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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1985
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| Online Access: | https://doi.org/10.1594/PANGAEA.805001 |
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| _version_ | 1867169077651308544 |
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| author | Alt, Jeffrey C Saltzman, Eric S Price, David A |
| author_facet | Alt, Jeffrey C Saltzman, Eric S Price, David A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_805001 |
| institution | PANGAEA |
| language | en |
| publishDate | 1985 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Sulfur isotopes and description of anhydrite in DSDP Holes 70-504B and 83-504B Alt, Jeffrey C Saltzman, Eric S Price, David A 70-504B; 83-504B; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; Description 2 (continued); DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg70; Leg83; Mass spectrometer VG Micromass 602; Rock type; Sample code/label; δ34S 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. |
| title | (Table 1) Sulfur isotopes and description of anhydrite in DSDP Holes 70-504B and 83-504B |
| topic | 70-504B; 83-504B; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; Description 2 (continued); DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg70; Leg83; Mass spectrometer VG Micromass 602; Rock type; Sample code/label; δ34S |
| url | https://doi.org/10.1594/PANGAEA.805001 |