): Organic geochemistry of ODP Hole 162-985A sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.805163, Supplement to: Ikehara, M et al. (1999): Organic geochemistry of greenish clay and organic-rich sediments since the early Miocene from Hole 985A, Norway Basin. In: Raymo, ME; Jansen, E; Blum, P; Herbert, TD (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 162, 1-8, https://doi.org/10.2973/odp.proc.sr.162.020.1999

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Abstract:
Dark, organic-rich sediments were recovered from the lower Miocene section (~16.6 Ma) in Hole 985A in the Norway Basin during Ocean Drilling Program Leg 162. Organic carbon and total sulfur contents of the dark sediments showed a maximum concentration of 5.6 and 26.1 wt%, respectively. Sulfur enrichment in the sediments indicates that these dark layers were formed under anoxic conditions in bottom water. Four dark and eight greenish gray sediment samples, ranging in age from early Miocene to Pleistocene, were analyzed for lipid-class compounds (aliphatic hydrocarbons, fatty alcohols, and sterols) using gas chromatography (GC) and GC/mass spectrometry to better understand the formation processes of the organic-rich dark layers and to reconstruct the paleoenvironmental changes. The molecular distributions of n-alkanes and fatty alcohols indicate that terrigenous organic matter largely contributed to both types of sediments. Significant amounts of hopanoid hydrocarbons, such as diploptene and hop-17(21)-ene, however, were detected characteristically in the dark sediments, which suggests that prokaryotes such as methane-oxidizing bacteria or cyanobacteria may have significantly contributed to the formation of these organic-rich, dark sediments. These results indicate that the bottom waters of the Norway Basin had been subjected to anoxic conditions during the early Miocene.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 66.941400 * Longitude: -6.450300
Date/Time Start: 1995-08-03T13:58:00 * Date/Time End: 1995-08-07T04:15:00
Event(s):
162-985A * Latitude: 66.941400 * Longitude: -6.450300 * Date/Time Start: 1995-08-03T13:58:00 * Date/Time End: 1995-08-07T04:15:00 * Elevation: -2788.0 m * Penetration: 587.9 m * Recovery: 553.42 m * Location: Norwegian Sea * Campaign: Leg162 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 587.9 m cored; 0 m drilled; 94.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Ikehara, M; Kawamura, K; Ohkouchi, N et al. (1999): (Table 4) Content of hopanoid hydrocarbons in ODP Hole 162-985A sediments. https://doi.org/10.1594/PANGAEA.805162
  2. Ikehara, M; Kawamura, K; Ohkouchi, N et al. (1999): (Table 2) Hydrocarbon content of ODP Hole 162-985A sediments. https://doi.org/10.1594/PANGAEA.805160
  3. Ikehara, M; Kawamura, K; Ohkouchi, N et al. (1999): (Table 3) n-Fatty alcohols and sterols content of ODP Hole 162-985A sediments. https://doi.org/10.1594/PANGAEA.805161
  4. Ikehara, M; Kawamura, K; Ohkouchi, N et al. (1999): (Table 1) Organic carbon, total nitrogen and total sulphur content of ODP Hole 162-985A sediments. https://doi.org/10.1594/PANGAEA.805159