de.pangaea.dataset779034 und dataset PANGAEA

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https://www.pangaea.de/ information pointOfContact 2026-05-01T03:25:15Z https://doi.pangaea.de/10.1594/PANGAEA.779034 1992-01-01 publication https://doi.org/10.1594/PANGAEA.779034 Alt, Jeffrey C author Burdett, James W author PANGAEA

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https://www.pangaea.de/ information publisher tableDigital Supplement to: Alt, Jeffrey C; Burdett, James W (1992): Sulfur in pacific deep-sea sediments (Leg 129) and implications for cycling of sediment in subduction zones. In: Larson, RL; Lancelot, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 129, 283-294, https://doi.org/10.2973/odp.proc.sr.129.125.1992 The mineralogy of S-bearing phases, S-contents, and S-isotopic compositions of sediments and interstitial waters were determined for three cores drilled during Leg 129 in the western Pacific. Pelagic clays, chalks, and radiolarites generally contain 350-1200 ppm S, with essentially all S present as sulfate. Volcanogenic turbidite units contain about 400 ppm S, with about 10%-20% of total sulfur as pyrite-S and the remainder as sulfate. A single claystone from the base of Hole 802A has high pyrite-S content (1200 ppm) and contains a component of metalliferous sediment. The single analyzed chert has the highest sulfur content (4020 ppm) with essentially all sulfur present as pyrite-S. Sulfate in pore waters ranges from seawater concentrations to nearly zero, and has d34S values ranging from seawater values (+20 per mil) to slightly enriched in 34S (+28 per mil). Pyrite sulfur has 34S values of -4.8 per mil to -37.1 per mil. These general trends are attributed to bacterial reduction of seawater sulfate, but the data do not fit simple models for downward diffusion of sulfate or closed-system reduction of buried sulfate. These complications are due to variations in the d34S of seawater sulfate in the past, uptake of sulfate by thaumasite (Ca3Si(OH)6CO3SO4-12H2O) without isotopic fractionation in the Unit II tuff in Hole 802A, the presence of cherts that act as barriers to diffusion, and possible variations in the magnitude of isotopic fractionation during bacterial sulfate reduction. The average sediment from Leg 129 contains around 850 ppm S (85% as sulfate, 15% as sulfide), with a bulk d34S of +12 per mil. The bulk sulfur isotopic composition of deep-sea sediment is highly dependent on the proportion of pyrite-sulfur present, which varies depending on the sedimentary environment and history. The sedimentary sulfur component during subduction thus likely varies from near seawater values (+20 per mil) to possibly strongly negative values (-20 per mil). completed Alt, Jeffrey C principalInvestigator ODP Ocean Drilling Program theme 1995-01-01 creation PANGAEA

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https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 152.3229 156.3598 12.0963 21.923 1989-11-26T02:45:00 1990-01-16T07:15:00 20.85 501.87 Event label thematicClassification Sample code/label thematicClassification DSDP/ODP/IODP sample designation Sample type thematicClassification DEPTH, sediment/rock physicalMeasurement mbsf m m Sulfate physicalMeasurement water soluble mg/kg mg/kg Sulfate physicalMeasurement acid soluble mg/kg mg/kg Sulfide physicalMeasurement acid solible mg/kg mg/kg Sulfur of pyrite physicalMeasurement mg/kg mg/kg Sulfur, total physicalMeasurement mg/kg mg/kg Sulfate physicalMeasurement interstitial water mg/kg mg/kg δ34S, sulfate physicalMeasurement water soluble ‰ CDT ‰ CDT δ34S, sulfate physicalMeasurement acid soluble ‰ CDT ‰ CDT δ34S, pyrite physicalMeasurement ‰ CDT ‰ CDT δ34S physicalMeasurement interstitial water ‰ CDT ‰ CDT δ34S physicalMeasurement mineral ‰ CDT ‰ CDT text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.779034?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 129-800A * LATITUDE: 21.923000 * LONGITUDE: 152.322900 * DATE/TIME START: 1989-11-26T02:45:00 * DATE/TIME END: 1989-12-05T20:27:00 * ELEVATION: -5697.0 m * PENETRATION: 544.4 m * RECOVERY: 150.73 m * LOCATION: North Pacific Ocean * CAMPAIGN: Leg129 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig 61 core; 544.4 m cored; 0 m drilled; 27.7 % recovery 1989-11-26T02:45:00 EVENT LABEL: 129-801A * LATITUDE: 18.642800 * LONGITUDE: 156.359500 * DATE/TIME START: 1989-12-06T17:15:00 * DATE/TIME END: 1989-12-09T17:00:00 * ELEVATION: -5685.0 m * PENETRATION: 194 m * RECOVERY: 31.49 m * LOCATION: North Pacific Ocean * CAMPAIGN: Leg129 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig 20 cores; 186 m cored; 0 m drilled; 16.9 % recovery 1989-12-06T17:15:00 EVENT LABEL: 129-801B * LATITUDE: 18.642000 * LONGITUDE: 156.359700 * DATE/TIME START: 1989-12-09T17:00:00 * DATE/TIME END: 1989-12-17T01:15:00 * ELEVATION: -5685.0 m * PENETRATION: 511.2 m * RECOVERY: 59.17 m * LOCATION: North Pacific Ocean * CAMPAIGN: Leg129 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig 44 cores; 317.2 m cored; 0 m drilled; 18.7 % recovery 1989-12-09T17:00:00 EVENT LABEL: 129-801C * LATITUDE: 18.642300 * LONGITUDE: 156.359800 * DATE/TIME START: 1990-01-06T11:48:00 * DATE/TIME END: 1990-01-16T07:15:00 * ELEVATION: -5685.0 m * PENETRATION: 594.3 m * RECOVERY: 60.6 m * LOCATION: North Pacific Ocean * CAMPAIGN: Leg129 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig 12 cores; 100.6 m cored; 0 m drilled; 60.2 % recovery 1990-01-06T11:48:00 EVENT LABEL: 129-802A * LATITUDE: 12.096300 * LONGITUDE: 153.210300 * DATE/TIME START: 1989-12-25T10:15:00 * DATE/TIME END: 1990-01-04T17:20:00 * ELEVATION: -5980.0 m * PENETRATION: 559.8 m * RECOVERY: 165.01 m * LOCATION: North Pacific Ocean * CAMPAIGN: Leg129 * BASIS: Joides Resolution * METHOD/DEVICE: Drilling/drill rig 62 cores; 559.8 m cored; 0 m drilled; 29.5 % recovery 1989-12-25T10:15:00