Berner, Ulrich; Bertrand, Philippe (1991): Light hydrocarbons in sediments of ODP Site 124-768 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.762055, Supplement to: Berner, U; Bertrand, P (1991): Light hydrocarbons in sediments of the Sulu Sea Basin (Site 768): genetic characterization by molecular and stable isotope composition. In: Silver, EA; Rangin, C; von Breymann, MT; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 124, 227-231, https://doi.org/10.2973/odp.proc.sr.124.157.1991
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Abstract:
Geochemical investigations on gases and interstitial waters from ODP Site 768 (Sulu Trench/Philippines) demonstrate the application of molecular gas composition in combination with stable isotope analyses to the genetic classification of light hydrocarbons. 13C/12C and D/H ratios of methane from gas pockets in cores and gases desorbed from frozen sediments by a vacuum/acid treatment suggest a microbial generation of methane by a CO2 reducing process in sediments with low sulfate concentrations. Isotope data and molecular composition of sediment gases liberated by the vacuum/acid treatment seem to be affected by a secondary desorption process during sampling. A comparison between the D/H ratios of methane from gas pockets and interstitial H2O points to an in-situ generation of methane down to a sub-bottom depth of approx. 720 m. Below this depth hydrogen isotope data indicate a migration of light hydrocarbons into pyroclastic sediments at this site. The occurrence of higher hydrocarbons (propane to pentane) in gases from gas pockets coincides with the vertical distribution of mature organic matter. Gases within the zone of mature organic matter are gases of a mixed microbial and thermal origin.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 8.000000 * Longitude: 121.219800
Date/Time Start: 1988-11-28T10:45:00 * Date/Time End: 1988-12-13T07:00:00
Event(s):
124-768B * Latitude: 8.000000 * Longitude: 121.219800 * Date/Time Start: 1988-11-28T10:45:00 * Date/Time End: 1988-11-28T21:30:00 * Elevation: -4396.0 m * Penetration: 364.1 m * Recovery: 293.79 m * Location: Sulu Sea * Campaign: Leg124 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 364.1 m cored; 0 m drilled; 80.7 % recovery
124-768C * Latitude: 8.000000 * Longitude: 121.219800 * Date/Time Start: 1988-12-01T14:30:00 * Date/Time End: 1988-12-13T07:00:00 * Elevation: -4396.0 m * Penetration: 1268.5 m * Recovery: 525.69 m * Location: Sulu Sea * Campaign: Leg124 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 100 cores; 915 m cored; 0 m drilled; 57.5 % 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
- Berner, U; Bertrand, P (1991): (Table 3) Hydrogen isotope ratios from pore waters in ODP Site 124-768. https://doi.org/10.1594/PANGAEA.762054
- Berner, U; Bertrand, P (1991): (Table 2) Molecular composition and isotope ratios of total gases in ODP Site 124-768. https://doi.org/10.1594/PANGAEA.762053
- Berner, U; Bertrand, P (1991): (Table 1) Molecular composition and isotope ratios of methane from gas pockets of ODP Hole 124-768C. https://doi.org/10.1594/PANGAEA.762052