Alt, Jeffrey C; Anderson, Thomas F; Bonnell, Linda (1989): (Table 1) Sulfur contents and isotope composition in rocks and minerals from DSDP/ODP Hole 504B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.707416, Supplement to: Alt, JC et al. (1989): The geochemistry of sulfur in a 1.3 km section of hydrothermally altered oceanic crust, DSDP Hole 504B. Geochimica et Cosmochimica Acta, 53(5), 1011-1023, https://doi.org/10.1016/0016-7037(89)90206-8
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Abstract:
DSDP Hole 504B is the only hole in oceanic crust to penetrate through the volcanic section and into hydrothermally altered sheeted dikes. We have carried out petrologic and sulfur isotopic analyses of sulfide and sulfate minerals and whole rocks from the core in order to place constraints on the geochemistry of sulfur during hydrothermal alteration of ocean crust.
The nearly 600 m-thick pillow section has lost sulfur to seawater and has net d34S = -1.8 per mil due to degassing of SO2 during crystallization and subsequent low temperature interaction with seawater. Hydrothermally altered rocks in the 200 m-thick transition zone are enriched in S and 34S (4300 ppm and +3.0 +/-1.2 per mil, respectively), whereas the more than 500 m of sheeted dikes contain 720 ppm S with d34S = +0.6 +/-1.4 per mil. These data are consistent with the presence of predominantly basaltic sulfur in hydrothermal fluids deep in the crust: following precipitation of anhydrite during seawater recharge, small amounts of seawater sulfate were reduced at temperatures >250°C through conversion of igneous pyrrhotite to secondary pyrite and minor oxidation of ferrous iron in the crust. The S- and 34S-enrichments of the transition zone are the results of seawater sulfate reduction and sulfide deposition during subsurface mixing between upwelling hot (up to 350°C) hydrothermal fluids and seawater. Seawater sulfate was probably reduced through oxidation of ferrous iron in hydrothermal fluids and in the transition zone rocks.
Alteration of the upper crust resulted in loss of basaltic sulfur to seawater, fixation of minor seawater sulfur in the crust and redistribution of magmatic sulfur within the crust. This caused net increases in sulfur content and d34S of the upper 1.8 km of the oceanic crust.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 1.227050 * Median Longitude: -83.730250 * South-bound Latitude: 1.226900 * West-bound Longitude: -83.730300 * North-bound Latitude: 1.227200 * East-bound Longitude: -83.730200
Date/Time Start: 1981-11-22T00:00:00 * Date/Time End: 1986-10-16T18:15:00
Minimum DEPTH, sediment/rock: 251.5 m * Maximum DEPTH, sediment/rock: 1275.5 m
Event(s):
83-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time Start: 1981-11-22T00:00:00 * Date/Time End: 1982-01-02T00:00:00 * Elevation: -3460.0 m * Penetration: 1350 m * Recovery: 107.7 m * Campaign: Leg83 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: Leg 83 of DSDP was devoted entirely to coring and experiments in Hole 504B, the deepest borehole to date into the oceanic crust. Hole 504B now extends over a kilometer into basement, nearly twice as far as any other DSDP hole, and it is the only DSDP hole to have clearly penetrated into the intrusive sheeted dikes that underlie the extrusive pillow lavas of the upper oceanic crust. At Hole 504B, Leg 83 continued an ongoing DSDP effort that began during Legs 68, 69, and 70 in 1979, and also included part of Leg 92 in 1983. 71 cores; 514 m cored; 0 m drilled; 21 % recovery
111-504B * Latitude: 1.226900 * Longitude: -83.730300 * Date/Time Start: 1986-10-05T11:45:00 * Date/Time End: 1986-10-16T18:15:00 * Elevation: -3474.0 m * Penetration: 1562.1 m * Recovery: 27.36 m * Location: North Pacific Ocean * Campaign: Leg111 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 209 m cored; 0 m drilled; 13.1 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Sample code/label | Sample label | Alt, Jeffrey C | DSDP/ODP/IODP sample designation | ||
| 4 | Rock type | Rock | Alt, Jeffrey C | |||
| 5 | Sample type | Samp type | Alt, Jeffrey C | |||
| 6 | Sulfur, total | TS | % | Alt, Jeffrey C | Coulometric titration | monosulfide |
| 7 | Sulfur, total | TS | % | Alt, Jeffrey C | Coulometric titration | pyrite |
| 8 | Sulfur, total | TS | % | Alt, Jeffrey C | Coulometric titration | sulfate |
| 9 | δ34S, sulfide | δ34S H2S | ‰ CDT | Alt, Jeffrey C | Isotope ratio mass spectrometry | for monosulfide S in bulk rock |
| 10 | δ34S, sulfide | δ34S H2S | ‰ CDT | Alt, Jeffrey C | Isotope ratio mass spectrometry | for sphalerite in veins |
| 11 | δ34S, sulfide | δ34S H2S | ‰ CDT | Alt, Jeffrey C | Isotope ratio mass spectrometry | for chalcopyrite in veins |
| 12 | δ34S, pyrite | δ34S Py | ‰ CDT | Alt, Jeffrey C | Isotope ratio mass spectrometry | in bulk rock |
| 13 | δ34S, pyrite | δ34S Py | ‰ CDT | Alt, Jeffrey C | Isotope ratio mass spectrometry | in veins |
| 14 | δ34S, sulfate | δ34S [SO4]2- | ‰ CDT | Alt, Jeffrey C | Isotope ratio mass spectrometry | in bulk rock |
| 15 | δ34S, sulfate | δ34S [SO4]2- | ‰ CDT | Alt, Jeffrey C | Isotope ratio mass spectrometry | for anhydrite in veins |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
326 data points