Alt, Jeffrey C; Saltzman, Eric S; Price, David A (1985): (Table 1) Sulfur isotopes and description of anhydrite in DSDP Holes 70-504B and 83-504B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.805001, Supplement to: Alt, JC et al. (1985): Anhydrite in hydrothermally altered basalts: Deep Sea Drilling Project Hole 504B, Leg 83. In: Anderson, RN; Honnorez, J; Becker, K; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 83, 283-288, https://doi.org/10.2973/dsdp.proc.83.111.1985
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Abstract:
Anhydrite occurs in veins in hydrothermally altered basalts recovered from Hole 504B during Leg 83 of the Deep Sea Drilling Project. Sulfur isotopic data indicate that the anhydrites formed from fluids with sulfur isotopic compositions similar to seawater sulfate. Anhydrite probably formed as a pulse of relatively unreacted seawater was heated when it entered a relatively hot hydrothermal system containing evolved fluids. Reheating and continued evolution of the system followed anhydrite deposition.
Preservation of anhydrite in Hole 504B was probably favored by the high temperatures and by the low permeability that resulted from the sealing of cracks with secondary minerals. Evidence also indicates that anhydrite was partly replaced by laumontite and prehnite at relatively high temperatures, and possibly by calcite at lower temperatures.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 1.227100 * Median Longitude: -83.730100 * South-bound Latitude: 1.227000 * West-bound Longitude: -83.730200 * North-bound Latitude: 1.227200 * East-bound Longitude: -83.730000
Date/Time Start: 1979-12-04T00:00:00 * Date/Time End: 1982-01-02T00:00:00
Minimum DEPTH, sediment/rock: 584.0 m * Maximum DEPTH, sediment/rock: 1346.2 m
Event(s):
70-504B * Latitude: 1.227000 * Longitude: -83.730000 * Date/Time: 1979-12-04T00:00:00 * Elevation: -3460.0 m * Penetration: 836.1 m * Recovery: 91.6 m * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 328.6 m cored; 18.5 m drilled; 27.9 % recovery
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
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Alt, Jeffrey C | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 4 | δ34S | δ34S | ‰ CDT | Alt, Jeffrey C | Mass spectrometer VG Micromass 602 | |
| 5 | Description | Description | Alt, Jeffrey C | |||
| 6 | Description 2 (continued) | Description 2 | Alt, Jeffrey C | |||
| 7 | Rock type | Rock | Alt, Jeffrey C |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
38 data points
Data
| 1 Event | 2 Sample label | 3 Depth sed [m] | 4 δ34S [‰ CDT] | 5 Description | 6 Description 2 | 7 Rock |
|---|---|---|---|---|---|---|
| 70-504B | 70-504B-40-3,130-135 | 584.0 | 18.9 | Anhydrite with calcite in cm-sized vug lined with saponite. Doleritic host rock contains reddish oxidation halo with ferric oxides replacing primary sulfides and olivine | Contains smectite | |
| 70-504B | 70-504B-48-3,14-18 | 650.0 | 36.7 | Anhydrite prisms, up to 5 mm long, are intergrown with gyrolite at the center of a 5-mm-wide vein smectite rimmed by saponite and quartz in a dark gray host rock | Contains smectite | |
| 83-504B | 83-504B-72-2,126-129 | 846.3 | Radiating laths of anhydrite, up to a few mm long, at the center of a clay mineral vein in a dark gray host rock | Contains sphene + smectite with minor chlorite layers | ||
| 83-504B | 83-504B-72-3,142-144 | 847.9 | 21.9 | Euhedral laths of anhydrite, up to 0.45 - 1.0 mm, at the center of a clay mineral vein in a dark gray fine-grained host rock | Contains sphene + smectite with minor chlorite layers | |
| 83-504B | 83-504B-73-2,29-32 | 854.3 | Euhedral laths of anhydrite, up to 0.8 - 3.0 mm, occur in radial aggregates, sometimes with sparry calcite between the laths and both intergrown with clays at the center of a 1-cm-wide clay mineral vein in a dark gray host rock | Contains sphene + smectite with minor chlorite layers | ||
| 83-504B | 83-504B-74-1,46-49 | 862.0 | 21.4 | Anhydrite laths, up to 0.3 x 1.5 mm, at the center of a vein comprised of clay minerals, pyrite, and rimmed by quartz, in a light to dark gray, fine-grained host rock | Contains sphene + smectite with minor chlorite layers | |
| 83-504B | 83-504B-122-1,4-27 | 1213.6 | 21.5 | Anhydrite laths at the centers of veins of chlorite with minor smectite layers, in light greenish, fine-grained host rock | Contains greenschist and zeolite facies mineralogies | |
| 83-504B | 83-504B-139-1,29-33 | 1336.8 | Anhydrite and laumontite in mm-sized vein. Coarse-grained light greenish host basalt is extensively recrystallized. Anhydrite was not observed in thin section of this sample, so the relationship of the two minerals is unknown | Contains greenschist and zeolite facies mineralogies | ||
| 83-504B | 83-504B-141-1,58-61 | 1346.1 | 21.3 | Euhedral laths of anhydrite, up to 1- 5 mm, in 1-cm-wide vein with chlorite, epidote, laumontite, and prehnite, in light greenish host basalt that has been totally recrystallized to chlorite, albite, actinolite, and sphene | Anhydrite is partly replaced by laumonite, and both phases are partly replaced by prehnite | Contains greenschist and zeolite facies mineralogies |
| 83-504B | 83-504B-141-1,64-66 | 1346.2 | 21.2 | Anhydrite in veins and coating fractures on extensively altered light greenish basalt fragments. Chlorite preceded anhydrite deposition on exposed fracture surfaces | Contains greenschist and zeolite facies mineralogies |