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Schaefer, Rainer G; Littke, Ralf; Leythaeuser, Detlev (1991): Low-molecular-weight hydrocarbons in sediments of Broken Ridge and Ninetyeast Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.760424, Supplement to: Schaefer, RG et al. (1991): Low-molecular-weight hydrocarbons in sediments of Sites 752, 754, 755 (Broken Ridge), 757, and 758 (Ninetyeast Ridge), central Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 457-466, https://doi.org/10.2973/odp.proc.sr.121.176.1991

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Abstract:
Core samples taken during Leg 121 drilling aboard the JOIDES Resolution in the central Indian Ocean were analyzed for their low-molecular-weight hydrocarbon contents. Forty-three samples from the Broken Ridge and 39 samples from the Ninetyeast Ridge drill sites, deep-frozen on board immediately after recovery, were studied by a dynamic headspace technique (hydrogen-stripping/thermovaporization). Light hydrocarbons (saturated and olefinic) with two to four carbon atoms, and toluene as a selected aromatic compound, were identified. Total C2-C4 saturated hydrocarbon yields vary considerably from virtually zero in a Paleogene calcareous ooze from Hole 757B to nearly 600 nanogram/gram of dry-weight sediment (parts per billion) in a Cretaceous claystone from Hole 758A. An increase of light-hydrocarbon yields with depth, and hence with sediment temperature, was observed from Hole 758A samples down to a depth of about 500 meters below seafloor. Despite extreme data scatter due to lithological changes over this depth interval, this increased yield indicates the onset of temperature-controlled hydrocarbon formation reactions.
Toluene contents are also extremely variable (generally between 10 and 100 ppb) and reach more than 300 ppb in two samples of tuffaceous lithology (Sections 121-755A-17R-4 and 121-758A-48R-4). As for the saturated hydrocarbons, there was also an increase of toluene yields with increasing depth in Hole 758A.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -18.651036 * Median Longitude: 90.461495 * South-bound Latitude: -31.030000 * West-bound Longitude: 88.181600 * North-bound Latitude: 5.384200 * East-bound Longitude: 93.578000
Date/Time Start: 1988-05-10T03:15:00 * Date/Time End: 1988-06-24T13:30:00
Event(s):
121-752A * Latitude: -30.891000 * Longitude: 93.578000 * Date/Time Start: 1988-05-10T03:15:00 * Date/Time End: 1988-05-12T13:55:00 * Elevation: -1097.0 m * Penetration: 317.6 m * Recovery: 217.32 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 34 cores; 317.6 m cored; 0 m drilled; 68.4 % recovery
121-752B * Latitude: -30.891000 * Longitude: 93.577500 * Date/Time Start: 1988-05-18T09:00:00 * Date/Time End: 1988-05-22T12:30:00 * Elevation: -1097.0 m * Penetration: 435.6 m * Recovery: 112.34 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 158 m cored; 0 m drilled; 71.1 % recovery
121-754A * Latitude: -30.941000 * Longitude: 93.566500 * Date/Time Start: 1988-05-13T18:30:00 * Date/Time End: 1988-05-15T05:15:00 * Elevation: -1075.0 m * Penetration: 172.1 m * Recovery: 128.27 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 170 m cored; 0 m drilled; 75.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Schaefer, RG; Littke, R; Leythaeuser, D (1991): (Table 2) Organic carbon contents in ODP Hole 121-752A. https://doi.org/10.1594/PANGAEA.760394
  2. Schaefer, RG; Littke, R; Leythaeuser, D (1991): (Table 1) Thermovaporization hydrocarbon yield as function of temperature of an ODP Hole 121-757B sample. https://doi.org/10.1594/PANGAEA.760390
  3. Schaefer, RG; Littke, R; Leythaeuser, D (1991): (Table 3) Low-molecular-weight hydrocarbon yield from selected ODP Leg121 samples. https://doi.org/10.1594/PANGAEA.760410