Composition of drilled sediments and pore waters from the continental slope of the Northern Gulf of Mexico
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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1969
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| _version_ | 1867167661049249792 |
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| author | Manheim, Frank T Bischoff, James L |
| author_facet | Manheim, Frank T Bischoff, James L |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Pore waters were analyzed from 6 holes drilled from M.V. “Eureka” as a part of the Shell Oil Co. deeper offshore study. The holes were drilled in water depths of 600-3000 ft. (approximately 180-550 m) and penetrated up to 1000 ft. (300 m) of Pliocene-Recent clayey sediments. Salt and anhydrite caprock was encountered in one diapiric structure on the continental slope. Samples from holes drilled near diapiric structures showed systematic increases of pore-water salinity with depth, suggestive of salt diffusion from underlying salt plugs. Anomalous concentrations of K and Br indicate that at least one plug contains late-stage evaporite minerals. Salinities approaching halite saturation were observed. Samples from holes away from diapiric structures showed little change in pore-water chemistry, except for loss of SO4 and other variations attributable to early-stage diagenetic reactions with enclosing sediments. Thus, increased salt concentrations in even shallow sediments from this part of the Gulf appear to provide an indicator of salt masses at depth. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_711221 |
| institution | PANGAEA |
| language | en |
| publishDate | 1969 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Composition of drilled sediments and pore waters from the continental slope of the Northern Gulf of Mexico Manheim, Frank T Bischoff, James L Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Eu-26; Eu-66; Eu-70; Eu-79; Eu-80A; Eureka-65-67; Gulf of Mexico; MV Eureka; Ocean Drilling Program; ODP Pore waters were analyzed from 6 holes drilled from M.V. “Eureka” as a part of the Shell Oil Co. deeper offshore study. The holes were drilled in water depths of 600-3000 ft. (approximately 180-550 m) and penetrated up to 1000 ft. (300 m) of Pliocene-Recent clayey sediments. Salt and anhydrite caprock was encountered in one diapiric structure on the continental slope. Samples from holes drilled near diapiric structures showed systematic increases of pore-water salinity with depth, suggestive of salt diffusion from underlying salt plugs. Anomalous concentrations of K and Br indicate that at least one plug contains late-stage evaporite minerals. Salinities approaching halite saturation were observed. Samples from holes away from diapiric structures showed little change in pore-water chemistry, except for loss of SO4 and other variations attributable to early-stage diagenetic reactions with enclosing sediments. Thus, increased salt concentrations in even shallow sediments from this part of the Gulf appear to provide an indicator of salt masses at depth. |
| title | Composition of drilled sediments and pore waters from the continental slope of the Northern Gulf of Mexico |
| topic | Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Eu-26; Eu-66; Eu-70; Eu-79; Eu-80A; Eureka-65-67; Gulf of Mexico; MV Eureka; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.711221 |