Oxygen isotope composition, organic carbon content, and grain size distribution at the Peru upwelling region
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1990
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| _version_ | 1867171360403357696 |
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| author | Wefer, Gerold Heinze, Peter-M Suess, Erwin |
| author_facet | Wefer, Gerold Heinze, Peter-M Suess, Erwin |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A high-resolution chronostratigraphy was established for Holes 680B and 686B, drilled during Ocean Drilling Program (ODP) Leg 112 off Peru. The stratigraphy is largely based on oxygen isotopes of benthic foraminifers and supplemented by data for organic-carbon content and sediment texture. At both drill sites, during isotope Stage 1, the sedimentation rate was more than twice that of the older stages, which partly reflects lack of compaction in the youngest sediments. In Hole 680B, located at the center of a modern coastal upwelling cell in a water depth of 252.5 m, the mean sedimentation rate is 6.6 cm/k.y. in isotope Stages 1 through 15. Hole 686B lies at the fringe of another active upwelling cell off Capo Nazca in a water depth of 447 m. A prominent hiatus is evident between 105 and 120 m below seafloor (bsf). The mean sedimentation rate is 17.1 cm/k.y. above the hiatus (isotope Stages 1 through 15) and about 100 cm/k.y. below. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_753575 |
| institution | PANGAEA |
| language | en |
| publishDate | 1990 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Oxygen isotope composition, organic carbon content, and grain size distribution at the Peru upwelling region Wefer, Gerold Heinze, Peter-M Suess, Erwin 112-680B; 112-686B; 112-687A; DRILL; Drilling/drill rig; Joides Resolution; Leg112; Ocean Drilling Program; ODP; South Pacific Ocean A high-resolution chronostratigraphy was established for Holes 680B and 686B, drilled during Ocean Drilling Program (ODP) Leg 112 off Peru. The stratigraphy is largely based on oxygen isotopes of benthic foraminifers and supplemented by data for organic-carbon content and sediment texture. At both drill sites, during isotope Stage 1, the sedimentation rate was more than twice that of the older stages, which partly reflects lack of compaction in the youngest sediments. In Hole 680B, located at the center of a modern coastal upwelling cell in a water depth of 252.5 m, the mean sedimentation rate is 6.6 cm/k.y. in isotope Stages 1 through 15. Hole 686B lies at the fringe of another active upwelling cell off Capo Nazca in a water depth of 447 m. A prominent hiatus is evident between 105 and 120 m below seafloor (bsf). The mean sedimentation rate is 17.1 cm/k.y. above the hiatus (isotope Stages 1 through 15) and about 100 cm/k.y. below. |
| title | Oxygen isotope composition, organic carbon content, and grain size distribution at the Peru upwelling region |
| topic | 112-680B; 112-686B; 112-687A; DRILL; Drilling/drill rig; Joides Resolution; Leg112; Ocean Drilling Program; ODP; South Pacific Ocean |
| url | https://doi.org/10.1594/PANGAEA.753575 |