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Böttcher, Michael Ernst; Ferdelman, Timothy G; Jørgensen, Bo Barker; Blake, Ruth E; Surkov, Alexander V; Claypool, George E (2006): (Table T2) Sulfur isotopes of pore water from ODP Leg 201 sites. PANGAEA,, Supplement to: Böttcher, ME et al. (2006): Sulfur isotope fractionation by the deep biosphere within sediments of the eastern equatorial Pacific and Peru margin. In: Jørgensen, BB; D'Hondt, SL; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 201, 1-21,

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Fifty-seven interstitial water samples from six sites (Ocean Drilling Program Sites 1225-1229 and 1231) in the eastern equatorial Pacific Ocean and the Peru margin were analyzed for the stable sulfur isotopic composition (34S/32S) of dissolved sulfate along with major and minor ions. With the exception of Site 1231, sulfate from the interstitial fluids (d34S values as much as 89 per mil vs. the SF6-based Vienna-Canyon Diablo troilite standard) is found at depth to be enriched in 34S with respect to modern seawater sulfate (d34S = ~21 per mil), indicating that microbial sulfate reduction (MSR) took place to different extents at all investigated sites. Deeper sediments at Sites 1228 and 1229 are additionally influenced by diffusion of a sulfate-rich brine that has already undergone sulfate reduction. The intensity of MSR depends on the availability of substrate (organic matter), sedimentation conditions, and the active bacterial community structure. Formation of isotopically heavy diagenetic barite at the sulfate-methane transition zone is expected at Sites 1227 (one front), 1229 (two fronts), and probably Site 1228. At Site 1231, the constant sulfur isotopic composition of sulfate and concentrations of minor pore water ions indicate that suboxic (essentially iron and manganese oxide based) diagenesis dominates and no net MSR occurs.
Median Latitude: -7.928946 * Median Longitude: -84.664817 * South-bound Latitude: -12.021060 * West-bound Longitude: -110.571480 * North-bound Latitude: 2.770780 * East-bound Longitude: -77.957650
Date/Time Start: 2002-02-07T21:15:00 * Date/Time End: 2002-03-21T16:00:00
Minimum Elevation: -4813.7 m * Maximum Elevation: -152.2 m
201-1225A * Latitude: 2.770780 * Longitude: -110.571480 * Date/Time Start: 2002-02-07T21:15:00 * Date/Time End: 2002-02-11T11:10:00 * Elevation: -3761.3 m * Penetration: 319.6 m * Recovery: 321.65 m * Location: North Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 315.6 m cored; 4 m drilled; 101.9 % recovery
201-1226B * Latitude: -3.094480 * Longitude: -90.817980 * Date/Time Start: 2002-02-19T19:55:00 * Date/Time End: 2002-02-23T10:45:00 * Elevation: -3297.0 m * Penetration: 421.4 m * Recovery: 413.69 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 47 cores; 418.9 m cored; 2.5 m drilled; 98.8 % recovery
201-1227A * Latitude: -8.991050 * Longitude: -79.955830 * Date/Time Start: 2002-02-28T13:00:00 * Date/Time End: 2002-03-02T05:50:00 * Elevation: -427.5 m * Penetration: 151.1 m * Recovery: 100.51 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 151.1 m cored; 0 m drilled; 66.5 % recovery
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Sample code/labelSample labelBöttcher, Michael ErnstDSDP/ODP/IODP sample designation
3δ34S, sulfateδ34S [SO4]2-‰ CDTBöttcher, Michael ErnstIsotope ratio monitoring (IRM) mass spectrometry
112 data points

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