Swart, Peter K; Wortmann, Ulrich G; Mitterer, Richard M; Malone, Mitchell J; Smart, Peter L; Feary, David A; Hine, Albert C (2000): Maxima of interstitial water and gas parameters in ODP Leg 182 sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712096, Supplement to: Swart, PK et al. (2000): Hydrogen sulfide-hydrates and saline fluids in the continental margin of South Australia. Geology, 28(11), 1039-1042, https://doi.org/10.1130/0091-7613(2000)28%3C1039:HSASFI%3E2.0.CO;2
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
During the drilling of the southern Australian continental margin (Leg 182 of the Ocean Drilling Program), fluids with unusually high salinities (to 106‰) were encountered in Miocene to Pleistocene sediments. At three sites (1127, 1129, and 1131), high contents of H2S (to 15%), CH4 (50%), and CO2 (70%) were also encountered. These levels of H2S are the highest yet reported during the history of either the Deep Sea Drilling Project or the Ocean Drilling Program. The high concentrations of H2S and CH4 are associated with anomalous Na+/Cl- ratios in the pore waters. Although hydrates were not recovered, and despite the shallow water depth of these sites (200-400 m) and relative warm bottom water temperatures (11-14°C), we believe that these sites possess disseminated H2S-dominated hydrates. This contention is supported by calculations using the measured gas concentrations and temperatures of the cores, and depths of recovery. High concentrations of H2S necessary for the formation of hydrates under these conditions were provided by the abundant (SO4)2- caused by the high salinities of the pore fluids, and the high concentrations of organic material. One hypothesis for the origin of these fluids is that they were formed on the adjacent continental shelf during previous lowstands of sea level and were forced into the sediments under the influence of hydrostatic head.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -33.493249 * Median Longitude: 128.269996 * South-bound Latitude: -34.391083 * West-bound Longitude: 127.263983 * North-bound Latitude: -33.293117 * East-bound Longitude: 128.905250
Date/Time Start: 1998-10-26T00:00:00 * Date/Time End: 1998-12-01T00:00:00
Event(s):
182-1126 * Latitude: -33.509367 * Longitude: 128.066583 * Date/Time Start: 1998-10-26T00:00:00 * Date/Time End: 1998-10-30T00:00:00 * Elevation: -784.0 m * Penetration: 890.1 m * Recovery: 351 m * Location: Great Australian Bight * Campaign: Leg182 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 81 cores; 730.3 m cored; 150 m drilled; 48.1% recovery
182-1127 * Latitude: -33.357467 * Longitude: 128.481300 * Date/Time Start: 1998-10-30T00:00:00 * Date/Time End: 1998-11-03T00:00:00 * Elevation: -479.0 m * Penetration: 520.2 m * Recovery: 450.2 m * Location: Great Australian Bight * Campaign: Leg182 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 56 cores; 520.2 m cored; 0 m drilled; 86.6% recovery
182-1128 * Latitude: -34.391083 * Longitude: 127.590850 * Date/Time Start: 1998-11-03T00:00:00 * Date/Time End: 1998-11-11T00:00:00 * Elevation: -3874.8 m * Penetration: 982.9 m * Recovery: 552.8 m * Location: Indian Ocean * Campaign: Leg182 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 80 cores; 751.7 m cored; 231.2 m drilled; 73.5% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Swart, PK; Wortmann, UG; Mitterer, RM et al. (2000): (Table 1) The maximal ages, salinities, and alkalinities of ODP Leg 182 sediments. https://doi.org/10.1594/PANGAEA.712092
- Swart, PK; Wortmann, UG; Mitterer, RM et al. (2000): (Table 2) Maximum concentrations of gas and temperatures attained at ODP Leg 182 sites. https://doi.org/10.1594/PANGAEA.712095